Goulds Pumps 3393 - IOM - Manual (Page 35)

Installation
NOTICE:
The mechanical seal must have an appropriate seal-flush system. Otherwise, excess heat
generation and seal failure can occur.
When to install
You may need to install auxiliary piping for mechanical seal flush or other special features
supplied with the pump. Consult the pump data sheet for specific auxiliary piping recommenda-
tions.
Warm Up Piping
If temperatures of the pumped fluid will exceed 200°F (93°C), then warm up the pump prior to
operation. Circulate a small amount of fluid through the pump until the average casing
temperature is within 30°F (17°C) of the fluid temperature. The average casing temperature is
the average of the temperatures measured at the top and bottom of the casing. Accomplish this
by flowing fluid from the pump discharge drain to the pump suction nozzle. No other method is
acceptable. Additionally, the pump casing temperature differential between the top of any stage
casing and the bottom of the same stage casing must be less than 30°F (17°C). Failure to
observe this can result in casing distortion due to uneven thermal expansion, which, in turn,
may result in rotor seizure on startup.
The warm up flow shall be as follows:
• 2.5x4-8 and 2.5x5-8: 1 gpm (0.2 m3/hr)
• 4x5-10 and 4x6-10: 1.3 gpm (0.3 m3/hr)
• 5x6-11 and 5x8-11: 3.5 gpm (0.8 m3/hr)
• 6x8-13 and 6x10-13: 7 gpm (1.6 m3/hr)
Make sure that the temperature change during warm up does not exceed 9°F (5°C) per minute.
Checklist
Check Explanation/comment Checked
Check that cooling flows and pres- –
sures are in accordance with heat
exchanger manufacturer recom-
mendations.
Check that the cooling water pres- –
sure does not exceed 100 psig
(7.0 kg/cm
2 ).
Final piping checklist
Check Explanation/comment Checked
Check that the shaft rotates Rotate the shaft by hand. Make
smoothly. sure there is no rubbing that can
lead to excess heat generation or
sparks.
Re-check the alignment to make If pipe strain exists, then correct
sure that pipe strain has not the piping.
caused any misalignment.
Model 3393 Installation, Operation, and Maintenance Manual 33