What is the purpose of a suction drum?

Most compressors have suction drums or knockout pots upstream for protection against liquid slugs entering the compressor feed. The droplet size being removed rarely is explicitly stated.

Why is intercooler used between stages?

Intercoolers are generally used between the stages to reduce the power requirements as well as to lower the gas temperature that may become undesirably high.

What is the purpose of intercooling in multistage compressor?

Functions of Intercoolers The air compressor intercooler’s main function is to cool air before it enters the next stage of compression. The higher density of cool air makes it easier to compress than hot air.

What is knockout drum?

The Knock out drum is a vessel in the flare header designed to remove & accumulate condensed & entrained liquids from the relief gases. Vertical knockout drums are typically used if the liquid load is low or limited plot space is available. They are well suited for incorporating into the base of the flare stack.

What is suction KOD?

Centrifugal compressor suction KOD is intended for removing the entrained liquids before sending gas to the compressor. Demister, mesh pad etc. are used in the knock out drum to efficiently remove the liquid droplets. Compressor aftercoolers are generally air coolers and the related fan, motor etc.

What are the advantages of using intercooler in multi stage reciprocating compressor?

The multistage compressor with intercooler in-between is shown in Figure . It is used to reduce the temperature of compressed air during the compression stages. The inter-cooling reduces the volume of air which used to increase due to heat.

What is used as intercooler in multistage compression of VCR system?

Intercooling of the vapour may be achieved by using either a water-cooled heat exchanger or by the refrigerant in the flash tank. Moreover, with water cooling the refrigerant at the inlet to the high stage compressor may not be saturated. Water cooling is commonly used in air compressors.

Why does multistage compression with intercooling decrease the compressor power?

It can be seen that intercooling is done at constant pressure and is represented by a horizontal line on the P-V diagram. By multi staging, the pressure ratio of each stage is lowered. Thus, the air leakage past the piston in the cylinder is also reduced.

Why is multistage compression with intercooling adapted?

Advantages of multi-stage compressor over single stage compressor. -The fluid can be compressed to very high pressure. – The intercooler is more efficient than the cylinder wall cooling in a single stage compressor. -Pressure ratio per each stage is lowered and it reduces the leakage loss.

What is gas knockout drum?

The Knock out drum is a vessel in the flare header system designed to remove & accumulate condensed & entrained liquids from the relief gases. Both the horizontal & vertical design is a common consideration for the Knock out drum, which is determined based on the operating parameters as well as other plant conditions.

What is KOD in compressor?

Presence of small liquid droplets in the gas compressor can be damaging to the compressor. Hence Knock Out Drums (KOD) at compressor suction are desirable to remove even small traces of liquid droplets from gas going to the compressor. These are known as compressor aftercoolers.