2.3 COMPRESSORS WITH BELL CASINGS

 2.3.1 BCL Compressors with Bell Casings

Barrel compressors for high pressures have bell-shaped casings and are closed with shear rings instead of bolts (see figure 2.9).

2.3.2 PCL Compressors

These have bell—shaped casings with a single vertical end cover instead of two as in BCL compressors. They are generally used for natural gas transportation (see figure. 2.10). They normally have side suction and delivery nozzles positioned opposite each other to facilitate installation on gas pipelines.

2.4 SR COMPRESSORS

These compressors are suitable for relatively low pressure services. They have the feature of having several shafts with overhung impellers. The impellers are normally open type, i.e., shroudless, to achieve high tip speeds with low stress levels and high pressure ratios per stage. Each impeller inlet is coaxial whereas the outlet is tangential. These compressors are generally employed for air or steam compression, geothermal applications etc. (see figure. 2.11).

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