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Lap Joint Flanges

Lap joint flanges are a type of pipe flange connection composed of two main parts: a stub end and a lap joint ring flange. The stub end is welded to the pipe, and the lap joint ring flange fits over it, allowing for rotation and easy access for maintenance or repairs. They are often used in low to moderate pressure applications where flexibility and ease of disassembly are needed, such as in systems requiring regular maintenance or where access may be limited.
Here's a more detailed breakdown:

Components:

A lap joint flange consists of a stub end and a lap joint ring flange. The stub end is welded to the pipe, while the lap joint ring flange fits over the stub end and is free to rotate.

Function:

The stub end provides the connection to the pipe, while the lap joint ring flange allows for the flange to be easily rotated and disconnected for maintenance or repairs.

Advantages:
- Flexibility: The rotating lap joint ring flange allows for easy alignment and connection to other flanges.
- Ease of Disassembly: Lap joint flanges are easier to disassemble than slip-on flanges, making them suitable for systems that require frequent maintenance.
- Cost-Effectiveness: Lap joint flanges can be more economical than other flange types.
- Material Flexibility: They allow for the use of different materials for the stub end and the lap joint ring flange, potentially reducing costs.

Applications:

Lap joint flanges are commonly used in:

- Systems where frequent disassembly is required.
- Applications where access may be limited.
- Low to moderate pressure applications.
- Situations where it's desirable to align the bolts on the rotating flange.

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
Flange Face Type : Flate Face (FF), Raised Face (RF), Ring Type Joint (RTJ)

Material & Grades of Lap Joint Flanges :

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)

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