77 - 3
Ram Piston Head Nut (cont’d)
Nut Fitting (cont’d)
Table 1
Required Tightening
Necessary Gauge
Torques
Pressure
Nm
lbf ft
bar
lbf/in
2
640
472
4.4
64
1400
1033
9.6
140
1470
1084
10.1
147
1790
1320
12.3
179
1840
1357
12.7
184
1900
1401
13.1
190
2230
1645
15.4
223
2300
1696
15.9
230
2620
1933
18.1
262
3480
2567
24.0
348
3580
2641
24.7
358
3590
2648
24.7
359
4590
3385
31.6
459
4820
3555
33.2
482
5140
3791
35.4
514
6220
4588
42.8
622
8700
6417
60.0
870
9100
6712
62.7
910
9330
6882
64.3
933
9425
6952
64.9
942
10700
7892
73.8
1070
10740
7922
74.0
1074
12700
9367
87.6
1270
12750
9404
87.9
1275
14000
10326
96.5
1400
16900
12465
116.5
1690
17700
13055
122.0
1770
19615
14468
135.2
1961
21000
15490
144.8
2100
21500
15858
148.3
2150
The torque is determined by reading the pressure on gauge
F
in the rig circuit (with the spanner at 90° to the rig ram) and
converting it according to the table above.
Note:
The pressures in the above table assume that the rig
is used with spanners having 500 mm centres.
Section E
Hydraulics
9803/6020
Section E
77 - 3
Issue 1
Hydraulic Rams
Summary of Contents for JS70
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Page 99: ......
Page 189: ...Section E Section E Hydraulics 9803 6020 Issue 1 33 4 33 4 Control Valves Control Valve 291360...