RISER PIPE FOR CONNECTING GAS METER

Japanese Patent JP3687868

B2

PROBLEM TO BE SOLVED: To shutout a plastic pipe for protecting it from an outside environment so as to solve the problem such that it is deteriorated by ultraviolet by fitting a metal bellows pipe connected to a feed gas meter through a packing to the upper end of the plastic pipe erected on the ground, whose lower end is connected to a plastic pipe which is laid in the underground.
SOLUTION: A riser pipe is formed by connecting the plastic pipe 30 arranged on a lower part thereof and a metal bellows pipe 40 arranged on an upper part there of to each other. The metal bellow pipe 40 is connected to a gas meter through a gas meter unit on the upper end thereof, it is inserted into the plastic pipe 30, and it is covered with a resin film 41 ion an outer surface. The plastic pipe 30 is connected by a plastic pipe which is laid on the underground and a joint, erected on the ground, and its outer surface is covered with a protecting pipe 50. A male screw 54 screwed around the female screw 31 of the plastic pipe is arranged on the upper inner surface of the protecting pipe 50, a packing 20 which is screwed ion the plastic pipe 30 and mounted on the wave recesses/projection part of the metal bellows pipe 40 is compressed, and the packing 20 is sealed between the plastic pipe 30 and the metal bellows pipe 40.

Takashi Anamizu
Tomoyuki Minami
Shuji Fukushima
Hideo Nozaki
Minoru Fujiyoshi

JP12291396A

August 24, 2005

May 17, 1996

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Hitachi Metals Co., Ltd.
Tokyo Gas Co., Ltd.

F16L17/02; F16L33/26; F16L57/00; F16L58/04; (IPC1-7): F16L33/26; F16L17/02; F16L57/00; F16L58/04

JP5180386A
JP60205086A
JP60205087A
JP620987U
JP672026U

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