Marley® HP7000 Fan
Performance
Marley HP7000: Performs 3% better in CFM than others to increase cooling tower capacity or Requires 9% less power to deliver equivalent CFM, which can result in $12,000 less in annual energy costs*
Premium Material
Marley® HP7000 Fan minimum material grades are suitable for most cooling tower applications. Others require optional upgrades just to meet our minimum material grades (i.e. aluminum blade clamps to iron, and galvanized hardware to stainless).
Lower Maintenance Costs
Paint, leading edge overlays, and patching are not required due to: Incorporated pigmented resin for superior UV protection Molded in 1/8″ thick nylon barrier strip along the leading edge
More Durable / Longer Life
HP7000 blades are 30-50% stronger than others in buckling strength and the shank diameter is 36% larger than others. This can be crucial in high wind load areas or in common plenum applications. Turbulent air in the fan cylinder could deform other blade designs. Stronger blades help prevent a complete mechanical failure.
Value Added Options
Triple-epoxy coated hub assemblies to premium stainless hub plates or hardware.
* Based on 200 hp vs. 182 hp or 13.42 kW difference x $0.10 per kW/hr x 8,760 annual operating hours = $11,758.20 in energy savings.
Head-to-Head Comparison
| Marley HP7000 | Hudson Tuf-Lite | |
|---|---|---|
| 3% more cooling capacity or 9% less power needed | Performance (based on actual test results)** | Hudson Tuf-Lite III is less efficient and needs more horsepower, this translates into increased energy costs (up to $12,000 annually) |
| Requires 2-4 fewer fan blades to achieve the same pressure rise | Superior Pressure Rise | Tuf-Lite III fan with same number of blades will be in stall |
| Galvanized hub plates and epoxy coated cast iron blade clamps standard | Premium Materials | Hudson Tuf-Lite III® uses aluminum* blade clamps standard*** |
| 1250 lb | Buckling Load | Hudson Tuf-Lite III–850 lb Hudson Tuf-Lite II–900 lb Hudson Tuf-Lite I®–800 lb |
| 36% larger shank diameter (HP7000 is 8-1/2“) for superior strength — Tested to withstand 73% greater shank bending resistance than Tuf-Lite III | Strength | Smaller shank diameter (Hudson Tuf-Lite III-6-1/4“) |
| Incorporates pigmented resin throughout the blade skin, along with multiple veil layers on both top and bottom surfaces for complete UV resistance | UV Protection | Uses only paint for UV protection, which can flake off over time and expose the blade’s structural fibers to harmful UV rays |
| Molded-in nylon barrier strip resulting in 75%† better erosion rate | Erosion Resistance (Based on actual test results) | Hudson Tuf-Edge that is used in Tuf-Lite II and III blades has higher erosion rate |
* Aluminum is considered unacceptable in many power, geothermal, and chemical processes
** Based on test results comparing aerodynamic efficiency between the Marley HP7000 and Hudson Tuf-Lite III fans at SPX CT Development Center, as well as actual field application † CTI TP97-06 Paper: The Influence of Materials of Construction on Leading Edge Erosion of Fiberglass Fan Blades Used on Cooling Towers
*** Upgrading a Hudson Tuf-Lite III to iron clamps and stainless hardware to match Marley standards requires significant cost increases ($2,800 per fan assembly—based on 336″ diameter 8-blade Tuf-Lite III® pricing)