Wings union (WECO type)

Raccord a frapper weco

Wing unions swivel joints have been used in the oilfield services for almost a century.
Originally branded under the Weco® names, the wing unions swivel joints have built a worldwide reputation with generation to generation of field operators.

The Weco® names have developed into generic terms for the products themselves, after so many years usage, rather than an individual brand or manufacturer.
The applied technologies of wing unions & swivel joints have proven their high level of efficiency in extremely severe flow conditions such as very high pressure & flowrates, high & low temperatures, multiphase flow, erosive and corrosive agents, vibration in pumping piping  systems, etc.
Wing unions are also often referred to as hammer unions, hammer lug unions or Weco® dependent upon the customer or manufacturer.
Whatever name is used, they are the most common quick connection method for joining piping components together in a temporary system.

Male & Female subs

Weco montage

They are the pressure containing parts of the assembly that provide metal-to-metal primary seal.

Subs are manufactured per different assembly modes:
    Butt weld assembly
    NPT threaded assembly
    NPST threaded assembly
    Sub profiles are also machined / forged as an integral part of a piping element.

Nut :
This is a forged part of assembly that allows connection of the two subs through a specific Acme or Iso thread.

Seal Element :
Seal element is an elastomer component which acts as a secondary seal to protect metal-to-metal seal against corrosion.
Depending on the union figure it can be a lip type ”Seal Ring” or an ”O-Ring”.
Different materials are available to suit fluid service (Buna for Standard service or FKM for H2S service).


Union weco type 50

Recommended service :
Suction service and very low pressure.
Main characteristics :
- Max pressure: 500 PSI STD & H2S service
- Working T: -20°F / 250°F
- Thread: ACME
- End connection: NPT Thread
- Sealing system : Metal to metal + o-ring on male side
- Material: A105 / A350 LF2 Mod

Weco type 50 coupe weco filete joint

General dimension FIG. 50 - NPT Thread
Part N° Nominal pipe size (inch) A (mm) B (mm) øOD (mm) Weight (kg)
Union weco 50 - 4" NPT 4" 152,4 130,3 151 12,5
Union weco 50 - 5" NPT 5" 142,7 130,3 151 10

All specifications are given as an indication, they may be modified in the interest of our customers.
Note: the operating temperature depends on the type of elastomer used.

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