Are all fibre wrapped 4500psi?
- Thread starter Richiemonk
- Start date
3000psi fibres are possible, but you can also find cylinders where someone has changed the regulator. Never make assumptions based on what the cylider looks like.
Check the full markings of the cylinder, the regulator and the burst disk
To be a 4500psi cylinder it should have two pressure ratings in the markings
e.g. I have the following markings on cylinders
48cu alumniums:
Labels show 3000psi and stamps show PW207 PH311BAR (3002psi / 4510psi)
13ci aluminium:
Labeled 3000psi is stamped PW205PH310BAR (2973psi / 4496psi)
Fibres:
PW310PH466BAR is a cylinder with a working pressure of 310BAR/4496PSI and maximum test pressure of 466BAR/6758PSI
PW345PH517BAR is a cylinder with a working pressure of 345BAR/5003PSI and maximum test pressure of 517BAR/7498PSI
Burst disks:
My 3000psi aluminium have 1.8k & 5k burst disks, on the regulators except the 13ci which only has a 4.5k disk
My fibres have 1.8k and 7.5k burst disk
The lower burst disk is the protect you & your marker from the regulator output, the higher to protect the regulator, you & your marker from an excessive input. You must not decide to overfill a 3000psi cylinder just because the safety rating & burst disk are higher.
You can only fill to the lowest common denominator out of your cylinder working pressure, regulator and the high pressure side of the burst disks
Check the full markings of the cylinder, the regulator and the burst disk
To be a 4500psi cylinder it should have two pressure ratings in the markings
e.g. I have the following markings on cylinders
48cu alumniums:
Labels show 3000psi and stamps show PW207 PH311BAR (3002psi / 4510psi)
13ci aluminium:
Labeled 3000psi is stamped PW205PH310BAR (2973psi / 4496psi)
Fibres:
PW310PH466BAR is a cylinder with a working pressure of 310BAR/4496PSI and maximum test pressure of 466BAR/6758PSI
PW345PH517BAR is a cylinder with a working pressure of 345BAR/5003PSI and maximum test pressure of 517BAR/7498PSI
Burst disks:
My 3000psi aluminium have 1.8k & 5k burst disks, on the regulators except the 13ci which only has a 4.5k disk
My fibres have 1.8k and 7.5k burst disk
The lower burst disk is the protect you & your marker from the regulator output, the higher to protect the regulator, you & your marker from an excessive input. You must not decide to overfill a 3000psi cylinder just because the safety rating & burst disk are higher.
You can only fill to the lowest common denominator out of your cylinder working pressure, regulator and the high pressure side of the burst disks
Last edited:
Wow, thanks for that Answer bud 
It looks like the reg has been changed, but im not gunna stick a 4500 reg on it and start buggering around... thats big bangy stuff and i quite like life.
God has decided on 3000 psi so thats what i'll stick with having read what u have put in that post.
Many thanks for taking your time out to write mate. it is appreciated
Rgds
It looks like the reg has been changed, but im not gunna stick a 4500 reg on it and start buggering around... thats big bangy stuff and i quite like life.God has decided on 3000 psi so thats what i'll stick with having read what u have put in that post.
Many thanks for taking your time out to write mate. it is appreciated
Rgds
You could replace the regulator with a 300-bar version, although you'd be wise to let a qualified airsmith to do the swap. Having 50% more air available will prolong your time on the field...
As long as the 310BAR is in the markings as the working pressure then there will be no issue with replacing the regulator,
However it is a task best left to those who know what they are doing, it could be threadlocked, and even if it isn't threads could be damaged.
It should obviously be drained of air, but regulator threads are designed to depressurise safely if you manage to unscrew one while pressurised. (First it will be almost impossible to turn when pressurised even if not threadlocked, then if it is at a lower pressure there is a gap in the thread to allow any air to escape before it can be fully unscrewed,)
The easy answer is to leave as is and only fill 3000psi
The alternate is to have it swiched so regulator & cylinder match
However it is a task best left to those who know what they are doing, it could be threadlocked, and even if it isn't threads could be damaged.
It should obviously be drained of air, but regulator threads are designed to depressurise safely if you manage to unscrew one while pressurised. (First it will be almost impossible to turn when pressurised even if not threadlocked, then if it is at a lower pressure there is a gap in the thread to allow any air to escape before it can be fully unscrewed,)
The easy answer is to leave as is and only fill 3000psi
The alternate is to have it swiched so regulator & cylinder match