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Shoptalk
Simple Facts about Liquid Filtration

Hydraulic Oil Test Kits Oil Sampling Watch Out for Dents on SHOPTALK
Accessories Liquid Filters!
Our basic hydraulic oil kit
reports TAN (total acid number), These accessories Dents May Cause Cracks
water in PPM and ISO particle can simplify your oil Cracked filters can be caused by dents made
count. during improper installation. Filters that are dented
analysis during normal prior to or during installation should not be used.
Hydraulic Oil Test Kits maintenance routines. Filters dented after installation should be replaced
immediately. The cost of replacing a dented filter is
1- Basic Use Kit X007374 much less than the cost of the damages that could
2- Correct Drain and ISO use Kit X007377 result from a dented filter that fails during service.
1 2
Metals, ppm by wt  
Viscosity, cSt.  
Water % 
TAN (Total Acid #) 
Water, ppm 
ISO Particle Count 

Sampling Pump (P176431) &
Plastic Tubing (P176433) sold
separately in 100 ft. rolls)

Dents in a steel filter canister create a concentration of
stress, making the canister more susceptible to fatigue.

Filter fatigue results from pressure pulses within
the system. Pressure is regulated by a pressure
regulating valve. This valve is spring operated and
intermittently opens and closes to regulate pressure.
Kit X007377 for basic hydraulic oil analysis Once pressure exceeds the setting of the spring in
the regulating valve, the valve will open and relieve
Recommended Sampling Interval pressure until the spring can expand and close the
valve. This function is repeated continuously during
Industrial / Stationary operation of the system, creating a pulsing effect.
Filter canisters are subjected to the same pulsation.
Diesel Engines 500 hours / monthly However, unlike the spring in the pressure regulating
Nat Gas Engines 500 hours / monthly valve, canister material is susceptible to failure after
Gas Turbines 250 hours / monthly Quick Sampling Metal Valve such fatigue.
Compressors 250 hours / monthly for test point. 1/8" NPT
Steam Turbines 250 hours / monthly (P563212) Filters are designed with a low carbon steel to resist
fatigue and are formed so the stress created by the
Working Pressure
Geared Drives 500 hours / monthly 5800 psi / 400 bar pulses in the system are equalized over the surface
Bearings 500 hours / monthly area of the canister. A dent provides an area of
Hydraulics 500 hours /monthly stress concentration where pressure pulses can
greatly shorten the fatigue life of the canister.
Marine Engines If you receive filters that were dented prior to your
Main 250 hours / monthly receipt, you should contact Donaldson customer
Support 150 hours / oil change support for corrective action.
Non-Engines 500 hours / monthly

More information is available through the
Filter Manufacturers Council at:
http://www.filtercouncil.org/techdata/tsbs/97-8R1.html

Ref: Shoptalk Card F115275

www.donaldson.com Engine Liquid Filtration • 17