All of your nitrogen should be removed from your system at end of day. There shouldn’t be a mixture of solvent and nitrogen vapors for long periods of time. It’s used to push the solvent, not store with the solvent. Granted, if your tank or vessel is being kept cold, you shouldn’t have too many issues, for a short period of time. But, I wouldn’t leave nitrogen in the system for extended periods.
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@Dred_pirate , my cls is 1 or 2 lb capacity, i can bleed off every vessel as needed, all have gauges and purge valves, i do not leave system unattended, once I’ve got my extracted solvent in my collection, my sleeved column , collection and tank all on dry ice/iso,
How long should i wait to bleed off n2?
Immediately? Or let the system settle 5 minutes?,
Is Cooold and fast diff from dewax run? I want to purge asap , once the push is done
Definitely before starting recovery
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Damn was this me? That photo isn’t mine. But I’m one of the guys who was stupid and did this.
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gotta have those prv’s set in a useable range for the vessel.
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What’s a good range buddy? 100-150?
I have 3 and feel i need to check them w my next pressure test
Ones adjustable at like 120 the other 2 aren’t adjustable they set at 150
I now operate that way
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The prv on my 25lb tank from oss is 125 psi, I believe
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I may had gauge fail last night due to nitro and CRC
The rubber stopper on my glycerin filled gauge shit out w force. Scared the shit out me. Leaked my VG out the gauge. I’m sure was from to much nitro or something
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what is the max psi on your vessel? does it have pressure raitings for different temps? What solvent blend are you useing?
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I use whip premium lately which is tri blended i believe
I thought the vessel rating was 300psi but @Killa12345 would have to verify. I imagine the gasket blow out first but I’m not sure.
if it is raited to 300 psi put a 175psi releif valve. 175psi is higher than your solvent tank should ever get with that blend, and lower thann the failure pressure of the vessel. Get a Valve that has a hard seat, the soft seat ones tend to leak at low temps.
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@Soxhlet does Stainless Steel Low Pressure Proportional Relief Valve, 1/4 in. MNPT x 1/4 in. FNPT | Proportional Relief Valves, R3, R4, RL3, and RL4 Series | Relief Valves | Valves | All Products | Swagelok qualify as a hard seat PRV?
Edit: Could someone clarify the difference between a hard seat PRV and a soft seat PRV?
https://www.opensourcesteel.com/products/inline-pressure-relief-valve?_pos=1&_sid=64343bd5f&_ss=r
For adjustable this is the cheapest, they usually have in stock. Also has a place to Hardline it Incase it burps u can burp outside ur area
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Oss goes to 150
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I wasn’t absolutely certain. I knew I was in the ball park. Thank you for the correction
Our system is a oss and they come standard with a 150 psi the inline ones are way better then the basic cheapo ones so you can hard line the burp out ofbthe work area for safety reasons, but honestly a little over kill.
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Hard seat mans that the valve seat is made of metal, in this case you’d want ss. The valve will perform better/ longer/ lower temp if the seat is made from stainless.
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based on the fact that it has a fkm seat no, check out the lubricant in that one… woulden’t want that in my system. Look for a special cleaned and packaged lubricant free option from swagelock with a hard seat.
What psi range are you looking for?
depending on your budget you could get one of these and clean the hell out of it with hydrocarbons, everyones favorite ketone, and an alconox bath followed by a deionised h20 rinse.
https://www.grainger.com/product/15X849?gclid=CjwKCAiA__HvBRACEiwAbViuUyXmtLEOu2JvVJQl4ovEe1W8sw7YBKxHWWt0_aBGuFsTCpIbvO6lSBoC2h0QAvD_BwE&cm_mmc=PPC:+Google+PLA&ef_id=CjwKCAiA__HvBRACEiwAbViuUyXmtLEOu2JvVJQl4ovEe1W8sw7YBKxHWWt0_aBGuFsTCpIbvO6lSBoC2h0QAvD_BwE:G:s&s_kwcid=AL!2966!3!281698275819!!!g!472324140703!
Make sure the one you get is in a useable pressure range for your system.
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Im shtting down my system. Some how the pressure gaige on my solvent tank completely froze ive been burping off pressure as the dry ice melts. When would the n2 be likely to cause most pressure?
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Is the solvent vessel on ice?
You listen for the audible difference between nitrogen bleeding and the solvent boiling.
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