2.8
DESICCANT AIR DRYERS
Chamber of welded steel, [_____] kPa (gage) psig working pressure, ASME
labeled conforming to ASME BPVC SEC VIII D1, with flanged or threaded
fittings, and [manual] [automatic] drain valve. Manufacturer's recommended
desiccant in tablet form which will not nest or cake. Contractor shall
provide a supply of desiccant for initial operations in unbroken shipping
containers equal to not less than four charges of desiccant for the dryer.
2.9
HIGH PRESSURE (HP) AIR PIPING AND ACCESSORIES
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NOTE: The high pressure air system materials listed
are tentative suggestions. The designer shall
calculate required minimum wall thicknesses for pipe
and tube in accordance with ASME B31.1 and verify
adequacy of the materials listed. Select material
for corrosion resistance required in the service
environment. Allowance for corrosion or
fabrication, factor "A" in ASME B31.1, paragraph
104.1, shall be selected by the designer. If carbon
steel is selected as the piping material, special
attention should be given to the corrosion allowance
for the higher pressures such as 20,682 kPa (gage)
3000 psig and 34,470 kPa (gage) 5000 psig systems
since commercial sizes per ASME B36.10M would not
permit selection of large corrosion allowance
factors.
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2.9.1
HP Air Piping and Tubing
HP air piping and tubing for 34,470 kPa (gage) at 38 degrees C 5000 psig at
100 degrees F system shall conform to the following:
a.
Stainless steel pipe: ASTM A 312/A 312M, seamless stainless
steel, annealed Type [304L] [316L], Schedule 160 up to 25 mm one
inch IPS, double extra strong (XXS) for 32 to 65 mm 1 1/4 to 2 1/2
inches IPS [,larger sizes shall be special as indicated]. Wall
thickness "schedule" and "weight" designations shall conform to
ASME B36.10M. Fittings for pipe 40 mm 1 1/2 inches IPS and
smaller: ASTM A 403/A 403M, ASME B16.11, forged stainless steel,
Type [304L] [316L], socket welding, Class 6000 for 6 to 25 mm 1/4
to one inch IPS, Class 9000 for 32 and 40 mm 1 1/4 and 1 1/2 inches
IPS. Fittings for pipe 50 to 65 mm 2 to 2 1/2 inches IPS: ASTM A
403/A 403M, ASME B16.9, butt welding, seamless wrought stainless
steel Type [304L] [316L], double extra strong (XXS).
b.
Nickel-copper pipe: ASTM B 165, seamless, annealed, Schedule 160
up to 25 mm one inch IPS, double extra strong (XXS) for 32 to 80 mm
1 1/4 to 3 inches IPS, [,larger sizes shall be special as
indicated.] Wall thickness "schedule" and "weight" designations
shall conform to ASME B36.10M. Fittings 40 mm 1 1/2 inches IPS
and smaller: ASME B16.11, forged nickel-copper ASTM B 564, socket
welding, Class 6000 for 6 to 25 mm 1/4 to one inch IPS, Class 9000
for 32 and 40 mm 1 1/4 and 1 1/2 inches IPS. Fittings for pipe 50
mm 2 inches IPS and larger: ASME B16.9, butt welding, seamless
wrought 70-30 nickel-copper, double extra strong (XXS), 50 to 80 mm
2 to 3 inches IPS.
SECTION 15212N
Page 27
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