AG Compressor: Industrial Air Solutions Experts in South Africa
Revolutionising operations across South Africa with reliable commercial and industrial compressed air systems since establishment. Your trusted partner for comprehensive air solutions.
Call +27 61 533 6352
Powering Industries with Reliable Compressed Air Solutions
AG Compressor stands as the pinnacle supplier of commercial and industrial compressed air equipment throughout South Africa. Operating as Castlehill Trading 159 CC, we've built our reputation on delivering exceptional service, quality products, and expert technical support to businesses across diverse industries.
Our comprehensive approach combines cutting-edge equipment supply with professional installation, routine maintenance, emergency repairs, and an extensive parts inventory. From compact 7.5kW units to powerful 250kW systems, we provide tailored compressed air solutions that keep your operations running smoothly.
Whether you require immediate rental equipment, scheduled maintenance programmes, or complete system installations, our experienced team delivers solutions that maximise uptime and operational efficiency. We partner with leading global manufacturers to ensure you receive world-class equipment backed by local expertise.
With rapid response times, competitive pricing, and a customer-first philosophy, AG Compressor has become the go-to provider for businesses demanding reliability in their compressed air systems.
Our Comprehensive Service Portfolio
Expert Repairs
Professional diagnostics and repair services for all major compressor brands. Our certified technicians resolve issues quickly, minimising downtime and restoring peak performance to your compressed air systems.
Preventative Maintenance
Scheduled maintenance programmes designed to prevent costly breakdowns. Regular servicing extends equipment lifespan, optimises energy efficiency, and ensures consistent air quality for your operations.
Professional Installations
Complete screw compressor setup ensuring optimal efficiency and safety compliance. From site assessment to commissioning, we handle every aspect of your compressed air system installation.
Parts & Accessories
Extensive inventory of high-quality OEM and aftermarket components for lasting performance. Fast parts availability keeps your systems operational and reduces waiting times for critical replacements.
Screw Compressor Rental Solutions
Flexible Rental Options for Every Requirement
AG Compressor now offers comprehensive screw compressor rental services ranging from 7.5kW to 250kW capacity. Whether you're managing planned maintenance shutdowns, handling emergency equipment failures, or scaling up for temporary project demands, our rental fleet provides immediate compressed air solutions.
Our rental programme includes delivery, installation, and ongoing technical support throughout the hire period. Each unit is meticulously maintained and tested before deployment, ensuring reliable performance from day one. Flexible rental terms accommodate both short-term emergency needs and extended project durations.
Rental Fleet Specifications
  • Capacity range: 7.5kW to 250kW
  • Modern, fuel-efficient models
  • Full technical support included
  • Rapid deployment available
  • Flexible hire periods
  • Professional installation service
Contact us today for competitive rental pricing and availability
Why Choose AG Compressor?
Technical Expertise
Our certified technicians possess extensive experience across all major compressor brands and applications. From automotive workshops to agricultural processing facilities, we understand the unique compressed air requirements of diverse industries and deliver solutions that work.
Rapid Response
Equipment downtime costs your business money. We prioritise emergency callouts and maintain comprehensive parts inventory for faster repairs. Many clients experience next-day installation and same-day service responses, minimising operational disruptions.
Quality Assurance
We exclusively supply equipment from reputable global manufacturers, ensuring reliability and longevity. Every installation meets stringent safety standards, and our maintenance programmes follow manufacturer specifications to protect your investment and maintain warranty coverage.
Customer-Focused Service
Your success drives our business. We provide honest assessments, transparent pricing, and practical solutions tailored to your operational requirements and budget. Our long-term client relationships testament to our commitment to excellence and reliability.
Trusted Industry Partnerships
AG Compressor collaborates with world-leading compressed air equipment manufacturers to deliver premium solutions to South African industries. Our partnerships ensure access to cutting-edge technology, reliable components, and comprehensive technical support.
These strategic alliances enable us to offer competitive pricing, genuine OEM parts, and factory-trained technical expertise. Whether you require standard equipment or specialised solutions, our manufacturer relationships ensure you receive the right product with full technical backing.
Client Success Stories
Andre Mostert
"Steven AG Compressors offers outstanding products and service. My business relies on machines that require a high standard of clean, dry compressed air, so a dependable compressor is crucial. I purchased my first compressor from them three years ago, and they've consistently provided excellent value along with professional, prompt support for scheduled maintenance and any issues that arise—keeping my operations running with minimal downtime."
