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ASTM A350 LF2 long weld neck flanges manufacturer in India

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SA 350 LF2 Raised face long weld neck flange supplier in Mumbai

ASTM A350 LF2 long weld neck flanges specification

What is the difference between ASTM A350 LF2 long weld neck flanges and weld neck flanges?

  • In piping operations, long neck and weld neck flanges are frequently employed.
  • A long weld neck flange according to ASTM A350 is useful in high-temperature and high-pressure applications. The sole applications for ASTM A350 Weld neck flanges, however, are low-pressure and low-temperature ones.
  • ASTM A350 LF2 long weld neck flange typically cost more than weld neck flanges.

Check features and applications of A350 LF2 LWN flange and A350 Gr LF2 Flat face long weld neck flanges

What are the 7 disadvantages of an A350 LF2 LWN flange?

  • The A350 LF2 LWN flange is manufactured using the forging process, specifically designed for applications in Ultra-High Vacuum (UHV) steel tube towers. However, the unique configuration of the flange presents challenges during the manufacturing process.
  • One of these arises from the asymmetrical axial shape of the flange. The transportation, transfer, and packaging, require special handling and care, hence added complexity.
  • Additionally, the A350 LF2 CL2 LWN flange tends to be costlier than other flange types. This is mainly due to its specialized design and the use of high-quality materials that meet stringent UHV requirements.

Table of Content

ASTM A350 LF2 Long Weld Neck Flanges Specification

Type Material Sizes
Long Weld Neck / LWNRF ASTM A350 LF2
  • 1/2"-48"
Classes ASME/ANSI Impact Test Temperature
Class 1 and Class 2
  • ASME B16.5
  • ANSI B16.5
 -20 ℉
Pressure Rating Test Certificates Face Types
Class 150 to Class 2500
  • EN 10204/3.1B
  • 100% Radiography Test Report
  • Flat face (FF)
  • Raised face (RF)
  • Ring type joint (RTJ)

A350 LF2 LWRNF flanges Price list

Product Price
1500#RFX A350 LF2 LONG WELD NECK FLANGE X420MM LONG US $7.16 per Kg
2500# RF RF ASTM A350 LF2 LONG WELD NECK FLANGE X 345MM LONG US $28.54 per Kg

Types Of ASTM A350 LF2 long weld neck pipe flange

ASTM A350 LF2 long weld neck flanges

ASTM A350 LF2 long weld neck flanges

A350 LF2 long weld neck flange

A350 LF2 long weld neck flange

SA 350 LF2 long weld neck Flange

SA 350 LF2 long weld neck Flange

A350 LF2 CL2 LWN flange and ASTM A350 Gr LF2 Ring joint long weld neck flanges can withstand pressures up to 15 bars

ASTM A350 Gr LF2 long weld neck Flange

ASTM A350 Gr LF2 long weld neck Flange

ASTM A350 LF2 Class 1 long weld neck Flange

ASTM A350 LF2 Class 1 long weld neck Flange

ASME SA 350 LF2 Class 1 long weld neck Flange

ASME SA 350 LF2 Class 1 long weld neck Flange

Check welding process of A 350 LF2 Long weld neck flange and SA 350 LF2 Class 2 LWN flange as per ASME B16.5 standards

A350 LF2 CL1 LWN flange dimensions

A350 LF2 CL1 LWN flange dimensions

Size in Inch Size in mm O.D. Flange Thick. Hub OD Weld Neck OD RF Dia RF Height No of Bolts Bolt Size UNC Machine Bolt Length RF Stud Length Hole Size
A B C D E F
1/2 15 90 9.6 30 21.3 34.9 2 4 1/2 50 55 5/8
3/4 20 100 11.2 38 26.7 42.9 2 4 1/2 50 65 5/8
1 25 110 12.7 49 33.4 50.8 2 4 1/2 55 65 5/8
1 1/4 32 115 14.3 59 42.2 63.5 2 4 1/2 55 70 5/8
1 1/2 40 125 15.9 65 48.3 73 2 4 1/2 65 70 5/8
2 50 150 17.5 78 60.3 92.1 2 4 5/8 70 85 3/4
2 1/2 65 180 20.7 90 73 104.8 2 4 5/8 75 90 3/4
3 80 190 22.3 108 88.9 127 2 4 5/8 75 90 3/4
3 1/2 90 215 22.3 122 101.6 139.7 2 8 5/8 75 90 3/4
4 100 230 22.3 135 114.3 157.2 2 8 5/8 75 90 3/4
5 125 255 22.3 164 141.3 185.7 2 8 3/4 85 95 7/8
6 150 280 23.9 192 168.3 215.9 2 8 3/4 85 100 7/8
8 200 345 27 246 219.1 269.9 2 8 3/4 90 110 7/8
10 250 405 28.6 305 273 323.8 2 12 7/8 100 115 1
12 300 485 30.2 365 323.8 381 2 12 7/8 100 120 1
14 350 535 33.4 400 355.6 412.8 2 12 1 115 135 1 1/8
16 400 595 35 457 406.4 469.9 2 16 1 115 135 1 1/8
18 450 635 38.1 505 457.2 533.4 2 16 1 1/8 125 145 1 1/4
20 500 700 41.3 559 508 584.2 2 20 1 1/8 140 160 1 1/4
24 600 815 46.1 663 610 692.2 2 20 1 1/4 150 170 1 3/8
Check difference of ASTM A350 LF2 Class 1 Long weld neck flange as per raised face and flat face types

ASTM A350 gr LF2 Long Welding Neck Flange chemical composition

Element Composition, w.t %
C ≤0.30
Ni ≤0.40
P ≤0.035
Cr ≤0.30
Mo ≤0.12
Cu ≤0.40
S ≤0.040
Mn 0.60-1.35
Si 0.15-0.30
Cb ≤0.02
V ≤0.08
N ...

