Abstract
It is frequently necessary to drill a cross-bore through the wall of a cylindrical pressure vessel, and it tends to be taken for granted that the cross-bore—itself of circular section— should lie along a diameter of the main cross-section. The weakening effect of such a hole is well known, and reduces the safe working pressure down to 2/5 of the value for the undisturbed cylinder in the case of a Tresca material, or nearly down to 1/3 in the case of a von Mises material. The paper shows how it is possible to reclaim a large proportion of the ‘lost’ pressure capacity by use of a cross-bore which is either elliptical in section, or, more conveniently, round but offset from a diametral centre-line. Such procedure could thus also greatly improve the fatigue life of the pressure vessel.
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