By Thoralf Skolem
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3–10. 3 Pig Designs so that increased propellant pressure is not required. The major task of the inner lips is sealing in pipe bends. In a curve, the internal lips lie on the pipe wall, while the outer, circular lips are no longer perpendicular to the pipe axis and thus present ellipses in projection. Depending on the wear of the lips a sickle-shaped gap can arise between the lips and the wall, particularly on the inner side of the pipe bend. 2 Multicomponent Pigs Pigs with Replaceable Lips Replaceable-lip pigs have a solid body made of plastic or metal and two replaceable flexible lips (Fig.
Although the test specimens do not fulfil the dimensional requirements of the standard, they can still be used since a qualitative result is sufficient for evaluating the material. The thickness of the sample should be > 6 mm. To attain this thickness a maximum of three specimens can be arranged in layers. DIN 53505 is not applicable to hardness measurements on foamed materials (AU). Since, however, for the evaluation of the resistance of pig materials only the change in hardness is of interest, a comparative measurement can be made.
Linear dimensions Mass Shore (A) hardness Ultimate tensile strength Since determination of the ultimate tensile strength is a destructive method, two sample sets are required. The first set is used for determining values 1–3 and is then contacted with the product. After the test period tests 1–4 are performed on sample set 1. Sample set 2 is exclusively used for determining the ultimate tensile strength before product contact. , Cu content). The storage vessels must be sealable to prevent evaporation and atmosphere exchange.
Abstract Set Theory (Notre Dame Mathematical Lectures 8) by Thoralf Skolem