Is there a vent alarm on this Roth tank?

D107

This is a Roth tank. If there isn't one, I guess we'll have to get one. In the right hand corner --unseen in closeup photo--is a small 2" high plastic cylinder. Is that it? See 2nd photo.

Thanks,

David

Ron Huber_2

alarm

Vent alarm is cast aluminum part that the vent line is coming off of, plastic cylinder is a leak detection gauge,indicator will pop up in the clear plastic section if the inner plastic tank developed a leak which will cause the indicator to pop up from the pressure caused by the leak.

RonWHC

Don't see

a vent-a-larm. And. The vent line is smaller than the fill. That's a no-no.

Alan_11

Vent alarm

There might be. If the second tapping from the left is the vent then the vent is piped larger than the fill which is a good thing. Loosen the plastic union with a wrench and you should be able to tell if the 2 inch riser is made into a vent alarm or not. It looks like it is ,because the silver visible on the full 2 inch pipe is higher than the other piping with the reducing coupling.

Paul Fredricks_3

The short silver fitting on the smaller pipe is the vent alarm. They are much smaller than a standard alarm. They sit very low in order to make up for the large plastic fitting that would make a standard vent alarm sit too high.

That vent pipe should be the same size as the fill, but you'd have to see what local code says.

D107

tank diagram shows 2 inch size for BOTH fill and vent

so what is the downside of the vent line being smaller? Does it effect the viability of the vent alarm? Can't see why they used a smaller line, unless to avoid making a slightly bigger hole in the wall which would have been relatively easy.

Or perhaps the smaller line is the fill; seems to be piped in reverse of the diagram.

Thanks,

David

Paul Fredricks_3

The idea is so that the tank doesn't pressurize during a fill. We always use 2" fill and vent, but I believe here in CT you can use an 1 1/2" vent on a single 275 gallon tank. I believe this code changed to 2" and then back to 1 1/2". Could even be 1 1/4", I don't remember.

NFPA states that the vent pipe will be at least as large as the fill pipe, but not smaller than 1 1/4".

Al Letellier_9

vent alarm

Look like there is one but to be sure, use the blower side of a small vac and introduce air into the fill side. You should hear the whistle.
In Maine, we have to pipe these with both lines 2" if that is what the manufacturer calls for.
IF there is oil in the tank, I doubt an oil company would have filled it without a whistle, but you never know......

D107

Wall's observations have been verified

Thanks all for your informative answers. The smaller pipe is the one with the vent alarm, so that definitely has to be made 2".

While that gets fixed, I'll probably get an OSV installed, change the burner feed to 1/2" from 3/8" and hard pipe suction assembly. Note that Roth has revised their install manual this year; among other things it has a checklist of important install specs that the installer has to sign off on and submit with the warranty sheet.

Thanks,

David

Patchogue Phil_29

Capacity?

How many gallons does that tank hold?

I'm thinking about getting a second tank (I have a 275) to buy more oil when price is lower. I do not have a basement (tank is in garage), so I am not sure I can use a config with the tank height so high.

D107

It's a 275 gallon

--the DWT 1000L which is 61"H but go to their site:

http://www.roth-usa.com/usa

and look at their brochure which also lists a DWT 1000LH which is 54"H, also 275 gallon.

David