Viking Pump TSM640: Lid-Ease Strainers - Manual (Page 2)

SECTION TSM 640 ISSUE F PAGE 2 OF 4
INSTALLATION
Strainers should be placed ahead of any equipment needing
protection. The mesh size used in the strainer body should be
only as small as required to protect the equipment. This will
minimize the pressure drop through the strainer. For pump
protection locate the strainer on suction side of the pump.
Proper sizing of the strainer and basket mesh can prevent
the pump from cavitating due to excessive pressure drop
across the strainer. There are several factors which influence
pressure drop such as viscosity of fluid, percentage and size
of particles or contaminants, and frequency of cleaning.
If the liquid contains undesirable ferrous particles, magnetic
inserts can be added to the baskets to help remove these
particles.
A second strainer (or filter) located on discharge side of pump
may be desirable to protect other equipment in the system
which requires a smaller mesh basket for finer straining of
the liquid. A basket with a smaller mesh opening (the higher
the mesh number, the smaller the opening in the mesh) can
be permitted on the discharge side because pressure drop is
less critical. Maximum differential pressures allowable across
strainers are listed in Table A.
Locate the strainer in a position where the drain plug can
be easily removed (Replace the plug with a drain valve for
frequent maintenance). Provide adequate space above the
strainer for basket removal as listed in table A. The Lid-Ease
strainer has cast arrows on the body to indicate the direction
fluid must flow. These strainers are not designed for any type
of backwash operation.
NOTE: Mounting the strainer with ports in a vertical position
is NOT recommended because of increased difficulty during
servicing.
For the larger strainers, additional external support of the
strainer may be required to reduce pipe strain in the system.
This can be accomplished either by supporting the flanges or
providing a base for the bottom of the strainer. Lid removal for
maintenance will be much easier if the top of the strainer is
not over 3 feet off the ground. In the event that the strainer is
not at highest point in the system, valves are recommended
on both sides of strainer to prevent the strainer from filling up
while cleaning the basket.
As the basket becomes clogged with foreign matter,
differential pressure will rise. Table A shows maximum
pressure differential allowable across the basket. If this
pressure is exceeded, damage to the basket may occur. A
good way to indicate when basket must be cleaned is to: 1)
Strainer Size 1” 1 1/2” 2” 3” 4” 6” 8”
Basket Clearance
(Required from
port centerline)
6.0 6.5 7.5 9.5 11.75 16.5 24.5
Maximum Basket
Differential
Pressure (PSID)
150 150 150 125 125 75 50
Maximum System
Pressure (PSIG)
200 200 200
①
125
①
125
①
125
①
125
① 175 PSI on liquid temperature below 150 °F
NOTE: Before removing the lid to clean the basket make
sure that you have a spare o-ring in the event that the fluid
being strained has caused the o-ring to swell.
1. Remove the thumbscrew from top of lid.
2. Rotate the weatherseal lid counter clockwise until the pin
hits and stops. (The lid features an internal pin, which
locates the on and off positions.)
3. Raise up the lid.
4. Remove the basket and clean. Do not strike the basket
to clean it out; this could deform the basket side or lip
and decrease the strainers effectiveness. Avoid using a
sharp object such as a screwdriver, which could puncture
the mesh. To clean the basket, use a small brush or
compressed air.
ASSEMBLY
1. Place basket into strainer body.
2. Reinstall the lid with the tab of the lid just to the left of the
boss with the threaded hole on the body (See fig. 2).
NOTE: Do not attempt to install the lid if the strainer has
filled up; drain before installing the lid. Press down on
the lid firmly and evenly until it pops into place.
DANGER !
Before opening any Viking product (Strainer,
pumping chamber, reservoir, relief valve
adjusting screw cap etc.) be sure:
1. That any pressure in the strainer or pumping
chamber has been completely vented through
suction or discharge lines or other appropriate
openings or connections.
2. That the driving means (motor, turbine,
engine, etc.) has been “Locked Out” or made
non-operational so that it cannot be started
while maintenance is being preformed.
3. That you know what liquid the strainer has
been handling and the necessary precautions
to safely handle the liquid. Obtain a Material
Safety Data Sheet (MSDS) for the liquid to be
sure these precautions are understood.
Failure to follow above listed precautionary
measures may result in serious injury or
death.
Install a pressure differential gauge or 2) install a pressure
gauge on each side of the strainer.
NOTE: Strainers located on the discharge side of the pump
must have a safety relief valve between the pump and the
strainer set no higher than the strainer’s maximum system
pressure (see Table A).
TABLE A
DISASSEMBLY