Flowserve LPNV Worthington - Manual (Page 33)

LPNV USER INSTRUCTIONS ENGLISH 87900031 – 06/14
Page 33 of 48
6.6 Fastener torques
Main Flange Studs/Nuts (Top Casing to Bottom Casing)
Stud Size
Torque Value Materials:
A193Gr.B7(AISI4140), 17-4PH,
Monel K 500
Nm (lbft)
3/8” 16UNC
1/2”13UNC
5/8” 11UNC
3/4” 10UNC
7/8” 9UNC
1” 8UNC
1 1/8” 8UN
1 1/4” 8UN
1 3/8” 8UN
1 1/2” 8UN
1 5/8” 8UN
1 3/4” 8UN
1 7/8” 8UN
2” 8UN
2 ¼” 8UN
2 ½” 8UN
29
78
147
245
392
638
883
1226
1668
2060
2943
3728
4905
5396
7848
10497
(22)
(58)
(108)
(181)
(289)
(470)
(651)
(904)
(1230)
(1519)
(2170)
(2749)
(3617)
(3978)
(5786)
(7739)
Main Flange Studs/Nuts (Top Casing to Bottom Casing)
Stud Size
Torque Value Materials:
A193Gr.B8M(AISI316),
S31803(duplex), S32760(superduplex)
Nm (lbft)
3/8” 16UNC
1/2”13UNC
5/8” 11UNC
3/4” 10UNC
7/8” 9UNC
1” 8UNC
1 1/8” 8UN
1 1/4” 8UN
1 3/8” 8UN
1 1/2” 8UN
1 5/8” 8UN
1 3/4” 8UN
1 7/8” 8UN
2” 8UN
2 ¼” 8UN
2 ½” 8UN
25
59
118
196
294
491
687
981
1275
1570
2256
2943
3787
4415
5886
7848
(18)
(43)
(87)
(145)
(217)
(362)
(506)
(723)
(940)
(1157)
(1664)
(2170)
(2792)
(3255)
(4340)
(5786)
Mechanical Seal to Casing Cover
Stud/Nut Size
Torque Value (A193Gr.B8M material)
Nm (lbft)
1/2”
5/8”
3/4” 35-41
58-68
130-150
(26-30)
(45-50)
(95-110)
Torque Values listed above are selected to achieve
the correct amount of pre-stress in the threaded
fastener. Maintenance personnel must ensure that
threads are in good condition (free of burrs, galling,
dirt, etc.) and that commercial thread lubricant NILS
Wega 2 containing molybdenum disulphide is used.
Torque should be periodically checked to ensure that
it is at the recommended value.
6.7 Disassembly
Frequency of a complete overhaul depends upon
the hours of operation of the pump, the severity of
the condition and the care the pump receive in
operation. It is not necessary to open your pump for
inspection unless there is definite evidence that the
capacity has fallen off excessively or unless there is
indication of trouble inside the pump or in the
bearings.
Before performing any disassembly, maintenance
and/or inspection on the unit, the following steps
should be taken and warnings observed.
Refer to section 1.6, Safety, before dismantling
the pump.
Before dismantling the pump for
overhaul, ensure genuine Flowserve replacement
parts are available.
Refer to sectional drawings for part
numbers and identification.
Tag driver control in the “off” position.
Before attempting any inspection or repair on
the pump the driver controls must be in the "off"
position, locked and tagged to prevent restarting
equipment and injury to personnel performing
service on the pump.
Before attempting to disassemble the
pump, the pump must be isolated from the
system, by closing suction and discharge
system valves, drained of liquid and cooled, if
pump is handling hot liquid.
When the pump is handling “hot” liquid,
extreme care must be taken to ensure the safety
of personnel when attempting to drain pump. Hot
pumps must be allowed to cool before draining.
When the pump is handling “caustic”
liquid, extreme care must be taken to ensure the
safety of personnel when attempting to drain
pump. Protective devices of suitable protective
materials must be worn when draining pump.
Before attempting any maintenance work
on pumps in vacuum service, the pumps must
be isolated from suction and discharge system
then carefully vented to return pressure in pump
casing to atmospheric pressure.