SA350 LF2 Cl 1 long weld neck flanges mechanical properties

Grade/Class Yield Strength, min. Tensile Strength Hardness Elongation, min.
ksi MPa ksi MPa HBW max. %
LF2 CL2 36 250 70–95 485–655 197 22

Weight chart of ASTM A350 LF2 LWN Flanges

SIZE (inch) WEIGHT
Nom POUND
KILO
1/2 5
2,27
3/4 9
4,08
1 9
4,08
1 1/4 13
5,90
1 1/2 15
6,81
2 20
9,08
2 1/2 25
11,35
3 35
15,89
3 1/2 42
19,06
4 62
28,14
5 84
38,136
6 105
47,67
8 148
67,19
10 210
95,34
12 275
124,85
14 324
147,09
16 404
173,41
18 465
211,11
20 549
249,16
24 778
353,21

Pressure Ratings of A350 Gr LF2 Long weld neck flanges

Temperature °F Class 150 Class 400 Class 300 Class 900 Class 600 Class 2500 Class 1500
400 195 685 515 1540 1025 4280 2570
-20 to 100 275 960 720 2160 1440 6000 3600
200 235 825 620 1860 1240 5160 3095
500 170 635 480 1435 955 3980 2390
650 125 590 445 1330 890 3700 2220
700 110 580 430 1305 870 3620 2170
750 95 570 425 1280 855 3560 2135
800 80 565 420 1265 845 3520 2110
300 215 745 560 1680 1120 4660 2795
1150 20 315 235 710 475 1970 1185
600 140 600 450 1355 900 3760 2255
850 65 555 420 1255 835 3480 2090
900 50 555 415 1245 830 3460 2075
950 35 515 385 1160 775 3220 1930
1050 20 460 345 1030 685 2865 1720
1100 20 405 305 915 610 2545 1525
1200 20 245 185 555 370 1545 925
1500 20 55 40 125 85 345 205
1250 20 195 145 440 295 1230 735
1350 20 130 95 290 190 800 480
1000 20 465 350 1050 700 2915 1750
1400 20 100 75 225 150 630 380
1450 20 80 60 175 115 485 290
1300 20 155 115 350 235 970 585

Applications of A350 LF2 CL2 LWRNF flange

  • Petro chemical
  • Oil & Gas industry
  • Cement
  • Chemical industry
  • Refineries
  • Nuclear Power
  • Shipbuilding
  • Railway
  • Offshore

What are the 4 features of SA 350 LF2 Raised face long weld neck flange?

  • More weight can be supported by these flanges than by weld neck flanges.
  • The neck or hub of a SA 350 LF2 Raised Face Long Weld Neck Flange is stretched, or it is simply longer.
  • These flanges have a raised face on the flange surface that offers a reliable connection with no leaks.
  • These are used in a variety of industries, including the petrochemical and oil & gas sectors.
  • The SA 350 LF2 Class 2 Long weld neck flange has carbon steel as its primary building material. Hence, they are suitable for corrosive environments, and other high-temperature and high-pressure conditions.

Can A350 Gr LF2 Flat face long weld neck flanges handle more pressure?

  • Better load distribution is made possible by the flange's long neck design, which also lessens pressure concentration at crucial locations. Thus, the A350 Gr LF2 Flat face long weld neck flange has additional overall strength.
  • The A350 LF2 Long weld neck flange with a flat face can withstand greater pressure and keep its structural integrity even in difficult circumstances.
  • The gasket has a sizable, flat sealing surface area thanks to the flat face.
  • The long necks make welding and alignment simple. This makes a joint that can withstand greater pressure strong and long-lasting.

What are the typical welding requirements for ASTM A350 Gr LF2 Ring joint long weld neck flanges?

  • For applications where effective sealing is crucial, raised face flanges are ideal. In situations when there is little chance of a leak, flat face flanges are appropriate.
  • To weld ASTM A350 Gr LF2 Ring joint long weld neck flanges, select the appropriate welding technique. Examples include shielded metal arc welding (SMAW), gas metal arc welding (GMAW), and gas tungsten arc welding (GTAW).
  • The welding surface is then to be cleaned thoroughly to ensure dirt, dust, grease or other contaminants are removed.
  • Then, the right technique is to be employed for the welding. Also, adhere to appropriate welding parameters, like welding current, voltage, etc. for the most effective results.

What is the difference between RF and FF for ASTM A350 LF2 Class 1 Long weld neck flange?

  • Raised face and flat face ASTM A350 LF2 Class 1 Long weld neck flanges, respectively, are referred to as RF and FF. Here are the variations.
  • In contrast to FF flanges, RF flanges have a raised area on the flange face.
  • The majority of RF flanges employ flat gaskets, like spiral wound gaskets. Full-face gaskets are typically used with FF flanges.