In August 2025, one of our long-standing domestic clients placed another order for a batch of ASME B16.47 Series B Flanges. The specific product and material were 316L weld weld flanges.This marks not just another purchase but a continued chapter in our enduring partnership.
Upon order confirmation, we immediately initiated raw material inspections, dimensional checks, and pressure testing. We also processed the flanges according to the client’s specific packaging requirements to ensure safe and undamaged transport. Simultaneously, we provided the customer with a Material Test Certificate (MTC), ensuring every product detail is fully documented and traceable.
For us, each order represents more than just a transaction—it embodies the trust and recognition our customers place in us. We remain committed to delivering reliable pipe fittings and flange solutions to global clients with professionalism and responsibility.
For more information about ASME B16.47 Series B flanges, please click
To learn more about ASME B16.47 Series A flanges, please click
Weld Neck Flange Inspection
Outside Diameter Inspection
Use a caliper or specialized measuring tool to measure the flange’s outside diameter to ensure it complies with standards (such as ASME, EN, and DIN). The accuracy of the outside diameter directly impacts the fit of the flange with the pipe and fittings.
Thickness Measurement
The flange’s wall thickness determines its pressure-bearing capacity. Typically, an ultrasonic thickness gauge or vernier caliper is used to ensure the thickness meets the design pressure rating.
Bolt Hole Inspection
Check that the bolt hole diameters meet standards to avoid deviations during assembly.
Measure the center circle diameter (PCD) of the bolt holes to ensure they match the corresponding flange or equipment flange.
Verify the number and even distribution of bolt holes to avoid installation difficulties or seal failure due to asymmetry.
Surface Inspection
Check that the sealing surface is flat and smooth, free of cracks, scratches, or rust, to ensure proper sealing performance.
Material & Marking Inspection
Spectroscopic analysis or MTC (Material Certificate) verification confirms that the flange material meets customer and standard requirements. We also verify the integrity of flange surface markings, including specifications, pressure rating, material, and standard number.
ASTM A182 F316L Weld Neck Flange Chemical Composition
| CHEMICAL | LIMITS | C | Mn | P | S | Si | Ni | Cr | Mo | N |
| ASTM A182 F316 | MIN | 10.0 | 16.0 | 2.00 | ||||||
| MAX | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 14.0 | 18.0 | 3.00 | 0.10 | |
| ASTM A182 F316L | MIN | 10.00 | 16.0 | 2.00 | ||||||
| MAX | 0.03 | 2.00 | 0.045 | 0.030 | 1.00 | 15.00 | 18.0 | 3.00 | 0.10 |
ASTM A182 F316L Weld Neck Flange Mechanical Property
| MATERIAL | ASTM A182 F316 | ASTM A182 F316L |
| T.S (MPA) | 515 min | 485 min |
| Y.S (MPA) | 205 min | 170 min |
| EL % | 30 min | 30 min |
| R/A % | 50 min | 50 min |
ASME B16.47 Series B Class 150 Flange Dimensions
| Nominal Pipe S ize | A | C | D | E | F | G | H | I | J | R | |
| Overall Diameter | WNF Flange Thickness min | Blind Flange Thickness min | Overall Length WNF | Diameter at Weld Bevel | Hub Diameter | Face Diameter | Number of Holes | Bolt Hole Diameter | Diameter of Circle of Holes | Fillet | |
| mm | mm | mm | mm | mm | mm | mm | mm | mm | mm | ||
| 26 | 785.88 | 41.15 | 44.45 | 88.90 | 661.92 | 684.28 | 711.20 | 36 | 22.35 | 744.47 | 9.65 |
| 28 | 836.68 | 44.45 | 47.75 | 95.25 | 712.72 | 735.08 | 762.00 | 40 | 22.35 | 795.27 | 9.65 |
