Goulds Pumps 3355 - IOM - Manual (Page 45)

Maintenance
Assembly references
Torque values
Table 3: Maximum torque values, in ft-lbs (Nm) for 1.5 x 2.5-7 and 2.5 x 4-8 pumps
Thread joint Screw Hexagonal Quality Pump size
nut 1.5 x 2.5-7 2.5 x 4-8
Size Dry Lubricated Size Dry Lubricated
Tie bolt 356S 357F 8.8 3/4- 190 (258) 142 (193) 1- 8UNC 325 (441) 295 (400)
11UNC
Bearing bracket 356A 425 8.8 8 x M12 31 (42) 28 (38) 8 x M12 42 (57) 38 (52)
(228C) with
suction casing
(100F) or dis-
charge casing
(100D)
Table 4: Maximum torque values, in ft-lbs (Nm) for 4 x 5-10 and 5 x 6-11 pumps
Thread joint Screw Hexagonal Quality Pump size
nut
4 x 5-10 5 x 6-11
Size Dry Lubricated Size Dry Lubricated
Tie bolt 356S 357F 8.8 1- 8UNC 244 222 (301) 1- 8UNC 352 320 (434)
(331) (477)
Bearing bracket 356A 425 8.8 8 x M16 71 (96) 64 (87) 8 x M20 112 99 (134)
(228C) with suc- (152)
tion casing
(100F) or dis-
charge casing
(100D)
Gap widths
Area A - Gap between the sleeve and suction casing
Pump size Nominal Gap "new" (inches) Maximum
diameter permissible gap
All iron and stainless fitted Stainless steel
Minimum Maximum Minimum Maximum
1.5 x 2.5-7 1.575 0.004 0.006 0.010 0.012 0.020
2.5 x 4-8 1.850 0.006 0.008 0.012 0.014 0.022
4 x 5-10 2.165 0.006 0.008 0.012 0.014 0.022
5 x 6-11 2.559 0.008 0.010 0.014 0.016 0.024
Area B - Gap between the impeller hub and diffuser
Pump size Nominal Gap "new" (inches) Maximum
diameter permissible gap
All iron and stainless fitted Stainless steel
Minimum Maximum Minimum Maximum
1.5 x 2.5-7 1.496 0.006 0.008 0.012 0.014 0.020
2.5 x 4-8 1.772 0.006 0.008 0.012 0.014 0.020
4 x 5-10 2.047 0.006 0.008 0.012 0.014 0.020
5 x 6-11 2.559 0.006 0.008 0.012 0.014 0.020
Area C - Gap between impeller and casings
Pump size Nominal Gap "new" (inches) Maximum
diameter permissible gap All iron and stainless fitted Stainless steel
Minimum Maximum Minimum Maximum
1.5 x 2.5-7 3.346 0.006 0.008 0.012 0.014 0.020
2.5 x 4-8 4.134 0.006 0.008 0.012 0.014 0.020
4 x 5-10 5.315 0.006 0.008 0.012 0.014 0.020
5 x 6-11 6.693 0.006 0.008 0.012 0.014 0.020
Model 3355 Installation, Operation, and Maintenance Manual 43