875—91.6 (89) Pipe, valve, and fitting requirements.
	 91.6(1) Pipes, valves, and fittings subject to the effects of galvanic action shall not be used on objects covered by these rules except where permitted in 875—Chapter 95. Dielectric fittings shall be used where dissimilar metals are joined.
	 91.6(2) The minimum piping, valve, and fitting supplied on any object shall be Schedule 40.
	 91.6(3) The piping design must take into account the removal of material for mechanical joints such as threading or bolting, corrosion and erosion requirements, and the effects of hydrostatic head pressure.