Ordinance on Industrial Safety and Health
Ministry of Labour Ordinance No. 32 of September 30, 1972
Latest Amendments:
Ministry of Health, Labour and Welfare Ordinance No. 47 of March 30, 2007
In Japanese
掲載日：2008.03.28
Part II Safety Standards
Chapter IV Prevention of Explosion, Fire, etc
Section 6 Acetylene Welding Equipment and Gas Welding Equipment Using Manifold
Subsection 2 Gas Welding Equipment Using Manifold
Article 308 (Installation of Gas Manifold)
- (1) The employer shall, as regards a gas manifold set forth in item (ii) of Article 1 of the Order (hereinafter referred to as “gas manifold”), install it in a place at a distance of 5 m or more from equipment using fire.
- (2) The employer shall, as regards a gas manifold other than movable one, install it in a purpose-built room (hereinafter referred to as “gas manifold room”).
- (3) The employer shall, as regards the space between the wall of the gas manifold room and a gas manifold, keep sufficient space for handling of the said device, exchanging of a gas cylinder, etc.
Article 309 (Structure of the Gas Manifold Room)
- (1) The employer shall conform a gas manifold room to the following provisions:
- (i) To not stagnate the gas when leaking gas.
- (ii) To be constructed with a roof and a ceiling made of lightweight and incombustible materials.
- (iii) To be constructed with a wall made of incombustible materials.
Article 310 (Piping of Gas Welding Equipment using Manifold)
- (1) The employer shall conform the piping of the gas welding equipment using manifold listed in item (ii) of Article 1 of the Order (hereinafter referred to as “the gas welding equipment using manifold”) to the following provisions:
- (i) For a joining portion of a flange, a valve, a cock, etc., to take measures of contacting at their joining surface tightly using a gaskets, etc.
- (ii) To install a safety equipment for the main pipe and branch pipe. In this case, install two or more safety equipment for each torch.
Article 311 (Restriction on the Use of Copper)
- (1) The employer shall not use copper or an alloy containing 70% or more copper for the piping of the gas welding equipment using manifold for dissolved acetylene and its accessories.
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