BS ISO 15363:2017 pdf free.Metallic materials – Tube ring hydraulic pressure test.
When a steel tape is used, friction shall be minimized by coating both the tape and test ring circumference with a suitable lubricant. Change in circumference shall be measured by a suitable mechanical or electrical device accurate to within ± 0,25 mm.
6.3 The equipment for measuring the increase in circumference shall be wrapped around the test ring before application of the internal pressure.
6.4 The tolerance for the measurement of internal pressure shall he within ± I %. Accuracy of the pressure measurement device shall be verified, for example by comparison with dead weight test equipment, at the commencement of a sequence of testing and not less than once per year during the testing period.
6.5 The rate of strain shall not exceed 0,2 % mm-1.
6.6 The pressure and circumferential extension output signals shall be recorded, for example on an X-Y plotter, and related to the test piece identity.
7 Hoop strength evaluation
7.1 A typical test pressure-circumferential extension record is shown in Figure 5.
7.2 The pressure p corresponding to the specified total circumferential strain shall be determined
from the test record.
7.3 For tubes where d/a 20, the hoop strength at the specified total strain shall be calculated from the formula.
For tubes with d/a < 20, the hoop strength calculated from this formula becomes increasingly inaccurate and quantitative results should be used with caution. Factors such as strain hardening could have a significant effect on the validity of the calculated strength.
NOTI€ The specified total circumferential strain is calculated from the circumferential extension divided by the original test ring circumference.
The test report shall contain at least the following information:
a] reference to this document, i.e. ISO 15363;
b) identification of test ring, e.g. cast number/tube number /identification number;
c} material specification, if known;
d] diameter and wall thickness of the tube;
e) length of the tube test ring;
f) calculated hoop strength at specified total circumferential strain;
g) reference to an alternative test method used, when appropriate (see Annex A).BS ISO 15363 pdf free download.
Tags: Metallic materials
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