"Recently, I urgently needed to upgrade to a larger compressor model. Steven offered me a great trade-in price on my old unit and had the new one installed the very next day. I cannot praise or recommend AG Compressors highly enough."
More Customer Testimonials
Wetpour Africa
"Excellent service and after service received from Steve. I highly recommend AG Compressor."
Warren Crooks
"Awesome experience with Steven and his guys. Very professional and great service."
Judy Parkins
"Brilliant efficient service. Thank you Steve and Kayla."
These testimonials reflect our commitment to exceeding client expectations through responsive service, technical excellence, and honest business practices. Your success is our priority.
Understanding Compressed Air Systems
What Is Compressed Air?
Compressed air is atmospheric air that has been pressurised to store potential energy. When released, this energy powers tools, machinery, and industrial processes. It's often called the "fourth utility" alongside electricity, water, and gas due to its essential role in modern manufacturing and processing.
Compressed air systems convert electrical or fuel energy into pneumatic power through compressors. The compressed air is then stored, treated, and distributed throughout facilities to power equipment ranging from simple hand tools to complex automated production lines.
Why Industries Rely on Compressed Air
Compressed air offers unique advantages: it's clean, safe, versatile, and easily controlled. Unlike hydraulic systems, air doesn't leak messy fluids. Unlike electric tools, pneumatic equipment operates safely in wet or explosive environments. The simplicity of pneumatic systems also means lower maintenance costs and longer equipment life.
Industries including automotive, food processing, pharmaceuticals, agriculture, manufacturing, and construction depend on reliable compressed air for daily operations. System failures directly impact productivity, making quality equipment and expert support essential.
Screw Compressor Technology Explained
How Rotary Screw Compressors Work
Rotary screw compressors utilise two intermeshing helical rotors (screws) to compress air. As the rotors turn, air is drawn in and progressively compressed as it moves along the screw threads towards the discharge port. This continuous process delivers smooth, pulsation-free compressed air at consistent pressure.
Unlike reciprocating piston compressors, screw compressors operate with fewer moving parts, generating less vibration and noise. They're designed for continuous duty cycles, making them ideal for industrial applications requiring constant compressed air supply. Modern screw compressors incorporate variable speed drives (VSD) that adjust motor speed to match air demand, significantly reducing energy consumption during partial load operation.
The oil-injected design most commonly used provides cooling, sealing, and lubrication simultaneously. The oil is separated from the compressed air before delivery, ensuring clean air output. Proper filtration and air treatment downstream ensure air quality meets specific application requirements.
Key Benefits of Screw Compressor Technology
Energy Efficiency
Modern screw compressors with variable speed technology adjust output to match demand, reducing energy waste. Efficient compression cycles and optimised thermal management lower operational costs significantly compared to older technologies.
Reliability & Durability
Fewer moving parts mean reduced wear and maintenance requirements. Quality screw compressors regularly achieve 40,000-60,000 operating hours between major overhauls, ensuring consistent performance and minimising downtime.
Continuous Operation
Designed for 100% duty cycle operation, screw compressors deliver uninterrupted compressed air supply. This makes them ideal for production facilities, processing plants, and applications where air supply interruption causes costly production stoppages.
Compact Footprint
Screw compressors deliver high output capacity relative to their physical size. This space efficiency proves valuable in facilities where floor space commands premium value, allowing more productive use of available area.
Air Dryer Systems: Essential for Quality Compressed Air
Why Air Treatment Matters
Atmospheric air contains water vapour that concentrates during compression. Without proper treatment, this moisture condenses within distribution systems, causing rust, corrosion, equipment damage, and product contamination. Air dryers remove moisture before it causes problems, protecting your investment and ensuring process quality.
Refrigerated Air Dryers
Refrigerated dryers cool compressed air to condense moisture, which is then separated and drained. They're cost-effective, reliable, and suitable for most general industrial applications requiring pressure dew points of +3°C to +10°C. Lower operating costs make them popular for standard compressed air applications.
Desiccant Air Dryers
Desiccant dryers use moisture-absorbing materials to achieve very low dew points (-40°C to -70°C). Essential for applications requiring extremely dry air—such as pharmaceutical production, electronics manufacturing, or outdoor installations in freezing conditions—they prevent any moisture-related issues.
Complete Air Treatment Solutions
Inlet Filtration
Removes particulates and contaminants from ambient air before compression, protecting compressor components and extending service life.
Compression
Screw compressor pressurises air to required operating pressure, generating heat that must be managed through cooling systems.
Aftercooling
Reduces compressed air temperature to condense initial moisture, improving dryer efficiency and protecting downstream equipment.
Air Drying
Removes remaining moisture to specified dew point, ensuring dry air reaches tools and processes.
Final Filtration
Multi-stage filters remove oil aerosols, particulates, and residual contaminants to deliver clean, dry compressed air meeting application requirements.
Industries We Serve
Automotive & Vehicle Maintenance
From tyre inflation to pneumatic tools, spray painting to lift operation, automotive facilities depend on clean, dry compressed air. We provide reliable systems that withstand demanding workshop environments.
Food & Beverage Processing
Food-grade compressed air applications require oil-free systems meeting strict hygiene standards. Our solutions ensure product safety whilst maintaining production efficiency in packaging, conveying, and processing operations.
Agricultural Processing
From grain handling to produce packaging, agricultural processors require robust compressed air systems that operate reliably in challenging environments. We supply equipment designed for the unique demands of agricultural applications.
Manufacturing & Production
Automated production lines, material handling systems, and pneumatic tooling all rely on consistent compressed air supply. We design systems that support your manufacturing processes with minimal downtime and maximum efficiency.
Additional Industry Applications
Construction & Civil Engineering
Portable and stationary compressors power pneumatic tools, concrete spraying equipment, and sandblasting operations on construction sites throughout South Africa.
Pharmaceutical & Healthcare
Ultra-clean, dry compressed air for medical devices, laboratory equipment, and pharmaceutical manufacturing processes where contamination prevention is critical.
Textiles & Garment Manufacturing
Compressed air powers weaving machinery, pneumatic conveyors, and automated handling systems in textile production facilities.
Woodworking & Furniture
Pneumatic sanders, nail guns, spray finishing equipment, and material handling systems all require reliable compressed air in woodworking operations.
Printing & Packaging
Compressed air operates printing presses, drives automated packaging machinery, and powers material handling systems throughout production workflows.
Mining & Mineral Processing
Robust compressed air systems for underground operations, surface processing plants, and maintenance facilities in demanding mining environments.
Preventative Maintenance Programmes
Protect Your Investment Through Regular Servicing
Compressed air systems represent significant capital investment. Regular maintenance extends equipment lifespan, prevents unexpected failures, maintains energy efficiency, and ensures consistent air quality. Our scheduled maintenance programmes are designed around manufacturer specifications and your operational requirements.
Standard Maintenance Includes:
  • Oil and filter replacements
  • Air/oil separator inspection
  • Belt tension checks and adjustment
  • Cooling system cleaning
  • Electrical connection inspection
  • Safety valve testing
  • Vibration and temperature monitoring
  • Leak detection and repair
  • Performance verification
Maintenance Programme Benefits
Scheduled servicing prevents 95% of compressor failures, significantly reducing emergency breakdowns and associated costs. Regular maintenance optimises energy consumption—dirty filters and worn components can increase energy use by 15-30%. Maintained systems also deliver consistent air quality, protecting downstream equipment and processes.
Our maintenance plans include priority service scheduling, detailed service records, and performance trending to identify potential issues before they cause failures. Predictive maintenance approaches save money and maximise uptime.
Comprehensive Repair Services
Expert Diagnostics and Rapid Resolution
Despite best maintenance efforts, equipment occasionally requires repairs. Our experienced technicians diagnose problems quickly and accurately, providing transparent assessments and competitive repair quotations. We maintain extensive parts inventory for faster repairs and reduced downtime.
01
Initial Assessment
Thorough diagnostic evaluation identifies root causes, not just symptoms. We use advanced diagnostic tools and decades of experience to pinpoint issues accurately.
02
Transparent Quotation
Detailed repair quotation outlining required work, parts costs, and labour. We explain the problem clearly and discuss options before proceeding with repairs.
