API Flanges Dimensions

The American Petroleum Institute or as shortened as API has developed specification api 15k flanges 6A, which is further categorised into two product specification levels i.e PSL 1 and PSL 2. While PSL 1 is a standard for quality, the api 6a flanges produced under PSL 2 has a very stringent testing method and adherence policy. For instance the api 10000 psi flanges PSL 2 needs to conform to the following parameters i.e. qualification, temperature, design, specification, process, hydrostatic test, and also inspection.

Check API 6A Flanges Standards and Weight

API Flanges

API Flanges Dimensions

API Flanges Standards

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Moreover, PSL 2 flanges demanded traceability until all the examinations have been cleared by the specification. Industries that use the API Flanges Dimensions include petroleum, petrochemical along with the natural gas industry as well as the drilling and manufacture equipment for offshore piping systems. Generally, the api 6a flanges material used to produce them include carbon steel, alloy steel, stainless steel, duplex and super duplex stainless steel grades as well as Inconel and Hastelloy.

Table of Content

Specifications Chart of API Flanges
Available Material of API Flanges
Dimensions of API Flanges
Price List of API Flanges

Specifications Chart of API Flanges

API Flanges Size Chart	1/2″ (15 NB) to 48″ (1200NB) DN10~DN5000
API Flanges Standards	ANSI/ASME B16.5, B16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, GOST Flange, ASME/ANSI B16.5/16.36/16.47A/16.47B, MSS S44, ISO70051, JISB2220, BS1560-3.1, API7S-15, API7S-43, API605, EN1092
UNI	6Bar 10Bar 16Bar 25Bar 40Bar
EN	6Bar 10Bar 16Bar 25Bar 40Bar
API Flanges Pressure Rating ANSI	Class 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS
API Flanges Pressure Calculation in DIN	6Bar 10Bar 16Bar 25Bar 40Bar / PN6 PN10 PN16 PN25 PN40, PN64
JIS	5K, 10 K, 16 K 20 K, 30 K, 40 K, 63 K
Test Certificates	EN 10204/3.1B Raw Materials Certificate 100% Radiography Test Report Third Party Inspection Report, etc
Coating	Oil Black Paint, Anti-rust Paint, Zinc Plated, Yellow Transparent, Cold and Hot Dip Galvanized
Most common types of API Flanges	forged / Threaded / Screwed / Plate
Production technique	forged, Heat treated and machined
Connect Type/ Flange Face Type	Raised Face (RF), Ring Type Joint (RTJ), Flat Face (FF), Large Male-Female (LMF), Lap-Joint Face (LJF), Small Male-Female (SMF), Small Tongue, Large Tongue & Groove, , Groove
Special design	As per your drawing AS, ANSI, BS, DIN and JIS 15 NB (1/2″) to 200 NB (8″) Equal and Reducing Configurations
Origin	Indian / West Europe / Japan / USA / Korean
Manufacturer of	ANSI DIN, GOST, JIS, UNI, BS, AS2129, AWWA, EN, SABS, NFE etc. API Flanges: -BS Flange, EN Flange, API 6A Flange, ANSI Flange, ASME Flange, DIN Flange, EN1092-1 Flange, UNI Flange, JIS/ KS Flange, BS4504 Flange, GB Flange, AWWA C207 Flange, GOST Flange, PSI Flange B.S: BS4504 , BS3293, BS1560, BS10 AS 2129: Table D; Table E; Table H ANSI B16.5, ANSI B16.47 Series A & B, MSS SP44, ASA, API-605, AWWA, Custom Drawings ANSI : ANSI B16.5, ANSI B16.47(API605), MSS SP44, ANSI B16.36, ANSI B16.48 ANSI B16.5, ANSI B16.47, MSS SP44, ANSI B16.36, ANSI B16.48 American standard (ANSI) German (DIN) British standard (BS) 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 API Flanges The other standard: AWWA C207; EN1092-1, GOST12820, JIS B2220; KS B1503, SABS1123; NFE29203; UNI2276
Test	Direct-reading Spectrograph, Hydrostatic testing machine, X-ray detector, UI trasonic flaw detector, Magnetic particle detector
Equipment	Press machine, Bending machine, Pushing Machine, electric bevelling machine, Sand-blasting machine etc

