NPS 26 to NPS 60 — Series A (MSS SP-44) and Series B (API 605)

ASME B16.47 Large Diameter Flanges — NPS 26 to NPS 60 — Saudi Arabia

Gulf Union Ozone sources ASME B16.47 large bore flanges to order for Saudi Arabia projects. Series A (based on MSS SP-44) and Series B (based on API 605). Blind, weld neck, and slip-on ring flange types in carbon steel, alloy steel, and stainless steel. EN 10204 3.1 mill test certificates supplied. Lead time 6–14 weeks depending on size and material. Submit RFQ with size, series, class, material, and quantity.

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ASME B16.47 large diameter flanges NPS 26 to 60 sourced to order Saudi Arabia — Gulf Union Ozone Jeddah
Standard Explained

What Is ASME B16.47 and When Is It Used?

ASME B16.47 (Large Diameter Steel Flanges: NPS 26 Through NPS 60) is the ASME standard governing steel flanges for pipe sizes above the NPS 24 limit of ASME B16.5. It covers two dimensional series — Series A (formerly MSS SP-44) and Series B (formerly API 605) — for pressure classes 75 through 900. Large diameter flanges under B16.47 are used in transmission pipelines, mainline process headers, large vessel nozzles, offshore platform piping, and any application where the process line diameter exceeds NPS 24.

In Saudi Arabia, ASME B16.47 large diameter flanges appear on Saudi Aramco crude oil trunk lines, natural gas transmission systems, refinery and NGL main headers, SABIC petrochemical plant large-bore sections, and major water injection pipeline flanges. The SAEP-347 piping material standard does not explicitly enumerate B16.47 flange material numbers in the same way as B16.5 flanges, so project material engineers must confirm the appropriate material class and heat treatment requirement for each application.

ASME B16.47 — At a Glance
  • Scope: Large diameter flanges NPS 26 to NPS 60
  • Series A: Based on MSS SP-44 dimensions (refinery/petrochemical)
  • Series B: Based on API 605 dimensions (pipeline/offshore)
  • Pressure classes: 75, 150, 300, 400, 600, 900
  • Flange types: Blind (BL), Weld Neck (WN), Slip-On Ring (SOR)
  • Facing: Raised Face (RF); Ring Type Joint (RTJ) for Class 600 and 900
  • Materials: Carbon steel (A105/A516), alloy (A182 F11/F22), SS (A182 F304L/F316L)
  • NOT interchangeable: Series A and Series B have different bolt circle diameters
  • Supply type: Fabricated/forged to order — not stocked ex-warehouse
  • Lead time: 6–14 weeks typical (size, class, and material dependent)
Dimensional Comparison

Series A vs Series B — Key Differences

Series A and Series B flanges are NOT interchangeable. They share the same pressure class names and the same ASME standard but have different outside diameters, bolt circle diameters, and bolt hole counts. A Series A flange bolted to a Series B counterpart will not align. Always verify the series required by your project piping specification before ordering.

Feature Series A (MSS SP-44) Series B (API 605)
Origin standard MSS SP-44 (Manufacturers Standardization Society) API 605 (now withdrawn, dimensions preserved)
Typical use sector Refinery / petrochemical / process plant Transmission pipeline / offshore
Outside diameter Larger OD for same NPS/class Smaller OD — more compact
Bolt circle diameter Different from Series B Different from Series A
Pressure classes 150, 300, 400, 600, 900 75, 150, 300, 400, 600, 900
Class 75 available? No Yes
Interchangeable with each other? NO — completely different bolt circle and OD. Do not mix.
Material Selection

ASME B16.47 Material Grades — What We Source

Material Spec Temperature Range Typical Application Lead Time
ASTM A105N (Normalised CS) ASME B16.47 A or B −29°C to 538°C General carbon steel, low-temp service 8–12 wks
ASTM A516 Gr.70 (Plate-derived) ASME B16.47 A or B −50°C to 343°C Vessel nozzle flanges, low-temperature 8–12 wks
ASTM A182 F11 (1¼Cr½Mo) ASME B16.47 A or B −29°C to 593°C High-temperature process, refinery heaters 10–14 wks
ASTM A182 F22 (2¼Cr1Mo) ASME B16.47 A or B −29°C to 649°C HP steam, high-temp hydrocracking 10–14 wks
ASTM A182 F304L ASME B16.47 A or B −196°C to 399°C Cryogenic, corrosive service 10–14 wks
ASTM A182 F316L ASME B16.47 A or B −196°C to 399°C Seawater, chloride-bearing service 10–14 wks

Lead times are indicative from mill order placement. Actual lead time depends on foundry loading, NPS size, and heat treatment requirements. Confirm with Gulf Union Ozone at RFQ stage.

