A NEW range of closures has been introduced by GD Engineering of Worksop, UK. Claimed to be inherently safe, the low-cost Rotalock closures are intended for quick and frequent access to smaller-diameter and lower-pressure vessels. Typical applications are said to include filters, manways, meter provers, scraper traps, blowdowns, strainers, separators, and waste disposal vessels. The Rotalock's pressure-warning screw (PWS) is a key feature. It has an integral pin that penetrates through both locking elements in the hub and cap. When the screw is unscrewed, it warns the operator of internal vessel pressure before the cap is rotated, and complete withdrawal of the PWS also removes the locking pin so that the cap can be rotated and removed in total safety. The PWS does not, however, function as a blowdown valve.
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