[JandS]

Sure I checked mine when I bought it and the tie downs were rated at 5 ton so 5080kg....tank plus water is only around 550kg  so plenty of leeway....straps are rated at 5 ton not 7.5 ton.

[Splash & dash]

Sure I checked mine when I bought it and the tie downs were rated at 5 ton so 5080kg....tank plus water is only around 550kg  so plenty of leeway....straps are rated at 5 ton not 7.5 ton.

The problem is depending on speed of impact that 550 kg tank and water will weigh 10x that with inertia .

[DJW]

Funny isn’t it?
You wouldn’t want your seat belt anchored to one of those noodles they put in the French vans but it’s ok to bodge something that weighs five times your body weight.

[robert mitchell]

Sure I checked mine when I bought it and the tie downs were rated at 5 ton so 5080kg....tank plus water is only around 550kg  so plenty of leeway....straps are rated at 5 ton not 7.5 ton.

Most lashing points on vans are rated to between 125 and 250 kgs , what van do you have?  maybe it was 500kg but even thats unlikely.

[JandS]

Just checked they are each rated at 500kg by the look of it.

[jk999]

Not going for ratchet straps now ,an engineer friend of mine gonna make me some heavy duty metal flat  bars which I'm gonna bolt to floor and bulk head

[mike1986]

Not going for ratchet straps now ,an engineer friend of mine gonna make me some heavy duty metal flat  bars which I'm gonna bolt to floor and bulk head

Expect your insurance to go up. It’s classed as a modification. If it’s strapped in it’s just classed as cargo

[Smudger]

Interesting point about insurance - would they say the same for shelving ?

Darran

[tlwcs]

Interesting point about insurance - would they say the same for shelving ?

Darran

I’m sure if it’s changed in any way from how it left the factory, it’s classed as a modification
Roof racks and tow bars. Depends how snotty the insurance company want to be

[Pete Thompson]

Maths has the answer, and specifically the equations of motion.

We want to know the force generated when 650 kg comes to a dead stop in a crash (about 0.05 seconds) from 30mph
(For SI units, 30mph = 13.441 metres per second)

Force = mass x acceleration

So we need the acceleration, given by the equation of motion

V= U+ at
(V: final velocity, U:initial velocity, a:acceleration, t:time

Rearrange that equation to make ‘a’ the subject and you get

(V-U)/t = a

Acceleration = (0-13.441)/0.05
Acceleration = -268.82 m/s/s
(It’s negative because it’s deceleration)

So, force= mass x acceleration
Force = 650kg x 268.82m/s/s
Force = 174,733 newtons
Or 17.817 metric tonnes.

So assuming you only ever drive at 30mph, your anchor points behind the tank (the front ones won’t be any use of course) must be able to hold 17 tonnes between them.

Seems about right, Ionics video says 1,000 litre system exerts a force of 52 tonnes in a ~30mph crash.

https://youtu.be/9usI6qFzfpo

[JandS]

For a 500kg tank I get just less than a ton.

[mike1986]

Interesting point about insurance - would they say the same for shelving ?

Darran

They usually ask on the insurance quote ‘does the vehicle have internal racking’ so that wouldn’t be an issue I imagine as you have already declared that on the original quote. Having a water tank bolted in is a different matter though

[Pete Thompson]

For a 500kg tank I get just less than a ton.

Show your working

[CleanClear]

Maths has the answer, and specifically the equations of motion.

We want to know the force generated when 650 kg comes to a dead stop in a crash (about 0.05 seconds) from 30mph
(For SI units, 30mph = 13.441 metres per second)

Force = mass x acceleration

So we need the acceleration, given by the equation of motion

V= U+ at
(V: final velocity, U:initial velocity, a:acceleration, t:time

Rearrange that equation to make ‘a’ the subject and you get

(V-U)/t = a

Acceleration = (0-13.441)/0.05
Acceleration = -268.82 m/s/s
(It’s negative because it’s deceleration)

So, force= mass x acceleration
Force = 650kg x 268.82m/s/s
Force = 174,733 newtons
Or 17.817 metric tonnes.