| 30 | 887.48 | 44.45 | 50.80 | 100.08 | 763.52 | 787.40 | 812.80 | 44 | 22.35 | 846.07 | 9.65 |
| 32 | 941.32 | 45.97 | 53.85 | 107.95 | 814.32 | 839.72 | 863.60 | 48 | 22.35 | 900.18 | 9.65 |
| 34 | 39.56 1004.8 | 49.28 | 57.15 | 110.24 | 865.12 | 892.05 | 920.75 | 40 | 25.40 | 957.33 | 9.65 |
| 36 | 1057.1 | 52.32 | 58.67 | 117.35 | 915.92 | 944.63 | 971.55 | 44 | 25.40 | 1009.7 | 9.65 |
| 38 | 1124.0 | 53.85 | 63.50 | 123.95 | 968.25 | 996.95 | 1022.4 | 40 | 28.45 | 1069.8 | 9.65 |
| 40 | 1174.8 | 55.63 | 66.55 | 128.52 | 1019.0 | 1049.3 | 1079.5 | 44 | 28.45 | 1120.6 | 9.65 |
| 42 | 1225.6 | 58.67 | 68.33 | 133.35 | 1069.8 | 1101.9 | 1130.3 | 48 | 28.45 | 1171.4 | 11.18 |
| 44 | 1276.4 | 60.45 | 71.37 | 136.65 | 1120.6 | 1152.7 | 1181.1 | 52 | 28.45 | 1222.2 | 11.18 |
| 46 | 1341.4 | 61.98 | 74.68 | 144.53 | 1171.4 | 1205.0 | 1234.9 | 40 | 31.75 | 1284.2 | 11.18 |
| 48 | 1392.2 | 65.02 | 77.72 | 149.35 | 1222.2 | 1257.3 | 1289.1 | 44 | 31.75 | 1335.0 | 11.18 |
ASME B16.47 Standard
This Standard covers pressure-temperature ratings, materials, dimensions, tolerances, marking, and testing for pipe flanges in sizes NPS 26 through NPS 60. Included here are flanges with rating class designations 75, 150, 300, 400, 600, and 900 with requirements given in both SI (metric) and U.S. Customary units, with diameter of bolts and flange bolt holes expressed in inch units. This Standard is limited to
(a) flanges made from cast or forged materials
(b) blind flanges made from cast, forged, or plate materials, Also, included in this Standard are requirements and recommendations regarding flange bolting, flange gaskets, and flange joints.
Material & Grades of ASME B16.47 Flanges
Carbon Steel Threaded Flanges :
ASTM A105 / A105N,ASTM A350 LF2 / LF3, A694 F42 / 46 / 52 / 56 / 65 / 70
Alloy Steel Threaded / Screwed Flanges :
ASTM / ASME A/SA 182 & A 387 F1, F5, F9, F11, F12, F22, F91
Stainless Steel Threaded Flanges :
ASTM A 182, A 240 F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H, 904L
Duplex & Super Duplex Steel Threaded Flanges :
ASTM / ASME A/SA 182 F44, F45, F51, F53, F55, F60, F61
Copper Alloy Steel Threaded Flanges :
ASTM SB 61 , SB62 , SB151 , SB152 UNS No. C 70600 (Cu-Ni 90/10), C 71500 (Cu-Ni 70/30), UNS No. C 10100, 10200, 10300, 10800, 12000, 12200
Nickel Alloy Threaded Flanges :
ASTM SB564, SB160, SB472, SB162 Nickel 200 (UNS No. N02200), Nickel 201 (UNS No. N02201), Monel 400 (UNS No. N04400), Monel 500 (UNS No. N05500), Inconel 800 (UNS No. N08800), Inconel 825 (UNS No. N08825), Inconel 600 (UNS No. N06600), Inconel 625 (UNS No. N06625), Inconel 601 (UNS No. N06601), Hastelloy C 276 (UNS No.N10276), Alloy 20 (UNS No. N08020)
Applications
Oil & Gas pipelines
Petrochemical plants
Water treatment and desalination projects
Power generation systems
Structural and general industrial piping
Advantages of Using Series B Flanges
Cost-effective for large diameter pipelines
Easy availability in multiple materials and sizes
Reliable sealing with fewer bolts
Reduced overall piping system weight
Why Choose ZIZI for ASME B16.47 Series B Flanges?
At ZIZI Engineering, we manufacture and supply a wide range of ASME B16.47 Series B weld neck and blind flanges. Our products are produced according to ASME, ASTM, and ANSI standards, ensuring durability and performance.
Quality Assurance: 100% inspection before delivery
Wide Material Range: Carbon steel, stainless steel, alloy steel, duplex
Global Supply: Fast delivery with strong export packaging
Customization: Available upon client request