ASME B16.9 Lap Joint Stub End, Lap Joint Stub End with Flange, Lap Joint Stub End Types Pipe Fittings : ANSI/ASME B16.9, B16.28, MSS-SP-43

Lap Joint Stub End ASME B16.9
Torrent Alloys
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Butt weld Lap Joint Stub End Specifications

  • Dimensions:

    ASME/ANSI B16.9, ASME B16.28, MSS-SP-43.

  • Size:

    Small Sizes: 1/2 inch (15 mm)
    Medium Sizes: Up to 24 inches (600 mm)
    Large Sizes: Up to 36 inches (900 mm)

  • Type:

    Seamless, Welded, & ERW.

  • Thickness:

    Schedule 5S, 10S, 20S, S10, S20, S30, STD, 40S, S40, S60, XS, 80S, S80, S100, S120, S140, S160, XXS.

  • Form:

    flat or beveled face, Reducing Lap Joint Stub End, Long Lap Joint Stub End, Short Lap Joint Stub End.

  • Materials:

    Stainless Steel, Carbon Steel, Alloy Steel, Super Duplex, Duplex Steel, High Nickel Alloys, Copper Nickel.

Top Manufacturer of High-Quality Lap Joint Stub Ends ANSI, Lap Joint Stub End Weld Neck, Lap Joint Stub End ANSI B16.9, Welded lap joint stub end, Stainless steel lap joint stub end, Carbon steel lap joint stub end, Industrial Lap Joint Stub Ends - 1/2 inch to 36 inch.

A Lap Joint Stub End is a short pipe section with a flange at one end, designed to be used with a corresponding lap joint flange. The stub end is typically manufactured with a specific face and end design that fits into the flange, allowing for easy assembly and disassembly. It is generally characterized by its flat or beveled face, which aligns with the lap joint flange. The stub end may also have a specific thickness and dimension to match the pipe and flange specifications.

Manufacturing Lap Joint Stub Ends involves several key steps to ensure high-quality and precision. The process starts with selecting suitable materials, such as carbon steel, stainless steel, or alloy materials, tailored to the specific requirements of the application. The raw material is then cut to the desired length and subjected to forming processes, including rolling or bending, to achieve the required shape. For stub ends that include a flange, the flange face is meticulously machined to match the corresponding lap joint flange. The stub end is then welded to the pipe or attached using other methods as specified.

After the initial fabrication, the lap joint stub end undergoes rigorous quality control measures. This includes dimensional checks, pressure testing, and inspection for any surface defects to ensure compliance with industry standards, such as ASTM or ANSI. The final product is then cleaned, and, if required, coated to prevent corrosion or other damage. Once these quality assurance steps are completed, the lap joint stub end is prepared for shipment, ready for integration into piping systems where it will facilitate efficient and flexible connections.

Installing a Lap Joint Stub End involves first welding or attaching the stub end to the pipe, ensuring a secure and aligned connection. Next, a lap joint flange is bolted onto the stub end, with a gasket placed between them to create a leak-proof seal. The flange allows for easy alignment and adjustment before final tightening. This method provides flexibility in the connection, making it ideal for applications requiring frequent maintenance or modifications.

Type A Lap Joint Stub End features a long taper that provides a smooth transition and precise alignment between the pipe and lap joint flange. This design is ideal for applications requiring exact fitting and alignment, offering flexibility during installation and ensuring a secure, stable connection. It is commonly used in high-pressure systems and industries where ease of maintenance is crucial.

Type B Lap Joint Stub End is characterized by its shorter taper compared to Type A. This design is tailored for applications where space is constrained or where a shorter, more compact connection is needed. The reduced taper allows for easier installation in tight spaces while maintaining compatibility with lap joint flanges. Type B provides a reliable connection in various piping systems, offering the flexibility needed for quick adjustments and ease of maintenance.

Type C Lap Joint Stub End is designed with a standard flange face and a more straightforward taper compared to Type A and Type B. This type provides a conventional connection suitable for a wide range of applications where a standard stub end design is adequate. Type C Lap Joint Stub Ends are used with standard lap joint flanges, making them versatile and widely applicable in various piping systems.

