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3109F.2 Oil Piping and Pipeline Systems
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All pressure piping and pipelines for oil service shall conform to the provisions of API Standard 2610 [9.1], ASME B31.3 [9.2] or B31.4 [9.3] as appropriate, including the following:
- All piping/pipelines shall be documented on current P&ID's (N/E).
- Piping and pipeline systems shall be installed above deck (N).
- The systems shall be arranged in a way not to obstruct access to and removal of other piping components and equipment (N).
- Flexibility shall be achieved through adequate expansion loops or joints (N/E).
- A guide or lateral restraint shall be provided just past the elbow where a pipe changes direction in order to minimize excessive axial stress (N).
- Piping shall be routed to allow for movement due to thermal expansion and seismic displacement, without exceeding the allowable stresses in the supports, and anchor connections (see Section 3109F.3) (N/E).
- Plastic piping shall not be used unless designated for oil service (N/E).
- If a flanged connection exists within 20 pipe diameters from the end of any replaced section, the pipe shall be replaced up to and including the flange.
- Pipelines shall be seamless, electric-resistance-welded or electric-fusion-welded (N).
- Piping greater than 2 inches in diameter shall be butt-welded. Piping 2 inches and smaller shall be socket welded or threaded.
- Pipeline connections directly over the water shall be welded (N). Flanged connections not over water shall have secondary containment (N).
- Pipelines that do not have a valid and certified Static Liquid Pressure Test (SLPT) [9.4] shall be marked "OUT OF SERVICE." Out-of-service piping and pipelines shall be purged, gas-freed and physically isolated from sources of oil.
- If a pipeline is "out-of-service" for 3 or more years, it will require a valid and certified Static Liquid Pressure Test (SLPT) and API 570 inspection [9.4] prior to Division approval for re-use (E).
- New piping and pipeline systems require a valid and certified Static Liquid Pressure Test (SLPT) [9.4] and Division approval, prior to operation.