Standard Comparison

ASME B16.47 vs ASME B16.5 — When Each Standard Applies

Criterion ASME B16.5 ASME B16.47
Size range NPS ½" to NPS 24" NPS 26" to NPS 60"
Pressure classes 150, 300, 600, 900, 1500, 2500 75, 150, 300, 400, 600, 900 (Series B); 150, 300, 400, 600, 900 (Series A)
Maximum pressure class 2500 900 (limited by practical flange size)
Ex-stock availability Yes — NPS ½ to 24" in A105 No — all sizes fabricated/sourced to order
Gulf Union Ozone stock Ex-stock (blind, WN, SO in A105) Sourced to order — RFQ required
Saudi Aramco use Process piping (SAES-L-108) Trunk lines, large-bore headers, vessel nozzles NPS 26+
How to Order

ASME B16.47 RFQ Checklist — What to Specify

Required RFQ Information
  1. ASME B16.47 Series (A or B) — confirm from project piping spec
  2. NPS size (e.g., NPS 30", NPS 36", NPS 48")
  3. Pressure class (75 / 150 / 300 / 400 / 600 / 900)
  4. Flange type (blind / weld neck / slip-on ring)
  5. Material grade (ASTM A105N / A516 Gr.70 / A182 F11 / F22 / F304L / F316L)
  6. Facing (raised face RF / ring type joint RTJ)
  7. RTJ groove type if applicable (R, RX, BX)
  8. Any special heat treatment (PWHT, normalise, solution anneal)
  9. Quantity per line item
  10. Required delivery date and project destination
Documentation Package
  • EN 10204 3.1 Mill Test Certificate (heat number, chemical, mechanical)
  • Certificate of Conformance (CoC) to ASME B16.47 and material standard
  • Dimensional inspection report (on request)
  • NDE/NDT reports if specified (UT, MT, PT per project ITP)
  • PWHT / heat treatment record (if applicable)
  • ISO 9001:2015 supplier certification copy
  • Saudi VAT invoice (311592828300003)
Lead Time Guidance

Carbon steel sizes NPS 26–36 in Class 150 and 300 typically ship in 6–8 weeks. Larger sizes (NPS 42–60), higher classes (Class 600–900), and alloy/stainless grades are 10–14 weeks. Plan B16.47 flanges at the earliest stage of project procurement — they are not standard stock items anywhere in Saudi Arabia.

ASME B16.47 FAQs

Frequently Asked Questions

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

Series A is derived from MSS SP-44 and is commonly used in refinery and petrochemical piping. Series B is derived from the now-withdrawn API 605 standard and is used in pipeline and offshore applications. The two series are not interchangeable — they have different outside diameters, bolt circle diameters, and bolt hole counts for the same NPS and pressure class. A mismatch cannot be corrected in the field. Always confirm the required series from your project piping specification or piping material class (PMC) document before ordering.

Do ASME B16.47 flanges need to be normalised?

For ASTM A105 carbon steel flanges in sizes and wall thicknesses above certain limits, ASME B16.47 requires normalising (N) heat treatment. A105N denotes a normalised forging — this is common for larger bore flanges where the through-wall thickness is such that the as-forged properties may not meet impact or toughness requirements. For Saudi Aramco projects, the project piping specification or SAES-H-001 may impose additional heat treatment requirements beyond the base standard. Always confirm the heat treatment requirement with your material engineer before ordering.

Can Gulf Union Ozone supply B16.47 flanges for Saudi Aramco projects?

Yes. Gulf Union Ozone sources ASME B16.47 Series A and Series B flanges to order from qualified mills supplying EN 10204 3.1 mill test certificates, dimensional inspection reports, and ISO 9001:2015 compliant quality documentation packages. As a Saudi LLC registered under CR 4030570569 with Jeddah warehouse operations, all commercial documentation complies with Saudi VAT and SAEP-347 project commercial requirements. Submit your RFQ with the full specification (series, NPS, class, material, facing, quantity, delivery date) for a lead time and price indication.

Related Flange Products

Full Range
All Flanges — ASME B16.5 and B16.47
Weld neck, blind, slip-on, socket weld, threaded, RTJ — all sizes and pressure classes.
ASME B16.5
Weld Neck Flanges — NPS ½ to NPS 24
Ex-stock Jeddah. ASTM A105/F11/F22/F304L/F316L. Class 150–2500. RF and RTJ facing.
Blind Flanges
Blind Flange Supplier Saudi Arabia — ASTM A105
Blind and slip-on flanges ASME B16.5 ex-stock Jeddah. Class 150–2500. Same-day dispatch.
Material Spec
ASTM A105 Carbon Steel Flanges
Full A105 spec: chemical tables, P-T ratings, SAEP-347 material numbers, all flange types.

Request an ASME B16.47 Large Diameter Flange Quote

Gulf Union Ozone sources ASME B16.47 Series A and Series B flanges to order from Jeddah. Include series, NPS, pressure class, flange type, material grade, facing, and quantity in your RFQ. EN 10204 3.1 MTCs and full quality documentation supplied with every order. Lead time and price indication provided within 2 business days of RFQ receipt.

Submit RFQ Form
In Summary

Gulf Union Ozone Trading Co. supplies ASME B16.47 Large Diameter Flanges to industrial customers across Saudi Arabia with delivery from our Jeddah warehouse — all products ship with original Mill Test Certificates and Certificates of Conformance.

In Summary

ASME B16.47 Large Diameter Flanges from Gulf Union Ozone serves Saudi Aramco SAEP-347 projects, SABIC, SADARA, SEC utilities, NEOM mega-projects, and industrial facilities across the Kingdom — our inventory covers the most common material grades and pressure ratings.

In Summary

Gulf Union Ozone stocks a wide range of ASME B16.47 Large Diameter Flanges including various grades, sizes, and pressure classes — contact us on WhatsApp for immediate availability confirmation and a quotation with full MTC documentation.

In Summary

For urgent ASME B16.47 Large Diameter Flanges procurement in Saudi Arabia, WhatsApp +966 55 098 8062 — our procurement team confirms stock availability within the hour and provides competitive quotations with full compliance documentation for Aramco, SABIC, SEC, and government projects.