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|  MIL-T-62021E(AT)
fixed control panel shall be furnished. The operator shall be completely shielded from all the
apparatus and high-pressure piping. The noise level in the operator's area shall not exceed
84 db(A).
3.5.6.1 Portable control. In addition to the controls and gages attached to the fixed control
panel, a portable control station, that shall be capable of being detached from the fixed station and
carried by the operator, shall be furnished. The portable control station shall be linked to the fixed
control panel by a multi-conductor flexible electrical cable and shall contain two switches: one
switch to turn the water on or off; the other to raise, lower or stop the nozzle and cleaning hose.
The portable control station shall enable control of operation of apparatus from any location
within at least 15 m (50 feet) from the fixed station.
3.5.7 Hose reel. The hose reel shall be of heavy duty construction and shall be capable of
withstanding any mode of operation without collapsing or distorting. The ends shall be rounded
to prevent damage to the hose when it comes into contact. The reel shall be capable of holding
305 m (1,000 feet) of 25 mm (one inch) inside diameter (id) high pressure plastic hose. The reel
shall be power driven in both directions. The reel shall be equipped with a manual means of
emergency operation. The reel shall be designed so that it will not be necessary for the operator to
guide the hose on or off. All drive chains, sprockets, and like items shall be provided with guards
where necessary for the safety of the operator.
3.5.7.1 Hose. Not less than 185 m (six hundred feet) of 25 mm (one inch) id heavy duty
plastic hose, shall be furnished and installed on the reel. The hose working pressure shall be not
less than the maximum output pressure of the water pump. The hose shall be one-piece. The
cover of the hose shall be resistant to the scuffing, acids and greases normally encountered during
the cleaning of a sewer line. The hose and fittings shall be capable of withstanding a minimum of
13340 Newtons (N) (3,000 pounds) tensile load without damage. The length of the hose shall not
change more than one percent as a result of changes in internal pressure in the range of 0 kPa
(0 psi) to 17 790 kPa (2,000 psi) at the inlet end of the hose. The end of the hose shall be
provided with a fitting to accept lead hoses, nozzle and cleaning gun assemblies specified in
3.5.7.2 and 3.5.7.4.
3.5.7.2 Nozzles. Stainless steel or hardened carbon steel cleaning nozzles shall be
furnished. A 15 to 18 degree radial nozzle and a 30 to 35 degree radial nozzle shall be provided.
3.5.7.3 Hose guide shoe. A hose guide shoe with sectional (add-on type) handle shall be
furnished. The design of the guide shoe shall facilitate entry of the nozzle and hose into sewers
and shall protect the nose from the sharp ends of sewer tile.
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