Ask the Question

zammtheman · Joined: 03 Mar 2008 Posts: 20 Location: uk/norwich

Hello All
I have had my oil boiler changed from a two pipe system to a one pipe sytem recently ie the de-aerator was taken away because it vented to atmosphere and it stunk the house out and now i have just one feed pipe to the burner, my problem is the oil tank is probably about 100mm below the boiler its been working ok for a couple of months but now the oil level has gone below the quarter of a tank mark the boiler has locked out and it sounds like its a starvation problem?? i was wondering whether it would be better to lift the tank up (which i dont fancy doing ) or can i put a pump on the supply line
hope that made some sense
thanks for any replies
chris

thescruff · Moderator Joined: 03 May 2003 Posts: 4401 Location: Bath

Raising the tank is the obvious solution , but you should't let it get down the 100mm in the first place because you stir up any **** in the bottom of the tank, which will give you allsorts of problems

AlanE · Posted: Tue Apr 15, 2008 7:45 am Post subject:

Sounds like you had a Tigerloop installed internally which is not permitted.

Why not fit a GS2000 designed for fitting internally as it doesn't vent to atmosphere.

zammtheman · Joined: 03 Mar 2008 Posts: 20 Location: uk/norwich

Hi Alan,Scruff
I did have a tiger loop fitted inside hence the smell but i had that taken out, so in your opinion if i fitted another tiger loop would that help with the flow of oil? the reason i ask is because when i had a tiger loop i could easily let the oil run down to the last 100 litres with no problems but there must be atleast 300 litres left in my tank and the boiler sounds like its starving, when the engineer took the old tiger loop out i had to buy a new oil pump because he said there wasn't a tiny screw on the pump he could find to take out to convert it to a one pipe (apparently there is one)?? or do you think it might be the new pump not sucking hard enough??
i am really trying to avoid moving the tank higher because as from tomorrow there will be nearly a 1000 litres in it

thanks again

chris

AlanE · Posted: Tue Apr 15, 2008 9:11 pm Post subject:

Chris NOT a Tigerloop unless it is fitted outside. Use a GS2000 if you fit it internally.

Not all pumps have an internal screw in the bypass. What make/model of boiler and make/model of oil pump (if not a Riello boiler).

How far is tank away from boiler and diameter of oil pipe?

zammtheman · Joined: 03 Mar 2008 Posts: 20 Location: uk/norwich

Hi Alan
the boiler is a merlin 40/60 monoflame and is about 18yrs old
the pump is a danfoss BFP51R3 i think the box was taken away?
the tank is approx 18 metres away but as i said before it is about 100mm lower than the boiler
the supply pie from tank to boiler is in 10mm
really appreciate your input

regards
chris

AlanE · Posted: Wed Apr 16, 2008 8:28 pm Post subject:

I recon you mean a 21R3 and yes that does, or should have, a bypass screw.

I wouldn't have thought the boiler would have locked out due to oil starvation with 18 metres pipe even if the oil level was below boiler level. Through air maybe but only because the joints were letting air in.

Who took the Tigerloop out? If a qualified engineer was he aware the boiler locking out and if so did he connect a vacuum guage to pump inlet. This can show more than many things the correct operation of the boiler.

zammtheman · Joined: 03 Mar 2008 Posts: 20 Location: uk/norwich

Hi Alan just had a delivery of oil and i fired the boiler up and it worked straight away, so does that tell you its the tank not quite high enough??
I did have an engineer take the tigerloop out but it wasn't locking out when he did that, its only since the oil level dropped then it locked out.
he did put a pressure gauge on it to see if we could get away with not putting a bypass screw in but it went off the scale so i had to buy a new one with a screw supplied.
I think i will have to consider either raising the tank or your suggestion GS2000

Regards

Chris

thescruff · Moderator Joined: 03 May 2003 Posts: 4401 Location: Bath

The third option is to run a second line back to the tank.

By far the best option is the raise the tank.

All you need is a two rows of 150mm hollow blocks and half a dozen 150 x 100mm pre-cast concrete lintels

zammtheman · Joined: 03 Mar 2008 Posts: 20 Location: uk/norwich

Thanks again Very Happy

AlanE · Posted: Thu Apr 17, 2008 8:15 pm Post subject:

Chris

Please Please don't tell me you had the pump replaced because of a Danfoss bypass screw. I've got quite a few, every pump comes with one!! I would have thought anyone repairing oil boilers likewise would have accumalated a stock of these.

What I cannot understand is it is only used on two pipe set ups. Leave it in place and the pressure goes sky high and damages the pump. It MUST be removed on single pipe systems so cannot for the life of me understand need for pump being changed because of this missing screw.

zammtheman · Joined: 03 Mar 2008 Posts: 20 Location: uk/norwich

Hi Alan
Yes i had to have a new pump because when he took the tigerloop out the pump would of been set up for a two pipe(with screw) and when he connected the new one pipe and put a gauge on it thats when he realised there was a problem. But i had to look up on the internet for him and it was only then the penny dropped about the screw, i dont think he realised there was one Rolling Eyes

but thats when the problem came about he couldn't find the screw to take out hence why i had to have a new one with no screw,but like you say it did come with a screw so if i ever wanted to go back to a two pipe i could.
You just cant get the staff these days Very Happy

Regards
Chris

thescruff · Moderator Joined: 03 May 2003 Posts: 4401 Location: Bath

ANd this guy is Oftec registered Shocked