❑
Cavitation
142
Appendix F: Cavitation
Hale Products, Inc., Nov.2005, Rev-A
❑
Consider the piping within the truck. Suction losses can result from addi-
tional suction piping added to the fire pump during assembly.
❑
Follow the maintenance and inspection procedures.
❑
Cavitation can also occur when air enters the pump. The pump could be
primed; however, air leaks can cause rough operation and an increase of
engine speed without an increase in pressure or flow. If an air leak is sus-
pected, refer to Section 5 “Troubleshooting” on page 67.
❑
Using “soft sleeve” vs. “hard sleeve.” The soft sleeve has an advantage as
the sleeve collapses under a partial vacuum (visual indication of cavitation),
even though the intake gauge might still indicate a positive pressure. With a
hard sleeve, the only indicator would be the intake gauge, which is inaccu-
rate at close to the ZERO (0) reading.
Strainers:
Clogged strainers or suction strainer selection, restricting flow. Verify the
hose strainers and suction strainer are clear (unobstructed) and located
deep enough in the water source to insure constant, uninterrupted water
flow.
Note: Strainer type, basket vs. barrel, also has an affect on water flow which can
contribute to flow restrictions, thus causing cavitation and reduced pump perfor-
mance, especially during high drafting conditions. Basket strainers are preferred by
Hale due to their overall suction and straining area.
❑
Turbulence or whirlpools in the hose line can be caused by excessive oper-
ating pressures from the intake source. Carefully monitor and reduce pres-
sures as needed.
Hose Diameter
in. (mm)
3”
(76)
4”
(102)
4.5”
(127)
5”
(127)
6”
(152)
Dual
6” (152)
Flow - gpm (lpm)
Lift Loss (gpm (lpm)
250 (946)
5.2 (20)
350 (1,325)
2.5 (9.5)
500 (1,893)
5.0 (19)
3.6 (13.6)
750 2,839)
11.4 (43)
8.0 (30)
4.7 (18
1.9 (7.2)
1,000 (3,785)
14.5 (55)
8.5 (32)
3.4 (13)
1,250 (4,732)
13 (49)
5.2 (20)
1,500 (5,678)
7.6 (29)
1.9 (7.2)
1,750 (6,625)
10.4 (39)
2.6 (10)
2,000 (7,571)
3.4 (13)
2,500 (9,464)
5.2 (20)
Figure F-7: Hose Size vs. Pump Rating Capacity
Summary of Contents for Silencer AP Series
Page 6: ...Overview 6 Silencer Series Booster Pump p n 029 0020 83 0...
Page 22: ...Introduction 22 Section 2 Introduction Hale Products Inc May 2006 Rev B...
Page 32: ...Accessories Options 32 Section 2a Accessories Hale Products Inc May 2006 Rev B...
Page 66: ...Preventive Maintenance 66 Silencer Series Booster Pump p n 029 0020 83 0...
Page 124: ...Installation 124 Basic Installation Hale Products Inc August 06 Rev B...
Page 143: ...143 Appendix F Cavitation Hale Products Inc Nov 2005 Rev A Cavitation...
Page 144: ...Cavitation 144 Appendix F Cavitation Hale Products Inc Nov 2005 Rev A...
