Figure 2202 Hammer Union — Butt Weld, Sour Gas Service, 15,000 psi

The Figure 2202 is the sour gas union of the 2002 family, rated 15,000 psi and built to the requirements of NACE.

Applications

Sour gas service at 15,000 psi. Butt weld only.

Construction and sealing

• Lip-type elastomer seals with stainless steel anti-extrusion rings, fitted as standard.
• Every H2S service union is examined against the current requirements of NACE, the National Association of Corrosion Engineers.
• Butt weld ends only.
• Sealing: Lip-type elastomer seal with stainless steel anti-extrusion ring.

Working pressure

15,000 psi (1,034 bar) cold working pressure.

The 3 in and 4 in Figure 2202 are called 2.5 in and 3 in by some other manufacturers. Check the bore against the weld prep dimensions in the table below before ordering.

Sour gas service unions are supplied in H2S trim and are rated below the standard service union of the same figure number wherever the source publishes a separate H2S rating. Confirm the service class, the trim and the certification you need on your enquiry - we quote against the line specification.

How a hammer union makes up

A hammer union is a three-piece connection. A male sub and a female sub carry the two line ends, and a wing nut turns on a thread cut into the male sub and pulls a shoulder on the female sub down onto the seat. The lugs standing proud of the nut are struck with a hammer to tighten it, which is where the name comes from — the joint is made up and broken out with a sledgehammer rather than a wrench, so a line can be rigged and stripped quickly in the field. The seal is made by the seat, not by the thread: the nut only supplies the load that holds the two seating faces together. That is why a union will leak from a scored seat or a perished seal long before the thread is at fault, and why a worn union is usually a sub or a seal replacement rather than a scrap part.

Specifying one

Four things fix a hammer union: the figure number, which sets the pressure class and decides what it will mate with; the service class, standard or sour gas; the end connection, threaded or butt weld; and the nominal size. Figure numbers are an industry series, so a union of the same figure and size from another maker will mate — but the pressure rating stamped on the union is what governs, not the figure number on its own. Send us the line specification and we will confirm the match before quoting.

Sizes and part numbers

Published in 2" to 6" with butt weld ends. Every orderable size, its weight, its dimensions and its working pressure are in the size table on this page. Where dimensions and weight are critical, ask us to confirm them against the build before you order.