Design, Specification, & Installation

Long-Term Performance of Corzan^® Piping Systems Under Pressure

The long term performance of Corzan^® piping systems under pressure is tested in accordance with ASTM D 1598, Test Method for Time-to-Failure of Plastic Pipe Under Constant Internal Pressure. Typical data obtained from pipe made from Corzan CPVC is shown below. Data is obtained up to 16,000 hours. The data is evaluated in accordance with ASTM D 2837, Standard Method for Obtaining Hydrostatic Design Basis for Thermoplastic Pipe Materials. The hydrostatic design basis (HDB) is the extrapolated value of the hoop stress at 100,000 hours. The hydrostatic design stress (HDS) is taken as 50% of the HDB. The pressure ratings for specific pipe sizes are calculated from the HDS with the following formula:

P =	2St D-t
Where	P = pipe pressure rating
	S = hydrostatic design stress (HDS)
	t = pipe wall thickness
	D = pipe outside diameter