H301/302 HSR Compressors | Rev. 2.2 | 25
Piston Head End and Crank End Clearance
The piston head end and crank end clearance is variable and determined by
the assembly of 10 or more parts depending upon the cylinder configuration.
Standard practice is to set the crank end piston clearance at 1/3 (but not less
than 0.040”) and head end clearance at 2/3 the summation of the head and
crank end clearances. Piston end clearance is measured by placing solder or
soft aluminum wire into the cylinder via an inlet port. Rotate crankshaft pushing
piston through stroke and crushing soft solder or aluminum wire. Use dial caliper
or 0-1” micrometer to measure crushed thickness of soft solder or aluminum
wire. Manually rotate the crankshaft several revolutions to assure no head end
interference. Monitor for abnormal vibration and/or knocking noise on startup
warm up. The CNG step cylinders having a concentric head end valve, set the
crank end piston clearance at 0.040 to 0.050”. CNG step cylinder piston head end
clearance measurement is difficult to achieve repeatable values and is, therefore,
not practical. Piston rod runout tolerance is 0.000 to 0.002” horizontal and 0.000 to
0.005” vertical measured with dial indicator.
Cylinder Sizes, Bores, Piston Diameters, Clearance and
Weight
The H301/302 cylinder size, bore and piston diameter, clearance and weight of the
fixed clearance or VVCP assembly for lubricated cylinders are listed below.
Cylinder
size
inches
(mm)
Bore diameter
inches (mm)
Piston
diameter
inches (mm)
Clearance
inches
(mm)
Double
Acting
cylinder
assembly
estimated
weight
pounds (kg)
Tandem/
Stepped
cylinder
assembly
estimated
weight
pounds (kg)
VVCP
assembly
estimated
weight
pounds (kg)
Cylinder
head
estimated
weight
pounds (kg)
1.25
(31.75)
1.250 (31.750)
1.252 (31.801)
1.238 (31.445)
1.242 (31.547)
0.008 (0.203)
0.014 (0.356)
1.5
(38.10)
1.500 (38.100)
1.502 (38.151)
1.488 (37.795)
1.492 (37.897)
0.008 (0.203)
0.014 (0.356)
1.75
(44.45)
1.750 (44.45)
1.751 (44.4754)
1.730 (43.942)
1.732 (43.9928)
0.018 (0.4572)
0.021 (0.5334)
2
(50.8)
2.000 (50.8)
2.001 (50.8254)
1.980 (50.292)
1.982 (50.3428)
0.018 (0.4572)
0.021 (0.5334)
2.5
(63.50)
2.500 (63.500)
2.502 (63.551)
2.488 (63.195)
2.492 (63.297)
0.008 (0.203)
0.014 (0.356)
190 (86.182)
170 (77.110)
6 (2.721)
3
(76.20)
3.000 (76.200)
3.002 (76.251)
2.982 (75.743)
2.992 (75.997)
0.008 (0.203)
0.020 (0.508)
190 (86.182)
170 (77.110)
19 (8.618)
8 (3.628)
3.5
(88.90)
3.500 (88.900)
3.502 (88.951)
3.480 (88.392)
3.485 (88.519)
0.015 (0.381)
0.022 (0.559)
270 (122.469)
130 ( 58.967)
31 (14.061)
10 (4.535)
4
(101.60)
4.000 (101.600)
4.002 (101.650)
3.983 (101.170)
3.987 (101.270)
0.013 (0.330)
0.019 (0.480)
280 (127.005)
140 (63.502)
34 (15.422)
11 (4.989)
4.5
(114.30)
4.500 (114.300)
4.502 (114.350)
4.482 (113.840)
4.487 (113.970)
0.013 (0.330)
0.020 (0.507)
310 (140.613)
-
46 (20.865)
15 (6.803)
Summary of Contents for H301 Series
Page 1: ...High speed reciprocating compressors H301 and 302 series operating manual GE Oil Gas ...
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Page 17: ...H301 302 HSR Compressors Rev 2 2 7 ...
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Page 61: ...H301 302 HSR Compressors Rev 2 2 51 ...
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Page 103: ...H301 302 HSR Compressors Rev 2 2 93 ...
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Page 114: ...104 Chapter 8 Maintenance Figure 21 Effective rod extension amount pocket is open ...
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Page 135: ...H301 302 HSR Compressors Rev 2 2 5 ...
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