Watts Mueller 791 Installation, Operation And Maintenance Manual

Installation, Operation and
Maintenance Manual
Duplex Strainers ¾"-6"
! WARNING
Read this Manual BEFORE using this equipment.
Failure to read and follow all safety and use information
can result in death, serious personal injury, property
damage, or damage to the equipment.
Keep this Manual for future reference.
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 mat-
ter 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 pip-
ing 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.
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 lift-
ing. 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 adjust-
ment 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.
Mueller Steam Specialty product specifications in U.S. customary units and metric are approximate and are provided
for reference only. For precise measurements, please contact Mueller Steam Specialty Technical Service. Mueller
Steam Specialty reserves the right to change or modify product design, construction, specifications, or materials
without prior notice and without incurring any obligation to make such changes and modifications on Mueller Steam
Specialty products previously or subsequently sold.
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.
WARNING
!
Do not use with water that is microbiologically unsafe or of
unknown quality without adequate disinfection before or after the
system.
IOM-MS-Duplex-S