MIL-T-62021 Trucks, Pipe And Sewer Cleaner: High Pressure Water Jet Type, 5680 Liter 1,500 Gallon, 12 700 Kilograms 28,000 Pounds Gvw, 4X2, Modified CommercialThis specification covers diesel and gasoline engine driven, four-wheel, two-rear-wheel drive, 5680 liter L 1,500 gallon, high pressure water jet, pipe and sewer cleaner modified commercial trucks having a gross vehicle weight GVW of 12700 kilograms kg 28,000 pounds, for normal operating conditions. Vehicles procured under this specification are commercial items which are warranted by the manufacturer as specified in acquisition documents.

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18 - 19 - 20 - 21 - 22 - 23 - 24 - 25 - 26 - 27 - 28 - 29

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.