46 C.F.R. Subpart 56.90—Assembly
Title 46 - Shipping
(a) The assembly of the various piping components, whether done in a shop or as field erection, shall be done so that the completely erected piping conforms with the requirements of the regulations in this subchapter and with the specified requirements of the engineering design. (a) All flanged joints shall be fitted up so that the gasket contact faces bear uniformly on the gasket and then shall be made up with relatively uniform bolt stress. Bolt loading and gasket compression need only be verified by touch and visual observation. (b) (Reproduces 135.2.2.) In bolting gasketed flanged joints, the gasket shall be properly compressed in accordance with the design principles applicable to the type of gasket used. (c) Steel to cast iron flanged joints shall be assembled with care to prevent damage to the cast iron flange in accordance with §56.25–10. (d) (Reproduces 135.2.4.) All bolts shall be engaged so that there is visible evidence of complete threading through the nut or threaded attachment. (a) Any compound or lubricant used in threaded joints shall be suitable for the service conditions and shall not react unfavorably with either the service fluid or the piping materials. (b) Threaded joints which are to be seal welded shall be made up without any thread compound. (c) Backing off to permit alignment of pipe threaded joints shall not be permitted.
Title 46: Shipping
PART 56—PIPING SYSTEMS AND APPURTENANCES
Subpart 56.90—Assembly
§ 56.90-1 General.
§ 56.90-5 Bolting procedure.
§ 56.90-10 Threaded piping (reproduces 135.4).
