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TM 5-3825-220-13&P
6-4.6 Wheel-Mounted Dry Chemical/AFFF Fire Extinguisher Cont'd
b.
It is recommended that the equipment be removed from service as soon as possible (dependent on immediate
safety conditions) whenever the following occur and that corrective maintenance action be taken:
1. Application hose leaks
2. Leaking tanks
3. Plugged lines
4. Malfunctioning valves
6-4.7 Hoselines
a.
The various hoselines provided for the TPT are described in para.'s 2-5.1 through 2-5.lj and in Fig.'s 6-1,6-2, 6-3,
6-4, 6-5,6-6, and 6-7.
b.
A hose repair kit is not currently part of the supply of NSN 3835-01-182-1976. The U.S. Army will, as
understood by WBEI, cause the supply of a repair kit similar and expanded from that described in para. 9-23 of the
Department of the Army technical manual TM 5-343 and in the Department of the Army technical manual TM 10-3835-
219-13&P. The kit will cover the requirements of the six (6) inch hose predominant in the TPT as well as smaller hoses.
c.
In addition to a supply similar to that described in TM 10-3835-219-13&P, a three (3) part proprietary hose clamp
is under consideration and test. The principles of the clamp are shown graphic all in Fig. 6-8. The adapter portion that
fits into the hose is smaller in diameter than the normal end adapter shown in Fig. 6-7 and thus easy to insert. The
pressure of the-part clamp and the O-ring seal the hose to the adapter. The 3-part clamp is merely bolted in place. A
key fits into a groove on the adapter to assure that the clamp is properly placed. Installation is thus simple and quick.
Tests thus far indicate the repair clamp will be very useful.
d.
The banded end fitting supplied with the hoselines is shown in Fig. 6-7. The adapter and hose have an
interference fit and thus the adapter must be mechanically pressed in place. The .044 inch x 3/4-inch stainless steel
bands are tensioned tightly around the hose sealing the hose and adapter surfaces. For reference, the tension applied to
the bands on assembly was approximately 15,000 psi and caused the 0.75 inch wide band to narrow to 0.0735 inches.
Tension was controlled by band width measurement.
e.
In general, the repair procedures for ruptured hose described in TM 10-3835-219-13&P, para. 3-15, adapted to
hose up to 6 inch are considered satisfactory and should be followed with the following qualifications.
1.
It is not generally recommended that the pressure sensitive tape method of repair be used for discharge
hoselines due to the pressures involved in the TPT. The procedure may be used on suction hose lines from the fabric
tanks to the first block valve at a pump. The procedure may be used on discharge hoselines between the last block
valve and the tank fill nozzle.
2.
It is generally recommended that the 3-part repair clamp currently under consideration be used for the bulk
of field repairs.
3.
A badly distorted suction hose should be replaced if the distortion is such as to extensively restrict flow.
6-16
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