Material of Flange and Pipe Fitting

Pipe flange is a method of connecting pipes, valves, pumps and other equipment to form a piping system. It also provides easy access for cleaning, inspection or modification.

Dimensions from carbon steel and stainless steel flanges are defined in the ASME B16.5 standard. The material qualities for these flanges are defined in the ASTM standards.
These ASTM standards, define the specific manufacturing process of the material and determine the exact chemical composition of pipes, fittings and flanges, through percentages of the permitted quantities of carbon, magnesium, nickel, etc., and are indicated by "Grade".
For example, a carbon steel flange can be identified with Grade F9 or F11, a stainless-steel flange with Grade F316 or Grade F321 etc..
Below you will find as an example a table with chemical requirements for fittings ASTM A403 Grade WP304, WP304L, WP316L and a table with frequent Grades, arranged on pipe and pipe-components, which belong together as a group. As you may be have noted, in the table below, ASTM A105 has no Grade. Sometimes ASTM A105N is described;

"N" stands not for Grade, but for normalized. Normalizing is a type of heat treatment, applicable to ferrous metals only. The purpose of normalizing is to remove the internal stresses induced by heat treating, casting, forming etc. 

We also provide other similar material grade, such as the JIS Standard, DIN Standard, GB Standard, for detailed information, please feel free contact with us by E-mail.

General Classification	"ASTM" Symbols		Service
	Casting	Forgings	Temp
High-Temperature
Cast Iron	A126-Class B		250° C
Cast Iron	A126-Class C		250° C
Carbon Steel	A216-WCA		420° C
Carbon Steel	A216-WCB	A105	420° C
1/2Mo Steel	A217-WC1	A182-F1	500° C
1¼Cr-1/2Mo	A217-WC6	A182-F11	550° C
2¼Cr-1Mo	A217-WC9	A182-F22	600° C
5Cr1/2Mo	A217-C5	A182-F5a	600° C
9Cr-1Mo	A217-C12	A182-F9	650° C
Low-Temperature
Al Stel	A352-LCB,LCC	A350-LF2	-46° C
1/2 Mo Steel	A352-LC1		-60° C
2½ Ni Steel	A352-LC2		-73° C
3½ Ni Steel	A352-LC3	A350-LF3	-101° C
Stainless Steel
13Cr-1/2Mo	A217-CA15	A182-F6a	550° C
18Cr-8Ni(Co.03)	A351-CF3	A182-F304L	F304L 800° C
18Cr-8Ni(Co.08)	A351-CF8	A182-F304	F304 800° C
18Cr-8Ni-2Mo(Co.03)	A351-CF3M	A182-F316L	F316L 800° C
18Cr-8Ni-2Mo(Co.08)	A351-CF8M	A182-F316	F316 800° C
18Cr-8Ni-Ti		A182-F321	F321 800° C
18Cr-8Ni-Cb	A351-CF8M	A182-F347	F347 800° C
22Cr-12Ni	A351-CH20		1200° C
23Cr-19Ni	A351-CK20		1200° C
19Cr-27Ni-2Mo-3Cu	A351-CN7M		1200° C

Ring Type Joint Flange

Ring Type Joint Flange is a method of ensuring leak proof flange connection at high pressures. A metal ring is compressed into a hexagonal groove on the face of the flange to make the seal. This jointing method can be employed on Weld Neck, Slip-on and Blind Flange.

Standards, Dimensions & Weight

• Dimensions of Ring Joint Facings
• Ring Joint Facings ASME/ANSI B16.5 & B16.47-1
• Ring Joint Facings ASME/ANSI B16.5 & B16.47-2
• Ring Joint Facings ASME/ANSI B16.5 & B16.47-3
• Ring Joint Facings ASME/ANSI B16.5 & B16.47-4

Specifications:

• Size: 1/2” to 60”, DN 12mm to DN 1500mm
• Pressure class: Class 150 to Class 2,500, PN 2.5 to PN 250
• Facing: RF / RTJ

Material:

• Cabon steel: A105, A350 LF2
• Stainless steel: A182 F304/F304L/F316/F316L/F321
• Alloy steel: F11, F12
• Packing: plywood case and plywood pallet

Ring Joint Facings - ASME/ANSI B16.5 & B16.47-4

Ring joint facing dimensions - ASME/ANSI B16.5
and B16.47 Series A (MSS SP-44) and Series B (API 605) (Continued)

Notes

- Ring joint gasket dimensions conform to ASME B16.20 (not covered in this summary).

