Socket Weld Test Plugs
EST SQS socket weld test plugs provide a removable closure for hydrostatic testing of compatible socket weld fittings.
- Published sizes: 1/2–2 in. NPS (DN15–DN50).
- Designed for ASTM A105 Class 3000 carbon steel socket weld fittings.
- Up to 5,000 psig (approximately 345 barg), subject to size and application limits.
EST SQS socket weld test plugs fit into the socket of a compatible fitting. The grippers expand within the socket while the urethane seal closes the bore. This arrangement can avoid welding temporary pipe stubs and end caps solely to close the fitting for a hydrostatic test.
Fitting compatibility and pressure limits
The manufacturer lists 1/2–2 in. NPS (DN15–DN50) sizes for ASTM A105 Class 3000 carbon steel socket weld fittings. Confirm the actual socket dimensions, material and fitting class when selecting a plug.
The published family maximum is up to 5,000 psig (approximately 345 barg), depending on plug size. Class 3000 is a fitting designation, not permission to apply the same test pressure to every fitting or assembly. Use the limits for the exact plug and complete test system at the required temperature.
Selection chart
Use the chart as a selection reference and confirm the part number, connection and operating instructions with Justram.
Inspection and application support
Inspect the grippers, seals and fitting condition before use. Replacement grippers and seals can be identified by the supplied plug model. Follow the applicable installation and hydrostatic-test procedure; this page is a selection overview.
For the SQS operating instructions and literature, see the manufacturer’s test plug documentation library. For pipe-end testing outside a socket fitting, compare Justram’s test plug range.
Provide the fitting size, class, material, socket dimensions, test medium, pressure, temperature and quantity. Request an SQS socket weld test plug quotation.
