Booster pump for cooling coil

[BearsFan2]

Hello All, I have an application where I need to install a new cooling coil in an existing 30% water/ glycol distribution loop. The existing distribution loop has a 50 psig differential pressure set point across the supply and return piping maintained by a VFD driven pump. At full flow the new coil needs 90 psig. The existing pumps are not sized to provide any added pressure. I want to install a booster pump to the supply pipe to the coil to provide this added pressure.

Who makes this type of pump? Any pitfalls with this approach? All help is appreciated.

 

[trashcanman]

Good spot for Primary-Secondary pump. Secondary pump will handle the new coil, and not upset the main loop. Pumps by Bell & Gossett, Taco, Armstrong, Goulds will work.
I have never heard of a coil requiring 90 psig. Must have lots and lots of rows.

 

[DRWeig]

We seen coil loop pumps often. What you're proposing is normal. The trashcanman gave you good pump manufacturers.

Best to you,

Goober Dave

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[EnergyProfessional]

must be a huge system a 50 psi and 90 psi coil drop.

I (and all my maintenance staff) would recomment to never isntall Taco / Armstrong. Unless leaking is not a problem. Especially since glycol leaks even more than water.

 

[ChasBean1]

Um, forgive me for being a moron… 50 psid DP (pounds per square inch, differential) in your existing loop is extremely high. What device needs that DP? 90 psid for your new coil is 208’ head, where a normal coil might be 10’-15’ head. Are you talking about a process outside of HVAC?

 

[BearsFan2]

Hello All, yes this is a special coil, 2 stage coil, 68 gpm at 90 psig data is straight from the manufacturer. This is 100% OA unit cooling aircraft(jumbos) parked at the gate.

 

[ChasBean1]

Ok. I'd suggest Grundfos. And yes, series pump installation is appropriate to boost pressure at this coil.

 

[BearsFan2]

Thanks for comments