De: Juan Montemuiño [jmontemuino@grupocobra.com]Enviado: Jueves, 04 de Febrero de 2010 11:26 Para: ELADIO ANTONIO APABLAZA HERNANDEZ; ERWIN ANDRES HEVIA RETAMAL; HERNAN JOSE MENDEZ BERMUDEZ; JOSE HUMBERTO ARANDA PERNIA; MARCO ANTONIO VERA GAMBOA; NILO ANDRES ARAYA GONZALEZ; PALEMON ARNOLDO PIZARRO HUIDOBRO; PILAR SOFIA GIRON RAMIREZ; RICARDO ALFREDO CARVAJAL GONZALEZ; SERGIO ANDRES ARANCIBIA GARCIA CC: 'Joaquin Romero'; 'Jesus Villar'; Andrea Ocaranza Asunto: CTA-COBS-SALFA-048/10: TABLA PARES DE APRIETE PARA BOP Importancia: Alta Estimados, Adjunto tabla de aprietes para los embridamientos del BOP. Los valores aquí indicados son orientativos y es responsabilidad de Salfa el asegurar el correcto par de apriete que dependerá de las condiciones de montaje,empaquetaduras empleadas, etc..

VI.   INSTALLATION PROCEDURE         D.   Bolt Tensioning Torque Requirements                   b.   The torque values should be uniformly applied at each step.                   c.   After achieving the required bolt stress, final tightening may be made at the required torque in a clockwise bolt-to-bolt sequence.                   d.   The procedure in steps a through c is to be used, in conjunction with instructions from the manufacturer of the torque wrench, for torquing

flanged joints.  Torque values for each bolt diameter are shown in Table 1.  

    Notes for Table 1:         1.   Table 1 shall be used for SA 193-B7, SA 193-B16 bolts, and flange material having the same thermal coefficient or expansion as the bolts.         2.   Reduce bolt load and wrench torque specified in Table 1 by a factor of .44 for SA 193-B8 C1.  1 bolting.         3.   Reduce bolt load and wrench torque specified in Table 1 by a factor of .80 for SA 453-GR 660 bolting.  

     4.   Bolt load specified in Table 1 produces theoretical stress of about 3870 kg/cm2 in bolts which will result in actual stress of 3165 kg/cm2 due to frictional losses and relaxation. Un saludo Juan A. Montemuiño Ayaso COBRA PLANTAS INDUSTRIALES Supervisor de Construcción Mecánico Móvil: (+34) 689189622 Móvil Chile: (+56) 989208893 e-mail: jmontemuino@grupocobra.com

                                        TABLE 1 Bolt Diameter

Inches Wrench Torque

Kg.m Bolt Load

KgBolt Diameter

InchesWrench Torque

Kg.mBolt Load

Kg3/4  26  7,535 1-3/4  381  49,3987/8  41 10,454 1-7/8  507  57,4811  63 13,747 2  558  66,162

1-1/8  90 18,163 2-1/4  806  85,3971-1/4 127 23,177 2-1/2 1116 107,0771-3/8 173 28,815 2-3/4 1501 131,2021-1/2 203 35,052 3 1957 157,7201-5/8 279 41,913      

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12-10-2010