So assuming you only ever drive at 30mph, your anchor points behind the tank (the front ones won’t be any use of course) must be able to hold 17 tonnes between them.

Seems about right, Ionics video says 1,000 litre system exerts a force of 52 tonnes in a ~30mph crash.

https://youtu.be/9usI6qFzfpo

This kingpin (about as thick as your wrist) is capable of pushing,pulling and stopping the 40 tonne trailer its attatched to.

[High-Tower]

Maths has the answer, and specifically the equations of motion.

We want to know the force generated when 650 kg comes to a dead stop in a crash (about 0.05 seconds) from 30mph
(For SI units, 30mph = 13.441 metres per second)

Force = mass x acceleration

So we need the acceleration, given by the equation of motion

V= U+ at
(V: final velocity, U:initial velocity, a:acceleration, t:time

Rearrange that equation to make ‘a’ the subject and you get

(V-U)/t = a

Acceleration = (0-13.441)/0.05
Acceleration = -268.82 m/s/s
(It’s negative because it’s deceleration)

So, force= mass x acceleration
Force = 650kg x 268.82m/s/s
Force = 174,733 newtons
Or 17.817 metric tonnes.

So assuming you only ever drive at 30mph, your anchor points behind the tank (the front ones won’t be any use of course) must be able to hold 17 tonnes between them.

Seems about right, Ionics video says 1,000 litre system exerts a force of 52 tonnes in a ~30mph crash.

https://youtu.be/9usI6qFzfpo

This kingpin (about as thick as your wrist) is capable of pushing,pulling and stopping the 40 tonne trailer its attatched to.

No it isn’t. The trailer has its own brakes.

[KS Cleaning]

Interesting point about insurance - would they say the same for shelving ?

Darran

They usually ask on the insurance quote ‘does the vehicle have internal racking’ so that wouldn’t be an issue I imagine as you have already declared that on the original quote. Having a water tank bolted in is a different matter though

Not all insurance companies penalise you for having a water tank bolted in, funnily enough it’s usually these ‘specialist’ insurance companies who pull your pants down for having it bolted in.

[Granny]

 I Like the  maths, so basically we're all driving around in death traps!
Been nice knowing you

[CleanClear]

Maths has the answer, and specifically the equations of motion.

We want to know the force generated when 650 kg comes to a dead stop in a crash (about 0.05 seconds) from 30mph
(For SI units, 30mph = 13.441 metres per second)

Force = mass x acceleration

So we need the acceleration, given by the equation of motion

V= U+ at
(V: final velocity, U:initial velocity, a:acceleration, t:time

Rearrange that equation to make ‘a’ the subject and you get

(V-U)/t = a

Acceleration = (0-13.441)/0.05
Acceleration = -268.82 m/s/s
(It’s negative because it’s deceleration)

So, force= mass x acceleration
Force = 650kg x 268.82m/s/s
Force = 174,733 newtons
Or 17.817 metric tonnes.

So assuming you only ever drive at 30mph, your anchor points behind the tank (the front ones won’t be any use of course) must be able to hold 17 tonnes between them.

Seems about right, Ionics video says 1,000 litre system exerts a force of 52 tonnes in a ~30mph crash.

https://youtu.be/9usI6qFzfpo

This kingpin (about as thick as your wrist) is capable of pushing,pulling and stopping the 40 tonne trailer its attatched to.

No it isn’t. The trailer has its own brakes.

Its still got to pull it from a standstill.

[jk999]

Jesus what is with you lot why do you all think on negative side all the time ,it was a simple question all I wanted was a simple answer, only thing your all thinking is crashes and deaths ,a window cleaner got killed by touching and electrical cable with his pole,the way I come to think is if your times up so be it ,1 simple question 1 simple answer that's all I want  rant over 😇

[Smudger]

yes - your correct, but thats the point, you may think its safe but it may not be......

others go that one step further and will not accept any alternative to a "crash tested" system

then we get the posters just hoping that any idea they have will be wonderful and cant accept it may have a fault.

if a tank is hard stopped to a bulk head it can't go anywhere - if your having it mid cargo area then you would need more than the standard D rings supplied - JUST TO BE SAFE

hope that helps

Darran