Socket Weld Cap
Socket Weld Cap Manufacturer & Supplier
A Socket Weld Cap is a forged pipe fitting used to seal the end of a socket weld piping system. It fits over the end of a pipe and is permanently welded in place, providing a secure, leak-proof closure. It is typically used in small-bore, high-pressure piping systems up to 2 inches in size.
| Attribute | Description |
|---|---|
| Product Name | Socket Weld Cap |
| Definition | A forged pipe fitting used to seal the end of a pipe in a socket weld connection, preventing flow and protecting the pipe from contamination or damage. |
| Standards | ASME B16.11, BS3799, MSS SP-79, MSS SP-83, MSS SP-95, MSS SP-97 |
| Connection Type | Socket Weld (pipe is inserted into a recessed area of the cap and welded with a fillet weld) |
| Materials |
|
| Pressure Ratings | Class 3000, 6000, 9000 |
| Size Range | NPS 1/8″ to 4″ (6mm to 100mm), typically used for small-bore piping (NPS 2 or smaller for higher classes) |
| Dimensions | Per ASME B16.11 (socket bore, depth, and wall thickness vary by size and class; e.g., 1/16″ expansion gap required during installation) |
| Weight | Varies by size and class (e.g., Class 3000, 3/4″ cap weighs approx. 0.15–0.25 kg, depending on material) |
| Installation | Pipe end is cleaned, deburred, inserted into the cap’s socket, leaving a 1/16″ (1.6 mm) expansion gap, then welded using a fillet weld. |
| Advantages | – Secure, leak-proof connection – High durability – Compact design, no additional sealing compounds needed – Cost-effective compared to butt-weld fittings |
| Limitations | – Lower fatigue resistance than butt-weld fittings – Not ideal for corrosive/radioactive applications due to potential crevice corrosion |
| Packaging | Individually sleeved in plastic bags, packed in cartons or wooden cases, labeled with grade, size, and lot number for traceability. |
Socket Weld Cap Dimensions
Socket Weld Cap Dimensions Class 3000
| NPS | Socket Bore | Depth Socket | Length Cap | Dia Cap |
| B | J | Q | R | |
| 1/2 | 21.95 21.70 | 10 | 19 | 32 |
| 3/4 | 27.30 27.05 | 13 | 23 | 38 |
| 1 | 34.05 33.80 | 13 | 26 | 45 |
| 1.1/4 | 42.80 42.55 | 13 | 28 | 55 |
| 1.1/2 | 48.90 48.65 | 13 | 30 | 65 |
| 2 | 61.35 61.10 | 16 | 36 | 75 |
| 2.1/2 | 74.20 73.80 | 16 | 38 | 92 |
| 3 | 90.15 89.80 | 16 | 42 | 110 |
| 4 | 115.80 115.45 | 19 | 48 | 140 |
Socket Weld Cap Dimensions Class 6000
| NPS | Socket Bore | Depth Socket | Length Cap | Dia Cap |
| B | J | Q | R | |
| 1/2 | 21.95 21.70 | 10 | 22 | 34 |
| 3/4 | 27.30 27.05 | 13 | 26 | 41 |
| 1 | 34.05 33.80 | 13 | 28 | 50 |
| 1.1/4 | 42.80 42.55 | 13 | 30 | 58 |
| 1.1/2 | 48.90 48.65 | 13 | 32 | 66.5 |
| 2 | 61.35 61.10 | 16 | 38 | 85 |
Key Features:
Function: Closes the end of a pipe to stop flow.
Connection: Pipe is inserted into the socket and fillet welded around the perimeter.
Size Range: Commonly available from 1/2″ to 2″ NPS.
Pressure Ratings: Class 3000 / 6000 / 9000.
Advantages:
Ensures leak-proof pipe termination
Ideal for high-pressure and high-temperature applications
Compact and easy to install
Long-lasting and maintenance-free solution
Applications:
Oil & Gas industries
Chemical processing plants
High-pressure steam lines
Power generation systems
Hydraulic and instrumentation systems