scope:

Description

This assembly shall consist of a primary and secondary chamber. Each chamber shall contain an independent float-operated closure member. The primary chamber is the lower chamber. The secondary or upper chamber is redundant and will close in the event that the primary chamber fails to close. Other configurations achieving the performance requirements of this standard are acceptable.

Size Range and Connections

Sizes 1 to 4 NPS (25 to 100 mm) shall be furnished with an NPTF threaded connection. Sizes 6 to 16 NPS (150 to 400 mm) shall be furnished with a flanged connection

Pressure Range

The assembly shall be designed and constructed for an operating pressure range of 9.7 psia (66.9 kPa_absolute) to 25.0 psi (172.4 kPa).

Temperature Range

The assembly shall function at temperatures from 32.0 °F to 150.0 °F (0 °C to 65.6 °C).