Gasmizer Manual - Submarine Manufacturing and Products Ltd
Gasmizer Manual - Submarine Manufacturing and Products Ltd
Gasmizer Manual - Submarine Manufacturing and Products Ltd
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March 2009<br />
Guide Ring Axial Thickness<br />
Guide Ring<br />
Groove Width<br />
0.362” (9.195mm) NOMINAL<br />
MAXIMIMUM TOTAL CLEARANCE: 0.015” (0.381mm)<br />
0.375” (9.525mm)<br />
0.3134” (7.96mm)<br />
NOTE<br />
Check when cold<br />
When fitting new guide rings <strong>and</strong> piston rings the cylinder bore must be roughened to<br />
enable the new rings to ‘bed in’. Use 200 grit emery cloth to impart a 45 o crosshatch<br />
type finish to the swept area of the cylinder bore.<br />
Wash out all traces of abrasive material with a suitable solvent.<br />
NOTE<br />
Failure to roughen the cylinder bore will cause premature wear of the piston <strong>and</strong> guide rings due<br />
to excessive cylinder bore temperatures.<br />
Re-assembly:<br />
Re-assemble in the reverse order to the procedure in 9.9.3.2.<br />
The torque settings are:<br />
Piston bolt<br />
Water manifold studs<br />
Water Manifold nuts<br />
30 ft-lbs (22Nm)<br />
13 ft-lbs (9.6 Nm)<br />
10 ft-lbs (7.4Nm)<br />
9.9.5 Pressure Packing Unit<br />
Description:<br />
The piston rods run in oil free self compensating high pressure packing which<br />
effectively seal the gas end from the oil lubricated crankcase assembly, <strong>and</strong><br />
additionally dissipate excess heat from friction <strong>and</strong> compression pressure. The<br />
packings are internally water cooled for optimum efficiency.<br />
Disassembly:<br />
1. Loosen <strong>and</strong> remove nuts from tie-studs.<br />
2. Withdraw case <strong>and</strong> containers. As containers are removed the packing rings will<br />
be exposed. Ensure each set of segments <strong>and</strong> rings are kept together as a set as they<br />
must be re-assembles in the same position as they came out.<br />
3. Separate packing ring segments by removing garter springs.<br />
Maintenance:<br />
1. Apart from occasional cleaning very little maintenance is required except for<br />
replacement when the packing rings have worn till their ends butt. At the same time the<br />
rubber sealing rings must also be replaced. Check them for brittleness, which make<br />
them useless as fluid seals.<br />
2. Particular attention should be paid to sealing ring grooves, which must be clean,<br />
the container faces must be gas <strong>and</strong> fluid tight, scores <strong>and</strong> indentations must be<br />
Chap 9 Page 113 of 168 OM002 Rev 5
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