Retardation effect of the hydrostatic test on the subsequent crack growth in an AISI 4130X steel gas cylinder has been predicted. The post-test retardation period depends upon the size of the crack; the smaller the crack size the larger the crack growth retardation period. The beneficial effect of the present recertification test, conducted at 5-yr interval at a pressure of 1.67 times the design service pressure, depends upon the number of pressure cycles incurred between retests.

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