Compressor suction temperature

Lube Oil Temperature Gauqe Compressor Suction Pressure Gauge Compressor Suction Temperature Gauge Compressor Discharge Pressure Gauge Compressor Discharge Temperature Gauge... 

On-off two-position with differential gap Slow Any Any Large-capacity temperature and level installations. Storage tanks, hot-water supply tanks, room heating, compressor suction scmbber... 

One compressor has two different suction temperatures (stages) and a second compressor has one. Both compressors discharge to same condenser. 

Brake horsepower per 1 million ft /day measured at 14.7 psia and suction temperature using 75% overall compressor efficiency is given in Figure 12-68, and a volume correction factor is shown in Figure 12-69. 

Figure 12-69. Correction factor for compressor bhp/million ft per day at 14.7 psia and suction temperature versus suction volume. (Used by permission Dresser-Rand Company.)...

Material Capacity Suction pressure Suction temperature Discharge pressure Discharge temperature Compressor speed Single-cylinder, double-acting... 

Pressure drops on the high-pressure side will be small enough to have little effect on the performance of the complete system. Pressure losses in the suction pipe and its fittings, especially if this is long, should be checked, and a correction made for the actual compressor suction pressure. For low-temperature applications, pipe sizes may have to be increased to avoid excessive frictional losses at these low pressures. 

Refrigerant pressures and temperatures at expansion valve inlet, evaporator outlet, and compressor suction and discharge... 

Compressor suction and discharge pressures and corresponding temperatures. 

Natural gas (CH4) is transported through a 6 in. ID pipeline at a rate of 10,000 scfm. The compressor stations are 150 mi apart, and the compressor suction pressure is to be maintained at lOpsig above that at which choked flow would occur in the pipeline. The compressors are each two stage, operate adiabatically with interstage cooling to 70°F, and have an efficiency of 60%. If the pipeline temperature is 70°F, calculate ... 

A natural gas pipeline (primarily CH4) is supplied by a compressor. The compressor suction pressure is 20psig, and the discharge pressure is 1000 psig. The pipe is 5 in. sch 40, and the ambient temperature is 80°F. 

The system shown in Fig. 22.1 has no provision for controlling the evaporator temperature this is controlled solely by the compressor suction pressure. The lower the compressor suction pressure, the lower the evaporator temperature. This is exactly how our home air conditioner works. If the evaporator temperature is too cold, what can we do Well, if this were a steam turbine compressor, gas engine drive, or any other type of variable-speed driver, we could reduce the compressor s speed. This would reduce the flow of refrigerant, and raise both the evaporator and compressor suction pressure. 

Spillback bypasses the compressor discharge gas, back to the compressor suction. This is a relatively energy-inefficient way to increase the evaporator temperature. Spillback is discussed in Chap. 28, Centrifugal Compressors and Surge. ... 

This discussion assumes that the compressor s suction pressure is fixed. However, in the real world, this is rarely the case. As we lower the compressor discharge pressure, the compressor suction pressure will also decrease. This will have the normally beneficial effect of reducing the evaporator pressure and temperature. 

This simplified version assumes that K (the Cp/Cv ratio) is a constant of 1.3 that Tv the suction temperature, is constant and that the compression work is proportional to the motor amps (N is the number of moles of gas flowing into the compressor). From Eq. (28.2), it is obvious... 

Throughout our discussion of motor-driven, constant-speed centrifugal compressors, I have assumed that the suction temperature was constant. But let s refer back to Fig. 28.1. Assume that the temperature in the drum increases. How will this affect the pressure in the drum ... 

On the other hand, a high compressor discharge temperature may be due to a larger compression ratio. The compression ratio is the discharge pressure P2 divided by the suction pressure Py Both P] and P2 are expressed in psia (not in psig). 

In a single-stage compressor Suction pressure = 101.3 kN/m2. Suction temperature = 283 K. Final pressure = 380 kN/m2. If each new charge is heated 18 deg K by contact with the clearance gases, calculate the maximum temperature attained in the cylinder. 

What-if" planning is very important. The compressor performance should be examined for a range of pressures around the intended suction pressure. Turndown is extremely important since predicting the acid gas volumes can at times be very difficult. In this respect, one needs to consider speed changes (minimum and maximum), compressor internal temperatures with volume pockets in operation, and possible gas recycle. 

Temperature chiller. If refrigerant temperature is high and approach temperature on chiller is normal, check 1. Chiller pressure. bypass. 3. Compressor valve failure. 4. Compressor suction pressure restriction. 5. Low compressor speed. 

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