Speed Controller A speed controller is needed in conjunction with the surge control system. A new head-capacity curve is established for each speed, as shown…
Flare Valve As suction pressure increases or discharge pressure decreases, the compressor head requirement will decrease and the flow rate will increase. A flare valve…
A recycle valve is needed for surge control as well as for the conditions listed above for reciprocating compressors. At constant speed the head-capacity relationship…
Surge is the most important process design consideration for centrifugal compressors. The surge condition occurs when the compressor does not have enough flow to produce…
Each cylinder discharge line should have a relief valve located upstream of the cooler. Like all reciprocating devices, the piston will continue to increase pressure…
These valves isolate the compressor. Most operators require both shutdown valves to be automatic. Some operators use manual valves on small onshore compressors. If the…
A blowdown valve relieves trapped pressure when the compressor is shut down due to a malfunction or for maintenance. The flowsheet shows an automatic blowdown…
A speed controller can help extend the operating range and efficiency of the compressor. As the flow rate increases, the compressor speed can be increased…
A suction pressure throttling valve can also be installed to protect the compressor from too high a suction pressure. This is typically a butterfly valve…
As flow rate to the compressor increases, the suction pressure rises until the volume of gas at actual conditions of temperature and pressure compressed by…