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- Frequently Asked Questions
FREQUENTLY ASKED QUESTIONS
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What Is The Difference Between A Screw, Vane And Piston Compressor?
The rotary screw air compressor is probably the most common type of air compressor today. A male and a female screw move towards each other while the volume between them and the housing decreases. The pressure ratio of a screw is dependent on the length and profile of the screw and of the form of the discharge port. The quietest style of air compressor, the maximum pressure achievable from a screw air compressor is 13 bar (188psi). Direct Air & Pipework are distributors of both CompAir and Boge Screw air compressors and can offer both oil lubricated or oil free machines.
A Vane air compressor is driven at very low speed and is favored for its outstanding reliability. The rotor rotates within a cylindrical stator and is the only continually moving part. The rotor is offset and uses centrifugal force to extend the vanes from their slots forming compression cells. Oil is used to lubricate and seal the cells as they decrease in volume, compressing the air. Direct Air & Pipework supply the popular and reliable Hydrovane air compressor in a range from 1.1kW to 75kW.
One of the earliest compressor designs, the versatility of the piston compressor allows it to change from compressing both air and gases with very few alterations. Piston compressors are normally quite loud and through multi staging can reach incredibly high pressures for applications such as breathing air.
What Is The Most Energy Efficient Air Compressor?
The most energy efficient air compressor really depends upon the application it is used for. It is widely recommended that when thinking about compressed air energy efficiency you should conduct an energy audit to measure your current usage and identify areas where you could make effective cost saving changes. Direct Air & Pipework are able to perform compressed air energy audits using the latest technology and with our extensive knowledge and experience can recommend and implement the best solution tailored to your needs.
What Is The Quietest Air Compressor
The quietest type of air compressor is a screw air compressor. Direct Air supply the Boge S-3 range which offers the same quality and reliability expected of Boge while also being one of the quietest on the market today.
How Long Are Your Compressors Under Warranty?
Subject to maintaining the recommended service and maintenance schedule most new CompAir air compressors are under warranty for up to 6 years under the CompAir assure warranty, most Hydrovane air compressors are under warranty up to 10 years and most Boge air compressors up to 5 years
To discuss the exact warranty details on the air compressor you are thinking of purchasing contact us
Do You Provide Installation?
All air compressor installation work is carried out by our own fully skilled direct labour force in compliance with current approved codes of practice and pressure systems regulations.
Our installations department are fully conversant with compressed air and all cooling and chilled water system requirements.
Our ability to provide a total system solution and turnkey packages while maintaining control over the project from start through to final completion ensures that the air compressor installation system is correct from design to commissioning.
Direct Air are also experienced in helping companies relocate making sure you have a smooth transition from site to site. To discuss your installation requirements contact us today.
Do You Offer Finance Options On Buying New Equipment?
Yes, Finance options are available in certain circumstances when buying new compressed air equipment (subject to a credit check).
If you require a finance arrangement to help with your planned purchase contact us to see how we can help.
What Maintenance/Servicing Options Do You Provide?
At Direct Air we offer a full range of air compressor and air treatment servicing options to meet your sites requirements.Direct Air provide air compressor service packages ranging from a basic service to comprehensive 24 hour monitoring of your compressor system.
We are dedicated to ensuring that we can meet all your needs to keep your production running in the most effective and efficient manner possible.
How Can I Get A Better Quality Of Air?
For your Filtration and Moisture Removal needs Direct Air can advise on a complete range of compressed air treatment products to meet the requirement of your application including: Filtration, Compressed Air Dryers, Condensate Management and Nitrogen Generation.
ISO 8573 Table
Solid Particles, Particle Size, d (mm)
Humidity & Liquid Water
Pressure Dew Point
Total Concentration: Aerosol, Liquid, Vapour
Maximum number of particles per m³
Liquid water content
Cw ≤ 0.5
0.5 > Cw ≤ 5
5 < Cw ≤ 10
Why Do I Get Water In My Air Lines?
The most common cause of water in air lines generates from either a faulty or inadequate air dryer. Direct Air have extensive knowledge and experience with refrigerant, desiccant and membrane dryers and have specialist refrigerant engineers who can diagnose and quickly repair a range of common issues.
To discuss your problem further and arrange for an engineer to visit your site, contact us today.
How Do I Dispose Of Condensate From My Compressed Air System Legally?
What Areas Of The Country Do You Cover?
Direct Air & Pipework cover sites all over the UK and conduct work in some European countries too. you can view the areas in the UK we cover on our locations page
How Long Can I Hire A Compressor For?
Direct Air can offer both short and long term hire arrangements ranging from 1 week to 10 years.