high vacuum advice tiger loop 2 stage pump

captainjdog

Been troubleshooting a boiler for a few months, but i think I finally have it narrowed down. The pump is 11 feet above the tank and a run of about 20 feet. Its a 2 pipe system with a single stage suntec pump. Just ran new 3/8s lines & new filters (2 inline). Its currently pulling 13 in. hg vacuum. The system fails at 18 in hg which takes about a month. It doesnt take long and I'm always nervous I will come home to a frozen house.

I can't figure out a way to lower the vacuum any more so I ordered a 2 stage pump because 13.in hg - 18 in. hg is too high for the single stage. Apparently 2 stage is good for 17 in hg. vacuum.

Do you think this system is a prime candidate for a tiger loop?

Or would a booster pump work better?

I have zero experience with either.

My goal is to reduce the required maintence on the system and improve reliability. My thoughts are a tiger loop would extend filter service and reduce vacuum on the pump. Im not sure if anyone can chime in on the reduced vacuum using a tiger loop. I would think I still can't get around the 11in hg required to lift the oil 11 feet.

Any advice before I head down this road?

Thanks

776v63

Webster Service Tech Handbook.

Relevant information starts around page six.

http://www.websterfuelpumps.com/pump_docs/LL4640.pdf

Seems to indicate a 2 stage would be better. Possibly larger oil line also.

Bob Bona_4

This is a perfect candidate for the Loop, I've done overhead shop furnaces with this exact scenario with total success. I would do either the Tiger Ultra with integral spin on filter and hg gauge or 1 spin on filter at tank. The extra filter adds unnecessary restriction- something you don't need. I would put on the 2 stage pump, 3/8" ID line would be better if doable, otherwise see how it pulls with the 1/4".

I've got systems running like this for almost 25 years.

captainjdog

Thanks for the response Bob, and for the information 776v63.

I'll post my successful results

spoon22

Tigerloop is the way to go by only pulling 1 pipe you will only pull the firing rate of furnace through the line which will drop the vaccum .