What is the max permissible compressor discharge temperature as per API 618?

In hydrogen rich applications, API 618 (1995) limits discharge temperatures to 275F (135C). For natural gas service the maximum discharge temperature limit is 350F (175C); although in most cases a more practical limit is 300F (149C). Air compressors may run at discharge temperatures in excess of 400F (204C).

What is pulsation study?

Pulsation analysis is the study and control of acoustic resonances in gas pipe systems caused by strong harmonic forcing from reciprocating gas compressors.

Can surge happen in reciprocating compressors?

Surging is not witnessed in Reciprocating Compressors, as they are positive displacement Equipments where the pressure increased is by volume reduction, hence providing anti surge in reciprocating is not envisaged and not proper.

What is the latest edition of API 618?

API 618 5th Edition
The new API 618 5th Edition includes many improve- ments over the 4th Edition in the specification for engi- neering studies to minimize pulsation and vibration. These new specifications have an impact on packagers and owners.

What is high discharge temperature?

High discharge temperature is the result of temperatures in the compressor head and cylinders becoming so hot that the oil loses its ability to lubricate properly. This causes rings, pistons and cylinders to wear resulting in blow by, leaking valves, and metal debris in the oil.

What is pulsation effect?

Description: The pulsate effect hides or shows an element by pulsing it in or out.

What is vibration in compressor?

Vibration can be caused by a variety of conditions including bent shafts, unbalance in rotating parts, worn or bent gears, damaged bearings, misaligned couplings or bearings, electromagnetic forces, etc. In compressors, however, the most common causes are unbalance in rotating parts and abnormal aerodynamic forces.

What is the suction pressure of R32?

R32’s pressure ratio is a little higher than R410A. The isentropic exponent affects the pressure ratio and the discharge temperature. The working (operating) pressure of R32 is about 12 – 26 Bar (174-377 Psi).

Can low refrigerant cause high discharge temperature?

LOW EVAPORATOR PRESSURES AND TEMPS. Low evaporator pressures also may cause a high compressor discharge temperature. When evaporator pressures are low, the compressor must compress refrigerant from this lower evaporator pressure to the condensing temperature.