Viking Pump TSM640: Lid-Ease Strainers - Manual (Page 3)

SECTION TSM 640 ISSUE F PAGE 3 OF 4
NOTE: When installing a new o-ring, it is recommended that
the o-ring be lubricated with grease before installing onto
the lid.
DANGER !
Before starting the system, be sure the lid
is turned to the proper position and the
thumbscrew is installed to prevent the lid
from turning
FIGURE 2
O-RING INFORMATION
Proper application and use of the o-ring elastomer will affect
the ease of lid removal and the life of the o-ring. Compatibility
of the elastomer with the fluid(s) at operating temperature
extremes, is essential and Table B lists suitability for several
o-ring elastomers, along with Viking’s means of identification.
If an o-ring is incompatible with a fluid, excessive o-ring swell
or contraction might result and/or properties of the elastomer
may change, reducing the satisfactory performance life of
the o-ring. Included in Table B is a general list of fluids that
Parker’s O-Ring Manual does and does not recommend
for specific elastomers. Obviously if an o-ring should swell,
sealing will be enhanced between lid and body, but would
make the lid difficult to remove. Conversely, o-ring shrinkage
will reduce sealing and possibly cause a leak. Several good
sources are available covering o-ring compatibility. These
include o-ring manufacturers literature, Viking Pump’s Liquid
List, Viking’s Application Department, manufacturers of other
components in the system and previous experience.
Generally it is best to have an extra o-ring on hand when
removing the lid. Once the lid has been removed, if any
swelling has occurred, reinstalling the lid with the existing
o-ring will be difficult (if not impossible) and may require
another o-ring. Once o-ring dries out, it can sometimes be
used again.
PTFE (Derivative) Encapsulated o-rings generally do not
swell. Do not attempt to reuse this type of o-ring if it has been
removed. Immerse a new o-ring in boiling water for a few
minutes. Remove from the water and stretch out the o-ring so
it will fit onto the casing hub of the lid without forcing it over
a sharp edge. Run hot water over the o-ring until it shrinks
down tight into the groove of lid.
3. Rotate the lid clockwise until the two holes line up.
4. Reinsert the thumbscrew.
5. Reinstall the drain plug (if removed) or close the drain
valve (if installed).
6. Before starting up the system, make sure to open all
valves that were closed for servicing. After starting up
the system, check for any possible leaks. If there is any
leakage around the lid, return to Disassembly. Remove
the lid and refer to Trouble-Shooting, page 4, for possible
causes of leakage.
TYPE OF ELASTOMER
VIkING
IDENTIFICATION
TEMPERATURE LIMIT ①
LIMIT °F
LIqUIDS ②
RECOMMENDED NOT RECOMMENDED
BUNA NO DOT -20 TO +225 Petroleum, oils and fluids
Silicone greases & oils
Ethylene glycol base
General purpose sealing
Halogenated hydrocarbon
Nitro hydrocarbon
Phosphate ester
Ketones
Ozone
Automotive break fluid
VITON GREEN DOT -15 TO +400 Petroleum oils
Di-Ester base lubricant
Silicone fluids & grease
Halogenated hydrocarbon
Selected phosphate ester acids
Ketones
Skydrol
Amines
Low molecular weight esters & ethers
Hot hydrofluoric or chlorosulfonic acids
ETHYLENE PROPYLENE
RUBBER
ORANGE DOT -65 TO +300 Water
Dilute Acids
Dilute alkalies
Ketones
Alcohol
Petroleum Oil
Di-Ester base lubricant
SANITARY YELLOW DOT -20 TO +225 Same as Buna-N
PTFE (DERIVATIVE)
ENCAPSULATED
NO DOT ORANGE
CORE
(STANDARD)
-40 TO +300
Most solvents & chemicals
Consult factory if unsure about
compatibility
Molten alkali metals
Fluorine and strong
fluorinating agents
NO DOT
PURPLE CORE
(HIGH TEMP)
-40 TO +400
① Temperatures listed are for static seal applications only for the Lid-Ease Simplex strainer line.
② Source: Parker O-Ring Handbook (except for PTFE (Derivative) Encapsulated).
TABLE B
O-RING SELECTION
ASSEMBLY (Cont.)