Instrument Piping and Tubing QAQC Questionnaires
PIP 18.104.22.168 Interconnecting instrument piping (tubing) between the primary metering
element and the measuring instrument shall be 0.5 inch AISI Series 300 stainless
steel tubing minimum. Tubing wall thickness shall be 0.89 mm (0.035 inch)
minimum. Applicable piping code and process requirements shall prevail.
PIP 22.214.171.124 Interconnecting piping shall be limited to a maximum length of 6 m (20 ft) for
meters in control loops. Interconnecting impulse tubing between a differential
flow element and a transmitter in compressor suction service shall be kept as
close as possible or close coupled.
PIP 126.96.36.199 Interconnecting Seal liquid to protect flow meter impulse tubing and secondary
measurement instrumentation from corrosive fluids or to provide a stable
hydraulic measuring medium shall be free flowing but not volatile under normal
process and external ambient conditions. Seal liquids shall not be miscible with
nor react with the process fluid being measured. Seal liquids shall be selected so
that their potential for contamination of the process fluid is acceptable.
PIP 188.8.131.52 (Addition) PIP PCIDP000 “Differential Pressure Installation Details” shall be used
for interconnecting the flow Differential Pressure Instruments to the root valves
of the differential producers.
PIP 4.6.2.c (Addition) Purging of impulse lines shall be considered only if other methods
have failed to eliminate problems of condensation, vaporization, corrosion or
8.1.1 Pressure and D/P instruments in liquid or condensable vapor service shall be selfventing
(i.e., mounted below the process connections) with all impulse lines
sloping downward approximately 1:10 minimum toward the instrument.
Pressure and D/P instruments in gas service shall be self‐draining (i.e., mounted
above the process connections) with all lines sloping downward approximately
1:10 minimum toward the process connection.
8.3 Instrument Piping and Tubing
The instrument piping and tubing installation shall ensure the reliable and
accurate operation of the instrument(s) involved, and allow sufficient access for
maintenance, calibration and testing. It shall be possible to test all alarm and
shutdown initiating devices, without interfering with the process operation of
the packaged unit.
Instrument tubing shall be adequately supported to eliminate any vibration
transmission to the instruments or excessive load to the piping connection,
process line or vessel.
Tubing to and from non‐indicating instruments shall have a plugged tee or
equivalent test point for calibration and testing purposes.
All threaded connections shall be tapered per ASME B1.20.1.
All incoming and outgoing interconnection lines shall terminate in bulkhead
fittings. The lines shall be marked with the tag numbers of the corresponding
instruments. Bulkhead fittings shall be installed with adequate spacing to ensure
that any connection can be removed without the need to remove other fittings.
9.2.2 Tubing and Fittings
184.108.40.206 Tubing Stainless steel tubing shall be seamless, annealed, minimum
wall thickness 1.24 mm, per ASTM A269, Grade TP‐316L.
Instrument air tubing shall be ¼ inch, 3/8 inch, or ½ inch OD
stainless steel. Wall thickness shall be 0.75 mm or larger.
220.127.116.11 Fittings 316 stainless steel compression fittings shall be either Crawford
Swagelok, Parker Hannifin A‐Lok, Parker Hannifin Corp. CPI or
Hoke Gyrolock. Any proposal to use fittings other than those
listed above shall be reviewed by Supervisor, Instrumentation
Unit, Process Instrumentation Division, and P&CSD.
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