Piping Crossovers

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

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 interface together

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

Range

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

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

Piping Crossover 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® Union
Hubs (API 16A or clamp connector type)
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 Requirements

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.