47 Figure 2. Two spiders in vertical filter/separator bonded together with braided stainless steel wire, bonded to vessel via separator tie-rods. Figure 3. Spider on pre-filter bonded to baffle with braided stainless steel wire. that are bonded to the vessel. However, the other spider on the screw-base coalescers might not be bonded to anything (it thus becomes an “unbonded charge collector” which could lead to fires in the vessel). Insure that these spiders are bonded electrically to the vessel by attaching to a metal clip, or by a braided stainless steel wire to the separator spider (see Fig. 2). When converting a pre-filter (micronic) vessel from openended cartridges with tie rods to screw-base cartridges, ensure the spider is somehow bonded to the vessel either by support clips on the vessel interior or by the braided stainless steel wire to the baffle plate (see Fig. 3). A prefilter vessel with no internal baffle plate is a problem. The purpose of the baffle plate or angle iron is to divert flow to the top of the vessel so the full flow does not all work against the nearest cartridges. Without the baffle plate, the nearest cartridges to the inlet can be torn apart. This vessel had been converted to screwbase filter cartridges, and had an unbonded spider at the top. There was visual and audio evidence of internal electrical discharge. Spiders, properly bonded, are important components of filter vessels!
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