Piping Crossovers

A crossover pressure rating is always the lowest rating of the two piping systems (or equipment rating).

Piping Crossovers

In any piping system there are always interface points between:

  • 2 different pressure ratings
  • 2 different pipe sizes
  • 2 different end connection types
  • …and some times, all three interfaces together!

Interfaces may be a critical and conflictual issue when it also interfaces between the scope of supply of different companies.


It is essential before you buy a crossover (X-over) to specify and anticipate all interface points you may need before starting a piping installation.

The following specifications shall be given:

  • fluid service (Standard, Sour gas, chemicals, etc.)
  • fluid & ambient temperature
  • pressure rating of both sides
  • connection type and size for both sides
  • codes and standards applicable to the design

Piping crossovers construction

  • Buttweld ends.
  • Threaded assembly.
  • Integral machined.
  • Material per fluid service (carbon steel, stainless steel).

Norms and Standards

  • NACE MR 01-75,  AINSI B16-5, B31-3, API 6A.
  • PED and CE compliance on request.
  • Other standards on request.

End Connections & Nominal Size

  • Wing union
  • Rego type Union
  • Hub API 16A
  • Clamp connector
  • Flange (ANSI B16-5 or API 6A)
  • Dry Disconnect Coupling
  • Guillemin Union
  • Camlock Union
  • Threaded Ends (NPT/LP, other threads on request)
  • Common sizes up to 6″

Special requirement can be studied such as

  • Ported crossovers
  • Manufacturing to a required bore or special I.D.
  • Special flow direction
  • Multi-direction flow (more than 2 ends)

Detachable nuts

Detachable nuts are used when fabrication mode doesn’t allow the insertion of standard nut onto integral body.

It can also be used when maintenance cost is concerned. The detachable nut kit consists of 1 replaceable nut, 3 segments and 1 retainer ring.

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