In researching materials to construct a fuel tank for an off road motorcycle I've been made aware that standard PP and PE have too high a surface resistance and therefore store static electricity. Very special grades are available (tho not in small volume) with resistances of half or less than...
Not possible to "make" fuel resistant rubber easily?
In that case can anyone tell me where to obtain sheet, or block/bar stock of fuel resistant rubbers?
Thanks.
Im trying to make a part of which common pourable RTV silicone is ideal as it needs to be cast. Only problem is it must be reasonably fuel (gasoline) resistant which all RTV's I've tried are not.
It's doesn't need to be silicone. Any rubber about 30 Shore hardness will do.
Thanks.
Is there a tig torch with variable amps adjustment 'on the fly'? I'd be interested in your thoughts if you have used them. I'd like something small and compact for sub 70amps work, mostly steel and stainless. I dont care for pedals at all.
unclesyd,
Sorry my description was a bit confusing. Imagine a normal gas fired furnace, now inside I put a sealed, say tungsten vessel. Inside the vessel is a vacuum (28.5" Hg) and a crucible charged with steel. Flames heat the vessel from outside and in turn heat the crucible inside.
What...
I am constructing a small oxy/acetylene fired vacuum furnace for 1Kg steel melts. I need a cylinder around the crucible which will be the wall of the vacuum chamber. The cylinder will be a diameter of about 3" by 4" tall and must be good for about 2000C/3600F. I can tune the burner so it is a...
This has been helpful. After a little experimenting I can confirm that the difference in temp in insignificant (for my purpose). I thought it would have been more.
Thanks folks.
Hello,
Im trying to work out what the temperature increase of a vessel full of water at 90 degrees C (194F) at atmospheric pressure after it is compressed to 10bar(145PSI) ?
Can anyone point me to a simple chart or formula to show this relationship?
Thanks.
Well I must confess, the relays are not controlling a motor at all the're controlling two 7amp 240volt heating elements for a small boiler. I wanted to ask in this forum cos I thought the knowlege base here was the most appropriate for my issue so I made it a motor! I know some folks get funny...
Gentlemen, THANK YOU!
I would never had found it and have been waiting for omega tech support for a week now. Thanks for putting me out of my misery. Page numbers and extra application info too.... Over and above.
Hello,
I am using a PID (Omega Cni16D22) to control a 30amp solid state relay for a motor. I've not used SSR's before and assumed they were the same as mechanical relays with respect to connections.
The output of the PID is also a SSR (internal) so I wired it such that the output would 'switch'...
Ok,my particular application aside, as I simply would like to know anyway... Can anyone give any info on the process of applying a coating of PTFE to whatever surface?
From what I have learned so far it doesn't sound too far out of reach ie, chemicals,careful surface prep,fumes,high heat.
In this case it's to coat an aluminium hot drinking water pump impeller so the purpose of the teflon is for the hygiene factor. It must be good for 100 degrees celsius too. Doesn't have to be teflon but is must be food safe.
I cant seem to find much info regarding home-brew teflon coating which I figure means it probably wont be easy at least. This would be a damn handy this if it could be done. Can anyone shed any light on the process/equipment required? I have high vacuum if that helps...
Gallium attacks aluminum. I will have to look into the concept of "oxygen getters". I guess iron should work too?
The container is acetal and sealed with epoxy. The idea of the liquid is so I can work with the metals before placing in the container without them oxidizing. How long do you think...
No Im not selling elements, though I have bought off him and he uses argon as a shield. I require a liquid as a shield.
The metals are copper, tin, iron, nickle, gallium. The trouble element is gallium. A liquid abouve 29 degrees C it forms an instant skin of oxide when exposed to everything...
trashcanman,
Yes, it is a licenced fire protection service company doing the work.
TenPenny,
Thanks, I did search for a simple online calculator before posting with no luck. Unfortunately I dont have the required excel applet so your's dosnt work for me. Do you have another? I'd like to play...
Thanks for the input. I will give some of those a try. Mineral based oils have failed so far. Anyone know much about polyphenyl ether other than that it's expensive and hard to get. It sounds ideal.
