That sounds about like the equivalent of building a Meth lab.Basically, like most other tradesmen, I soon discovered the Paslode rip-off, to wit that Paslode are retailing butane/propane mix at around 400 times its actual market value in their 'fuel cell' containers. Here, in Ireland, a twin pack of cells for the IM350 gun costs around €45 (about $52) for 60g of gas mix. Contrast this with the 350g of the same mix in a cylinder for a plumbers' burner gun, which retails for €3.99 (under $5).
Confronted with this blatant con-trick by Paslode, my son and I decided to investigate a safe, reliable and cost-effective methodology for refilling the cells.
Here are our results:
First, you CANNOT simply pipe up the gas mix from one cylinder to the other; the pressure differential is not high enough to transfer much mix, or indeed any at all.
Boyle's Law determines the behaviour of gases confined within vessels and, to be able to fill one cylinder from another, there requires to be a substantial pressure difference so that, when equilibrium is reached in the system, some mix has moved from the full to the empty container. If you just connect the empty to the full at room temperature, very little happens !
The secret is to expel the residual gas from the 'empty' cylinder by holding its valve in the open position (we devised a simple clamp which holds four cells in the open, vented, position) at an elevated temperature. A small tank of boiled water achieves this in about 30 seconds. Removing each cell from the clamp then closes its valve and creates a partial vacuum in the cell as it cools to room temperature.
Further cooling, with the valve still closed, (30 minutes in a regular home freezer) then enhances this vacuum. (just as a test, if you open one of the valves at this point, you will hear the inrush of air as the vacuum is destroyed.)
We bored the regulator channel out of the head of an old plumbers' burner gun to get a flow of liquefied gas at 'neat' pressure, and connected this via 8mm copper tube to a simple outlet sealed with an O-ring to form the joint to the 4mm diameter Paslode valve on the top of the cells. Clamping a cold, evacuated cell on to the outlet then allows the vacuum to suck in some liquid mix and recharge the cell.
You don't get the full 30g transfered (average is around 16g, depending on how full the source cylinder is) but it's a useable charge. We reckon to fill around 10 cells from a €3.99 cylinder. That's €0.39 (50¢) a cell as opposed to €22.50 ($26) in the store.
The apparatus built cost around €30 and a few hours of workshop time to turn the outlet socket on the lathe. Do the math !
I've run thousands and thousands of nails through my 16 gauge angled Impulse gun with very few nail jams and every one of them was from hitting a nail plate of a drywall screw.if the paslode cells were refillable they would have done it by now.. the impulse guns have been on the marker for what 25 years now Riz?
as long as a paslode gun is maintained and cleaned every 3rd or 4th fuel cell it will work fine. eh riz!
Step 1 - Purchase bulk dry cleaning credits.As long as you are here---How do you refill ball point pen cartridges?