ASME B16.47 Class 300 Series A Flange

Common Materials:
– Carbon Steel: ASTM A105/A350 LF2
– Stainless Steel: ASTM A182 F304/F316
– Alloy Steel: ASTM A182 F11/F22

Common Dimensions:
– Size Range: Typically above 26″ up to 60″ (DN650-DN1500) or larger
– Pressure Rating: Class 300 (300 PSI)
– Flange Facings: Raised Face (RF), Ring Type Joint (RTJ), Flat Face (FF)

Product description

What is ASME B16.47 Class 300 Series A Flange

ASME B16.47 Class 300 Series A Flanges are robust, high-pressure flanges designed for demanding industrial applications, conforming to the American Society of Mechanical Engineers (ASME) standards. These flanges are rated for Class 300 pressure and belong to Series A, offering larger dimensions compared to Series B.

Common Materials:
– Carbon Steel: ASTM A105/A350 LF2
– Stainless Steel: ASTM A182 F304/F316
– Alloy Steel: ASTM A182 F11/F22

Production Processes:
Manufacturing ASME B16.47 Class 300 Series A Flanges involves precision machining and forging processes suited for larger diameters. Forged raw materials such as carbon steel, stainless steel, or alloy steel undergo shaping using forging machinery and precise machining to meet stringent dimensional requirements. CNC machining ensures accuracy and quality.

Applications:
These flanges find extensive use in industries requiring high-pressure piping systems, such as oil and gas, petrochemical, chemical processing, and power generation plants. They are specifically employed in pipelines carrying fluids or gases under high pressure and temperature conditions.

Common Q&A:

1. What distinguishes Series A from Series B flanges in ASME B16.47?
– Series A typically has larger dimensions compared to Series B, offering more space for welding and accommodating larger-sized pipes.

2. Why choose Class 300 over lower pressure-rated flanges?
– Class 300 flanges are designed to withstand higher pressure environments, ensuring the integrity and safety of piping systems in demanding applications.

Dimensions of ASME B16.47 Class 300 Series A Flange

Nominal Size	Outside Diameter	Min. Thickness [Note1] – WNF	Min. Thickness [Note1] – Blind	Length Through Hub	Hub Dia. Base [Note2]	Hub Dia. Top	Raised Face Dia.	Drilling – Bolt Circle Dia.	Drilling – No. of Bolt Holes	Drilling – Dia. of Bolt Hole	Dia. of Bolt	Min. Fillet Radius
Nominal Size	(OD)	(tf)	(tf)	(Y)	(X)	(A)	(R)	Drilling – Bolt Circle Dia.	Drilling – No. of Bolt Holes	Drilling – Dia. of Bolt Hole	Dia. of Bolt	(r1)
26	34.25	2.63	2.63	4.69	26.62	26	29.5	31.75	24	13⁄8	11⁄4	0.38
28	36.5	2.75	2.75	4.88	28.62	28	31.5	34	28	13⁄8	11⁄4	0.44
30	38.75	2.88	2.88	5.32	30.75	30	33.75	36	28	13⁄8	11⁄4	0.44
32	41.75	3.13	3.13	5.63	32.75	32	36	38.5	28	15⁄8	11⁄2	0.44
34	43.75	3.19	3.19	5.82	34.75	34	38	40.5	32	15⁄8	11⁄2	0.5
36	46	3.5	3.5	6.13	36.75	36	40.25	42.75	32	15⁄8	11⁄2	0.5
38	48.75	3.38	3.38	6.13	39	38	42.25	45.25	32	15⁄8	11⁄2	0.5
40	50.75	3.5	3.5	6.38	41	40	44.25	47.25	36	15⁄8	11⁄2	0.5
42	53	3.75	3.75	6.69	43	42	47	49.5	36	15⁄8	11⁄2	0.5
44	55.25	3.94	3.94	6.94	45	44	49	51.75	40	15⁄8	11⁄2	0.5
46	57.25	4	4	7.25	47.12	46	51	53.75	40	15⁄8	11⁄2	0.5
48	59.5	4.19	4.19	7.5	49.12	48	53.5	56	44	15⁄8	11⁄2	0.5
50	61.75	4.32	4.32	7.94	51.25	50	55.5	58.25	44	17⁄8	13⁄4	0.5
52	64	4.5	4.5	8.19	53.25	52	57.5	60.5	44	17⁄8	13⁄4	0.5
54	66.25	4.69	4.69	8.44	55.25	54	59.5	62.75	44	17⁄8	13⁄4	0.5
56	68.75	4.82	4.82	8.94	57.38	56	62	65	48	17⁄8	13⁄4	0.5
58	71	5	5	9.19	59.38	58	64	67.25	48	17⁄8	13⁄4	0.5
60	73	5.13	5.13	9.38	61.38	60	66	69.25	52	17⁄8	13⁄4	0.5

Notes
Dimensions are in inches.

1) The minimum flange thickness does not include the raised face thickness
2) This dimension is for the large end of hub, which may be straight or tapered.
3) Weldneck Bore/ID is to be specified by purchaser
4) For other details and tolerances see specification.

Sino Special Metal Supply offers ASME B16.47 Class 300 Series A Flanges suitable for critical industrial applications. Their flanges comply with international standards, ensuring reliability and performance in high-pressure piping systems. Customers are encouraged to inquire about specific material grades, sizes, or custom requirements for their projects.