Mueller Steam Specialty Duplex Strainers Installation Manual

Installation, O p e r a t i o n an d Ma i n t e n a n c e

Duplex Strainers 3/4"-6"

Receiving, Handling and Inspection

1. Unpack and inspect strainer for damage that may have occurred
during shipping. Any damage should be reported to the car­rier immediately. Store the container in a dry, clean area until the
strainer is installed.

2. Remove strainer covers and inspect for any foreign matter that
could be washed downstream when the strainer is put into service.
The strainer has been packed with a preservative coating on the
inside surfaces. This should be removed if there is a possibility of
contamination of the piping system. See Disassembly Instructions
for Service and Maintenance in this manual.

3. Carefully check the pressure and temperature ratings on the
strainer body or nameplate to be sure that they are correct for the
intended application.

IOM-MS-Duplex-S

Installation Instructions

1. Place the strainer in the line so that the liquid enters the side
marked INLET. DO NOT LIFT the strainer by the knobs or gear
operator. Use slings around body or flanges for lifting. On sizes 3”
or smaller, be sure there are pipe supports close to the inlet and
outlet sides of the strainer. Sizes 4” and larger must be supported
on a concrete or steel pad.

2. Allow enough room above the strainer for easy basket removal. See
TABLE A.

3. When connecting flanged strainers to the line, be sure that the
flanges are the same: flat face to flat face or raised face to raised
face. Flat face flanges require full-face gaskets. The specified
face-to-face dimension of the strainer is an approximate one due to
machining tolerances. Allow adjustment in prefabricated piping or
request certified dimensions.

4. Check to see that flange gaskets are properly positioned before
tightening bolts. Tighten bolts in sequence.

5. We recommend the installation of flexible hoses on the pet cocks
on the basket covers if service temperatures greater than 120°F are
expected.

Start Up Instructions

1. Turn handle to the center, directly over the INLET. Open pet cocks
on both basket covers. SLOWLY fill the chambers with line fluid.
Close pet cocks when fluid starts to flow from them.

2. Allow system to gradually reach normal operating pressure and
temperature. Check carefully for leaks at this time. Be sure that all
basket cover knobs and bolts are securely tightened. If there are
any leaks, follow the procedures in this manual under Disassembly
Instructions For Service and Maintenance.

3. Rotate handle until it is directly over one of the chambers. The
handle is always over the chamber in service. (On units with gear
operators, turn to position 1 or 2) DO NOT leave the handle in the
center position or both baskets will become clogged, requiring the
system to be shut down for cleaning. See Changeover and Cleaning
Instructions in this manual for switching the flow from one to the
other.

Table A

in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm

Strainer Size 3/4 20 1 25 11/4 32 11/2 40 2 50 21/2 65 3 80 4 100 5 125 6 150
Basket Allowance Removal 67/16 164 67/16 164 73/16 183 73/16 183 121/2 318 1711/16 449 1711/16 449 233/8 594 251/4 641 251/4 641

               

Changeover And Cleaning
Instructions

Disassembly Instructions for
Service and Maintenance

WARNING:

BEFORE ANY KIND OF SERVICING, BE SURE TO CHECK PRESSURE
AND TEMPERATURE OF THE SYSTEM AND WHETHER THE FLUID
IS CORROSIVE OR OTHERWISE DANGEROUS. Bodily injury and
property damage could result if appropriate protection and safety
procedures are not used. Read the following instructions completely
and carefully BEFORE SERVICING.

Keep these instructions for future reference.
In the instructions below, it is important to keep in mind that the “dirty”
chamber is the one in use NOW. The handle is always directly over the
one in use. The “clean” chamber is the one that is not in use. See Figure 1.
For units with gear operator, see Figure 2.

1. Open pet cock on clean chamber.

2. Admit liquid slowly into the clean chamber by turning the diverter
handle to the hallway position over the inlet or turn gear operator
to position “1 and 2”.

3. When liquid flows from the pet cock, close the pet cock.

4. Examine clean chamber for leaks. If none, proceed with step 6.

5. If leakage occurs, turn diverter handle back to its position over
the dirty chamber. Vent and drain the clean chamber, remove the
cover, correct the cause of leakage, replace cover and repeat steps
1 through 4.

6. Slowly shift flow to the clean chamber by slowly rotating the divert­er handle over the clean chamber. If there is no leakage, proceed
to step 7. If there is leakage, repeat step 5.

7. Open pet cock slowly on the dirty chamber.

8. Open drain plug on dirty chamber and allow liquid to drain while
removing the cover.

9. When liquid level is below the top of the strainer basket, close the
drain plug.

10. Remove the strainer basket and allow the liquid to drip into the
strainer body.

11. Clean the basket and examine for damage. Repair or replace as
necessary.

12. Reinstall basket

13. Examine cover o-ring. Replace if damaged.

14. Reinstall and secure cover.

15. Shift diverter handle back toward the center position.

16. When liquid flows from pet cock, close pet cock.

17. Examine for leaks. If leakage is evident, go to step 5. If there is no
evidence of leakage, shift diverter handle back to its position over
the clean basket. The newly cleaned basket is now ready for the
next changeover when needed.

WARNING:

BEFORE ANY KIND OF SERVICING, BE SURE TO CHECK PRESSURE
AND TEMPERATURE OF THE SYSTEM AND WHETHER THE FLUID
IS CORROSIVE OR OTHERWISE DANGEROUS. Bodily injury and
property damage could result if appropriate protection and safety
procedures are not used. Read the following instructions completely
and carefully BEFORE SERVICING.

