Help! I did a ****oo - now how best to recover?

[1eyedjack]

Fairly simple problem, but being a newbie I haven't had this before:

I bought a plastic 40 gallon keg, and the berk who sold it to me put the rubber washer on the pressure release valve on the wrong side of the brass lip, so that the brass lip was flush with the entry hole to the keg instead of the rubber washer. Accordingly there was, obviously, no airtight seal and therefore no build-up of CO2 pressure in the barrel during priming. It is one of those kegs with a tap at the top and a float inside, so the pouring mechanism depends on the pressure gradient, not pure gravity fed.

So now I am sitting there with 40 gallons of primed ale and only just realised the problem. I have now fixed the seal, so my question is:
Should I

1) re-prime it with another 70g or so of sugar (or some lesser amount)?
2) Leave it be for a bit and it will pressurise itself again naturally?
3) Pressurise it with a blast from a CO2 cylinder?
4) Some combination of the above?
5) Other (specify).

Bottoms up, all, and happy new year.

 

[unclepumble]

Pressurise with CO2 cylinder

UP

 

[1eyedjack]

Great - thanks for that

 

[ChemPaul]

A mixture of 1, 2 and 3 really. If you have primed it recently then the gas pressure should start to build up over the next day or so although the amount of condition lost from the beer while the valve was faulty means that its probably best to assume it is flat now and needs repriming again. You could add a bit from the CO2 cylinder but IMHO you cant get that much condition into a beer using the S40 cylinders and it would be better to start again. You'll probably end up with a beer stronger that u origninally intended but ive never heard of that being a problem :

 

[evanvine]

You could add a bit from the CO2 cylinder but IMHO you cant get that much condition into a beer using the S40 cylinders

Damn it, S40, are they moving the goalposts yet again?