The fittings, pipe and openings located between the system to be protected and the pressure-relieving device shall be sized to prevent hammering of the valve and to prevent impairment of relief capacity.
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not specify the location and minimum size of field-fabricated access openings, an opening not less than 12- inches by 12-inches (305 mm by 305 mm) shall ...
Where the manufacturer’s instructions do not specify the location and minimum size of field-fabricated access openings, an opening not less than 12 ...