scott40

Is there any concern that the max psi of this connector is 300? And the CEJN max psi is 230?

skxf430

You mean the Parker has a higher load rating? No issues to my knowledge.

scott40

In the tech specs for each it shows the Parker max pressure is 300 psi and the CEJN at 230 psi. Those seem like low numbers if 400psi is needed to lift the car. But I don't know. Sounds like many of you are using both of these couplers without issue. When I look at couplers that don't have the blow off component, their max pressure is 1000psi. I am new to this so I am trying to learn.

poison123

Stupid question, are you using any seam tape etc for the threads on this? Or just bare metal to metal?

rebrewer

I used teflon tape.

Bob

kgorman

The yellow tape for gas

zip465

For the curious on the various tapes - from the Wikipedia... There are two US standards for determining the quality of any thread seal tape. MIL-T-27730A (an obsolete military specification still commonly used in industry in the US) requires a minimum thickness of 3.5 mils and a minimum PTFE purity of 99%.[3] The second standard, A-A-58092,[4] is a commercial grade which maintains the thickness requirement of MIL-T-27730A and adds a minimum density of 1.2 g/cm3.[4] Relevant standards may vary between industries; tape for gas fittings (to UK gas regulations) is required to be thicker than that for water. Although PTFE itself is suitable for use with high-pressure oxygen, the grade of tape must also be known to be free from grease.

Thread seal tape used in plumbing applications is most commonly white, but it is also available in various colors. It is often used to correspond to color coded pipelines (US, Canada, Australia and New Zealand: yellow for natural gas, green for oxygen, etc.). These color-codes for thread sealing tape were introduced by Bill Bentley of Unasco Pty Ltd in the 1970s. In the UK, tape is used from coloured reels, e.g. yellow reels for gas, green for oxygen.

• White: used on NPT threads up to 3/8 inch
• Yellow: used on NPT threads 1/2 inch to 2 inch, often labeled "gas tape"
• Pink: used on NPT threads 1/2 inch to 2 inch, safe for potable water
• Green: oil-free PTFE used on oxygen lines and some specific medical gasses
• Gray: contains nickel, anti-seizing, anti-galling and anti-corrosion, used for stainless pipes

The more you know....

GeoffSr@Isringhausen

I have this tank, valves system coming with a car I bought in Germany. Sold by Manthey I was told. Plan to sell independently of the car. I’ll have to research what it is worth. If anybody knows please inform me. Thanks.

[img]blob:https://rennlist.com/c205b37b-357e-4d79-a09c-2447f1fa04c5[/img]

Raider89

The above recommendations call for a Harris regulator. For me, my Radical car is only 1,500 lbs, so the 400psi version would be acceptable compared to specified 600psi version for a small discount. However, I really know nothing about these regulators, other than sticker shock on the Harris price. What about regulator from other sources such as Uniweld?
http://uniweld.com/product/rhp-special-purpose-series/

Consider the Harris is >$400, the Uniweld is $65 via Amazon.
https://smile.amazon.com/gp/product/...KIKX0DER&psc=1

What am I missing, is there a difference when only using with small I60 aluminum tank for air jack system? Thanks

rebrewer

Tank size is largely irrelevant. What you are looking for in the regulator is high flow rate which the Harris Motorsports regulator has.

Mike Roblin

Maybe it is a dumb question, but if speed of lifting isn't really a concern would the 1/4" outlet regulator be ok to use? Assuming yes, how much of a time difference are we talking about to lift a cup car?

rebrewer

I was hoping someone with an engineering background would chime in, but these jack are designed to be used at a specific pressure and flow rate. The use dry seals which may not like moving slowly. Just a guess. As expensive as these are to rebuild I would go with the high flow motorsports regulator. Also, they don't lift simultaneously, but sequentially, so low flow and slow lift would increase the time the first two jacks are at an angle rather than vertical, which can't be good.

Or I might be completely wrong.

Andy (Portland, OR)

Does anyone have the DemonSpeed nitrogen cart? https://demonspeed.com/product/nitrogen-bottle-cart/

If so, thoughts, feedback, review?

NightBlueTTS

I just picked one up. It’s a nice setup for a 7” diameter tank. Easy assembly and solidly built. Was a cinch to strap down in the trailer.

bgiere

Andy, the Demonspeed tank cart is super high quality and a "lifer" tool. Once you buy one you'll wonder how you lived without it. Convenient and safe.