Fabricated Pipe Spools — Technical Data Sheet
Pipe spools are prefabricated sections of piping — pipe, fittings and flanges welded together in the shop — delivered ready to bolt or weld into place. Shop fabrication gives better weld quality and a shorter site schedule than field fabrication.
Specification
| Product | Shop-fabricated pipe spools, headers, manifolds, ducts and pipe supports |
|---|---|
| Supply | OEM manufacturer — fabricated by Teshi Group, India |
| Codes | ASME B31.3 Process Piping; ASME B31.1 Power Piping; IBR for boiler piping |
| Welding | SMAW, GTAW (TIG) and combinations; WPS / PQR and welder qualification to ASME Section IX |
| Size range | NPS ½" to 36"; larger ducts and fabricated fittings to drawing |
| Materials | Carbon steel, stainless steel and Cr-Mo alloy steel |
| Surface preparation | Blast cleaning to Sa 2½ and painting to the project specification; pickling and passivation for stainless steel |
Materials
| Pipe | ASTM A106 Gr.B, ASTM A312 TP304, ASTM A312 TP316, ASTM A335 P11, ASTM A335 P22 |
|---|---|
| Fittings | ASTM A234 WPB, ASTM A403 WP304, ASTM A403 WP316 |
| Flanges | ASTM A105, ASTM A182 F304, ASTM A182 F316 |
| Plate and structurals | IS 2062 E250 BR, IS 2062 E350 BR, ASTM A516 Gr.70 |
Typical applications
- Process plants, refineries and power stations
- Steel plant utility and gas piping
- Skid packages and modular plants
Manufacturing
- Review of isometrics and preparation of spool drawings, cutting plans and weld maps.
- Material identification and transfer of heat numbers before cutting.
- Cutting, bevelling, fit-up and welding to qualified procedures by qualified welders.
- Post-weld heat treatment where the code or material requires it.
- Dimensional check, NDT, hydrostatic test, cleaning, painting and tagging.
Inspection and testing
- Visual and dimensional inspection of every spool against the spool drawing.
- Radiography or ultrasonic examination of butt welds to the percentage specified.
- Dye-penetrant or magnetic-particle examination of fillet and socket welds.
- PMI on alloy and stainless welds and components.
- Hydrostatic or pneumatic test when specified; hardness survey after PWHT.
Marking
Each spool tagged and paint-marked with spool number, line number and heat numbers.
Documentation
Material test certificates, weld map with welder identification, WPS / PQR, NDT reports, PWHT charts, dimensional report, hydro test certificate and painting report.
Packing
Flange faces protected with plywood blinds, open ends capped, small-bore branches braced, and spools bundled or crated for transport.
Ordering information
Please state the following on your enquiry:
- Isometric or fabrication drawings
- Bill of materials with grades and schedules
- Applicable code and NDT percentage
- PWHT, painting and testing requirements
- Free-issue or Teshi-supplied material
- Delivery sequence and location
Reference information compiled from the published standard for convenience. It does not replace the current edition of the governing standard, which takes precedence. Verify critical dimensions and properties before design, purchase or fabrication. Teshi Engineers & Sales Promoters (P) Ltd accepts no liability for errors or omissions.
FAQ
Fabricated Pipe Spools: common questions
What is the largest spool you can fabricate?
Spools are sized for road transport — typically up to about 12 m long. Larger assemblies are split with field welds agreed at the drawing stage.
Related products, data sheets and standards
Ready to build to spec?
Share your drawing, bill of materials or technical requirements with the Teshi team.