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9.5 Various Designs for Cylindrical Specimens:
9.5.1 A number of off-the-shelf devices may be suitable for forming crevices on cylindrical specimens; examples include, O-rings, packings, nylon ferrule and sleeve type compression fittings, PVC compression fittings with rubber glands, plastic or nylon hose clamps, etc.
9.5.2 Crevice formers have also been fashioned from cut lengths of flexible vinyl type or rubber tubing to form sleeves which can be snugly fitted to the specimen outer surface.
9.5.3 The use of pipe and/or tubing samples with the above mentioned sleeves and compression fitting can facilitate testing under dynamic flow conditions. This can be accomplished by using the devices to join, end-to-end, a series of specimens in a continuous line or loop. Additional clamping may be necessary.
9.5.4 An attempt should be made to minimize variability by selecting test specimens with common dimensions, and by sizing the crevice former to approximate the specimen OD.

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