03
Quality Repairs
Certified technicians perform repairs using genuine or high-quality aftermarket parts. All work follows manufacturer procedures and safety standards.
04
Performance Testing
Comprehensive testing verifies repairs restored proper function. We don't release equipment until it meets performance specifications.
05
Documentation & Follow-up
Detailed service documentation and recommendations for preventing recurrence. We follow up to ensure your satisfaction and continued reliable operation.
Professional Installation Services
Setting Up Your System for Success
Proper installation is critical to compressor performance, efficiency, and longevity. Our installation service encompasses site assessment, equipment positioning, electrical connections, piping configuration, and system commissioning. We ensure your compressed air system operates optimally from day one.
Site Assessment
We evaluate your facility to determine optimal compressor placement considering ventilation, ambient temperature, accessibility for maintenance, electrical supply, and compressed air distribution requirements. Proper siting prevents many common operational issues.
System Design
Piping layout design ensures efficient air distribution with minimal pressure drop. We calculate pipe sizing, recommend receiver tank capacity, specify filtration and treatment equipment, and design condensate management systems tailored to your application.
Professional Installation
Our certified installers handle all aspects: equipment positioning and securing, electrical connections meeting local codes, piping installation using appropriate materials, condensate drainage, safety device installation, and integration with existing systems where applicable.
Commissioning & Training
Before handover, we commission systems fully: leak testing, performance verification, safety checks, control system configuration, and operator training. We ensure your team understands basic operation, maintenance requirements, and troubleshooting procedures.
Extensive Parts & Accessories Inventory
Everything You Need to Keep Systems Running
AG Compressor maintains comprehensive inventory of genuine OEM parts and quality aftermarket alternatives. From routine maintenance items to major components, we stock what you need for faster repairs and reduced equipment downtime.
Maintenance Consumables
  • Compressor lubricating oils
  • Air filters and elements
  • Oil filters
  • Air/oil separators
  • Drain valves and kits
  • Drive belts
  • Gaskets and seals
System Components
  • Pressure switches and sensors
  • Safety and check valves
  • Pressure regulators
  • Air receivers and tanks
  • Dryers and dryer components
  • Filters and filter elements
  • Flexible hoses and couplings
Can't find what you need? We source specialised parts quickly through our manufacturer partnerships and extensive supplier network. Contact us with your requirements for availability and pricing.
Energy Efficiency and Cost Savings
Reducing Operating Costs Through Efficiency
Compressed air systems typically account for 10-30% of industrial electricity consumption. Optimising efficiency delivers substantial cost savings whilst reducing environmental impact. We help clients identify opportunities to reduce energy waste and implement solutions that lower operating costs.
30%
Average Energy Waste
Typical compressed air systems waste 20-30% of generated air through leaks, poor maintenance, and inefficient equipment.
£5000
Annual Leak Costs
A 3mm leak at 7 bar pressure costs approximately £5,000 annually in wasted electricity—easily prevented through regular leak detection.
35%
VSD Efficiency Gain
Variable Speed Drive compressors reduce energy consumption by 25-35% in applications with varying demand compared to fixed-speed units.
Practical Energy Saving Strategies
Regular Leak Detection and Repair
Systematic leak detection programmes identify and eliminate air losses. Even facilities with active leak management typically find 15-20% additional leaks during ultrasonic surveys. Quarterly leak audits deliver quick payback through reduced energy costs.
Optimise Operating Pressure
Every 1 bar reduction in system pressure reduces energy consumption by approximately 7%. Many facilities operate at unnecessarily high pressures—proper assessment often reveals opportunities to reduce pressure whilst still meeting application requirements.
Improve Air Treatment Efficiency
Dirty filters increase pressure drop, forcing compressors to work harder. Regular filter replacement and proper sizing ensures efficient operation. Similarly, optimised dryer operation prevents energy waste from over-drying air beyond application requirements.
Heat Recovery Systems
Compressors convert electrical energy to heat—typically 90% of input energy becomes waste heat. Heat recovery systems capture this thermal energy for space heating, process heating, or water heating, improving overall facility energy efficiency.
System Design Considerations
Building Efficient Compressed Air Infrastructure
Proper system design from the outset prevents operational issues and ensures efficient, reliable performance. Whether installing new systems or upgrading existing infrastructure, thoughtful design delivers long-term benefits.
