# Twin underslung tank system (1 Viewer)

#### WallaceandGromit

Hi all, I've noticed that a lot of vans only have space for 2 7 kg bottles as I am away for a month at a time at least it could pose problems, especially in winter. So I was thinking of linking 2 25 kg or bigger underslung tanks together with a change-over valve like the gaslow system I have in my WB, is this possible?

#### TerryL

LIFE MEMBER
Anything is possible! But with that much gas you won't be able to go on the Channel Tunnel.
It all depends on how much space you've got underneath.

Who measures the tanks on the tunnel?

We have 2x 11kg (22kg) cylinders that equals 44L of gas and this lasts us around 2.5 months in almost continuous use though we do have a small fridge freezer not a tal one and we do use gas a lot as we tend to use aires and pub stops

So 2 x 25kg = 50 Litres whereas our friends have a single 70L underslung tank so why have the extra weight

Also on the Tunnel as long as you can turn the gas off and it is NOT used for traction you're fine

#### Lenny HB

LIFE MEMBER
We have 2x 11kg (22kg) cylinders that equals 44L of gas and this lasts us around 2.5 months in almost continuous use though we do have a small fridge freezer not a tal one and we do use gas a lot as we tend to use aires and pub stops
That's very low we have 2 x 14kg cylinders approx 56lt. One cylinder lasts us 15 days and our winter camping is done in Spain or Southern France so don't use it much in cold weather.
Also on the Tunnel as long as you can turn the gas off and it is NOT used for traction you're fine
Limit of 90 Lt on the Tunnel.

#### Bessy765

1 x 25 ltr , 1 x 30 ltr. Both with remote valve control.

#### Reallyretired

Can't quite understand the OP. Surely if you run low on gas while away you just refill.
We have 2x11kg and easily enough for a month most of the time but usually refill when less than half full.

#### gus-lopez

Who measures the tanks on the tunnel?
It is 47kg max per tank = 93l or a maximum total of 50kgs= 99l itre is states that eurotunnel staff will check gauges or remote indicators & any vehicle without them will be refused.

****The quantity will be checked via the gauge or remote indicator but if neither are present, the vehicle will be refused.****

****Note:
All containers and/or gauges/indicators must be of easy access by our staff for any check. Gas containers must be switched off whilst travelling and connection systems must be in good condition. Opening the container tap or using domestic services as described above is strictly forbidden until the vehicle has unloaded at the arrival Terminal****

here:

Looks like no one is doing the job correctly?

#### Itsmcb

Heating uses the most gas. I used a whole 7kg bottle in 4 days in sub zero temperatures.

#### Bessy765

Around the £2000 mark not sure as had a lot of other work done At the time. We also had the system set up so we could use a bottle in the locker for gas if on a site for a long time and did not want to have to take the van off site.

for more info on my set up speak to Tom Donovan RV installations excellent workmanship.

#### dunnah01

Around the £2000 mark not sure as had a lot of other work done At the time. We also had the system set up so we could use a bottle in the locker for gas if on a site for a long time and did not want to have to take the van off site.

for more info on my set up speak to Tom Donovan RV installations excellent workmanship.
Those tanks look really exposed - I'd be concerned about something hitting them so would want some form of protective skid-plate. The hanger bars look a bit too flexible aswell.

#### Bessy765

It is the approved fiat fixings the controls face rearwards and they have a heavy coating of protective anti chip paint. They have covered over 15,000 miles and show no sign of any problems. Although I had them fitted professionally as an retired engineer Ihave no concerns about the durability of the installation (and I am a fussy bugger)

It is 47kg max per tank = 93l or a maximum total of 50kgs= 99l itre is states that eurotunnel staff will check gauges or remote indicators & any vehicle without them will be refused.

****The quantity will be checked via the gauge or remote indicator but if neither are present, the vehicle will be refused.****

****Note:
All containers and/or gauges/indicators must be of easy access by our staff for any check. Gas containers must be switched off whilst travelling and connection systems must be in good condition. Opening the container tap or using domestic services as described above is strictly forbidden until the vehicle has unloaded at the arrival Terminal****

here:

Looks like no one is doing the job correctly?
the min wage spotty 18 year old who checked us said is the gas off yes i said and turned the hob on by the time id turned it on he was gone

#### Jev88

I have 275 litres in underslung tanks

But not everyone has the ground clearance of an RV.

Had to replace one 80? Litre tank and all in (Tank, fittings, disposal and a 225 litre refill was about £1,000).

#### CazPaul

Those tanks look really exposed - I'd be concerned about something hitting them so would want some form of protective skid-plate. The hanger bars look a bit too flexible aswell.
I thought you had to have a frame or something protecting them too?

#### Bessy765

Whilst nearer the front subframe the plastic fuel tank is lower than the tanks. If you had a frame around and crashed the frame could buckle and damage the tank. There is a minimum clearance from the bottom of the tank to the ground. And both tanks are higher than that.

#### cmcardle75

LIFE MEMBER
Propane tanks are massively stronger than anything else on your vehicle. Your fuel tank is made of crepe paper in comparison.

Excactly

#### Basildog

LIFE MEMBER
Whilst nearer the front subframe the plastic fuel tank is lower than the tanks. If you had a frame around and crashed the frame could buckle and damage the tank. There is a minimum clearance from the bottom of the tank to the ground. And both tanks are higher than that.

View attachment 670524
I would be interested in what ground clearance you actually have ?
The picture might be deceiving but as others have mentioned they certainly look low .

#### Bessy765

I’m no David Bailey,will check and post.

#### Bessy765

This is the lowest one the other one is about 100 mm higher. The minimum clearance to comply is 225 mm I belive. This is the mounting for the Fiat heavy chassis the horizontal straps are 8mm.

#### Basildog

LIFE MEMBER
View attachment 673171

This is the lowest one the other one is about 100 mm higher. The minimum clearance to comply is 225 mm I belive. This is the mounting for the Fiat heavy chassis the horizontal straps are 8mm.
That’s fine it was that other picture making it look low
200 is the minimum clearance.

#### Bessy765

Sorry the other one is 10mm higher.

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