Armstrong D Series 2500 lb socketweld forged steel Y-type strainers feature a leak-proof, crush-proof screen chamber. Both ends of the screen chamber are precision machined, ensuring a perfectly round and smooth seating surface as well as a fixed chamber length. Because the screen sits snugly against the machined surfaces, particles larger than the screen openings cannot bypass the ends of the screen.

The bolted screen retainer design ensures easy installation and removal. Straight threads mean that less torque is required to achieve a tight seal with proper gasket engagement, and less torque is needed to remove the retainer. This design significantly reduces the risk of "freezing" compared to hard-to-break tapered pipe threads.

Materials

Connection Size	Body	Screen Retainer	Gasket	Bolting	Standard Screen
1/2", 3/4", 1", 1-1/4", 1-1/2", 2" (15 - 50 mm)	ASTM A182 Gr. F22	ASTM A182 Gr. F22	347 SS Spiral Wound Non-asbestos	Studs ASTM A193 Gr. B16 Nuts ASTM A194 Gr. 2H	304 SS .045" perforated

Note: Other screen materials and meshes are available upon request.

Dimensions and Weights

Size	Ordering Code	Weight	A	B	C*	Max Pressure (Saturated Steam)	Max Pressure (100°F / 38°C non-shock)	Retainer Type	Connections
1/2" (15 mm) 3/4" (20 mm) 1" (25 mm)	D1SW	26 lb (12 kg)	5-1/8" (130 mm)	5-5/8" (143 mm)	1/2" (15 mm)	2500 psig (172 barg)	6000 psig (414 barg)	Bolted	ANSI B16.11 Socketweld
1-1/4" (32 mm) 1-1/2" (40 mm) 2" (50 mm)	D1SW	56 lb (25 kg)	6-5/8" (168 mm)	7-3/8" (187 mm)	1/2" (15 mm)	2500 psig (172 barg)	6000 psig (414 barg)	Bolted	ANSI B16.11 Socketweld

* Socketweld blowdown connections for 1/2" (15 mm) pipe.

Installation

To ensure against untimely shutdown of equipment, strainers should be installed ahead of pumps, loading valves, control valves, meters, steam traps, turbines, compressors, solenoid valves, nozzles, pressure regulators, burners, unit heaters, and other sensitive equipment.

Clean all threaded areas of pipe thoroughly before installing the strainer. The strainer can be installed in the horizontal or vertical down position.

CAUTION: WELDING D-SERIES STRAINERS

When installing socket weld strainers, be aware that the D-Series strainer has a non-metal gasket that can be damaged by excessive heat. Try to minimize welding time, and cool the strainer after welding. If pre- and post-weld heating is needed (as is typical for the D-Series F22 material), removing the gasket prior to welding is highly advisable.

Operation and Maintenance

After the initial operation of the system, the strainer should be blown down to remove any installation debris caught in the screen. Repeat the blowdown procedure on a regular schedule thereafter. Frequency of blowdown depends on the operating conditions to which the strainer is subjected.

If no blowdown valve is installed, the strainer can be cleaned by removing the screen retainer and screen.

ISOLATE BEFORE MAINTENANCE

Equipment under pressure - Operating temperature > 100°C. Always isolate the strainer from the pressurized system and ensure it is cold before opening to clean or handle.

Internals Maintenance Steps:

1. If a blow-down valve is installed, open it to clean the screen.
2. If no blow-down valve is installed, make sure the strainer is isolated and cold beforehand.
3. Unscrew the retainer from the strainer's body and clean or replace the screen.
4. Replace the gasket (always use a new gasket when reassembling).
5. Screw the retainer back onto the body.

The strainer screen should be inspected one to two times per year. Recommended spare parts are one screen and three gaskets per strainer.

Replacement Parts

When ordering replacement strainer gaskets or retainers, state the type of connection, connection size, and body material of the strainer.

Standard Replacement Gaskets for Forged Steel Strainers (D Series):

Strainer Size	Forged Steel "D" Part No.
1/2", 3/4", 1"	A6254
1-1/4", 1-1/2", 2"	A6259