API 6A Type 6B 3000 PSI Weld Neck Flanges

API 6A 6B 3000 PSI Weld Neck RTJ Flange manufacturer

What is API 6A Weld neck flanges?

Weld neck flange made according to API 6A standard,API 6A Weld Neck Flanges are high-pressure pipe flanges specifically designed to meet the requirements of API Specification 6A, which governs equipment used in wellhead and Christmas tree systems for oil and gas drilling and production.

About API 6A Standard

API Specification 6A / ISO 10423 Petroleum and natural gas industries – Drilling and production equipment – Wellhead and christmas tree equipment
This International Standard specifies requirements and gives recommendations for the performance, dimensional and functional interchangeability, design, materials, testing, inspection, welding, marking, handling, storing, shipment, purchasing, repair and remanufacture of wellhead and christmas tree equipment for use in the petroleum and natural gas industries.
This International Standard does not apply to field use, field testing or field repair of wellhead and christmas tree
equipment.

Product Specification: API 6A – 6B Weld Neck Flange (3000 PSI)

Standard	API 6A – Specification for Wellhead and Christmas Tree Equipment
Product Type	Weld Neck Flange (WNRF)
Flange Class	API 6B
Working Pressure	20.7 MPa (3000 PSI)
Temperature Class	As per API 6A (e.g., L–U, varies by service condition)
Material Class	AA, BB, CC, DD, EE, FF, HH (based on environment & pressure)

API 6A 6B 3000 PSI Weld neck Flange Size & Dimensions

Nominal Sizes	1-13/16″, 2-1/16″, 2-9/16″, 3-1/8″, 4-1/16″, 5-1/8″, 7-1/16″
Facing Type	Raised Face (RF), Ring Joint Face (RTJ)
Bore Type	To match pipe bore or equipment interface
Drilling	Bolt hole pattern per API 6B standards

We also provide adapter flanges, blind flanges, and companion flanges

API 6A 6B 3000 PSI Flange Material Options

Material Grades	Standards
Carbon Steel	ASTM A105 / A694 F52–F70
Low-Alloy Steel	AISI 4130 / 4140
Stainless Steel	ASTM A182 F316, F316L,Duplex A182 F51,F53
Inconel®, Duplex, Super Duplex	On request (NACE compliance)

✔ NACE MR0175 / ISO 15156 compliance for sour service (H2S environments)

Testing & Certification

All API 6A flanges are manufactured and tested in compliance with the latest API 6A edition, and may include:

Hydrostatic Testing
Ultrasonic & Magnetic Particle Inspection
Hardness Testing
Impact Testing (Charpy V-Notch at -46°C / -50°F for PSL 2/3)
Chemical & Mechanical Certification
Material Test Certificate (MTC) EN 10204 3.1 / 3.2
API 6A License & Monogram (if applicable)

Marking

Heat No., Size, Pressure Class, API 6A monogram (if certified)

API 6A – 6B 20.7 MPA (3000 PSI) Weld Neck Flanges Dimensions

Size	B	OD	C (MAX.)	K	P	E	T	Q	X	BC	N	H	LN	HL	JL	Ring Number (R or RX)
2 1/16″	53.2	215	3	124	95.25	7.9	46.1	38.1	104.8	165.1	8	26	109.6	60.3	50	24
2 9/16″	65.9	245	3	137	108	7.9	49.3	41.3	123.8	190.5	8	29	112.7	73	59.7	27
3 1/8″	81.8	240	3	156	123.8	7.9	46.1	38.1	127	190.5	8	26	109.5	88.9	74.4	31
4 1/16″	108.7	290	3	181	149.2	7.9	52.4	44.4	158.8	235	8	32	122.2	114.3	98	37
5 1/8″	131	350	3	216	181	7.9	58.8	50.8	190.5	279.4	8	35	134.9	141.3	122.9	41
7 1/16″	181.8	380	6	241	211.2	7.9	63.5	55.6	235	317.5	12	32	147.6	168.3	147.1	45
9″	229.4	470	6	308	269.9	7.9	71.5	63.5	298.5	393.7	12	39	169.9	219.1	189.7	49
11″	280.2	545	6	362	323.9	7.9	77.8	69.9	368.3	469.9	16	39	192.1	273	237.2	53
13 5/8″	346.9	610	6	419	381	7.9	87.4	79.4	419.1	533.4	20	39	–	–	–	57
16 3/4″	426.2	705	6	524	469.9	11.2	100.1	88.9	508	616	20	45	–	–	–	66
20 3/4″	527.8	855	6	648	584.2	12.7	120.7	108	622.3	749.3	20	54	–	–	–	74