Compressor Sizing
Right-sizing prevents efficiency losses from oversized units running in poor loading conditions or undersized equipment struggling to meet demand. We analyse your actual compressed air requirements—considering peak demand, average consumption, future growth, and diversity factors—to specify appropriate capacity.
Multiple smaller compressors often prove more efficient than single large units, providing redundancy, better part-load efficiency, and operational flexibility.
Distribution System Design
Piping design dramatically affects system efficiency. Undersized pipes create excessive pressure drops requiring higher compression pressures. We calculate proper pipe sizing, recommend loop configurations to minimise pressure drop, specify appropriate materials, and design condensate drainage to prevent moisture problems.
Strategic receiver tank placement stabilises pressure, reduces compressor cycling, and improves response to demand fluctuations.
Air Quality Standards and Requirements
Meeting Application-Specific Purity Needs
Compressed air quality requirements vary dramatically between applications. ISO 8573-1 defines compressed air quality classes for particles, water, and oil content. Understanding your requirements ensures appropriate equipment specification and prevents both over-specification (wasting money) and under-specification (risking product quality or equipment damage).
Food-Grade Air
Food and beverage applications require oil-free compressors or extensive filtration to achieve ISO Class 0 for oil aerosols. Bacterial contamination prevention may require sterile filtration. We specify appropriate equipment meeting food safety standards.
Pharmaceutical Grade
Pharmaceutical manufacturing demands extremely high air purity with comprehensive documentation and validation. We provide equipment meeting regulatory requirements including FDA, GMP, and European Pharmacopoeia standards.
General Industrial
Most manufacturing applications tolerate modest oil content but require adequate moisture removal and particulate filtration. Properly specified equipment balances air quality with cost-effectiveness for general industrial uses.
Common Compressed Air Problems and Solutions
Problem: Excessive Moisture
Symptoms: Water in airlines, rust in equipment, tool malfunctions, contaminated products
Solutions: Install or upgrade air dryer, improve aftercooler efficiency, repair condensate drains, add moisture separators at point-of-use
Problem: Insufficient Pressure
Symptoms: Tools underperforming, production slowdowns, equipment not operating properly
Solutions: Identify and repair leaks, clean/replace filters, check for pipe restrictions, verify adequate compressor capacity, reduce unnecessary demand
Problem: Excessive Oil Carryover
Symptoms: Oil in compressed air lines, product contamination, pneumatic equipment malfunctions
Solutions: Replace air/oil separator, service compressor, install coalescing filters, check oil level and quality, consider oil-free compressor for critical applications
Problem: High Operating Costs
Symptoms: Excessive electricity bills, frequent repairs, poor efficiency
Solutions: Implement leak detection programme, optimise operating pressure, upgrade to VSD compressor, improve heat recovery, establish preventative maintenance schedule
Compressor Control Systems
Optimising Performance Through Intelligent Control
Modern compressor control systems dramatically improve efficiency and reliability. Understanding available control methods helps optimise system performance for your specific demand profile.
1
Start/Stop Control
Basic control starts and stops compressor based on pressure. Simple and reliable but inefficient with frequent demand changes. Best for small compressors with infrequent operation.
2
Load/Unload Control
Compressor runs continuously, loading when pressure drops and unloading when satisfied. More efficient than start/stop but still consumes 15-35% power when unloaded. Common in industrial applications.
3
Variable Speed Drive
Motor speed varies to match air demand precisely. Achieves 25-35% energy savings in variable demand applications. Higher initial cost offset by operational savings. Increasingly popular for efficiency-focused facilities.
4
Sequencing Controllers
Intelligent controllers manage multiple compressors for optimal efficiency. They sequence units, balance run hours, and select most efficient combination for current demand. Essential for multi-compressor installations.
Safety Considerations
Protecting Personnel and Equipment
Compressed air systems contain significant stored energy requiring respect and proper safety protocols. We design and maintain systems meeting South African regulatory requirements and international safety standards.
