Page 47 - Pipeline Rules of Thumb Handbook

2: Construction

Project Scoping Data ............................................ 35 Determine length of a pipe bend ...................................................... 47
Project scoping data worksheet for major facilities .......................... 35 Length of pipe in arc subtended by any angle.................................. 47
Right-of-Way .......................................................... 36 Average pipelay table—Underground ............................................... 48
How to determine the crop acreage included in a right-of-way Average pipelay table—On supports ................................................. 49
strip .................................................................................................. 36 Allowable pipe span between supports.............................................. 49
Clearing and grading right-of-way: labor/equipment How engineers make pipe fit the ditch ............................................. 50
considerations.................................................................................. 36 Pipe Lowering ....................................................... 53
Estimating manhours for removing trees.......................................... 37 How to lower an existing pipeline that is still in service.................. 53
Estimating manhours for removing tree stumps............................... 37 Welding .................................................................. 56
Clearing and grading right-of-way ..................................................... 38 When should steel be preheated before welding?............................ 56
Ditching ................................................................. 39 Welding and brazing temperatures.................................................... 57
How many cubic yards of excavation in a mile of ditch? ................. 39 Mechanical properties of pipe welding rods..................................... 57
Shrinkage and expansion of excavated and compacted soil ............. 39 Lens shade selector............................................................................. 58
Ditching and trenching: labor/equipment considerations ................ 39 Pipeline Welding ................................................... 58
Concrete Work ...................................................... 40 How many welds will the average welder make per hour?.............. 67
How to approximate sacks of cement needed to fill a form ............ 40 How much welding rod is required for a mile of schedule 40
What you should know about mixing and finishing concrete........... 40 pipeline? .......................................................................................... 67
Pipe Laying............................................................ 40 How many pounds of electrodes are required per weld on line
How to determine the degrees of bend in a pipe that must fit a pipe?................................................................................................. 67
ditch calling for a bend in both horizontal and vertical planes.... 40 Welding criteria permit safe and effective pipeline repair............... 68
How to bend pipe to fit ditch—sags, overbends and combination Cross country pipeline—vertical down electrode consumption,
bends................................................................................................ 41 pounds of electrode per joint......................................................... 74
Pipe bending computations made with hand-held calculator.......... 41 Guidelines for a successful directional crossing bid package........... 74
Calculate maximum bend on cold pipe............................................. 46

34