Spirax Sarco M33 ISO Series, Installation And Maintenance Instructions Manual

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IM-P133-65 CMGT Issue 2
12
6.4 How to replace the upper stem packing:
-
Observe the 'Safety information' in Section 1.
Warning: Isolate the ball valve both upstream and downstream and wait for the unit to reach ambient
temperature before handling.
-
Remove the gland nut ( 13 ).
-
Replace the upper stem packing ( 9 ).
-
Reassemble the unit and tighten the gland nut (
13
) to the recommended torque, see Table 1.
Please note - If leakage is observed through the stem, after 24 hours in service, it may be stopped by
retightening the gland nut ( 13 ) to the recommended torque, see Table 1.
Table 1 Recommended tightening torques
Part Size
N m (lbf ft)
ASME 150 ASME 300 ASME 150 ASME 300
Studs (19) and
Nuts (20)
DN50 60 140 44 103
DN65 60 220 44 162
DN80 60 220 44 162
DN100 140 140 103 103
DN150 140 220 103 162
DN200 350 350 258 258
Gland nut (13)
DN50 30 - 40 22 - 30
DN65 54 - 61 40 - 45
DN80 54 - 61 40 - 45
DN100 76 - 90 56 - 66
DN150 196 - 216 145 - 159
DN200 196 - 216 145 - 159