Major Types Of Reciprocating Compressor Distance Piece
What is distance Piece?
The distance piece provides separation between the reciprocatory mechanical device cylinder and also the mechanical device frame. Distance items may be either a single- or double-compartment arrangement. within the single-compartment style, the area between the cylinder packing and also the diaphragm is long so no a part of the rod enters each the housing and cylinder packing box.
Oil migrates between the cylinder and also the housing. If oil contamination may be a concern, Associate in Nursing oil thrower may be provided to forestall packing lubricate oil from getting into the mechanical device frame.
For unhealthful service, a two-compartment style is also used. No part of the connecting rod enters each of the housing and also the compartment adjacent to the gas cylinder.
Four Major forms of reciprocatory mechanical device Distance items As per API 618, the gap items square measure classified as four sorts, they are
Type A
Type B
Type C
Type D
Type A
Four Major forms of reciprocatory mechanical device Distance items
This type of distance piece is a brief length, a single-compartment distance piece. These sorts square measure chiefly used for lubricated service once oil carryover is appropriate. Usually, the oil carry-over is at the wiper packing and cylinder pressure packing.
In this reciprocatory mechanical device, a part of the connecting rod could alternately enter the housing (crosshead housing) and also the gas cylinder pressure packing. This arrangement shall not be used once cylinders square measure lubricated with artificial oils.
Distance items square measure used for
- Nonflammable or non-hazardous gases application
- Oil carry-over by the gases is appropriate within the method application.
Type B
Four Major forms of reciprocatory mechanical device Distance items
The Type B distance piece is a Long, single-compartment distance piece. These sorts square measure used for non-lubricated service or for lubricated service wherever oil carryover isn’t acceptable within the method gas.
No part of the connecting rod shall alternately enter the housing (crosshead housing) and also the gas cylinder pressure packing.
Normally the connecting rod is fitted with Associate in Nursing oil thrower of spark resistant material. The oil thrower is ideally a split style for straightforward access to the piston packing.
Type C
Four Major forms of reciprocatory mechanical device Distance items
The Type C distance piece consisting of 2 compartments. each the compartments square measure the Long/long sort. This kind of distance piece designed for the applying of ignitable, hazardous, or unhealthful gases.
No part of the connecting rod shall alternately enter the wiper packing, intermediate partition packing, and also the cylinder pressure packing.
In this kind of reciprocatory mechanical device distance piece, segmental packing shall be provided between the 2 compartments. rely on the applying, a provision for lubrication the segmental packing is provided within the distance piece.
In this kind of distance piece, a provision for buffer gas injection is provided. it’s to forestall the gas leak within the atmosphere.
The Type C distance piece ordinarily incorporates 2 oil slingers. One in every compartment isn’t ordinarily employed in method compressors. this kind of distance piece is employed just for special services like chemical element service.
Disadvantages:
This distance piece style causes the general length of the gas finish assembly to become too massive. therefore inflicting the general dimension of the reciprocatory compressors to become massive, and so increasing foundation necessities.
Distance Piece will cause connecting rod diameters to extend attributable to the column result of too long piston rods.
Type D
Four Major forms of reciprocatory mechanical device Distance items
The type D distance piece incorporates 2 compartments, the same as sort C. the sole distinction is one amongst the compartment is brief and another one is long. this kind of distance piece is intended to contain ignitable, hazardous, or unhealthful compressed gases leak into the atmosphere.
No part of the connecting rod shall alternately enter the wiper packing and also the intermediate partition packing. Segmental packing is provided between the 2 compartments for straightforward installation and maintenance.
Rely on the applying, a provision for lubrication of the segmental packing is provided within the distance piece. Also, a buffer gas provision is provided within the distance piece to contain the gas leak into the atmosphere.
Normally the supply for buffer gas demand and sort of buffer gas is nominative to mechanical device manufacturer by the purchesr
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