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Clyde,
Which manufacturer is your unit made by? I have heard this same situation from one of our surrounding area departments. What is has to do with their system is the CAFS inductor. It has pressure differential requirements that are similar to a in-line foam eductor. The differentials fall into line with the cooling of the compressor unit. Their unit cannot be supplied by a 5 inch line unless they are flowing large amounts of water. They must use 3 inch supply line for "bread and butter" residential fires.
I do not thik it is from turbulence.
hi there. My dept. is just looking into cafs. Could someone explain exactly why it is bad to run cafs thru a hydrant supply line versus a dedicated fill valve? Is it aggitation, lack of cooling or just pressures wanting to level out? I just don't totally understand why you can't just cut back your intake valve to a desirable pressure level rather than run it thru a tank fill. Thanks.
Mike,
It depends on the manufacturer. Pierce's Husky does require a pressure gradient for cooling. The Hale does not - but does require high RPMs on pump shaft to drive the compressor. You could regulate incoming volume and psi with an intake valve - if you have one - or by "overdriving" an internal relief valve such as the TPM system from Hale. However this requires continual adjustment by the PO. Running it through a fill valve and the tank is much simpler.
Thanks
Alan Butsch
alan.butsch@montgomerycountymd.gov
Mike,
It depends on the manufacturer. Pierce's Husky does require a pressure gradient for cooling. The Hale does not - but does require high RPMs on pump shaft to drive the compressor. You could regulate incoming volume and psi with an intake valve - if you have one - or by "overdriving" an internal relief valve such as the TPM system from Hale. However this requires continual adjustment by the PO. Running it through a fill valve and the tank is much simpler.
Thanks
Alan Butsch
alan.butsch@montgomerycountymd.gov
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