Features and Benefits
- Widest selection in the oilfield
FMC offers the most complete line of standard service and sour gas wing unions with sizes ranging from 1- to 12-inches in diameter with working pressures up to 20,000 psi. Unions are available with line pipe or tubing threads, butt-weld, or nonpressure-thread seal end connections.
- Positive sealing designs
Weco wing union seals vary according to pressure and application. All wing unions provide positive, pressure-tight sealing.
- Fast make-up and break-out
Three-lug nuts and rugged self-locking ACME threads provide fast make-up and break-out regardless of position or space restrictions. No special tools are required.
- Simple Identification
Weco standard service wing unions are color coded for quick identification.
- Interchangeable parts
All Weco parts of the same size, pressure rating, and figure number are interchangeable.
- Rigid quality control
Weco unions are produced using the finest raw materials, tooling procedures, and heat-treating techniques available. Each union is carefully inspected to assure long, dependable service in the most extreme conditions.
Weco® Original Wing Unions
Figure 100

1,000 psi (69 bar) cold working pressure
Recommended service: Manifold and line connections
Features: Pressure-tight make-up with hammer, economical low-pressure union
Figure 200

2,000 psi (138 bar) cold working pressure
Recommended service: General-service manifolds and lines
Features: Economical, general-purpose union, 1- to 4-inch sizes, butt-weld available
Figure 206

2,000 psi (138 bar) cold working pressure
Recommended service: Manifold and line connections, suction service, and corrosion service
Features: O-ring in male sub improves sealing and protects metal-to-metal seal against corrosion, replaceable O-ring extends union service life, 1- to 10-inch sizes
Figure 207

Blanking union, 2,000 psi (138 bar) cold working pressure
Recommended service: To seal manifold connections and protect union threads
Features: Parts are interchangeable with Figs. 200 and 206, O-ring on blanking cap ensures a leak-free seal, Raised lugs on cap allow for make-up with a hammer, Available in butt-weld, Cap can be tapped for pressure gauge if specified
Figure 211

Insulating union, 2,000 psi (138 bar) cold working pressure
Recommended service: For production systems with electrolytic corrosion problems
Features: Laminated insulating rings eliminate all metal-to-metal contact; insulating rings provide 35 million ohms resistance across the union, O-ring in male sub provides a positive primary seal, Seal ring in female sub provides a positive secondary seal, Insulating rings, O-ring, and seal ring can be replaced to extend union life
Figure 400

4,000 psi (276 bar) cold working pressure through 4-inch sizes;
2,500 psi (172 bar) cold working pressure, 5- through 12-inch sizes
Recommended service: Manifold and line connections, pump suction, and mud service
Features: 2 1/2- through 12-inch sizes have O-rings for primary seal, Butt-weld available, Available for sour gas service: 2,500 psi (172 bar) cold working pressure, 5- through 12-inch sizes; 4,000 psi (276 bar) cold working pressure, 1- through 4-inch sizes
Figure 600

6,000 psi (414 bar) cold working pressure
Recommended service: Steam service, boiler connections, manifold, and line connections for production, drilling and well servicing
Features: Bronze seat provides primary seal; will not rust in water services
Figure 602

6,000 psi (414 bar) cold working pressure
Recommended service: Manifold and line connections and mud service
Features: Compact, Replaceable, lip-type seal provides primary seal, protects secondary metal-to-metal seal, and minimizes flow turbulence, Butt-weld available, Available for sour gas service: 6,000 psi (414 bar) cold working pressure
Figure 1002

10,000 psi (690 bar) cold working pressure through 4-inch sizes;
7,500 psi (517 bar) cold working pressure, 5- and 6-inch sizes
Recommended service: Cementing, fracturing, acidizing, testing, and choke-and-kill lines
Feature: Replaceable, lip-type seal provides primary seal, protects secondary metal-to-metal, and minimizes flow turbulence, Butt-weld available, Available for sour gas service: 7,500 psi (517 bar) cold working pressure, 5- and 6-inch sizes have O-rings for primary seals
Figure 1003

Misaligning union, 10,000 psi (690 bar) cold working pressure, 2- and 3-inch sizes;
7,500 psi (517 bar) cold working pressure, 4- and 5-inch sizes
Recommend service: For high-pressure connections where lines cannot be aligned
Features: Ball seat provides positive seal with up to 71/2° misalignment; 2-inch model up to 4°, Replacement O-ring on male sub provides primary seal, and protects metal-to-metal seal against abrasion and corrosion, Available with threaded or butt-weld ends
Figure 1502

15,000 psi (1034 bar) cold working pressure
Recommended service: Cementing, fracturing, acidizing, testing, and choke-and-kill lines
Features: Replaceable, lip-type seal provides primary seal, protects secondary metal-to-metal seal, and minimizes flow turbulence, Butt-weld available, Available for sour gas service: 10,000 psi (690 bar) cold working pressure; buttweld or nonpressure-thread seal configurations only
Figure 2002

20,000 psi (1380 bar) cold working pressure
Recommended service: Cementing, fracturing, acidizing, testing, and choke-and-kill lines
Features: Replaceable, lip-type seal provides primary seal, protects secondary metal-to-metal seal, and minimizes flow turbulence, 2- and 3-inch line sizes, Butt-weld configurations only
Figure 2202

15,000 psi (1034 bar) cold working pressure
Recommended service: Especially designed for sour gas service
Features: Meets National Association of Corrosion Engineers Standard MR-01-75 and American Petroleum Institute RP-14E, Heat-treated components are 100% tested for hardness, Fluoroelastomer seal rings, Butt-weld only, Stamped “sour gas” using low-stress dot stamping and painted with a green zinc-chromate primer to assure quick identification
Download FMC Weco® Wing Union Catalog for more details and specifications.