- Use Class 600 lb in sizes NPS 1/2 to NPS 31/2 for Class 400 lb.

- Use Class 1500 lb in sizes NPS 1/2 to NPS 21/2 for Class 900 lb.

- Tolerances are as shown in the table below.

1 The height of the raised portion is equal to the depth of groove dimension L, but is not subject to the tolerances for L.

2 Ring joints with lapped flanges in Classes 300 lb and 600 lb use R30 instead of R31.

Ring joint facing tolerances (ASME/ANSI B16.5 and B16.47)

What is a spectacle blind flange?

It is generally a piece of metal that is cut to fit between two pipe flanges and usually sandwiched between two gaskets. a spectacle blind is often made from two metal discs that are attached to each other by a small section of steel. 

+ A figure-8 blank

The shape is similar to a pair of glasses or "spectacles" - hence the name spectacle blind. One end of the blind will have an opening to allow flow through the pipe during operation and the other end is solid to block flow during maintenance. They are generally installed as a permanent device to separate process piping systems.

The whole idea of a spectacle blind is so that one can be absolutely sure that an item of equipment is properly and securely blanked off with no possibility of any flow or leakage through a valve during maintenance. The flow can be diverted to other items of equipment but not just bypassed around the blank as this would compromise the safety function of the spectacle blind. The flow has to valved off and pressure relieved prior to loosening flange bolts and swinging the blind.

These Flanges are available in the following range.

Stainless Steel: ASTM a182 F304, F304L, F304H, F316, F316L, F316Ti, F310, F310S, F321, F321H, F317, F347, F347H, F904L. 

Duplex Stainless Steel: UNS S31803, UNS S32750 

Carbon Steel: ASTM a105, 

Alloy Steel: ASTM a182 F1, F11, F22, F5, F9, F91 

Nickel Alloys: Monel 400 & 500, Inconel 600 & 625, Incoloy 800, 825, Hastelloy C22, C276 

Copper Alloys: Copper, Brass & Gunmetal 

Size: 1/8" NB TO 48"NB. 

Class: 150#, 300#, 400#, 600#, 900#, 1500#, 2500# 

Dimensional Standard

ANSI: ANSI B16.5, ANSI B16.47, MSS SP44, ANSI B16.36, ANSI B16.48 

DIN: DIN 2527, DIN 2566, DIN 2573, DIN 2576, DIN 2641, DIN 2642, DIN 2655, DIN 2656, DIN 2627, DIN 2628, DIN 2629, DIN 2631, DIN 2632, DIN 2633, DIN 2634, DIN 2635, DIN 2636, DIN 2637, DIN 2638, DIN 2673 

B.S: BS 4504, BS4504, BS1560, BS10

DIMENSIONS OF CLASS 150 FLANGES AS PER ANSI B 16.48
NB		a	B	C	D	E	T1	T2
½”	15	48	14	60		26	5	4
¾”	20	57	21	70		32	5	4
1”	25	67	27	79		38	5	4
1 ½”	40	86	41	98		52	5	4
2”	50	105	52	120	20	64	6	4
3”	80	137	78	152	20	86	8	6
4”	100	175	103	190	20	114	9	7
6”	150	222	154	241	22	148	12	10
8”	200	279	203	298	22	188	15	12
10”	250	340	254	362	26	154	18	15
12”	300	410	303	432	26	190	21	18
14”	350	451	343	476	30	208	23	20
16”	400	515	394	540	30	176	25	23
18”	450	550	445	578	33	188	28	26
20”	500	605	495	635	33	162	31	29
24”	600	720	597	749	36	194	37	34

DIMENSIONS OF CLASS 300 FLANGES AS PER ANSI B 16.48
NB		a	B	C	D	E	T1	T2
½”	15	54	14	66		30	5	4
¾”	20	67	21	83		36	5	4
1”	25	73	27	89		42	5	4
1 ½”	40	95	41	114		58	7	5
2”	50	111	52	127	20	68	8	6
3”	80	149	78	168	22	96	11	8
4”	100	181	103	200	22	118	13	10
6”	150	251	154	270	22	112	18	15
8”	200	308	203	330	26	138	23	19
10”	250	362	254	387	30	118	27	24
12”	300	422	303	451	33	138	32	28
14”	350	486	343	514	33	124	35	33
16”	400	540	394	571	36	140	39	37
18”	450	595	445	628	36	126	44	42
20”	500	655	495	686	36	140	49	47
24”	600	775	597	813	42	168	58	56

