day tanks

Dave Palmer_3

is there any rule of thumb or formula for setting pressure switches on day tanks? thanks Dave

Brad White_9

Do you mean for fuel oil?

Not sure I gather the question, but if a day tank the function is to provide a ready source of fuel to be drawn upon by a generator or boiler when full storage nearby is impractical. Day tanks work normally off of level controllers, not pressure. Levels are usually between the middle two (2) out of four (4) level tappings. The highest one is the high level alarm (below a gravity overflow) and the lowest tapping is a low-level alarm, saying your transfer pump has failed or cannot keep up. The middle two are operating high and low limits to stop/start the transfer pumps.

Is that the function of what you are describing?
Normally day tanks do not have a pressure control they are vented to atmosphere and should never see pressure above 5 psig.

Did that even approach your question? Let me know.

Brad

Dave Palmer_3

hey Brad

yes its a day tank feeding 3 furnaces. Works on inches of water column. Lift pump is on ground level,pulls fuel from underground tank up into day tank. Diapham switch tells pump when to pump to keep fuel in day tank. Dave

Brad White_9

You know, Dave

I have done maybe dozens of day tank installation designs and never one on pressure. Seems to "iffy" to me -but may be entirely normal! The part that gets me is the conversion of inches of water to inches of oil. Not just by weight (7.X per gallon oil versus 8.34 for water) but viscosity....

Sorry, cannot help you on this one, except to say maybe you can turn the pot switch at various levels via the sight glass and see what works/corresponds to a given level.

Let me know what you find out, would you? Always learning after 28 years in the business. I will stay tuned to see what others have to say...

Brad

Dave Palmer_3

in

N.E. they are pretty common,think of the switch as a pressuretrol no pressure unit runs more pressure and it shuts off.Dave

clammy

day tank

If your doing a true day tank there is no pressure setting unless your doing a lift pump and pressure switches on your burners to bring the pump all that i 've every done where all set very low pressure about7 to 10 psi and when doing so make sure you use a oil safewty valve or you may be kissing the pump seal good bye and or paying for a nice oil clean up i usually only did single pipe off the pump and then osv and tiger loop never have any promblems .Sorry to say as of 2 years ago i was unable to locate a replacement day tank set up for a existing job whose tank went and was unable to get in touch with the companyand that was any hite day tanks i believe so we juat went with a lift pump and relay and pressure switches and tigerloops worked grat 2 stage j pump did 2 units 72 gallon hot water heater and a 19.8 gph 1911 hb smith steamer 2400000
btus and never had another oil supply promblem peace and good luck clammy

Brad White_9

I can understand that

but I am in Mass. where I practice, granted commercial/institutional work. In the applications I use it is all level control. Being an open tank there is little pressure anyway, and level (high or low) are key criteria. Always something new to me!

I will ask our Preferred Utilities Rep and Hayes Pump Rep about pressure applications. Ever learning.

Thanks!

Brad

clammy

pressure switch

I know the lift pump day tank set you are talking about ,a small tank hangs on the wall and tapped in the bottom of the tank in a pressure switch which will turn the lift pump on those are if i remenber correctly are scaledin Hg correct i really can,t remenber what i had set it to but i beleiev it was .7 .On that type of set up off of the tank to the burners is usually gravity still with a osv but on the discharge of the lift pump into the tank i believe it was only 10 to 15 psi , but make sure you have a clear overflow
from your day tank to you oil tank if not i would probably go with a lift pump 2 pipe off the tank and use pressure switches on the burners to activate the lift pump do it single pipe with a osv and a tiger loop on each unit run your lift pump at around 10 to 15 psi and install a permanet discharge and vacume gauge usually i'll use a taco circ relay with the indicator lights for the lift pump motor makes it a little easier when trouble shooting loud in enivorments or tight spaces good luck and peace clammy

oil-2-4-6-gas

Sid Harvey

Sid Harveys' sells a daytank set-up which is controlled by a pressure swich --its a whole "kit" i had put in a few --and yes they are controlled by a "pressure switch" --in w.c. -the switch should be replaced every 3 years --the tank has a little vent on top ----
you adjust the switch as per install instructions

clammy

sid harvey

to the last post i know the sid set up your talking about but was wondering about those ne hite day tank set up the last sid harvey type set up i did was because we coulkd not get any parts or even get hold of the ne hite for anything thanks peace and good luck claammy

Dave Palmer_3

thats

the set up I have,existing. Switch went bad,replaced the switch and set it to the same #'s as the old one. But wondered what formula would you use for setting it? It's mounted 2 feet above 2 units and 15 ft. above the third. All have OSV's.Just wondering,Dave