OD = nominal outside diameter, in.Įxample 11.1 illustrates use of Eq. Pf! = burst pressure rounded to the nearest SO psi Y, = specified minimum yield strength, psi t = nominal wall thickness, in. The factor of 0,875 accounts for minimum wall thickness, *API Specification 5A, is calculated from Eq, 11.3. The burst rating of the casing is the amount of internal pressure that the pipe can withstand prior to failure. Pipe cannot be rejected until it has been drift tested when it is free of all foreign matter and properly supported lo prevent sagging.īurst. It must pass freely through the pipe with a reasonable exerted force equivalent to the weight of the mandrel being used for the test. Posted by Nessa on MaI like this better than other brands been buying. on MaThis one is perfect all the sanding bands I use fit perfect on it. The leading edge of the drift mandrel must be rounded to permit easy entry into the pipe. My favorite mandrel bit 5 My favorite Posted by Laura C. It is common practice to drift test the casing before it leaves the mill and immediately before running ii into the well.īach length of casing and lubing must be tested throughout iis entire length with a cylindrical drift mandrel conforming to the following requirements if the casing is to carry the API monogram (see Table 11-4). ![]() For drilling considerations, the drift diameter is usually considered as the bit size that can be safely run through the casing. The drift diameter is smaller than the ID due to eccentricity and nonstraight bore tolerances. Can also accomodate polishing and buffing accessories. Electric Drill Mandrel Bit is used to place the sanding bands on. The drift diameter of the casing relates to the diameter of a mandrel thai can pass through the easing bore without exerting unreasonable forces. Holds the sanding band in place and prevents slipping. LH Tooling CNC Lathe Tube Bending Mandrel 1.125 OD x. Maximum ovality, measured with a micrometer on the OD of the upscl, may not exceed 0.093 in.* Fw & r 30PCS Td Nose 3mm S Dd Md P G B, Fw & Dd P G D Bit + 2.3mm S. The eccentricity constraints on the bore of the upset with respect to the outside surface of the drillpipe may noi be more than '/ift in. from the end of the upset, may not exceed 0.093 in. The maximum eccentricity of the OD, measured with a saddle gauge at a distance of 5-6 in. ![]() The thickness tolerance is used in burst calculations.ĪPI Spec. Casing and Liners 8-Vh and smaller 9Vs to 13-Vs, inclusive 16 and largerĬourtesy American Petroleum Institute wall thickness, t, of the pipe body has a -12.5% tolerance.
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