The Armstrong A Series Class 250 Cast Iron Y-Type Strainer is designed to mechanically remove solids from a flowing fluid or gas in a pipeline by utilizing a perforated or mesh straining element. To ensure against untimely shutdown of equipment, these 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.

The A Series features a leak-proof, crush-proof screen chamber. The chamber ends are precision machined, meaning the seating surfaces are perfectly round and smooth, and the chamber length is fixed. Because the screen fits snugly against machined surfaces, particles larger than the screen openings cannot bypass the ends. The straight thread screen retainer allows for tight sealing with less torque through proper gasket compression, reducing the risk of "freezing" compared to hard-to-remove tapered pipe threads.

Installation

Clean all threaded areas of the pipe thoroughly before installing the strainer. Use pipe dope or teflon tape sparingly. Leave the end thread exposed to avoid introducing the sealant into the piping system. The strainer can be installed in the horizontal or vertical down position.

CAUTION

When installing socket weld strainers 1-1/4" size and larger, and all D-Series strainers, be aware the 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, removing the gasket may be 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 to be used, the strainer can be cleaned by removing the screen retainer and screen.

WARNING

Always isolate the strainer from the pressurized system before opening to clean. Equipment may be under pressure and operating temperatures can exceed 100°C (212°F). Make sure the strainer is cold before handling! Use a new gasket when reassembling the strainer.

Internals Maintenance

1. If a blow-down valve is installed, open it to clean the screen.
2. If no blow-down valve is installed, make sure that the strainer is isolated and cold before handling.
3. Unscrew the retainer from the strainer's body and clean or replace the screen.
4. Replace the gasket.
5. Screw the retainer back onto the body.

TIP

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

Pressure and Temperature Ratings

Materials and Physical Data (250 lb Screwed)

Materials: 250 lb Screwed 1/2" - 3" (15 - 80 mm)

Connections Size (in)	Body	Standard Screen	Screen Retainer	Gasket	Bolting
1/2, 3/4	ASTM A48 Class 30 Cast Iron	304 SS .045" perforated	ASTM A48 Class 30 Cast Iron	Spiral Wound	N/A
1, 1-1/2, 2	ASTM A48 Class 30 Cast Iron	304 SS .045" perforated	ASTM A48 Class 30 Cast Iron	Spiral Wound	N/A
1-1/4	ASTM A48 Class 30 Cast Iron	304 SS .045" perforated	Soft Steel	Spiral Wound	N/A
2-1/2, 3	ASTM A48 Class 30 Cast Iron	304 SS .045" perforated	ASTM A48 Class 30 Cast Iron	Non-asbestos	Cap Screws ASTM A193 Gr. B7

NOTE: Other screen materials available.

Physical Data: 250 lb Screwed 1/2" - 3" (15 - 80 mm)

Size (in)	Ordering Code	Weight (lb)	A (in)	B (in)	C (in)	Max Steam (psig)	Max Water 150°F (psig)	Retainer Type
1/2	CA1SC	3	4-1/4	3	3/8	250	400	Threaded
3/4	CA1SC	3	4-1/4	3	1/2	250	400	Threaded
1	CA1SC	4-1/2	5	3-3/4	1/2	250	400	Threaded
1-1/4	CA1SC	7	5-1/2	3-7/8	1/2	250	400	Threaded
1-1/2	CA1SC	10	6-5/16	4-7/16	1/2	250	400	Threaded
2	CA1SC	15	7-1/2	5-7/16	1/2	250	400	Threaded
2-1/2	A1SC	24-1/2	8-1/2	6-7/16	3/4	250	400	Bolted
3	A1SC	45-1/2	10-1/2	8	1-1/4	250	400	Bolted

Replacement Parts

To order replacement strainer screens, state connection size of strainer, screen material and type of perforation or mesh. When ordering replacement screens for flanged strainers, state flange rating.

Standard Replacement Gaskets for Cast Iron Strainers

Strainer Size (in)	Cast Iron "A" Part No.
3/8"	A4469
1/2"	A4469
3/4"	A4470
1"	A4471
1-1/4"	A6256
1-1/2"	A6267B
2"	A6263
2-1/2"	A21274-1
3"	A21340-1
4"	A22106-1
5"	A21343-1
6"	A22049-1
8"	A21427-1
10"	A21432-1

Strainer Repairs For CA Cast Iron Strainers Only

Strainer Size (in)	Blowdown Plug Part No.	Blowdown Plug Size (in)	Retainer Gasket Part No.
1/2"	A6002A	3/8"	A19251
3/4"	A6003A	1/2"	A19251
1"	A6003A	1/2"	A19252
1-1/4"	A6003A	1/2"	A6256
1-1/2"	A6003A	1/2"	A19253
2"	A6003A	1/2"	A19254