Hydrostatic Stress Board (HSB)

HYDROSTATIC STRESS BOARD: The primary functions of the Hydrostatic Stress Board (HSB) of PPI are to issue recommendations to industry regarding the strength of thermoplastic piping materials intended for pressure applications, and to develop appropriate policies and procedures for the conduct of this activity. Since 1958, the HSB has worked as a volunteer group under PPI's auspices to define appropriate test procedures and issue recommendations for long-term strength. The HSB's recommendations are often referenced by North American plastics piping standards for the qualifying of thermoplastic piping materials for pressure piping service, and for the establishment of pipe pressure ratings.