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Pressure pipe spool with flanges and elbows (illustration)

Solution · Pressure piping

Pressure pipe spool fabrication – welded, examined, tested and traceable

Prefabricating pipe spools in the shop gives better welds, fewer site hours and a complete record of every joint. World Steel cuts, bevels, fits, welds, examines and pressure-tests spools from your isometrics – carbon, low-temperature and stainless steel – to the piping code of your project.

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B31.3 · B31.1
ASME piping codes
or EN 13480 · AS 4041
CS · LTCS · SS
Materials
A106 · A333 · A312 and equivalents
RT · UT · MT · PT
NDE
to the specified extent
1.5 ×
Typical hydrotest pressure
of design pressure, per code
Pipe spool (illustration)

Why prefabricate spools

Most of the welds in a piping system can be made in the shop – flat or rolled, under cover, with positioners and the right equipment. Only the field welds that join spools are left for site. That means better weld quality, faster installation and far fewer hours in hot, congested or remote locations.

Every spool is made from an isometric with weld numbers. Each weld is linked to its welder, its welding procedure, the heat numbers of the pipe and fittings, its examination results and the pressure test – the record your inspector and the plant owner need.

Aplicaciones

Spool fabrication scope

01

Cutting & bevelling

Machine cutting and bevelling to the joint design; branch connections and saddles.

02

Fit-up & welding

GTAW root and SMAW / FCAW / SAW fill to qualified procedures; purging for stainless steel.

03

Heat treatment

Post-weld heat treatment where the code and material require it, with temperature charts.

04

Examination

Visual, MT/PT, RT or UT to the specified percentage; PMI for alloy materials when required.

05

Pressure testing

Hydrostatic or pneumatic tests to the code, with calibrated gauges and test records.

06

Finishing

Blasting and painting or pickling and passivation; flange protection, end caps and marking.

Normas y cumplimiento

Piping codes

The code in your specification governs.

United States

  • ASME B31.3Process piping
  • ASME B31.1Power piping
  • ASME Section IX · Section VWelding qualifications; non-destructive examination
Todas las normas de United States →

Europe

  • EN 13480Metallic industrial piping
  • ISO 15614-1 · ISO 9606-1Welding procedure and welder qualification
  • EN 10204Inspection documents
Todas las normas de Europe →

Australia

  • AS 4041Pressure piping
  • AS/NZS 3992Pressure equipment – welding and brazing qualification
Todas las normas de Australia & New Zealand →

Resumen solo orientativo: prevalecen la especificación del proyecto, la edición del código adoptada y la autoridad competente.

Spool welds (illustration)

Traceability

Every weld on record

The spool data book contains the isometrics with weld maps, material certificates (EN 10204 3.1), welding procedure specifications and qualification records, welder qualifications, NDE and PWHT reports, pressure test certificates and coating records. Read more about our quality control.

Materials

Typical piping materials

Equivalents by standard – the piping class of the project decides.

Materials
ServiceASTM / ASMEEN
Carbon steelA106 Gr B · A53 Gr B · A234 WPB · A105P235GH · P265GH (EN 10216-2 / 10217-2)
Low-temperature carbon steelA333 Gr 6 · A420 WPL6 · A350 LF2P265NL · P355NL1
Stainless steelA312 TP304/304L · TP316/316L · A403 · A1821.4301 · 1.4307 · 1.4404 (EN 10216-5 / 10217-7)
Line pipe (structural use)API 5L Gr B / X52L245 · L360 (EN ISO 3183)

FAQ

Preguntas frecuentes

What is a pipe spool?

A prefabricated section of a piping system – pipes, fittings and flanges welded together in the shop – sized for transport and joined to other spools at site.

What hydrotest pressure is used?

Under ASME B31.3 a hydrostatic test is typically at least 1.5 times the design pressure, adjusted for temperature; other codes have their own rules. The test pressure is set by the piping engineer.

Do you supply third-party inspection?

Your third-party inspector is welcome at all hold and witness points of the ITP; we can also arrange an independent inspection body.

Send us your isometrics

We quote spool fabrication, examination, testing, coating and delivery.

Request a quotation +84 902 881 833