23
7.4.2.2 Perform Vacuum Test
Verify pump maintains a vacuum as follows.
A. Close all valves.
B. Ensure all caps are in place and tightened.
C. Use primer to pull vacuum of 22 (± 2) in Hg.
D. Verify apparatus maintains vacuum for 5 minutes.
NOTE
A vacuum loss of up to 2 inches per minute is the maximum loss permitted.
7.4.3 Annual Pump Maintenance
Perform procedures provided in the following paragraphs on the schedule indicated in Table 3.
7.4.3.1 Performance Testing
The yearly performance test consists of checking the pump performance and comparing the results
to when the pump first placed in service. One place to record the performance tests results is on
Figure C.3(c) found in Annex C of NFPA 1911.
Pump Testing Overview
The performance test provides a measure of any performance deterioration. Testing the pump under
the same conditions each year is key to understanding if there are any concerns with pump perfor-
mance. Using the original vehicle pump test data delivered with the apparatus, repeat this test at
delivery and record this data as the base line performance.
Because pump performance specifies both flow and pressure, it is 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 and the nozzle. However, depending on line loss alone would require a large
amount of hose for some tests. It is common practice to use short lengths of hose and gate the dis-
charge valves at the pump to maintain pressure.
Testing Equipment And Materials
NOTE
Refer to local procedures for pump testing procedures and practices.
To accurately test pumper performance, requires a calibrated Pitot gauge (or a calibrated flow meter)
and a vacuum gauge (or manometer) as well as a calibrated discharge pressure gauge.
Use pressure readings from the Pitot gauge. The volume pumped is then determined by referring to
nozzle tables. The Akron Brass website (www.AkronBrass.com) has a variety of flow test kits availa-
ble.
7.4.3.1.1 Test Procedure
NOTES
Run engine for 15 to 20 minutes to stabilize engine temperature before running pump
performance tests.
During annual test, pressure control functions, electrical systems and complete truck op-
eration should be verified in addition to pump performance.
If the apparatus does not reach performance levels, refer to FSG–MNL–00184, Tech-
nical Manual For Hale Single Stage Booster Pumps.
To Next Page
Loading...
