Non Spark Discharge Filter Element Upgrades0 pages

HY-PRO FILTRATION
NSD - Non-Sparking Elements
Non-Sparking Elements
Hy-Pro G8 element and media technology
optimized to prevent spark discharge and
minimize potential energy in bearing
lubrication and hydraulic control systems.
Prevent oil degradation caused by
thermal events associated with element
spark discharge.
Prevent anti-oxidant additive depletion
and extend useful fluid life.
Hy-Pro NSD elements eliminate sparking
without sacrificing fluid cleanliness.
Filter Element Spark Discharge
As fluid passes through the typical tortuous filter media fiber matrix
turbulence increases resulting in thermal events as the fluid layers shear
creating static accumulation on elements that can lead to high voltage
spark discharge from media to support tube. Photos 1 and 2 show
evidence of sparking on the filter element support tube (pitting and
burning), and photo 3 shows filter media and support mesh from a lube
filter element with spark discharge burn damage.
The change from Group I to Group II has enhanced the effect of spark
discharge. Group I base stock oils could conduct low levels of static
charge out of the system to ground. The changes in resistivity with Group
II base stocks mean that static charges stay in the system and can yield
higher levels of static charge on filter elements. If the element cannot
minimize and dissipate the charge, static on the element will build until it
eventually arcs to a nearby surface.
Hy-Pro NSD Elements, Cleaner Fluid Without Sparking
For some the answer to preventing element sparking and high potential
energy is to use coarse strainer type filters (Stat-Free) in the main bearing
lube filter duplex. Although this may prevent sparking it renders the main
bearing lube filter assembly useless in preventing catastrophic bearing
failure due to contamination. Independent lab analysis proves that even
Hy-Pro high efficiency 3 micron absolute (b5[c] > 1000) NSD elements are
resistant to spark discharge.
The degree to which element spark discharge contributes to overall
varnish problems is variable. Varnish can result from any combination of
oxidation, anti-oxidant additive depletion, increased fluid stress from high
turbine output, micro-dieseling, new oil formulations and spark discharge.
With Hy-Pro NSD elements, any reduction in thermal sparking events and
tribo-electric effect will have a positive impact by decelerating anti-oxidant
additive depletion and extending useful fluid life. Field test data has
shown that Hy-Pro NSD elements may even reduce or stabilize varnish
potential values by preventing further degradation from sparking and
collecting some insoluble oxidation by-products.
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