Hale SMR - Manual (Page 67)

Stainless Max Series Pumps 4-15
Preventive Maintenance
❑
Because deluge guns are not always available, other hose
layouts may be used, such as one 2-1/2” (0.8 mm) line to a
1-3/8” (0.42 mm) nozzle for 500 GPM (1892 LPM).
Generally, the nozzle used on one, 2-1/2” line should not be
larger than 1-1/2 inches (0.46 mm) for accuracy in measuring
GPM (LPM).
Another alternative when a deluge gun is not available
consists of a 1-1/4” (0.38 mm) nozzle on one and a 1-1/2”
(0.46 mm) nozzle on the other to pass 1,000 GPM
(3,785 LPM).
The sum of the flow from both nozzles is the GPM (LPM)
delivered by the pump. For good pilot gauge accuracy, the
nozzle pressures should be between 30 and 85 PSIG (2.1 and
5.8 BAR).
❑
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 pumping, this restriction would be
caused by the friction loss in the lines. However, depending
on line loss alone would require a large amount of hose for
some tests.
It is common practice to use 50 to 100 feet (15.2 to 30.1
meters) of hose and gate the discharge valves as required to
maintain pressure.
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 Testing
procedure under Weekly Maintenance.
2. Perform steps 2 and 3 of the Post-Operation Maintenance
procedures, beginning on page 4-1.
3. Run the standard pump test in accordance with NFPA stan-
dards to check pump performance. Pumps rated below 750
GPM are tested for an hour per NFPA 1901, 14-13.2.3.2.
4. Run the engine for 20 to 30 minutes to stabilize the engine
temperature, then run the pump for:
❑
20 minutes at capacity
❑
10 minutes at 70% capacity
❑
10 minutes at 50% capacity