UL 51:2002 pdf download.Power-Operated Pumps for Anhydrous Ammonia and LP-Gas.
5.10 When warping of a casting can affect the tightness of lequld-confining joints, or the necessary lt Of parts, the casting shall be stress relieved to reduce to a minimum the possibility of warping,
5.11 A part made of drawn brass or machined from brass rod shall be capable of withstanding. without cracking, the 10-Day Mo451 Ammonia Air Stress Cracking Test, Sechon 19.
6 BodIes, Covers, and Heads
6.1 A pump body assembly shall comply with the requirements specified in the Deformation Test, Section
14; the Leakage Test, Section 15; and the Hydrostatic Strength Test. Section 18.
6.2 Flanges of parts intended to be clamped together shall have sufficient strength to withstand the
stresses imposed by tightening of the clampang bolts or cap screws.
6.3 Plugs and other paris. other than cap screws and bolts threaded Into noncorrosion-resistant ferrous parts of the pump, shall be of corros.on-resistant metal or be provided with a protective coating if their function is such that they are required to be removed for adjustment, repair, or other care of the pump.
6.4 A plug, cap, or other part threaded into or on the pump body shall engage with at least four full threads.
6.5 A bolt or a screw hole shall not extend through the outer walls of a pump body into a liquid-handling section.
7 StraIners
7.1 A strainer integral with or provided as part of a pump assembly shall conform to the requirements in
7.2 — 7.4 and the applicable requirements for the Standard for Strainers for Flammable Fluids and
Anhydrous Ammonia. UL 331.
7.2 A strainer shall be constructed so that when the screen or filter element is removed for cleaning, all foreign matter (sediment or dirt) is removed without the probability of any of the foreign matter being deposited in the outlet side of the strainer.
5.11 A part made of drawn brass or machined from brass rod shall be capable of withstanding. without cracking, the 10-Day Mo451 Ammonia Air Stress Cracking Test, Sechon 19.
6 BodIes, Covers, and Heads
6.1 A pump body assembly shall comply with the requirements specified in the Deformation Test, Section
14; the Leakage Test, Section 15; and the Hydrostatic Strength Test. Section 18.
6.2 Flanges of parts intended to be clamped together shall have sufficient strength to withstand the
stresses imposed by tightening of the clampang bolts or cap screws.
6.3 Plugs and other paris. other than cap screws and bolts threaded Into noncorrosion-resistant ferrous parts of the pump, shall be of corros.on-resistant metal or be provided with a protective coating if their function is such that they are required to be removed for adjustment, repair, or other care of the pump.
6.4 A plug, cap, or other part threaded into or on the pump body shall engage with at least four full threads.
6.5 A bolt or a screw hole shall not extend through the outer walls of a pump body into a liquid-handling section.
7 StraIners
7.1 A strainer integral with or provided as part of a pump assembly shall conform to the requirements in
7.2 — 7.4 and the applicable requirements for the Standard for Strainers for Flammable Fluids and
Anhydrous Ammonia. UL 331.
7.2 A strainer shall be constructed so that when the screen or filter element is removed for cleaning, all foreign matter (sediment or dirt) is removed without the probability of any of the foreign matter being deposited in the outlet side of the strainer.
