API RP 1177 pdf download Recommended Practice for Steel Pipeline Construction Quality Management Systems 5.6.18 Buoyancy Control5.6.18.1 General The organization shall maintain a procedure for buoyancy control. Buoyancy control should be performed where the pipeline has buoyancy forces approximately equal to orgreater than the surrounding soil/water environment. All phases of pipeline construction and life cycleshould be reviewed when calculating buoyancy;...