John Guest Dimensions

[palobrewer]

Hi,

I've been reading the forum and learned about the John Guest fittings. This got me really interested as I like the idea of quick and easy assembly. My idea is to have

Co2 Regulator MFL -> John Guest Adapter -> Gas Line -> John Guest Adapter -> MFL Ball Lock disconnect

MFL Ball Disconnect -> John Guest Adapter -> Liquid Line -> John Guest Adapter -> Picnic Tap (Somehow add a connection to change barb to MFL to attach to John Guest)

*Maybe it's a bit overkill to add a john guest adapter for the picnic tap?

Understandably the line that matters the most is the Liquid line and I would like to use a similar dimensions for the Gas Line. However, the PSI, at least for PVC tubing from McMasterCarr is only 50 which is lower than the 60 PSI that has been recommended (from reading the forums). I would only assume the Accuflex is of similar properties.

I'd like to keep this as many parts similar to each other, however, I am getting stuck on finding particular ID and OD's of Liquid and Gas lines.

I would prefer to order 4x John Guest 5/16" x 1/4" adapters instead 2x 5/16" for the Liquid and 2x 3/8" for the Gas Lines. My question is, is there a CO2 tubing that has an Outer dimension of 5/16" that fulfills the minimum requirement for PSI? Also, is their a preferable length?


Beer/Liquid Line

Recommended:
Interior Dimension: 3/16"
Outer Dimension: 5/16"

https://www.freshwatersystems.com/p-2574-john-guest-female-adapter-flare-516-x-14-flare.aspx

With

http://www.farmhousebrewingsupply.com/accuflex-bev-seal-ultra-3-16-50/

or

https://www.mcmaster.com/#standard-plastic-and-rubber-tubing/=18djjs1


CO2/Gas Line


https://www.freshwatersystems.com/p-2510-john-guest-female-adapter-flare-38-x-14-flare.aspx

with

https://www.mcmaster.com/#catalog/123/121/=18djjgw

Interior Dimension: 3/16"
Outer Dimension: 3/8"

 

[Smellyglove]

https://cdn.mystore4.no/cdn/299_500/maltmons2/80295_Tappeslange_med_picknickkran_1.jpg

PI4512F4S
PI061206S
then 3/16 PET hose
PI201206S
into 3/8 PET hose into the picnic tap

3/16 gives you more restriction in thee beer line so you don't have to run a long line to get the restriction you want out of the keg.

I'd advise against using PVC tubing INTO a John guest piece. The thing is that John guest has very narrow tolerances, even if you can get the hose into the John Guest, it's not sure it will be tight and seal. Like saying even if you can get your foot into some random shoe, it's not sure it will fit your foot. PVC hoses are made to tolerances concerning ID, not the OD, so the outer can be slightly off, not even perfectly round.

If you want to use hoses which you stick into a JG female, you need to use hoses which are classified as "tubes". Since they are made with OD as defined tolerances. Polyurethane hoses are often made to spec both OD and ID, but it must be a solid/hard hose. If you stick one of those PVC hoses into a JG female part, it's not up to code, and might leak.

You can use another JG part you stick into that Flare-part, and thread the hose on the outside if you want to use PVC.

The last pic is of my kegerator project. One PVC hose feeding a quadruple secondary regulator. That line has a 90 degree bend out of the picture, so I wanted the softer PVC for that, you can see I've used a part with a barb, and clamped the hose around that part.

The four blue lines are straight, since they are straight I went with polyurethane tubing so I could skip the barb.

Hope this helps.

 

[Smellyglove]

Could have just postet a proper pic the first time.. Here's the setup on the outside of the fridge.

So. PVC need barbs, "tubing" can go straight into a female JG.