Variable porosity irrigation pipe

Details Variable porosity irrigation pipe Variable porosity irrigation pipe

1984-10-01

1986-10-07

Taylor, Dennis

Hydraulic and earth engineering

Drainage or irrigation

Porous or apertured pipe, flume, or tileway

264 41, 239145, 405 36, 405 43, 521143, E02B 1300, A01G 2506

Patent

active

046156429

ABSTRACT:
Porous pipe having a porosity which varies continuously and controllably with length is produced by extruding a mixture of particles of prevulcanized elastomer such as reclaimed crumb rubber and a thermoplastic binder such as polyethylene with all parameters controlled except for die temperature of pull-off rate. By gradually varying temperature or pull-off rate during extrusion, the porosity of the pipe gradually changes. The leak rate can be controlled in a manner to produce a length of porous pipe in which the leak rate is constant as the pressure drops over the length of the pipe.

REFERENCES:
patent: 3552654 (1971-01-01), Thomas
patent: 3866833 (1975-02-01), Shibata et al.
patent: 4047768 (1983-10-01), Garcia et al.
patent: 4168799 (1979-09-01), Turner
patent: 4221501 (1980-09-01), Saburi
patent: 4434250 (1984-02-01), Kessler
patent: 4517316 (1985-05-01), Mason

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