A-A-59000A
3.4.1 Screen strength test. The strainer screen shall be tested by applying
a differential pressure across the screen equal to 100 percent of the
specified strainer design pressure for the applicable type and class, using
water for a duration of 10 minutes. Differential pressure shall be applied in
a rapid manner, one minute or less. Screen which distort, stretch, or exhibit
other weaknesses shall be rejected.
3.5 Actuation. Each strainer screen shall be fitted with a shaft along its
rotational axis, which penetrates the compartment cover through a watertight
seal. Outside the housing, the shaft shall be capable of being fitted with
either a manual hand wheel (Type I) or an electric motor actuator (Type II).
Each manually actuated handwheel shall be sized and configured so that maximum
required operating force is less than 50 pounds (lbs). For certain hazard
areas, such as installation in a JP-5 pump room, the motor actuator (Type II)
shall be explosion proof.
The scraper blades in all strainers size 4 inches and
3.6 Scraper bars.
above shall be capable of inspection and adjustment via a removable watertight
inspection cover on the strainer body, without having to further disassemble
the strainer. Each scraper bar shall be aligned so that the screen can be
turned in either direction without being damaged.
TABLE II.
Materials required for strainers.
Applicable
Part
Material
Documents
Remarks
Bodies, covers
Copper-nickel
ASTM B 369
C96400
(parts in contact
alloy
with sea water)
Aluminum bronze
ASTM B 148
C95800
Collar, handwheel
Cast tin bronze
ASTM B 61
C92200
operators, (parts
Aluminum bronze
ASTM B 505
C95800
not in contact with
sea water)
CRES
ASTM A 276
C31600
Scraper
NiCu
ASTM B 127
N04400, N04405
Threaded fasteners
NiCu alloy
ASTM F 467
N04400, N04405
ASTM F 468
"O" rings
Fluorocarbon
MIL-R-83248/1
For all except
threaded bosses
MIL-R-83248/2
Threaded bosses
Screen
CuNi plate
ASTM B 122
C71500
NiCu plate
ASTM B 127
N04400, N04405
3.7 Functional performance. Unless otherwise specified (see 7.1), design
flow capacity and design temperature shall be as specified in table III.
3
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