Quarter can be fine.
What’s your real concern is overall pressure drop across the system.
Dynamic pressure is important. Install a pressure gauge close to your plasma cutter inlet. And when your cutter fires observe the amount of pressure drop from static pressure to dynamic pressure. 5 PSI drop is about the limit.
I have a different question concerning the PRIMEWELD CUT 60. I have the newest model bought new in January 2025. CNC port top right. what is your recommendation about frying the VIM or damaging my THC. everything i see says that the model I have will be fine on divided but i don’t trust it 100% because Langmuir no longer supports those machines.
i have a regulator built into my cut 60 and another regulator 50’ or so up the line. its dropping maybe 10 points at the first regulator from 100 psi to 90. then my working pressure stays at around 75 for extended periods of time. I’m still figuring it out but I’m looking into adding a dry tank to give me longer run time and less stress on my compressor. currently using a 32 GAL portable compressor with a Dessicant filter and then a motor guard 60. my next step is a after cooler. DO you have any thoughts or any input as to how to make my system better? I appreciate the help
I would be tempted to just hook the unit up raw voltage. The way the Langmuir systems works we end up with a lot of dividing voltage from 50 to 1 to 73 to 1. at least if we use raw voltage we only have one set of dividing resistors.
When setting up an air system in the winter time it’s easy to mistake the advantage of the dehumidified winter air as your system running great. Basically this time of the year everyone has a refrigerated air dryer in a cold winter shop. I actually have problems with ice forming with inside my system because of how cold my shop is. Each layer of an air drying system takes care of its own range of dehumidification. My favorite arrangement is to use the air compressor tank as the first heat exchanger as it was intended. Then I have a regulator immediately after the tank so I can run the pipe work system at a different pressure than what I keep the tank. Static pressure will rise dramatically as we increase our PSI. The next stage would be some kind of passive or active ambient air cooler. After this stage and before the refrigerated air dryer you will want a coalescing filter. Then the refrigerated air drying setup which I do not use in the winter time. Then after the refrigerating air drying setup this is a good place to add your secondary storage tank. Now depending on the pressure drop and the distances between this tank and your other tank you might want to have a another pressure switch or adjust your pressure switch at the main tank to kick on earlier. Absolutely make sure on any parts of the system that can be completely closed off that there is a pressure relief valve. This is likely your secondary tank. Make sure you have a relief to valve on it. Now from this reserve tank run it through your desiccant than a motor guard than a regulator with a gauge. Finally you can connect this to your plasma.
It seems like a lot but in your worse conditions which is the humid middle of summer each one of these devices will perform well in their own range of dehumidification giving you an overall good outcome.
Thanks so far so good I’m hooked up RAW voltage. Disappointed the fed ex guy didn’t have my table today but maybe tomorrow. it still says its coming today at 10:55pm… I highly doubt it… I didn’t really enjoy taking apart a brand-new plasma cutter, but it was obviously necessary for my situation. Trying to get some preliminary stuff knocked out with all my upgrade kits that I’ve received while waiting for my table. However, I don’t want to stray far from the guide and do something I’m going to have to take apart later. (Any suggestions on anything that’s worth getting a jump on is appreciated.)
As far as my drying unit, I live in south Florida where it’s very humid. I’m thinking of purchasing an aftercooler but don’t know enough about it yet. also thought about making my own like other guys on here. seems like a $90 dollar aftercooler may be the way to go.
unit set up as follows:
I have a regulator at my tank into 10’ 0f 3/8 comp hose to a 2-stage filter directly after my water filter and Dessicant filters I have a second regulator then I have a 5’ run to my reel with a disposable in line filter. Then a 50’ run of 3/8 comp hose to a MOTORGUARD M-60 with a 3’ run of 3/8 comp hose to the back of my plasma unit. I’m going to do some tests tonight or tomorrow and see what kind of pressure I’m losing. I know if I hit the blow gun the regulator at my 2 stage drops 10/15 psi. I’ve invested a lot of time and money into this and I’m banking on it working so I really appreciate all the help. So, anything you find wrong with my system or anything you recommend is very welcomed, I’m new to this level of compressor system.
There’s a document in this post which has a decent walkthrough of the raw voltage wiring.