Remanufactured Compressors – The benefits
Here we explain to you what a remanufactured compressor is, how it can benefit you and what different types and brands are available. If you have a question that we haven’t answered to your satisfaction, please don’t hesitate to ask us.
What is a Remanufactured Compressor?
A remanufactured compressor is a compressor that has been stripped down to its component parts, cleaned, machined where necessary, new parts supplied and rebuilt to the original manufacturer’s standard.
You’ll find that the cost of this is far less than buying a new compressor and yet you can still enjoy the benefit of many years of excellent service. At PCE all of our remanufactured compressors carry the same one year warranty as the original equipment.
We have an excellent range of remanufactured compressors ready to exchange, or you can ask us to remanufacture your own compressor. The choice is yours.
What different types of remanufactured compressor do you get?
Power Compressor Exchange remanufactures many different types of compressors. Some of the more common mechanical compressors are Screw, Reciprocating and Centrifugal. These can be powered by electric motors, steam turbines or gas turbines. They can be either hermetic (welded closed) or semi-hermetic (bolted together).
Screw compressors - engineered for performance
The easiest way to understand how a screw compressor works is to imagine that you’re drilling through a piece of wood with a household drill. A thin spiral of wood is drawn through the grooves of the drill - pulled from within the wood and moved out towards the base of the drill bit.
Screw compressors work in basically the same way but use two interlocking screws for greater efficiency. Instead of channelling wood along their grooves, these screws (or rotors) move gas through the compressor, creating the pressure needed.
In a typical screw compressor there are two screws (male & female) that are fitted together in stationary housing. As the rotors rotate, the gas is compressed by direct volume reduction between the two rotors. You do also get single screw compressors which rely on a single rotating screw passing through two star wheels to provide the compression.
These compressors are semi-hermetically (bolted together), allowing easier repair work to be carried out.
Benefits of a screw compressor
The screw compressor’s smooth, consistent motion eliminates the pulsing and high-impact vibration found in piston-driven compressors. This results in quieter operation and less chance of surges in the system.
Due to this smooth operation, screw compressors tend to be less prone to energy loss. In addition, their stable output leads to greater energy efficiency for the system as a whole. This is especially beneficial for larger systems.
Over time, screw compressors have become easier to produce, helping to bring the price down. This lower cost, combined with increased energy efficiency, makes them a popular choice among industrial and large application buyers.
Remanufactured screw compressors
The tight tolerances involved in screw compressors make them difficult to remanufacture correctly. Power Compressor Exchange is an industry leader in remanufacturing screw compressors.
Our skilled PCE technicians work with great care, especially with rotor pairs, as any deviation outside the tolerance will cause the compressor to fail. Each make and model of screw compressor has its own set of specs which must be met in order to function properly. We make sure these standards are met.
Reciprocating compressors use pistons driven by a crankshaft. They can be either stationary or portable, can be single or multi-staged, and can be driven by electric motors or internal combustion engines.
A reciprocating compressor is used to deliver a small volume of refrigerant at a very high pressure. It is usually a semi-hermetic compressor which simply means that it can be serviced easily because the casing is bolted together rather than welded.
Small reciprocating compressors are common in automotive applications, usually used for intermittent duty. Household, home workshop and smaller job site compressors are most often reciprocating compressors with an attached receiver tank.
Larger reciprocating compressors (over 750 kW) are found in industrial and petroleum applications. Discharge pressures can range from low to very high.
In certain applications (such as air compression), multi-stage, double-acting compressors are probably the most efficient. They are typically larger and cost more than comparable rotary units.
The centrifugal compressor achieves compression by applying centrifugal force to an air mass. It uses a rotating disc to force the gas to the rim of the impeller, increasing the velocity of the gas. A diffuser (divergent duct) section converts the velocity energy to pressure energy.
The few moving parts in a centrifugal compressor make it popular in the industry. It is also very energy efficient and delivers a higher refrigerant flow than a reciprocating compressor of similar size. It is hermetically sealed in a single piece welded steel casing which cannot be opened for repair.
Centrifugal compressors are more suited to higher volume but low pressure applications - such as those that use ventilation fans, cooling units and air movers.
These compressors are used mainly for continuous, stationary service in industries such as oil refineries, chemical and petrochemical plants and natural gas processing plants. Their application can be from 75 kW upwards. With multiple staging, they can achieve exceptionally high output pressures.
Many large ski resorts use centrifugal compressors to make snow. They are also used in internal combustion engines as superchargers and turbochargers, as well as in small gas turbine engines or in the final compression stage of medium sized gas turbines.
Well-known Compressor Brands
At Power Compressor Exchange we are able to supply and install the following major brands of remanufactured compressor: