Pressure vessels should be easier to design than the structures described in chapter 8; their basic function is not to blow up or leak; a certain amount of yield is tolerated, this is described as shakedown. Moreover the shapes and details are highly standardised and well proven by previous service data and near full-size specimen tests. Weight as such is not critical. The pressure to economise, though laudable within limits, is aggravated by the custom of estimating cost for tendering purposes on a weight basis.
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