• Instrumentation

  Instrument Installation Principles

  Posted by Chaitanya on July 16, 2020 at 12:49 pm

  Pressure sensing instruments that can be clogged due to high viscosity fluids or hydrates or if the
  measurement can be affected by other factors, shall be equipped with chemical seals.

  Pressure instruments shall have individual process isolation valves.

  Combined solutions may be used when not causing operational disadvantage/safety reduction during
  service of instruments etc.

  Each pressure instrument with process connection shall be fitted with an instrument block /bleed
  manifold (2/5 – way valve).

  Full functional independence between control and safety devices shall be assured, including
  vessel/pipeline connections (e.g. common pressure tap for control and safety devices shall not be
  used).

  The use of combined manifolds for piping and instrument valves shall be evaluated.

  Combined
  manifolds should be used when instruments are direct mounted on or in the immediate vicinity of the
  pipe/vessel.

  Package suppliers shall terminate hydraulic and pneumatic tubing at skid edge with bulkhead male
  connectors or unions.

  Package suppliers shall terminate instrumentation cables in junction boxes at skid edge or at agreed
  termination point.

  If safety and functional requirements are fulfilled, the following shall apply:

  Field instrument process connection: 1/2 ” NPT ref. ANSI/ASME B1.20.1.

  Field instrument pneumatic connection : 1/4 ” NPT

  Field instrument hydraulic connection: 1/2″ NPT

  Field instrument cable entry: ISO threads – size depending on cable size.

  Chaitanya replied 4 years, 9 months ago 1 Member · 0 Replies
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