DIMENSIONS OF CLASS 600 FLANGES AS PER ANSI B 16.48
NB		a	B	C	D	E	T1	T2
½”	15	54	14	66		30	5	4
¾”	20	67	21	82		36	6	4
1”	25	73	27	89		42	7	4
1 ½”	40	95	41	114		58	9	6
2”	50	111	52	127	20	68	11	8
3”	80	149	78	168	22	96	15	12
4”	100	194	103	216	26	126	18	15
6”	150	267	154	292	30	116	24	21
8”	200	321	203	349	33	140	31	27
10”	250	400	254	432	36	128	38	33
12”	300	457	303	489	36	114	44	39
14”	350	492	343	527	39	122	48	44
16”	400	565	394	603	42	144	55	53
18”	450	613	445	654	45	155	62	60
20”	500	682	495	724	45	140	68	67
24”	600	790	597	838	52	164	81	80

All dimensions are in millimeters unless otherwise indicated. 

General notes: 
• D = Hole size (where required) should be the same as the flange bolt hole. In practice, these dimensions have been rounded round off upwards.
• T1 = Thickness Carbon Steel.
• T2 = Thickness Stainless Steel.
• W = Thickness of the web (or tie bar) should be 0.25 inch (6 mm) minimum, or equal to T1 and T2 if less than 0.25 inch (6 mm).
• Spectacle Blinds should be made from a plate or forging specification, approved for use by ASME B31.3, of essentially the same chemical composition as the mating flanges
   and piping involved.
• Depending on a customer specification, the dimensions can be different from what on this page is defined.

We are manufacturer of Spectacle blind flange and supply high quality Spectacle blind flange in both large and small quantities worldwide and offer you the best prices in the market.

We have a team of experienced professionals with years of experience in manufacturing. (www.sunnysteel.com)

AWWA Class D-Hub and Blind Flanges

1. Ring flanges available overbored or counterbored per customer specification.

2. Bolt holes shall be drilled 1/8th inch larger in diameter than the nominal diameter of the bolt, except for flanges larger than 84 inch in diameter which shall be drilled 3/16th inch larger than the nominal diameter of the bolt.

3. Drilling same as ANSI/ASME B16.1 125 lb and B16.5 150 lb pattern.

4. Flanges available overdrilled to accommodate insulators.

5. AWWA recommends the use of dished head assemblies as alternate to blind flanges, sizes over 72" nominal.

6. AWWA C207-01 Class B and D Hub Flanges are identical to Industry Standard Class 125 Light Weight Flanges

AWWA Class E-Ring and Blind Flanges

1. Ring flanges available overbored or counterbored per customer specification.

2. Bolt holes shall be drilled 1/8th inch larger in diameter than the nominal diameter of the bolt, except for flanges larger than 84 inch in diameter which shall be drilled 3/16th inch larger than the nominal diameter of the bolt.

3. Drilling same as ANSI/ASME B16.1 125 lb and B16.5 150 lb pattern.

4. Flanges available overdrilled to accommodate insulators.

5. AWWA recommends the use of dished head assemblies as alternate to blind flanges, sizes over 72" nominal.

6. AWWA C207-01 Class B and D Hub Flanges are identical to Industry Standard Class 125 Light Weight Flanges

AWWA Class E-Hub and Blind Flanges

1. Ring flanges available overbored or counterbored per customer specification.

2. Bolt holes shall be drilled 1/8th inch larger in diameter than the nominal diameter of the bolt, except for flanges larger than 84 inch in diameter which shall be drilled 3/16th inch larger than the nominal diameter of the bolt.

3. Drilling same as ANSI/ASME B16.1 125 lb and B16.5 150 lb pattern.

4. Flanges available overdrilled to accommodate insulators.

5. AWWA recommends the use of dished head assemblies as alternate to blind flanges, sizes over 72" nominal.

6. AWWA C207-01 Class B and D Hub Flanges are identical to Industry Standard Class 125 Light Weight Flanges