LOOSE FLANGE TYPE FLARED PIPE COUPLING, STEEL PIPE FOR THE LOOSE FLANGE TYPE FLARED PIPE COUPLING, METHOD FOR MANUFACTURING THE STEEL PIPE FOR THE LOOSE FLANGE TYPE FLARED PIPE COUPLING, AND METHOD FOR JOINING THE STEEL PIPE

摘要

PROBLEM TO BE SOLVED: To improve sealing performance when particularly an excessive external force is applied to a loose flange type flared pipe coupling.;SOLUTION: This loose flange type flared pipe coupling makes loose flanges 4 engaged with flare parts 2 formed by flange-processing the end of a steel pipe 1, causing the end surfaces of the flare parts 2 to abut on each other by interposing a gasket 3 comprising a non-asbestos joint seal, and also causing an abutment part to be sandwiched between the loose flanges 4 to be mechanically fastened, wherein a flare part end surface angle [] between the end surface of the flare part 4 and the center axis of the steel pipe 1 is 87-89. The excellent sealing performance is thus provided.;COPYRIGHT: (C)2010,JPO&INPIT