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SAC <br />twtM wa?rrs cowwu.rn. ac. <br />E <br />FA <br />PROJECT: JOB NO: SHEET-Z-OF-Z <br />Ar"a VLF 1125 <br />FEATURE: BY: DATE: <br />Riser Pipe Design AM 2/18/08 <br />DETAILS: CHID BY: DATE: <br />Shear Pins DTW 2120108 <br />Size and spec. shear pins for compression joint in riser. <br />For simplicity use carbon steel bolts. <br />Size bolts to support weight of riser steel casing + 25% for handling (dynamic) loods <br />Compression joint is located 15 feet below the top of the riser. <br />From Roscoe-Moss 4 Compression Joint Section: <br />24" O.D. x 0.375" W <br /> Each compression joint will have (2) sets of (4) shear pins <br />z5 t /a' O.D. x o.s" w RING but design for each set to support pipe weight. (e.g. 4 <br />(4) Shear Pine bolts not 8 hold the pipe weight.) <br />26" O.D. x 0.375" w From Roscoe-Moss Table: <br /> 24" O.D. x 23 1/4" I.D. pipe = 94.62 Ibs/ft <br />(4) Shear Pins <br />Weight at compression joint: F <br />15 ft * 94.62 Ibs/ft = 1,419.31bs <br />Shear pin design load: <br />1.25 * 1,419.3 Ibs = 1,774.1 Ibs <br />Each shear pin carries: <br />1,774.1 Ibs / 4 = 443.5 Ibs = 444 Ibs <br />T =shear stress = (4*F) / (n*d2) - - - - - - d <br />- - - - - - <br />T = (4 * 444lbs) / (n*d2) <br /> <br />Size for SAE J429 Grade I Bolts / Studs t <br />Yield Strength = 36,000 psi F <br />36,000 psi = (4 * 444lbs) / (n*d2) <br />d = 0.125" <br />0