Lap Joint Flange

Short Description:

What is Lap joint flange Lap Joint Flanges (LJ Flanges) are used on piping fitted with lapped pipe or with lap joint stub ends the combined initial cost of the two items being approximately one-third higher than that of comparable welding neck flanges. Lap joint flanges use a stub end that is welded to the pipe. A ring flange fits loosely around the stub end, permitting easy flange alignment of the bolt holes. A lap joint flange is also called Van Stone or Stub Flange. The stub ends are avail...


  • FOB Price: US $0.5 - 9,999 / Piece
  • Min.Order Quantity: 100 Piece/Pieces
  • Supply Ability: 10000 Piece/Pieces per Month
  • Product Detail

    Product Tags

    What is Lap joint flange

    Lap Joint Flanges (LJ Flanges) are used on piping fitted with lapped pipe or with lap joint stub ends the combined initial cost of the two items being approximately one-third higher than that of comparable welding neck flanges.

    Lap joint flanges use a stub end that is welded to the pipe. A ring flange fits loosely around the stub end, permitting easy flange alignment of the bolt holes. A lap joint flange is also called Van Stone or Stub Flange. The stub ends are available in three styles (Types A, B, and C) and two lengths (Short and Long).

    Lap joint flange is having two components, a stub end, and a loose backing flange. Stub end is butt welded to the pipe and Backing flange freely move over the pipe. The backing flange can be of different material than stub material and normally of the carbon steel to save the cost. Lap flange is used where frequent dismantling is required, and space is constrained.Furthermore, a standard lap joint flange will typically have a longer hub length in comparison to a slip on flange, but this is often considered unnecessary for many applications.

    Specification

    Type

    :

    Lap joint Forged Flange

    Size

    :

    ½” (15 NB) to 48″ (1200NB)

    Standard

    :

    ANSI B16.5, ANSI B16.47, ANSI B16.36, ANSI B16.48, BS 4504, EN1092, UNI 2277/2278, DIN, JIS, SABS1123, GOST-12820

    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

    In Form

    :

    SORF, WNRF, BLRF, SWRF, LAP Joint, Threaded, Reducing, Spectacle, etc

    Specialize

    :

    As per drawing

    Coating/Surface Treatment

    :

    Anti-rust Paint, Oil Black Paint, Yellow Transparent, Zinc Plated, Cold and Hot Dip Galvanized

    Connection Type

    :

    Ring Type Joint, Lap-Joint Face, Raised Face, Flat Face, Large Male-Female, Small Male-Female, Large Tongue & Groove, Small Tongue & Groove

    Flange Face Type

    :

    Flat Face (FF), Raise Face (RF), Ring Joint (RJT)

    Dimensions

    :

    ANSI B16.5, ANSI B16.47 Series A & B, MSS SP44, ASA, API-605, AWWA, Custom Drawings

    Packing

    :

    No Fumigate or Fumigate Plywood/Wood Pallet or Case

    Usage

    :

    Oil Field, Offshore, Water System, Shipbuilding, Natural Gas, Electric Power, Pipe Projects etc.

    Materials and Grade

    Carbon Steel :

    ASTM A105 ,A350 LF2

    Alloy steel :

    ASTM A182 F11/F12/F22/F5/F9/F91

    Stainless Steel:

    ASTM A182 F304/ F304L/ F316/ F316L/F310

    Marking on the flange

    Shipping mark stick to outside of package. Following shall be marked on flange body.

    .Manufacturer logo

    .ASTM material code

    .Material Grade

    .Service rating (Pressure-temperature Class))

    .Size

    .Thickness (Schedule)

    .Heat No

    .Special marking if any QT (Quenched and tempered)

    or W (Repair by welding)

    Flanges Manufacturing Process

    1. Raw Material

    Raw Material Check

    Quantity Check

    Visual & Dimension Check

    2. Material Inspection

    Chemical Analysis Check

    Preservation Analysis Certificate

    3. Material Cutting

    Weight Measuring

    Cut Surface Check

    Marking

    4. Flange forging

    Material Grade Check

    Weight Measuring

    Temperature Control

    5. Heat Treatment

    Normalizing

    Tempering, Q.T

    Solution Treatment

    Mechanical Test

    6. Forging Rolling

    Material Grade Check

    Weight Measuring

    Temperature Check

    Dimension Check

    7.Final Inspection

    Dimension size inspect

    Visual Test

    Nondestructive Test

    8. Rust Prevention

    Preserve Check

    Marking on the flange

    Marking on the flange

    9. Well Packing

    Packing Spec. CheckPacking Spec. Check

    Packing Inspection

    Delivery


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