415.11.6.1 HPM having a health-hazard ranking of 3 or 4.
BC § 415.11.6.1
Systems supplying HPM liquids or gases having a health-hazard ranking of 3 or 4 shall be welded throughout, except for connections, to the systems that are within a ventilated enclosure if the material is a gas, or an approved method of drainage or containment is provided for the connections if the material is a liquid.













