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I want to use 1/2 inch SS316 tube in my high pressure &
temperature (64 kg/cm2 & 500 deg C)after condensate pot in
pressure tranmistter.
1) Is it possible to use 1/2" ss316 tube in high pressure
and temperature line.
Tube manufacturer is local vendor.
2)On sarting the plant, We need to do system fluse that
time condesate is not in the condesate pot so steam is
directly contact with the tube. We have no exact
calculation to know our tube is ok or nor at this time.
pleae,reply.
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Answer Posted / carl_ellis
1) Tubing comes
- in different wall thicknesses and the pressure rating
varies with wall thickness.
- in different material grades of stainless steel. The
pressure rating can vary with material
Your vendor should be able to supply the rating of the
tubing as determined according to a national standard like
ASME B31.1 and ASME B31.1 Process Piping from which
allowable working pressures are calculated from an S value
of XX,XXX psi (YYY.YY MPa) for ASTM A269 tubing at –20 to
100°F (–28 to 37°C), as listed in ASME B31.3 and ASME B31.1.
A factor (different factor for different temperatures) is
used to calculate the reduced maximum pressure at elevated
temperatures.
An example is provided in the Swagelok tubing catalog on
pages 2 and 3 for their tubing (not your tubing).
http://www.swagelok.com/downloads/webcatalogs/EN/MS-01-181.PDF
You need to run the calculation for your vendor's tubing.
2) You need to refill the tubing and condensate pots with
water after the flush but before steam is applied, otherwise
the steam will damage the transmitter.
Carl Ellis
Measure First
64Kg/cm2 = 910 psig
500 Deg C = 932 Deg F
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