CFS Series Critical Fuel Skid
Kaydon Filtration CFS Series Critical Fuel Skid — Mission-critical diesel fuel polishing for data centers, hospitals, and standby generator installations. Draws fuel from bulk storage for continuous or as-needed polishing. Modbus or Ethernet communication for real-time monitoring..
Inspector Detail
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Common issues
- Filter elements clogging faster than expected, indicating upstream tank sediment or water ingress rather than a filter fault
- Water sensor/probe fouling causing false or missed high-water alarms
- Pump mechanical seal weeping or leaking after extended running
- Suction strainer at the source tank blocking and starving the skid
- Modbus/Ethernet communication dropouts to the building or engine room monitoring system
- Coalescer media saturation reducing water removal efficiency over time
- External corrosion of the skid frame and piping in a humid or poorly ventilated space
- Differential pressure gauges reading incorrectly due to trapped air or a faulty transmitter
Inspection checklist
- Read and log differential pressure across primary and secondary filters
- Check for fuel weeping or leaks at pump seals, unions, and filter housings
- Verify automatic water drain operates and actually removes water from the sump
- Test Modbus/Ethernet communication and confirm alarms reach the monitoring point
- Listen for unusual pump noise or vibration indicating bearing or seal wear
- Confirm all local and remote alarms (high DP, high water, low flow) function correctly
- Inspect the skid frame, piping, and fittings for corrosion or mechanical damage
- Confirm filter housing seals and bowls are seated and leak-free after any element change
Service intervals
| Primary and secondary filter element replacement | when differential pressure reaches the manufacturer's stated change-out threshold, not on a fixed calendar - check the gauge, not the calendar |
| Water separator sump drain check | each operating cycle or per the automatic drain's own schedule |
| Pump seal inspection | annually, or sooner if weeping is observed |
| Full function and alarm test | annually |
Typical wear limits
| Filter change-out differential pressure | trigger point is set by the manufacturer for this skid, typically a rise of roughly 0.5-1.0 bar above the clean-element baseline - confirm against the unit's own control panel setpoint before relying on this figure |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Critical spares
- Primary fuel filter elements
- Secondary/coalescer filter elements
- Pump mechanical seal kit
- Water sensor/probe
- Filter housing O-rings/gaskets
Safety
- Pressurised fuel system - relieve pressure before opening filter housings
- Static discharge risk during filter element changes on flammable fuel
- Fuel spill and fire hazard if housings are not correctly reseated
- Confined or poorly ventilated space if the skid is installed in a small plant room
Class survey
Where this skid supports an emergency or standby power source rather than main propulsion fuel, class treats it as part of the emergency generator fuel supply and will want to see functional test records and filter change-out logs at the relevant survey, not just the generator itself.
Components & Design
Component data being added…
Technical Data
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Common failures & inspection points
Check differential pressure across filter element(s) and compare against manufacturer-specified alarm/change-out threshold (typically 15-25 psid); replace elements when threshold is reached.
Inspect and test automatic switchover / changeover mechanism (duplex valve or handle) for smooth, leak-free operation under operating pressure; verify the standby side pressurizes correctly before cutover.
Drain and inspect automatic water drain valve (where fitted) and water collection bowl; verify no fuel carryover and that drain opens/closes fully.
Examine filter housing seals, O-rings, and cover/bowl threads for deterioration, swelling, or leakage; replace per manufacturer interval or at every element change.
Verify bypass valve integrity and set-point (e.g. 50 psid for Model 980/981 series): test opening pressure and confirm it closes fully to prevent unfiltered bypass flow.
Sample filtered fuel downstream and test for water content (ppm) and ISO cleanliness code to confirm filter is performing to specification (e.g. <100-130 ppm water, ISO 4406 target code).
Inspect and clean inlet Y-strainer / pre-filter basket (where fitted) to prevent coalescer element blinding; check mesh for tears or deformation.
Check all instrumentation (differential pressure gauges, sight glasses, pressure gauges, TELEFLO flow switches) for correct indication and calibration; replace faulty instruments promptly.
Type-general inspection and maintenance points for this equipment category — not model-specific.
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