2. NUOVO PIGNONE'S RANGE OF CENTRIFUGAL COMPRESSORS

The centrifugal compressors manufactured by Nuovo Pignone have different configurations to suit specific services and pressure ratings. They may be classified as follows:

2.1 COMPRESSORS WITH HORIZONTALLY - SPLIT CASINGS

Horizontally-split casings consisting of half casings joined along the horizontal center-line (figure. 2.1) are employed for operating pressures below 60 bars.

 The suction and delivery nozzles as well as any side stream nozzles, lube oil pipes and all other comressor—plant connections are located in the lower casing. With this arrangement all that is necessary to raise the upper casing and gain access to all internal components, such as the rotor, diaphragms and labyrinth seals is to remove the cover bolts along the horizontal center—line.

The horizontally-split casing compressors are in dicated by the letter designation MCL and may be further identified according to the number of stages.

2.1.1 MCL Compressors

These multistage compressors (see figure. 2.2) have one compression stage only.

2 .1 . 2 ZMCL Compressors

These are multistage compressors (see figure. 2.3) which group two compression stages in series in the same machine with interstage cooling.

 2.1.3 3MCL Compressors

These are multistage compressors which generally in corporate more than two compression stages in a single casing (see figure. 2.4). As a rule they are used in services where different gas flows have to be cog pressed to various pressure levels, i.e. by injecting and/or extracting gas during compression.

2.1.4 DMCL Comgressors

Two compression stages are arranged in parallel in a single casing. The fact both stages are identical and the delivery nozzle is positioned in the center of the casing makes this solution the most balanced possible.

Moreover, a double flow is created by a common central impeller (see figure. 2.5)

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