ACT manufactures Hammer Unions from raw materials in the form of forgings or castings in accordance with service
requirements in sizes 1 to 12" with ratings up to 20,000 PSI cold working pressure. Unions for sour gas service are
manufactured in accordance with NACE MR-01-75 & API RP-14E.
ACT's Hammer Unions are interchangeable with WECO or other manufacturers adhering to the industry standards.
Acme thread and line pipe threads are gauged by standard plug & ring gauges.
The conical and spherical surfaces of the female and male subs respectively form an effective metal-to-metal seal in
case of low pressure services.
For medium pressure mostly an '0' ring is provided in the male sub in addition to the metal to metal seal. For high
pressure a lip type seal ring is provided for primary seal in the female sub. The seal protects the secondary metal to
metal seal from corrosion and limits fluid flow turbulence. For sour service applications viton seals are provided.
ACT unions are manufactured using modern manufacturing techniques to attain first class workmanship and
dimensional control. Correctly chosen raw materials for a particular service together with correct heat-treatment
process is used to ensure better service and longer life in extreme conditions.
1. Line pipe threads in Fig-1002, Fig 1502 for Pipe diameters above 4" are not' recommended for sour service
2. For Fig-1003, 4" & 5" sizes are rated at ,7500 PSI cold working pressure and 12000 PSI test pressure.
3. Sour gas service unions are painted OLIVE GREEN and stamped "NACE”.
4. For other types of threading like casing, tubing or NPS thread seal configuration, consult factory.