Keep these instructions for future reference.
This strainer can remain in the line while being serviced. If desired,
it may also be removed from the line servicing. Care should be taken
when removing the basket housing 3” and larger units. Slings should be
used to remove the basket housings on these larger units. DO NOT LIFT
the strainer or the basket housing by the knobs or gear operator.

1. Shut down flow on both sides of the strainer.

2. Turn diverter handle toward the center position or turn gear opera­tor to position “1 AND 2”. Open pet cocks on both chambers to
bleed pressure.

3. Open drain plugs and drain both chambers.

4. Remove the knobs from the basket covers and remove the covers.
Pull the strainer baskets from the basket housings.

5. Turn diverter handle toward the main basket housing (Basket #1).

6. Loosen nuts holding the basket housing to the main housing and
carefully pull basket housing from the main housing. (Use a sling, if
needed, to insure that the basket housing does not drop.)

7. Slide both balls from the main housing by pulling them directly out
from the housing.

8. Remove the PTFE seals from both the main housing and the basket
housing.

9. If only the seats are to be replaced, skip to Step 16.

10. Remove the lower stem from the main housing by pressing it down
from the top into the lower ball area.

11. Remove handle or gear operator from the main housing.

12. Remove the upper stem from the main housing by pressing it down
from the top into the upper ball area.

Figure 1

Figure 2

Table B

in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm

Strainer Size 3/4 20 1 25 11/4 32 11/2 40 2 50 21/2 65 3 80 4 100 5 125 6 150
NPT Plug Drain Plug Size 1/2 15 1/2 15 11/4 32 11/4 32 11/4 32 11/2 40 11/2 40 11/2 40 11/2 40 11/2 40
NPT Pet Cock Size

1

/8 3 1/8 3 1/8 3 1/8 3 1/8 3 1/8 3 1/8 3 1/8 3 1/8 3 1/8 3

Knobs

Pet Cock

Basket Housing
Cover

Pet Cock

Main
Housing

Gasket

Stop Pins

Support
Screws

Body
Studs

Seats

Main
Housing
O-rings

Diverter Handle

Balls

Lower
Stem
O-ring

Basket
Housing Cover

Upper Stem
O-rings

Thrust Washer

Upper Shaft

Seats

Cover
O-ring

Basket

Lower Stem

Basket
O-ring

Basket
Housing
Studs

Basket
Housing

Assembly Instructions

13. Inspect all o-rings on the upper and lower stems and, if worn,
replace them.

14. Slide thrust washer on the upper stem. Lightly grease the o-rings on
the upper stem. Insert the upper stem into the main housing from
the upper ball area by pushing up through the top hole. Insure that
the rounded portion of the stem faces toward the basket in the main
housing.

15. Lightly grease the o-ring on the lower stem. Insert the lower stem
into the main housing from the lower ball area by pushing up
through the center hole. Insure that the flats on both the upper and
lower stems are in line and parallel with each other.

16. Inspect the counterbores for the PTFE seats in the main housing to
insure that they are clean. Push the PTFE seats into the counterbore
making sure that they are flat and parallel to the counterbore.

17. Slide the ball into the upper chamber keeping the solid side of the
ball facing the basket in the main housing.

18. Slide the ball into the lower chamber keeping the solid side of the
ball facing the basket in the main housing.

Drain
Plug

19. Inspect the main housing o-rings in the counterbore of the ball
chambers and replace if worn.

20. Inspect the counterbores for the PTFE seats in the basket housing
to insure that they are clean. Push the PTFE seats into the counter­bore making sure that they are flat and parallel to the counterbore.

21. Verify that the balls are installed correctly and slide the basket
housing on to studs in the main housing. Install lock washers and
nuts and tighten the nuts in the proper sequence.

22. Reinstall handle or gear operator on the main housing.

23. Inspect the o-rings on the baskets and replace if worn. Insert the
baskets in the counterbore in the basket chambers.

24. Inspect the o-ring in the covers and replace if worn. Assemble the
covers on the basket housings and tighten down with the knobs.

25. Reinstall the drain plugs in both basket housings.

26. The unit is now ready for service. Follow the procedures under Start
Up Instructions in this manual to place the unit in service.

For additional information, visit our web site at: www.muellersteam.com

Limited Warranty: Mueller Steam Specialty warrants each product to be free from defects in material and workmanship under normal usage for a period of one year from the date of original shipment.
In the event of such defects within the warranty period, the Company will, at its option, replace or recondition the product without charge. This shall constitute the sole and exclusive remedy for breach of
warranty, and the Company shall not be responsible for any incidental, special or consequential damages, including without limitation, lost profits or the cost of repairing or replacing other property which is
damaged if this product does not work properly, other costs resulting from labor charges, delays, vandalism, negligence, fouling caused by foreign material, damage from adverse water conditions, chemical,
or any other circumstances over which the Company has no control. This warranty shall be invalidated by any abuse, misuse, misapplication or improper installation of the product. THIS WARRANTY IS IN
LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Any implied warranties that are
imposed by law are limited in duration to one year.

Some States do not allow limitations on how long an implied warranty lasts, and some States do not allow the exclusion or limitation of incidental or consequential damages. Therefore the above limitations
may not apply to you. This Limited Warranty gives you specific legal rights, and you may have other rights that vary from State to State. You should consult applicable state laws to determine your rights.

A Watts Water Technologi es Company USA: 1491 NC Hwy 20 West, St. Pauls, NC 28384; www.muellersteam.com

Tel: [phone] Fax: [phone]
Toll Free Phone [phone] Toll Free Fax: [phone]

IOM-MS-Duplex-S 1020 EDP#1915974 © 2010 Mueller Steam Specialty