DIY Mixing Whip

[omar]

I have 2 cole parmer gauges. One is identical to my PSI-Tronics.

The other is only used to check the fill in tanks (not good).

I have been thinking about getting a Precision Test Gauge http://www.3dinstruments.com/prtg.htm But I haven't gotten around to finding out how much they are.

I got rid of my cheap brass parker quick connects, That I got from McMaster-Carr they always seemed to leak.

I use the Parker SS 60 series I got at Compressed Air Specialties.
http://www.scubacompressor.com

They cost an arm and a leg $35-F & $18-M But they work even up to 4500 psi.

I also use a pressure regulator to control the output of the whip. The worst thing I did was use a scuba valve when I first put it together.

omar

 

[ericfine50]

UP,

Now that you mention it, I am not sure. I will double check.
Eric

 

[oxyhacker]

Last thing I knew, the ISO B Hydraulic couplings M-C carries were indeed Parker 60s (it’s an industry standard coupling, made by many companies), and the price was about $10 a fitting less than on the compressor link you gave. But I don’t like using the more convoluted ISO Bs with high FO2s - the nice thing about the STs is that they are straight through.

Was it the STs you didn’t like? The single O-ring seal on the STs may wear out a tad faster than more elaborate seals, but its so easy and cheap to change that who cares? Having said that, I should add that I haven’t had anymore leakage probs with them than anything else. The ease of changing the seal also makes it easy upgrade to EPDM or even viton for those partial to it. And brass does seem to start leaking faster than SS but the STs come in SS too.

C&H Sales ( surplus dealer in Pasedena CA, 1-800-325-9465) has some pretty good deals on high end analog gauges. They got a $165 5000 psi/6” mirror scale with “certificate of calibration traceable back to the Bureau of Standards” for $165, which is a lot of gauge for the money. The catalog doesn’t say what the accuracy is, but they told me the sticker on the gauge say it’s 0.1% FS which, if true, is damn good.

Originally posted by omar
I have been thinking about getting a Precision Test Gauge http://www.3dinstruments.com/prtg.htm But I haven't gotten around to finding out how much they are.

I got rid of my cheap brass parker quick connects, That I got from McMaster-Carr they always seemed to leak.

I use the Parker SS 60 series I got at Compressed Air Specialties.
http://www.scubacompressor.com
omar

 

[omar]

Yep,

I just checked in my junk parts box. They are the Brass ST. Straight out of the baggie from M-C they leaked. POS in my opinion.

I have received excellent service from Compressed Air Specialties so I called them up and ordered a couple. I have not had a single problem with the 60 series SS with the viton o-ring I got from them. In fact I ended up getting a bunch more.

Thanks for the tip about the gauge.

omar

 

[roakey]

Western Enterprises, the supplier of the fittings I use *finally* has an online catalog, something that I've been watching for:

http://www.westernenterprises.com/enterprises/indcontents.html

Roak

 

[roakey]

Update:

NESS has changed this part but not its number, the new part works just as well (It's a pushbutton bleed instead of a screw) and costs about half as much as the old part, so don't panic if you order one and it doesn't look like my picture.

http://www.northeastscubasupply.com/gas_stuff/fill_whip_ends.html

Roak

 

[Genesis]

on my O2 whip and like it a LOT.

 

[Mako Mark]

Does anyone have a diagram and specs for a nitrox blending whip, someone on the board is interested in how much it costs to set up a partial pressure blending station.

 

[boomx5]

Here is a link to a fill whip on Dave Dalton website...good luck. http://www.atlanticunderwater.com/equipment/fillwhip.shtml

 

[cornfed]

Someone told me that was O-Ring's website...