Recent Blog Posts

Relief Valves Discharging Back into a Refrigeration System

March 18th, 2025

This is an update to a blog that was originally posted on 4/19/16. You can read the original blog here. ANSI/IIAR 2-2021 §15.3.10 outlines the requirements for providing Hydrostatic Overpressure Protection. In situations where thermal hydrostatic expansion of trapped liquid ammonia could occur, hydrostatic protection must be provided. Per ANSI/IIAR 2-2021 §15.3.10.1, Protection against overpressure […]

Relief Valve Orientation

May 28th, 2019

One often overlooked aspect of relief valve installation is valve orientation. Many refrigeration professionals are not familiar with the 2017 ASME B&PV Code Section VIII Appendix M-11 recommendation that “Spring-loaded safety and safety relief valves normally should be installed in the upright position with the spindle vertical. Where space or piping configuration preclude such an […]