Long Weld Neck Flanges Manufacturer
LONG WELD NECK FLANGES
Weld Neck Flanges in hard-to-nd metals. Long Weld Neck Flanges have a hub that extends from the Flanges at the surface, which helps in accommodating the pipe more easily. Alloy Steel Long Weld Neck Flange fall under the group of specialty flanges, reinforcement in services at higher temperatures in the oil industry. A Carbon Steel Long Welding Neck Flanges is preferable in the petroleum and chemical industry as they operate under actuating temperature ranges.
Standard Specification For Long Weld Neck Flanges
Dimensions : ANSI B16.5, ANSI B16.47 Series A & B, MSS SP44,
ASA, API-605, AWWA,
Custom Drawings
Size : 1/2″ (15 NB) to 48″ (1200NB)
Class : 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500
LBS
DIN : DIN2527, DIN2566, DIN2573, DIN2576, DIN2641, DIN2642,
DIN2655, DIN2656,
DIN2627, DIN2628, DIN2629,
DIN 2631, DIN2632, DIN2633, DIN2634, DIN2635, DIN2636,DIN2637, DIN2638,
DIN2673
DIN Standard
ND-6,10, 16, 25, 40 Etc.
BS : BS4504 , BS4504, BS1560, BS10 , PN6 , PN10 , PN16 , PN25 ,
PN40, etc
Table : D / E / F / H / J / K
API STANDARDS : PSI-2000/3000/5000/10000/ETC
JIS Standards : 2220-2004 5k/10k/16k , ETC
Flange Face Type : Flate Face (FF), Raised Face (RF), Ring Type
Joint (RTJ)
Material & Grades of Long Weld Neck Flanges :
Stainless Steel Long Weld Neck 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 Long Weld Neck Flanges :
ASTM / ASME A/SA 182 F 44, F 45, F51, F 53, F 55, F 60, F 61
Carbon Steel Long Weld Neck Flanges :
ASTM / ASME A/SA 105 ASTM / ASME A 350 , ASTM A 181 LF 2 / A516 Gr.70 A36, A694 F42,
F46, F52, F60, F65, F706
Low Temperature Carbon Steel Long Weld Neck Flanges : ASTM A350, LF2, LF3
Alloy Steel Long Weld Neck Flanges :
ASTM / ASME A/SA 182 & A 387 F1, F5, F9, F11, F12, F22, F91
Copper Alloy Steel Long Weld Neck 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 Long Weld Neck 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, Industries & Export Supply
Our Long Weld Neck Flanges are used for pressure vessel nozzles and high-load process joints requiring smooth stress transition. We supply project and replacement requirements with controlled quality, dimensional checks, and material traceability as per ASME / ASTM.
Industries Served: oil & gas, petrochemical, power, EPC, shipbuilding, water treatment, process manufacturing, and heavy engineering.
Supply Regions: India, GCC/Gulf countries, and global export destinations with commercial support for manufacturer, supplier, stockist, and exporter requirements.
Explore More: Flanges | Forged Fittings | Buttweld Fittings | Olets
Frequently Asked Questions: Long Weld Neck Flanges
Q: What is the main advantage of a Long Weld Neck Flange (LWN) over a standard Weld Neck Flange?
A: LWN Flanges have an elongated, heavy-wall hub that eliminates the need for an additional pipe extension. They are primarily used as nozzles on pressure vessels, custom tanks, and heat exchangers to provide maximum structural reinforcement under extreme pressure.
Q: Do you manufacture bespoke lengths for standard ASME B16.5 LWN flanges?
A: Yes. While standard lengths range depending on pressure class, we regularly machine custom heights (Heavy Barrel, Equal Barrel, etc.) direct from forged blanks to align with precise engineering drawings.