Goulds Pumps VIT - IOM - Manual (Page 39)

1
2
3
4
5
6
7
8
9
10
11
1. Stud
2. Hex nut
3. Packing
4. Tension nut
5. Bearing
6. Capscrew
7. Packing rings
8. Tension plate
9. Tube nipple
10. Line assembly water flush
11. Gland
Figure 9: Tension plate - water flush
Tension the enclosing tube
The enclosing tube sags from its own weight as it is installed and must be pulled tight (tensioned) to make
it straight. This section describes two methods you can use to tension the tube:
• Direct pull method is more precise and is preferred.
• Wrenching method is given as an alternate.
The correct tension is equal to the weight of the enclosing tube plus 10%. Weights per unit length for each
tube size are given in this table. Multiply by the total length of the tube to determine the total weight.
Table 4: Tube weight
Tube diameter in inches (millimeters) Weight in pounds (kilograms) per foot of length
1.25 (31.75) 2.99 (1.36)
1.50 (38.10) 3.63 (1.65)
2.00 (50.80) 5.02 (2.28)
2.50 (63.50) 7.66 (3.47)
3.00 (76.20) 10.25 (4.65)
3.50 (88.90) 12.50 (5.67)
4.00 (101.60) 14.98 (6.80)
Installation (Continued)
Model VIT Installation, Operation, and Maintenance 37