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Available Material of API Flanges

Carbon Steel	ASTM A105 ASME SA105 DIN 1.0402 DIN 1.0460 DIN 1.0619 ASTM A105N ASME SA105N ASTM A350 LF2 ASME SA350 High Yield CS ASTM A694
Stainless Steel	ASTM A182 F304 ASTM A182 F304L ASTM A182 F316 ASTM A182 F316L ASTM A182 F317 ASTM A182 F317L ASTM A182 F321 ASTM A182 F321H ASTM A182 F347 ASTM A182 F347H
Alloy Steel	ASTM A182 F5 ASTM A182 F9 ASTM A182 F11 ASTM A182 F22 ASTM A182 F91
Inconel	Inconel 600 Inconel 601 Inconel 625 Inconel 718 Inconel x750
Copper	T1, T2, C10100, C10200, C10300, C10400, C10500, C10700, C10800, C10910,C10920, TP1, TP2, C10930, C11000, C11300, C11400, C11500, C11600, C12000,C12200, C12300, TU1, TU2, C12500, C14200, C14420, C14500, C14510, C14520, C14530, C17200, C19200, C21000, C23000, C26000, C27000, C27400, C28000, C33000, C33200, C37000, C44300, C44400, C44500, C60800, C63020, C68700, C70400, C70600, C70620, C71000, C71500, C71520, C71640, etc
Copper Nickel	Copper Nickel 90/10 (C70600 ), Cupro Nickel 70/30 (C71500), UNS C71640
Brass	3602 / 2604 / H59 / H62 / etc.
Hastelloy	Hastelloy C276 (UNS N10276), C22 (UNS N06022), C4, C2000, B2, B3, X
Monel	Monel 400 (UNS No. N04400), Monel 500 (UNS No. N05500)
Alloy 20	Carpenter® 20 Alloy, Alloy 20Cb-3
Aluminium	5052 /6061/ 6063 / 2017 / 7075 / etc.
Nickel	Nickel 200, Nickel 201
Duplex	S31803 / S32205 A182 Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61
Super Duplex	S32750 / S32760 A182 Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61
Incoloy	Incoloy 800, Incoloy 800H, Incoloy 800HT (UNS N08800), Incoloy 825 (UNS N08825)
254 Smo	SMO 254/6Mo, UNS S31254, DIN 1.4547
Nimonic	Nimonic 75, Nimonic 80A, Nimonic 90
Other material	Tin bronze, Alumunum bronze, Lead bronze
Titanium	ASTM B381 Titanium Gr. 1 ASTM B381 Titanium Gr. 2 ASTM B381 Titanium Gr. 4 ASTM B381 Titanium Gr. 5 ASTM B381 Titanium Gr. 7