Equipment Safety Features
  • Pressure relief valves prevent over-pressurisation
  • Safety shutdown systems protect against overheating
  • Electrical protection devices prevent damage
  • Emergency stop controls enable rapid shutdown
  • Guard covers protect moving components
  • Proper grounding prevents electrical hazards
Operational Safety Practices
  • Never direct compressed air towards people
  • Use appropriate personal protective equipment
  • Follow lockout/tagout procedures during maintenance
  • Ensure adequate ventilation in compressor rooms
  • Maintain clear access for emergency shutdown
  • Conduct regular safety inspections and testing
We provide comprehensive safety training for operators and maintenance personnel, covering proper equipment operation, routine inspection procedures, emergency response protocols, and regulatory compliance requirements.
Environmental Responsibility
Sustainable Compressed Air Solutions
AG Compressor recognises the environmental impact of industrial operations. We promote energy-efficient equipment, responsible practices, and technologies that reduce environmental footprint whilst improving operational economics.
Energy Conservation
Energy-efficient compressors and optimised systems reduce electricity consumption, lowering both operating costs and carbon emissions. We help clients achieve sustainability goals through equipment selection and operational improvements.
Proper Waste Management
Compressed air systems generate waste products including condensate (oil/water mixture) requiring proper disposal, used filters and separators, and spent lubricating oils. We advise on compliant disposal methods and environmentally responsible practices.
Waste Heat Recovery
Recovering compressor waste heat for facility heating or process applications improves overall energy efficiency. These systems reduce fossil fuel consumption whilst lowering compressed air costs—a genuine win-win for economics and environment.
Choosing the Right Compressor Size
Matching Capacity to Requirements
Compressor sizing requires careful analysis of actual air consumption, demand patterns, and future requirements. Undersized equipment struggles to meet demand, whilst oversized units operate inefficiently and cost more initially and operationally.
15%
Typical Diversity Factor
Connected load rarely operates simultaneously—typically 70-85% of installed pneumatic equipment runs at any time, allowing smaller compressor sizing than simple addition would suggest.
25%
Recommended Safety Margin
Specify 20-25% additional capacity beyond calculated demand to accommodate future growth, unexpected demand increases, and maintenance requirements without compromising operations.
40%
Peak Demand Buffer
Size receiver tanks and backup capacity to handle short-duration peak demands that exceed compressor output without requiring oversized primary compressor.
Our sizing service includes comprehensive air audit, demand pattern analysis, and recommendations ensuring optimal equipment selection. We consider both current requirements and anticipated growth to protect your investment.
Contact AG Compressor
Get Expert Compressed Air Solutions Today
Whether you require emergency repairs, new equipment installation, routine maintenance, or expert advice, AG Compressor delivers responsive, professional service throughout South Africa.
Our experienced team provides honest assessments, transparent pricing, and practical solutions tailored to your operational requirements and budget. We're committed to building long-term relationships through reliability, quality, and exceptional service.
Castlehill Trading 159 CC T/A AG Compressor
Telephone: +27 61 533 6352
Operating Hours: Monday-Friday 08:00-17:00
Emergency Service: Available for existing maintenance contract clients
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Service Areas and Coverage
Serving Businesses Throughout South Africa
AG Compressor provides compressed air solutions to businesses across South Africa. Our mobile service capability enables rapid response for installations, emergency repairs, and scheduled maintenance visits throughout our service area.
Primary service coverage includes major industrial centres and surrounding areas, with extended service available for specialised projects and maintenance contracts. Our strategic partnerships with equipment suppliers and service providers enable us to support clients nationwide when required.
Remote diagnostics capability allows us to troubleshoot many issues without site visits, providing faster resolution for electrical and control system problems. When on-site service is necessary, we schedule efficiently to minimise your downtime and our response times.
Frequently Asked Questions About Compressors
Q1: How often should I service my compressor?
Service intervals depend on operating hours and conditions. Typical recommendations include:
  • Light use (0-8 hours daily): Service every 2000 hours or annually
  • Normal use (8-16 hours daily): Service every 1000 hours or semi-annually
  • Heavy use (16-24 hours daily): Service every 500-750 hours or quarterly
Harsh environments (dusty, hot, humid) may require more frequent servicing. We recommend establishing preventative maintenance schedules based on your specific operating conditions to maximise reliability and efficiency.
Q2: What size compressor do I need?
Compressor sizing depends on several factors: total connected load (sum of all air-consuming equipment), diversity factor (what percentage operates simultaneously), duty cycle of equipment, required operating pressure, and future growth expectations.
