All process and utility piping shall be located above grade where possible. Installation of piping in trenches shall require approval of the Engineering Department.
All piping shall be routed for the shortest practical run but, shall include a sufficient number of fittings for expansion, flexibility and access by personnel and maintenance equipment. Pockets shall be avoided in all lines where possible.
All lines inside process unit limits shall preferably be run side by side on overhead pipe supports. Lines outside process unit limits may be run on sleepers.
Branch connections shall normally be at a 90 degree intersection to the run pipe. 45-degree laterals for uses other than branch blow down and relief lines shall normally be avoided. In no case shall a welded branch connection be designed with an intersecting angle of less than 45 degrees.
All piping shall be arranged to facilitate support. Where possible, all lines shall be run at elevation intervals which would enable them to be supported on common structural steel supports.
Control valves. Pressure-relief valves and instrumentation devices shall be accessible from platforms or grade and grouped at main operating levels.
Lines carrying molten solids or materials of high viscosity shall be self-draining.
Consideration shall be given to providing flexibility in the piping at storage tanks to allow for future tank and piping settlement.
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