one tank-two units

Bill NTSG

The check valves require a good amount of vacuum to open. They offer resistance to flow. Some of the spring ball type are worse. I have removed some problem ones and reduced the vacuum gauge reading at the pump by 3 or 4 inches or more. If you can get away with out them by all means , DO.

spl

one tank - 15' away from two units - tank bottom 12" below units - units firing 1.25 and 1.0 - mini pumps

Q? best way to supply both units without problems of air, etc.

John@Reliable

Best way?

You should be able to run one 3/8" supply line close to units and tee off that line.Use flare fittings and flare firomatics. The amount of oil you are using will be handled with this set-up Hope this helps!

spl_2

one line--two units

Someone told me today that you could use one supply line, tee off, and use one return line, tee off. I was always concerned with one unit running, the return oil would pressurize the other pump's return, as well as return to tank. I am not sure what effect this will have the other pump, and if a hazard is created.

JIM F.

I RUN 1/2 LINE EVERYTIME POSSIBLE USING SEPERATE FILTERSAT TANK ALSO WITH MORE THAN 1 UNITS I PUT IN-LINE CHECK VALVES

Unknown

No need to run return lines

with a tank that close to the burners . We use 3/8 copper to a filter near the burners and tee it after the filter . Having a filer right at the tank is a good idea also .

Floyd

TIGER LOOP!!!!!

Will solve all your problems!!!!!!
Run one pipe to one of the units mount the Tiger Loop on that unit and pipe to the second unit.
No air, no primeing, just a lot less headaches for about 125.00

Can't beat it!!!

Floyd

Bill NTSG

Seperate lines

I like to tee off at the tank , right after the filter and run a seperate line to each burner. Single pipe system should be fine. The only time the oil will be below the burner is when the tank is down to a 1/4 tank, right ?

spl_2

tee at tank

Yes, I like this idea, and it is better than coming off the top. The fact that the oil will be below the tank only when the tank is at 1/4 is not a big deal, if all flares are tight. Mobile home furnaces are always above the supply tank with one line systems, and if all fittings are tight, there is not any problem.

J.C.A.

2 burners 1 tank.....

I'd go with what Bill Nye"not the science guy"says , and by ALL MEANS avoid putting a check valve in the line as suggested by Jim F . Check valves in an oil line are a HUGE NO-NO !
Flared fittings only and quality filter will make your burners happy for their lifetime . Chris

Earthfire

I disagree

Check valves are not a no-no in oil lines . In fact if the oil pump is higher then about 3 ft. then the tank bottom I always install one . And if Memory serves me right the pump manufacturers specify a checkvalve if the lift is over 8ft. + - . The check valve are specificly designed for use in oil lines with their unique vacumn requirements. one example is a " HOLD-TITE " 3/8 x 3/8 flare model# 105HCV or 1/2 x1/2 flare mod.# 205 HCV. Chances of getting one at the plumbing supply are low .You will probable need to go to a Mechanical supply house like Johnstone, Sid Harvey , R. E. Michael among others They keep them and other brands on the shelf. A "water" check valve will only cause problems.

spl_2

check valves

Isn't it true that check valves in marginal vacuum (sp?) conditions can cause cavitation, and then loss of prime?

JIM F.

osv valves

up and coming more and more with inspectors are o.s.v. valves if taking feed off bottom of tank.(anti-siphon valves.) here is a set up we did. notice the hole in the top.. using a paper clip or piece of 14ga wire this diaprahm need to be manually open while bleeding. sorry in this picture the are installed upside down. they should be installed with hole facing down.

spl_2

osv's on pump?

> up and coming more and more with inspectors are

> o.s.v. valves if taking feed off bottom of

> tank.(anti-siphon valves.) here is a set up we

> did. notice the hole in the top.. using a paper

> clip or piece of 14ga wire this diaprahm need to

> be manually open while bleeding. sorry in this

> picture the are installed upside down. they

> should be installed with hole facing down.

spl_2

osv's on pump?

I was taught to put osv units hard piped to fuel units because if installed near tank, oil between fuel unit and osv in tank area can expand and cause a lot of pressure on pump seals. If put on pump, then any expansion would bleed back to tank.

Am I mistaken or is the osv's main purpose to guard against seal failure and gravity feed, or any leak in general? Thanks in advance.

todd s

two tanks

Jim you do very neat work and I'm not picking on you but I hope there are valves directly under each tank. This could be a major problem if: settling occurs and iron pipes start to leak or if either tank needed to be shuttoff for service. What I like to do when doing the tuneup is to shut off both tanks then check for flow out of each. You'd be surprised how often one tank has a clog in the bottom.

Bob Bona_4

Jimmy

ya gotta put the filters before the OSV, so they stay clean.Smart move in installing them! I would use 1/2" copper between the tanks, bent in a curve or some such, so there will not be a stressed joint from tank movement..imagine if one of those 3/8 fitting went *dink!*

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Bob Bona_4

Bill is right

a check valve has no place in a properly engineered oil delivery system.

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JIM F.

filters and osv's

just checked out webster site.learn something every day, i set it up this way assuming that osv should be first to prevent a leak any where in line(filter leak,line leak pump leak, etc.) thanks bob
and scott yes there are 1/2 in-line ips fire valves on the bottom facing the wall.
jim f.