ANSI B16.5 900LB Stainless Steel Internal Thread Flange Chemical/Mechanical Department

High-Quality Forged Stainless Steel Flanges & Pipe Fittings
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Nominal Size		Outer Diameter	Central circle diameter	Bolt Hole Diameter	Number of Bolt Holes	Inner Diameter	Flange Ring Height	Weld Groove Diameter	Flange Overall Height	Sealing Face Diameter	Sealing Face Height
DN	NPS	A	J	I		E	C	F	D	G	6.4
15	1/2	120.6	82.6	22.4	4	17	22.4	38.1	31.7	35.1	6.4
20	3/4	130	88.9	22.4	4	22.5	25.4	44.4	35	42.9	6.4
25	1	149.3	101.6	25.4	4	29	28.4	52.3	41.1	50.8	6.4
32	1-1/4	158.7	111.3	25.4	4	37.5	28.4	63.5	41.1	63.5	6.4
40	1-1/2	177.8	124	28.4	4	43.5	31.7	69.85	44.5	73.15	6.4
50	2	215.9	165.1	25.4	8	55	38.1	104.6	57.15	91.9	6.4
65	2-1/2	244.3	190.5	28.4	8	71	41.1	123.9	63.5	104.6	6.4

Key technological breakthroughs

Thread reinforcement technology:

Cold rolling thread process: 40% increase in strength compared to cutting threads

Laser cladding treatment: Stellite 6 alloy wear-resistant surface welding on threads

Sealing innovation:

Bimetallic self tightening gasket: The higher the pressure, the stronger the sealing performance (applicable to RTJ surface)

Nano coating sealing: thread spraying graphene coating achieves zero leakage

design code

Parameter technical requirements

Wall thickness calculation according to ASME B16.34 formula: t ≥ (P × D)/(2S × E+0.8P)

Thread engagement length ≥ 1.5 times nominal diameter (DN40 requires ≥ 60mm)

Pre tightening force control bolt load is calculated according to Appendix O of ASME PCC-1

NDE testing 100% ultrasonic testing (UT)+liquid penetrant testing (PT)