As rough guidance, small workshops typically require 20-40 CFM (7.5-15kW), medium facilities need 40-100 CFM (15-37kW), and large operations demand 100+ CFM (37kW+). However, proper sizing requires detailed analysis—contact us for professional assessment ensuring you get the right capacity without overspending on excessive capacity.
More Compressor Questions Answered
Q3: Do I need an air dryer?
Most applications benefit from air dryers. Moisture in compressed air causes rust, corrosion, equipment malfunctions, contaminated products, and frozen airlines in cold weather. Applications particularly requiring dry air include spray painting, powder coating, instrumentation and controls, food processing, pharmaceutical manufacturing, and pneumatic tools.
The only applications potentially acceptable without dryers are basic applications tolerating moisture, extremely dry climates, or very short airline runs where moisture hasn't time to condense. Even then, dryers prevent problems and protect equipment investments.
Q4: Why is my compressed air bill so high?
High electricity costs typically result from:
  1. Air leaks: Often 20-30% of generated air escapes through leaks—the largest source of waste
  1. Excessive pressure: Operating higher than necessary—each 1 bar reduction saves ~7% energy
  1. Poor maintenance: Dirty filters, worn components, and inefficient operation increase consumption
  1. Inappropriate control: Older fixed-speed compressors waste energy compared to modern VSD units
  1. Inefficient uses: Using compressed air for applications better served by alternatives (cooling, cleaning)
A compressed air audit identifies specific opportunities to reduce costs. Many facilities reduce energy consumption 20-40% through proper leak management and operational improvements.
Technical Questions About Air Systems
Q5: What's the difference between screw and piston compressors?
Screw compressors use rotating helical screws for continuous compression. They're ideal for continuous duty, offer higher capacity in smaller footprint, operate more quietly, require less maintenance, and deliver pulsation-free air flow. Initial cost is higher but operational costs typically lower.
Piston compressors use reciprocating pistons similar to automotive engines. They're less expensive initially, suitable for intermittent use, available in very small sizes, deliver higher pressures, but require more maintenance, generate more vibration and noise, and aren't designed for continuous operation.
For industrial applications requiring continuous compressed air, screw compressors usually prove more economical over their lifetime despite higher initial investment.
Q6: Can I install a compressor myself?
Whilst mechanically capable individuals can install small compressors, professional installation ensures proper setup, safety compliance, optimal performance, and warranty protection. Considerations include:
  • Electrical work requires qualified electrician meeting local codes
  • Proper ventilation prevents overheating
  • Foundation/mounting affects vibration and noise
  • Piping design impacts efficiency and pressure drop
  • Condensate drainage requires proper configuration
  • Initial setup and commissioning ensures correct operation
Incorrect installation voids warranties, creates safety hazards, and causes premature failures. Professional installation costs typically represent small percentage of equipment investment whilst ensuring proper operation.
Operational Questions
Q7: How do I reduce compressed air costs?
Implement these proven strategies:
Fix air leaks
Conduct ultrasonic leak surveys quarterly. Tag and track leaks. Prioritise repairs by cost impact.
Optimise pressure
Reduce system pressure to minimum required. Even 0.5 bar reduction saves ~3% energy.
Maintain equipment
Follow service schedules. Replace filters on time. Keep cooling systems clean.
Use efficiently
Turn off equipment when not needed. Eliminate inappropriate uses. Optimise tooling.
Upgrade technology
Consider VSD compressors for variable demand. Install sequencing controls for multiple units.
Q8: What maintenance can I do myself?
Basic operator-level maintenance includes: daily drain condensate from receivers/dryers, weekly check oil level (oil-lubricated units), weekly inspect for leaks and unusual sounds, monthly clean intake air filters (or more frequently in dusty environments), and maintain service logs.
Professional servicing required for: oil changes and filter replacements, drive belt adjustment/replacement, air/oil separator replacement, safety valve testing, electrical system inspection, and performance verification. Attempting complex maintenance without proper training may void warranties and create safety hazards.
Equipment Selection Questions
Q9: Should I buy or rent a compressor?
Decision factors include usage duration, capital availability, and operational requirements:
Consider Purchasing When:
  • Long-term need (multiple years)
  • Continuous or frequent operation
  • Capital budget available
  • Fixed facility location
  • Specific configuration requirements
  • Building business asset value
Purchasing provides lowest long-term cost, asset ownership, tax depreciation benefits, and complete control over equipment specifications.
