Hi All,

I have contacted a few companies to get quotes for replacing our oil tank (i'd have liked to DIY, but there are too many other projects demanding my immediate attention), and one of the companies is going to send a little man out to do a survey, but prior to the survey he's suggested it might be worth fitting a tigerloop as even though the installation doesn't need one (HRM Wallstar about 4' above (ground level) tank outlet) it would save the pump having to work so hard.

I had a quick look at a couple of sites with details of the Tigerloop, and they seem to have added a lot of what smacks of greenwash to their marketing in recent years.

Does the team think it's worth installing one, either to save wear & tear on the pump? Or to save a little fuel / lower emissions?

TIA

Chris

On Fri, 30 Aug 2013 02:28:50 -0700 (PDT), wrote:

... prior to the survey he's suggested it might be worth fitting a
tigerloop as even though the installation doesn't need one (HRM Wallstar
about 4' above (ground level) tank outlet) it would save the pump having
to work so hard.

How old is the boiler? How often has the pump been replaced? What is
the pump spec in regards oil lift? How long and how big is the feed
line? Many elbows etc.

Does the team think it's worth installing one, either to save wear &
tear on the pump?

I think the old adage "if it ain't broke don't fix it" applies,
depending a on the answers to the above questions.

Or to save a little fuel / lower emissions?

Can't see how it's going to do either of those. Fuel consumption is
basically down to jet size and oil pressure. Emissions down to
quality of oil and how much air is let in. Pressure and air should be
both adjusted to produce the best burn, I fail to see how inlet
pressure can affect those settings. The pump, in single pipe mode,
will be circulating the oil within itself via the bypass.

This seems a reasonable and clear explantion of why tiger loops might
be required (once you get past the first couple of paras):

http://www.westwoodproducts.com/tigerloop_article.htm

Certainly when we get a delivery of oil the level in the sight tube
drops by about a cm in the 24 hours afterwards then remains stable. I
put this down to air in the fuel that settles out.

The 4' lift you have with an empty tank is about 0.13 bar of pressure
reduction. That's tiny I doubt that little pressure reduction will
release much dissovled air. Note the empty tank, with it full you may
have positive pressure at the pump or be very close.

--
Cheers
Dave.

On 30/08/2013 13:51, Dave Liquorice wrote:

Certainly when we get a delivery of oil the level in the sight tube
drops by about a cm in the 24 hours afterwards then remains stable. I
put this down to air in the fuel that settles out.

Your suppliers presumably sell you oil by volume. Is it in their
interests to include some air in the oil deliberately?





The 4' lift you have with an empty tank is about 0.13 bar of pressure
reduction. That's tiny I doubt that little pressure reduction will
release much dissovled air. Note the empty tank, with it full you may
have positive pressure at the pump or be very close.

On Fri, 30 Aug 2013 15:12:21 +0100, GB wrote:

Certainly when we get a delivery of oil the level in the sight
tube
drops by about a cm in the 24 hours afterwards then remains
stable. I
put this down to air in the fuel that settles out.

Your suppliers presumably sell you oil by volume. Is it in their
interests to include some air in the oil deliberately?

1 cm equates to about 25 l. But most of it will get entrained during
the stiring up that occurs when the fuel falls the best part of 3'
from the fill cap to the bottom of the almost empty tank. Fill rate
is proably in the order of 400 l/min...

--
Cheers
Dave.

"Huge" wrote in message
...
On 2013-08-30, wrote:
Hi All,

I have contacted a few companies to get quotes for replacing our oil tank
(i'd have liked to DIY, but there are too many other projects demanding
my immediate attention), and one of the companies is going to send a
little man out to do a survey, but prior to the survey he's suggested it
might be worth fitting a tigerloop as even though the installation
doesn't need one (HRM Wallstar about 4' above (ground level) tank outlet)
it would save the pump having to work so hard.

I had a quick look at a couple of sites with details of the Tigerloop,
and they seem to have added a lot of what smacks of greenwash to their
marketing in recent years.

Does the team think it's worth installing one, either to save wear & tear
on the pump? Or to save a little fuel / lower emissions?

Waste of money.

+1

On 30/08/2013 18:31, harryagain wrote:
"Huge" wrote in message
...
On 2013-08-30, wrote:
Hi All,

I have contacted a few companies to get quotes for replacing our oil tank
(i'd have liked to DIY, but there are too many other projects demanding
my immediate attention), and one of the companies is going to send a
little man out to do a survey, but prior to the survey he's suggested it
might be worth fitting a tigerloop as even though the installation
doesn't need one (HRM Wallstar about 4' above (ground level) tank outlet)
it would save the pump having to work so hard.

I had a quick look at a couple of sites with details of the Tigerloop,
and they seem to have added a lot of what smacks of greenwash to their
marketing in recent years.

Does the team think it's worth installing one, either to save wear & tear
on the pump? Or to save a little fuel / lower emissions?

Waste of money.

+1


I suspect that the pump wear will relate to the number of revolutions
which will be the same.


--
Michael Chare

On Sat, 31 Aug 2013 00:21:16 +0100, Michael Chare wrote:

I suspect that the pump wear will relate to the number of revolutions
which will be the same.

If there is large lift and/or a long bendy/constricted pipe run there
is some risk of cavitation in the pump. You don't want that as it
will damage the pump.

I'm struggling to work out how a tigerloop would stop cavitation, the
only thing lifting/pulling the oil is the pump. AIUI a tigerloop
removes actual bubbles but cavitation is caused by the low pressure
on the pump parts releasing dissolved gases, when the pressure goes
back up the gas redissolves...

--
Cheers
Dave.