Stainless/Duplex/Alloy/Carbon Steel Ljf Lap Joint Flange

• Standard: ANSI, DIN, GB, JIS, GOST, ANSI, DIN, JIS, GOST
• Type: Welding Flange, Welding Flange
• Material: Carbon Steel
• Structure: Round, Flanges
• Connection: Welding, Welding
• Sealing Surface: RF, RF
• Manufacturing Way: Forging, Forging
• Materials: A182 F304
• Technical: ASME B16.5
• Inspection: 100% Ut Passed
• Transport Package: Wooden Case
• Specification: Custom
• Trademark: kingmetal
• Origin: China
• HS Code: 73030010
• Production Capacity: 50000tons/Month

Product Description

Stainless/Duplex/Alloy/Carbon Steel LJF Lap Joint Flange
 

A lap-joint flange requires two piping components for each side of the flanged connection, a stub end and a loose backing flange. The loose backing flange fits over the outside diameter of the stub end, which is butt-welded to the pipe. The backing flange is not welded to the pipe, and it can be rotated, which is particularly useful when it is necessary to orientate flanges during erection.

Also, as the backing flange does not come in contact with the process fluid, it can made of a less corrosive-resistant material. For example, if the process is corrosive and requires the pipe to be of stainless steel, as in ASTM A312 TP316L, then the stub end must also be made of SS 316L; however, the backing flange can be made of the cheaper ASTM A105.

This method of jointing is not as robust as a weld neck flange but is superior to screwed, socket weld, and slip on connections; however, it is more expensive to execute, because it require a full-penetration butt weld and requires two components.

ANSI/ASME B16.5 Lap Joint Flange Specification

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 Standard ND-6,10, 16, 25, 40 Etc.
DIN	DIN2527, DIN2566, DIN2573, DIN2576, DIN2641, DIN2642, DIN2655, DIN2656, DIN2627, DIN2628, DIN2629, DIN 2631, DIN2632, DIN2633, DIN2634, DIN2635, DIN2636,DIN2637, DIN2638, DIN2673
BS	BS4504 , BS4504, BS1560, BS10
Coating/Surface Treatment	Antirust Paint, Oil Black Paint, Yellow Transparent, Zinc Plated, Cold and Hot Dip Galvanized
Flange Face Type	Flate Face (FF), Raised Face (RF), Ring Type Joint (RTJ)
Value Added Services	CNC Machining, Customised Flanges

ASME B16.47 Lap Joint Flange Material Specification

Stainless Steel Lap Joint 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 Lap Joint Flanges : 
ASTM / ASME A/SA 182 F 44, F 45, F51, F 53, F 55, F 60, F 61

Carbon Steel Lap Joint 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 Lap Joint Flanges : ASTM A350, LF2, LF3

Alloy Steel Lap Joint Flanges : 
ASTM / ASME A/SA 182 & A 387 F1, F5, F9, F11, F12, F22, F91

Copper Alloy Steel Lap Joint 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 Lap Joint 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)