Hale 80FC - Manual (Page 68)

❑ Preventive Maintenance
68 Pump Ends
p/n: 029-0020-61-0
For Pitot gauge accuracy, the nozzle pressures should be between 30 and 85
PSIG (2.1 and 6.0 BAR / 0.21 and 0.6 MPa). Also see “Appendix E: Nozzle
Size vs. Pressure” on page 143.
The amount of discharge hose required for the service tests is dependent on
the flow requirements and capacity test point. Provide adequate hose to dis-
charge the rated capacity with a flow velocity less that 35 ft./sec. Also see
“Appendix D: Hose Friction Loss” on page 141 at the back of this manual.
Since NFPA standards specify both GPM and pressure, it is usually necessary
to restrict the flow somewhat to build up the pump pressure. In normal pump-
ing, this restriction would be caused by the friction loss in the lines. It is com-
mon practice to gate the discharge valves as required to maintain pressure.
Notes:
● For 750 GPM (2,839 LPM / 47 LPS) test, two 2-1/2” (64 mm) lines should be laid
from the pumper to the nozzle
● For 1,000 GPM (3,785 LPM / 63 LPS) test, three lines are required
Because deluge guns are not always available other hose layouts may be used, such
as one 2-1/2” (64 mm) line to a 1-3/8” (35 mm) nozzle for 500 GPM (1,892 LPM / 32
LPS). Generally, the nozzle used on one 2-1/2” line should not be larger than 1-1/2”
(38 mm) for accuracy in measuring GPM (LPM / LPS).
Another alternative when a deluge gun is not available consists of a 1-1/4 inch (32
mm) nozzle on one and a 1-1/2 inch (38 mm) nozzle on the other to pass 1,000 GPM
(3,785 LPM / 63 LPS). The sum of the flow from both nozzles is the GPM (LPM /
LPS) delivered by the pump. For good pitot gauge accuracy, the nozzle pressures
should be between 30 and 85 PSIG (2.1 and 5.8 BAR / 0.21 and 0.6 MPa).
Performance Testing
Note: The NFPA standards require a 10% reserve in pressure at the capacity run
when the apparatus is delivered.
1. Check the relief valve according to the Relief Valve Test procedure. See
heading “Relief Valve Test” on page 58.
❑ SLOWLY close the discharge valves. The rise in pressure shall not
exceed 30 PSI (2 BAR / 0.21 MPa), or approximately 180 PSI (12 BAR /
1.2 MPa) operating pressure.
❑ SLOWLY open the discharge valves to re-establish the original pressure
(150 PSI).
2. Perform steps 2 and 3 of the Post-Operation procedures. Also see 3.6 “Post
Operation Procedures” on page 51.