If you must use one word to describe D35 Hydra Cell pumps, then
that's the word. The
D35 Hydra-Cell™ Pump, capable of precision flow rates from 4 to 36.5 GPM at discharge
pressures from 50 to 1200 PSI is used by the US Navy's Virginia
Class Series of Nuclear Attack Submarines for 1st and 2nd
pass reverse osmosis and payload tube drain pumps.
While that might be one of the coolest D35 Hydra Cell pump applications, their unique sealless, pentaplex design results in significantly quieter and smoother pumping performance compared to piston, plunger and progressing cavity style pumps. Their sealless, compact design ensures reliability and minimal maintenance costs.
Common D35 Hydra Cell pump applications include pumping lime and carbon slurry for flue gas desulphurization (wet FGD) at incineration plants, centralized high pressure water system pumps in the food and beverage industries and aerosol can filling applications; it is the sealless design which makes it so versatile and there is no other pump like the D35 Hydra Cell pump.
As with all Hydra-Cell pumps, the D35 can tolerate a closed inlet while running, pump fluids in excess of 200°F, and operate dry without causing any pump damage.
The only pump components exposed to the process fluid are the elastomers and check valves; the D35 has ten check valves to control the flow amongst its' five pumping chambers. With the possible exception of PTFE material, the elastomers are not considered to be a wear item; they are only damaged when the pump is over-pressurized or when the fluid pumped is incompatible with the elastomer. The check valves will typically last about 1 year of continuous operation, which is approximately 8760 hours. Check valve wear is not "sudden", it is a gradual process based upon decreased efficiency, thus the flow rate or pressure (whichever you are monitoring) will become rougher and you will know its time to replace the check valves.
If your fluid is aggressive or abrasive the frequency of check valve replacement might be closer to 6-9 months. When pumping concentrated limestone slurry continuously for FGD applications our customers typically replace their check valves every 8-9 months. As you can see from the following list, we offer several material options for the check valve assemblies.
Check valve replacement requires about 2 hours and can be accomplished "in field" without the need for special tools. Their cost is significantly less expensive than mechanical seals and there's no need to send the pumps out for repair. You can input a D35 Hydra Cell pump part number (refer to the last page of the D35 Catalog file) into our Hydra Cell repair kit part numbering and costing tool; here's an example for a replacement kit for a pump having ceramic check valve assemblies:
You will note we offer three kits and usually only the valve kit is required, however many customers prefer to purchase the complete kit (combination of valve and diaphragm kits) because they figure once they have the pump head off, they might as well replace everything. With the example above perhaps our spray drying customer would require (2) kits annually totaling $4000. Compare that to replacement of mechanical seals or subsequent pump damage or fugitive emissions due to leakage from damaged seals.
We can supply D35 Hydra Cell pumps mounted to motors with baseplates in both direct drive and belt drive configurations.
Use our Hydra Cell pump inquiry form to provide us with the information we require to provide you with a detailed proposal; we typically respond the same day. If you prefer, call us and speak to a sales engineer immediately.