ASME B16.9 / B16.28 Standards
MSS SP-43 Standards
DIN Standards
EN Standards
JIS Standards
BS Standards

ASME B16.9 Lap Joint Stub Ends Dimensions

ASME B16.9 Lap Joint Stub Ends Dimensions
Nominal Size Outside Diameter of Barrel Long Pattern
Length, F
Short Pattern
Length, F
Radius of
Fillet, R
Diameter
of Lap, G
NPS Max.
mm.
in.
Min.
mm.
in.
mm.
in.
mm.
in.
mm.
in.
mm.
in.
1/2 22.8
0.896
20.5
0.809
76
3.00
51
2.00
3
0.12
35
1.38
3/4 28.1
1.106
25.9
1.019
76
3.00
51
2.00
3
0.12
43
1.69
1 35.0
1.376
32.6
1.284
102
4.00
51
2.00
3
0.12
51
2.00
1 1/4 43.6
1.716
41.4
1.629
102
4.00
51
2.00
5
0.19
64
2.50
1 1/2 49.9
1.965
47.5
1.869
102
4.00
51
2.00
6
0.25
73
2.88
2 62.4
2.456
59.5
2.344
152
6.00
64
2.50
8
0.31
92
3.62
2 1/2 75.3
2.966
72.2
2.844
152
6.00
64
2.50
8
0.31
105
4.12
3 91.3
3.596
88.1
3.469
152
6.00
64
2.50
10
0.38
127
5.00
3 1/2 104.0
4.096
100.8
3.969
152
6.00
76
3.00
10
0.38
140
5.50
4 116.7
4.593
113.5
4.469
152
6.00
76
3.00
11
0.44
157
6.19
5 144.3
5.683
140.5
5.532
203
8.00
76
3.00
11
0.44
186
7.31
6 171.3
6.743
167.5
6.594
203
8.00
89
3.50
13
0.50
216
8.50
8 222.1
8.743
218.3
8.594
203
8.00
102
4.00
13
0.50
270
10.62
10 277.2
10.913
272.3
10.719
254
10.00
127
5.00
13
0.50
324
12.75
12 328.0
12.913
323.1
12.719
254
10.00
152
6.00
13
0.50
381
15.00
14 359.9
14.170
354.8
13.969
305
12.00
152
6.00
13
0.50
413
16.25
16 411.0
16.180
405.6
15.969
305
12.00
152
6.00
13
0.50
470
18.50
18 462.0
18.190
456.0
17.969
305
12.00
152
6.00
13
0.50
533
21.00
20 514.0
20.240
507.0
19.969
305
12.00
152
6.00
13
0.50
584
23.00
22 565.0
22.240
558.0
21.969
305
12.00
152
6.00
13
0.50
641
25.25
24 616.0
24.240
609.0
23.969
305
12.00
152
6.00
13
0.50
692
27.25

Tolerances for Lap Joint Stub Ends

Dimension Tolerance Purpose
Outside Diameter of Barrel ±1.5% of nominal diameter Ensures proper fit within the flange and consistent wall thickness.
Long Pattern Length (F) ±3 mm (±0.12 in) Guarantees alignment with the flange.
Short Pattern Length (F) ±3 mm (±0.12 in) Ensures proper fit in applications requiring a shorter connection.
Radius of Fillet (R) ±1 mm (±0.04 in) Provides a smooth transition at the weld joint.
Diameter of Lap (G) ±1 mm (±0.04 in) Ensures proper seating against the flange and effective sealing.
Wall Thickness ±10% of nominal thickness Maintains strength and durability of the stub end.
Concentricity and Straightness ±1 mm (±0.04 in) over length Ensures alignment and concentricity with the pipe or flange.

APPLICATIONS INDUSTRIES

Lap Joint Stub Ends are popular in industries like oil and gas, chemical processing, and power generation due to their flexibility and ease of maintenance. They allow for easy alignment and adjustment, making them ideal for systems requiring frequent disassembly or repositioning. This design simplifies installation and maintenance, reducing downtime and operational costs.

Oil and Gas Industry
Chemical and Petrochemical Industry
Power Generation
Water Treatment
Food and Beverage Industry
Pharmaceutical Industry
Pulp and Paper Industry
Shipbuilding and Marine Industry
HVAC - Heating, Ventilation, and Air Conditioning