2.1.13
Pipe Threads
ASME B1.20.1.
2.1.14
Steel Sheet
Carbon, zinc-coated (galvanized) by the hot-dip process:
ASTM A 653/A 653M.
Gauges specified are Manufacturer's Standard Gauge.
2.1.15
Strainer
Unless otherwise specified, strainer shall have screwed ends to 50 mm 2
inches, flanged for 65 mm 2-1/2 inches and larger.
2.1.15.1
Body
For systems up to 1.03 MPa 150 psi, Class 150 150 pound WSP class, cast
steel; and for higher pressure, 2.06 MPa 300 psi,Class 300 300 pound WSP
class forged steel or cast steel shall be used.
2.1.15.2
Screen
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NOTE: Specify screen size for the needs of the
equipment.
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Screen shall be Type 304 stainless steel, with free area not less than 2.5
times inlet area. For water system, perforation shall be 6.4 mm 1/8 inch
for strainer size up to 200 mm 8 inches, and 4 mm 5/32 inch for strainer
250 mm 10 inches and larger. For steam and condensate system, the
perforation shall be 0.4 mm 1/64 inch for strainer size up to50 mm 2 inches,
0.8 mm 1/32 inch for strainer 65 mm 2-1/2 inches through 100 mm 4 inches,
and 1.2 mm 3/64 inch for strainers 125 mm 5 inches and larger. Screen
shall be reinforced wire gauge, with continuous magnetic field around
entire circumference of screen and magnets with stainless steel retaining
lugs and threaded rods.
2.1.15.3
Y-Type Strainer
Y-type strainer shall be provided as shown. Y-type strainer shall be full
line size of connecting piping, with ends matching piping system materials.
Y-type strainers shall be provided with a globe valve blowdown.
2.1.15.4
Tee Strainer
Tee strainer shall be provided as shown. Tee strainer shall be the full
line size of the connecting piping with ends matching the piping system
materials. Tee strainer shall have a swing bolt closure.
2.1.15.5
Basket Strainer, including Duplex Basket Strainer
Basket strainer shall be provided as shown. Basket strainer shall have
bolted covers to allow removal of the basket for cleaning. Duplex basket
strainer shall include a multiport plug valve to allow the operator to
switch active strainer baskets without interrupting system operation.
SECTION 15561A
Page 22
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