Consider Renting When:
  • Short-term projects (weeks/months)
  • Emergency backup during repairs
  • Testing before purchase commitment
  • Seasonal demand peaks
  • Limited capital availability
  • Temporary site locations
Renting offers flexibility, predictable monthly costs, no maintenance responsibility, and ability to scale capacity up/down as requirements change.
Q10: What's better—oil-lubricated or oil-free compressors?
Oil-lubricated compressors inject oil for cooling, sealing, and lubrication. They're more energy-efficient, cost less initially, tolerate harsher conditions, and suit general industrial applications. However, they require downstream filtration for critical applications and regular oil maintenance.
Oil-free compressors use alternative technologies (water lubrication, dry screws, or special coatings) eliminating oil carryover risk. Essential for food, pharmaceutical, electronics, and other contamination-sensitive applications. They cost more initially, typically consume slightly more energy, but eliminate oil-related maintenance and provide guaranteed oil-free air.
Choose based on application requirements: oil-free for sensitive processes, oil-lubricated with proper filtration for general industrial use where air quality standards permit.
About Castlehill Trading 159 CC
Your Trusted Compressed Air Partner
Castlehill Trading 159 CC, trading as AG Compressor, has established itself as a leading compressed air solutions provider throughout South Africa. Founded on principles of technical excellence, honest business practices, and customer-focused service, we've built lasting relationships with clients across diverse industries.
Our success stems from combining technical expertise with genuine commitment to client success. Unlike suppliers focused purely on equipment sales, we approach compressed air as an essential utility requiring proper specification, professional installation, and ongoing support. This comprehensive approach ensures our clients receive maximum value from their compressed air investments.
Our team brings decades of combined experience in compressed air technology, industrial maintenance, and customer service. We stay current with evolving technologies, energy efficiency standards, and industry best practices through ongoing training and manufacturer partnerships. This expertise enables us to provide informed recommendations and professional service across all aspects of compressed air systems.
Our Installation Gallery
Browse examples of our professional installations across various industries and applications. Each project demonstrates our commitment to quality workmanship, attention to detail, and customer satisfaction.
Visit our About Us, FAQ's and Installation Gallery page to view additional installation examples and learn more about our services.
Parts and Accessories Showcase
Browse Our Extensive Product Range
AG Compressor maintains comprehensive inventory of compressed air system components, consumables, and accessories. Our online parts showcase enables convenient browsing of available products, specifications, and pricing.
Browse Products
Visit our Parts and Accessories Showcase to explore available items, detailed specifications, and current pricing.
Contact for Orders
Call +27 61 533 6352 to place orders, verify availability, or discuss specific requirements with our knowledgeable staff.
Fast Delivery
We offer prompt delivery throughout our service area or convenient collection from our facility for urgent requirements.
Can't find specific parts in our online showcase? Contact us directly—we source specialised components through our extensive manufacturer and supplier network.
Educational Resources and Blog
Stay Informed About Compressed Air Technology
AG Compressor provides valuable educational content covering compressed air systems, maintenance best practices, energy efficiency strategies, troubleshooting guidance, and industry updates. Our blog features practical information helping facility managers and maintenance professionals optimise their compressed air operations.
Topics covered include equipment selection guidance, maintenance schedules and procedures, energy efficiency improvement strategies, troubleshooting common problems, industry news and technology updates, case studies and application examples, and regulatory compliance information.
Visit our comprehensive blog archive to access articles, technical guides, and helpful resources. New content is added regularly covering relevant topics for compressed air system users.
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Get Started with AG Compressor Today
Ready to Optimise Your Compressed Air Systems?
Whether you're planning new installations, need emergency repairs, want to establish preventative maintenance, or simply have questions about compressed air technology, AG Compressor provides expert guidance and professional service.
Our experienced team is ready to discuss your requirements, assess your current systems, and recommend cost-effective solutions that improve reliability, efficiency, and performance.
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Contact Information
Castlehill Trading 159 CC T/A AG Compressor
Hours: Monday-Friday 08:00-17:00
Connect with us: Facebook
Powering South African industries with reliable compressed air solutions. Your success is our mission.