What is the difference between ASME B16.47 Series A and Series B?

ASME B16.47 Series AClass 150#Weld Neck (WN)Capacity: Strictly Up to 50 kg

ASME B16.47 Series A Class 150 Weld Neck Flange (MSS SP-44)

Precision closed-die drop forged and CNC machined from heat-tracked billets at our Rajkot manufacturing facility. Engineered with unbroken grain flow for high-pressure service up to 285 psi @ 100°F (19.6 bar ambient), adhering to EN 10204 3.1 and ISO 9001:2015 quality requirements.

Instant WhatsApp RFQ (+91 94995 58009)Call Rajkot Plant Head Calculate Weights by Alloy

Rajkot, Gujarat (IN-GJ 22.2597° N, 70.8123° E)

Deep-Water Port Mundra (240 km) & Port Kandla (230 km)

Quick AnswerFeatured

ASME B16.47 Series A Class 150 Large-Diameter Weld Neck Flanges (formerly MSS SP-44) feature heavier hub designs for cross-country pipelines. Radial-axial ring rolled in Rajkot up to 50 kg per piece for transmission lines.

StandardASME B16.47 Series A

Pressure Rating285 psi @ 100°F (19.6 bar ambient)

Facing FinishRaised Face 1/16" Serrated

Max Unit WeightUp to 50 kg max

ASME B16.47 Series A Class 150 Weld Neck Flange (MSS SP-44) — Dimensions & Weight Chart

All dimensions in millimeters (mm) and nominal weights in kilograms (kg) strictly manufactured up to 50 kg per piece.

Request Quantity Quotation

NPS	Metric DN	Outside Dia (OD mm)	Flange Thickness (mm)	Bolt Circle PCD (mm)	No. of Bolts	Hole Dia (mm)	Approx Weight (kg)
26"	DN650	775 mm	68.3 mm	749.3 mm	28	35 mm	42 kg✔ (≤50kg)
28"	DN700	832 mm	71.4 mm	806.5 mm	28	35 mm	48 kg✔ (≤50kg)

Engineering Note: Weights shown reflect standard carbon steel (ASTM A105, density 7.85 g/cm³). For Stainless Steel (304L/316L, density 8.00 g/cm³) or Duplex 2205 (7.80 g/cm³), multiply nominal weight by the metallurgical density ratio. All Jayesh Forge production strictly maintains our 50 kg max piece limit.

Available Metallurgical Grades

ASTM A105 — 100% heat batch tracked with full chemical and mechanical certification.
A350 LF2 — 100% heat batch tracked with full chemical and mechanical certification.
SS 316L — 100% heat batch tracked with full chemical and mechanical certification.
SS 304L — 100% heat batch tracked with full chemical and mechanical certification.

View complete metallurgy & EN 10204 3.1 inspection protocols

Primary Engineering Applications

Cross-Country Crude Pipelines
Refinery Main Headers
LNG Terminal Piping

Inquire about custom machining or special facings (RTJ/Tongue-Groove)

Rajkot Facility Manufacturing & Global Logistics Corridors

This component is hot-forged on high-speed closed-die friction presses and CNC finished at our Rajkot manufacturing center located at Plot No. 42/43, GIDC Industrial Estate, Rajkot, Gujarat - 360002, India. Global ocean freight dispatches weekly via Port Mundra (240 km) and Port Kandla (230 km) with rapid transit to Houston USA, Rotterdam Europe, and Dubai UAE.

ASME Standards Committee View Rajkot Plant Location (Google Maps) Back to All 56 Flange Standards

Related Flange Standards & Pressure Ratings

ASME B16.5 • Class 150#

ASME B16.5 Class 150 Weld Neck Flange Dimensions & Weight

Weight: Up to 50 kg max

View Chart

ASME B16.5 • Class 300#

ASME B16.5 Class 300 Weld Neck Flange Dimensions & Weight

Weight: Up to 50 kg max

View Chart

ASME B16.5 • Class 600#

ASME B16.5 Class 600 Weld Neck Flange Dimensions & Weight

Weight: Up to 50 kg max

View Chart

ASME B16.5 • Class 900#

ASME B16.5 Class 900 Weld Neck Flange Dimensions & Weight

Weight: Up to 50 kg max

View Chart

ASME B16.5 • Class 1500#

ASME B16.5 Class 1500 Weld Neck Flange Dimensions & Weight

Weight: Up to 50 kg max

View Chart

ASME B16.5 • Class 2500#

ASME B16.5 Class 2500 Weld Neck Flange Dimensions & Weight

Weight: Up to 50 kg max

View Chart

Frequently Asked Questions: ASME B16.47 Series A Class 150 Weld Neck Flange (MSS SP-44)

Series A (MSS SP-44) flanges are heavier, stronger, and have fewer but larger bolts than Series B (API 605) flanges, making them preferred for pipeline bending moments.