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Dimensions of API Flanges

Flange Size	Working Pressure (PSI)	Outside Diameter	Number of Bolt Holes	Diameter of Bolt Holes	Length of Bolts	API Ring Gasket
1-13/16″	10,000	7-3/8″	8	3/4″	5-1/4″	BX-151
1-13/16″	15,000	8-3/16″	8	7/8″	6″	BX-151
1-13/16″	20,000	10-1/8″	8	1″	7-3/4″	BX-151
2-1/16″	2,000	6-1/2″	8	5/8″	5/8″	R-23
2-1/16″	3,000/5,000	8-1/2″	8	7/8″	7/8″	R-24
2-1/16″	10,000	7-7/8″	8	3/4″	3/4″	BX-152
2-1/16″	15,000	8-3/4″	8	7/8″	7/8″	BX-152
2-1/16″	20,000	11-5/16″	8	1-1/8″	1-1/8″	BX-152
2-9/16″	2,000	7-1/2″	8	3/4″	5-1/4″	R-26
2-9/16″	3,000/5,000	9-5/8″	8	1″	7″	R-27
2-9/16″	10,000	9-1/8″	8	7/8″	6-1/4″	BX-153
2-9/16″	15,000	10″	8	1″	7″	BX-153
2-9/16″	20,000	12-13/16″	8	1-1/4″	9-1/2″	BX-153
3-1/8″	2,000	8-1/4″	8	3/4″	5-1/2″	R-31
3-1/8″	3,000	9-1/2″	8	7/8″	6-1/4″	R-31
3-1/8″	5,000	10-1/2″	8	1-1/8″	7-3/4″	R-35
3-1/16″	10,000	10-5/8″	8	1″	7-1/4″	BX-154
3-1/16″	15,000	11-5/16″	8	1-1/8″	8″	BX-154
3-1/16″	20,000	14-1/16″	8	1-3/8″	10-3/4″	BX-154
4-1/16″	2,000	10-3/4″	8	7/8″	6-1/4″	R-37
4-1/16″	3,000	11-1/2″	8	1-1/8″	7-1/2″	R-37
4-1/16″	5,000	12-1/4″	8	1-1/8″	8-3/8″	BX-155
4-1/16″	20,000	17-9/16″	8	1-3/4″	12-3/4″	BX-155
5-1/8″	5,000	14-3/4″	8	1-1/2″	10-3/4″	R-44
7-1/16″	2,000	14″	12	1″	7-1/2″	R-45
7-1/16″	3,000	15″	12	1-1/8″	8-1/2″	R-45
7-1/16″	5,000	15-1/2″	12	1-3/8″	11-1/4″	R-46
7-1/16″	10,000	18-7/8″	12	1-1/2″	11-3/4″	BX-156
7-1/16″	15,000	19-7/8″	16	1-1/2″	13″	BX-156
7-1/16″	20,000	24-13/16″	16	2″	17-3/4″	BX-156
9″	2,000	16-1/2″	12	1-1/8″	8-1/2″	R-49
9″	3,000	18-1/2″	12	1-3/8″	9-1/2″	R-49
9″	5,000″	19″	12	1-5/8″	12-1/2″	R-50
9″	10,000	21-3/4″	16	1-1/2″	13-1/4″	BX-157
9″	15,000	25-1/2″	16	1-7/8″	16″	BX-157
11″	2,000	20″	16	1-1/4″	9-1/4″	R-53
11″	3,000	21-1/2″	16	1-3/8″	10″	R-53
11″	5,000	23″	12	1-7/8″	14-1/4″	R-54
11″	10,000	25-3/4″	16	1-3/4″	15-3/8″	BX-158
11″	15,000	32″	20	2″	19-1/2″	BX-158
13-5/8″	2,000	22″	20	1-1/4″	9-1/2″	R-57
13-5/8″	3,000	24″	20	1-3/8″	10-3/4″	R-57
13-5/8″	5,000	26-1/2″	16	1-5/8″	12-3/4″	BX-160
13-5/8″	10,000	30-1/4″	20	1-7/8″	17-3/4″	BX-159
13-5/8″	15,000	34-7/8″	20	2-1/4″	21″	BX-159
16-3/4″	2,000	27″	20	1-1/2″	10-3/4″	R-65
16-3/4″	3,000	27-3/4″	20	1-5/8″	12-1/4″	R-66
16-3/4″	5,000	30-3/8″	16	1-78″	14-3/4″	BX-162
16-3/4″	10,000	34-5/16″	24	1-7/8″	17-3/4″	BX-162
18-3/4″	5,000	35-5/8″	20	2″	18″	BX-163
16-3/4″	10,000	40-15/16″	24	2-1/4″	23″	BX-164
20-3/4″	3,000	33-3/4″	20	2″	15-1/4″	R-74
21-1/4″	2,000	32″	24	1-5/8″	12-1/2″	R-73
21-1/4″	5,000	39″	24	2″	19″	BX-165
21-1/4″	10,000	45″	24	2-1/2″	24-3/4″	BX-166
26-3/4″	2,000	41″	20	1-3/4″	14-1/4″	BX-167
21-1/4″	3,000	43-3/8″	24	2″	17-1/2″	BX-168

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Price List of API Flanges

API Weld Neck Flanges	US $0.5-1000 / Piece (FOB Price)
API Threaded Flanges	US $300-500 / Ton (FOB Price)
API forged Flanges	US $1-900 / Piece (FOB Price)
API Socket Weld Flanges	US $0.5-1000 / Piece (FOB Price)
API Blind Flanges	US $1-300 / Piece (FOB Price)