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:
where The yield pressure Py
and isotropic (fully plastic) yield pressure Piy are thus related
to the material yield strength
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, l
New 50K-psi pumps for water blasting. Contact
Mr. Vittorio Perregrini of FlowSwiss at [41]91-935-9191,
or perregrini@flowswiss.com for
quote. |
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