Quality Waterjet Newsletter 06/26/2007

Burst Pressure of High Pressure Tubing


In water blasting market, the tubing is not readily available and often requires special mill runs to user’s specification. Therefore it is necessary to predict the burst pressure for tubing with a certain length, size, and material. The maximum allowable working pressure can be determined thereafter. Thrash and Britton* did some analytical and experimental work in this regard. The tubing used in the water blasting is considered as thick-walled cylinder because the ratio of wall thickness to inner radius is greater than 0.1. The maximum stress is at the inner diameter of the tubing and consists of these three components: longitudinal stress S1, tangential stress (or hoop stress) S2, and radial stress S3, calculated as follows:




The yield pressure Py and isotropic (fully plastic) yield pressure Piy are thus related to the material yield strength  by:


The burst pressure was predicted by:     

Tests were done on seven different types of tubing. The actual burst pressure was compared to the calculated data. The working pressures was determined (see below).


*Thrash, Thomas and Britton, Charles (1999) Mathematical modeling of thick wall tubing, in Mohamed Hashish (ed.), Proceedings of the 10th American Waterjet Conference, August 14-17, Houston, Texas, Paper 74.



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