Execution Standards: MT181—1988 'Safety Performance Inspection Specification for Plastic Pipes Used in Coal Mines'; AQ1043—2009 'Safety Marking for Mining Products'; MT558.1—2005 'Plastic Pipes for Coal Mines Part 1: Polyethylene Pipes' Mining Indicators (MT558.1—2005): Surface resistivity varies depending on the pipe's application. Requirements are as follows: a) Water supply and drainage pipes: The arithmetic mean of the outer wall surface resistivity should not exceed 10 × 10⁹ Ω; b) Positive pressure ventilation ducts: The arithmetic mean of the inner and outer wall surface resistivity...
Execution Standards: CJ/T189—2007 'Steel Wire Mesh Reinforced Plastic (Polyethylene) Composite Pipes and Fittings'; MT181—1988 'Safety Performance Inspection Specification for Plastic Pipes Used in Coal Mines'; Connection Methods: Internal clamp slip-on flange connection, external clamp slip-on flange connection, internal clamp grooved sleeve connection, external clamp grooved sleeve connection, butt weld flange connection, electrofusion flange connection, flanged flange connection, socket flange connection
