ANSI B16.5 900LB Weld Neck Flange (WN), Long Neck Flange High Hub Flange Disc

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ANSI B16.5 900LB Weld Neck Flange (WN), Long Neck Flange High Hub Flange Disc

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ANSI B16.5 900LB Weld Neck Flange (WN), Long Neck Flange High Hub Flange Disc

Custom Standards: ASME, EN, ISO, JIS, or proprietary specs
Material Flexibility: From corrosion-resistant stainless steel (304，316L) to exotic alloys (Inconel, Hastelloy)
Precision Dimensions: Our advanced CNC systems handle diameters from DN 15 to DN 4000 with micron-level accuracy.

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Model:
WN Flange
Brand:
SDFL

Product Description

High-Quality Forged Stainless Steel Flanges & Pipe Fittings
WE PRODUCE FORGED FLANGES -- Your Reliable Industrial Pipeline Partner

Nominal Size		Outer Diameter	Inner Diameter	Flange Ring Height	Hub Diameter at Base	Weld End OD	Flange wall thickness	Sealing Face Diameter	Sealing Face Height	Flange Overall Height	Central circle diameter	Number of Bolt Holes	Bolt Hole Diameter
DN	NPS	A	B	C	F	E		G		D	J		I
15	1/2	120.6	15.7	22.3	38.1	21.3	5.6	35	6.4	60.45	82.6	4	22.3
20	3/4	130	20.8	25.4	44	26.7	5.9	42.9	6.4	69.85	88.9	4	22.3
25	1	149.3	26.7	28.4	52.3	33.5	6.8	50.8	6.4	73.15	101.6	4	25.4
32	1-1/4	158.7	35.1	28.4	63.5	42.2	7.1	63.5	6.4	73.15	111.3	4	25.4
40	1-1/2	177.8	40.9	31.7	69.85	48.3	7.4	73.15	6.4	82.5	124	4	28.4
50	2	215.9	52.6	38.1	104.6	60.45	7.9	91.9	6.4	101.6	165.1	8	25.4
65	2-1/2	244.3	62.7	41.1	123.9	73.15	10.5	104.6	6.4	104.6	190.5	8	28.4
80	3	241.3	78	38.4	127	88.9	10.9	127	6.4	101.6	190.5	8	25.4
100	4	292.1	102.4	44.4	158.7	114.3	11.9	157.2	6.4	114.3	234.9	8	31.7
125	5	349.2	128.3	50.8	190.5	141.2	12.9	185.7	6.4	127	279.4	8	35
150	6	381	154.2	55.6	234.9	168.4	14.2	215.9	6.4	139.7	317.5	12	31.7
200	8	469.9	202.7	63.5	298.4	219.2	16.5	269.7	6.4	162	393.7	12	38.1
250	10	546.1	254.5	69.85	368.3	273	18.5	323.8	6.4	184.1	469.9	16	38.1
300	12	609.6	304.8	79.25	419.1	323.8	19	381	6.4	200.1	533.4	20	38.1
350	14	641.3	336.6	85.8	450.8	355.6	19	412.7	6.4	212.8	558.8	20	41.1
400	16	704.8	387.4	88.9	508	406.4	19	469.9	6.4	215.9	615.9	20	44.4
450	18	787.4	438.2	101.6	565.1	457.2	19	533.4	6.4	228.6	685.8	20	50.8
500	20	857.2	489	107.9	622.3	508	19	584.2	6.4	247.6	749.3	20	53.8
600	24	1041.4	590.6	139.7	749.3	609.6	19	692.1	6.4	292.1	901.7	20	66.6

Chemical Pipeline Cases

(1) High-pressure Reactor Pipeline System
Typical media: Hydrogen (hydrogenation reaction), Ethylene (polymerization reaction)
Technical solutions:
Chromium-molybdenum steel A182 F11/F22 (resistant to hydrogen-induced cracking)
Fully automatic GTAW welding + 100% RT inspection
Matched with Inconel 718 metal wound gaskets
Example: The outlet pipeline of the reactor in the polyethylene plant, with a design pressure of 6.3 MPa @ 350℃
(2) Transportation of Corrosive Media
Special working conditions:
98% sulfuric acid pipeline: Hastelloy C276 flange + PTFE lining
Caustic soda evaporation system: A182 F317L ultra-low carbon stainless steel

Special working condition solutions

(1) Piping under alternating load

Technical measures:
The radius of the arc in the neck transition zone shall be ≥ 10mm (to reduce the stress concentration factor).
Fatigue analysis shall be carried out in accordance with Appendix F of ASME B31.3.
A hydraulic bolt tensioner shall be used to ensure uniform loading.

(2) Deep - water offshore engineering

Deep - sea pipeline connection:
Integrated design of the cathodic protection system
6DX ray inspection to replace conventional RT
Ultra - deep quenching treatment on the flange surface (hardness HRC55+)