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API STD 526 Pressure Limitation Question

API STD 526 Pressure Limitation Question

API STD 526 Pressure Limitation Question

(OP)
Does anybody know why API STD 526 limits the pressure on some orifice/flange combinations. As an example, a 600#/150# 4X6 "L" orifice constructed out of carbon steel has a pressure limitation of 1,000 psig at 100 F (Table 10), though a 600#/150# 3X4 "K" at 100 F is rated at the full flange rating of 1,480 psig. There are some manufacturers that "deviate" from these pressure limitations outlined in 526, but I was hoping to learn the reason for the limitation before we accept valves that exceed those limitations.

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