RV Trip Planning Discussions

Go Back   iRV2 Forums > iRV2.com COMMUNITY FORUMS > Just Conversation
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 05-22-2020, 05:16 PM   #1
Senior Member
 
C5c5's Avatar
 
Join Date: Sep 2019
Location: Minne-so-cold
Posts: 538
Vacuum Units Technical Question

I'm looking for an affordable vacuum pump that can evacuate to 1 micron.

Looking at pumps for sale, I am very confused with all the vacuum unit jargon and how they relate to 1 micron.

Many vacuum pumps advertisements are explained in Pa, Hg, or CFM without stating any info about microns.

Can anyone knowledgeable give me a dumbed down version of how all these vacuum measurement units relate and how I can tell if they can evacuate to 1 micron?
__________________

C5c5 is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 05-22-2020, 05:49 PM   #2
Senior Member
 
Skip426's Avatar


 
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 19,214
Following ; because I've never heard of the rating of a vacuum pump giving in microns.

Always thought that microns were a dimension , and related to filtering capacity .
eg. final fuel filter good to 3 microns , where a primary/water separator, would be 20 micron.

Question . What paperwork or web site , got you looking for a vacuum pump with the micron rating ?
__________________

__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
Skip426 is offline   Reply With Quote
Old 05-22-2020, 05:59 PM   #3
Senior Member
 
Join Date: Jul 2014
Posts: 21,889
Don't understand it and don't want to, but here it is.

Micron*is a unit of measurement starting from a perfect*vacuum*(no pressure) that is expressed in linear increments. One inch= 25,4000*microns*thus one*micron= 1/25,400 of an inch. When discussing*vacuum*in terms of*microns, this refers to total ABSOLUTE pressure as opposed to GAUGE pressure.Feb 8, 2012
twinboat is online now   Reply With Quote
Old 05-22-2020, 06:09 PM   #4
Senior Member
 
Skip426's Avatar


 
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 19,214
Quote:
Originally Posted by twinboat View Post
Don't understand it and don't want to, but here it is.

Micron*is a unit of measurement starting from a perfect*vacuum*(no pressure) that is expressed in linear increments. One inch= 25,4000*microns*thus one*micron= 1/25,400 of an inch. When discussing*vacuum*in terms of*microns, this refers to total ABSOLUTE pressure as opposed to GAUGE pressure.Feb 8, 2012

OK , now that's clear as mud ,
Thank goodness it's happy hour; in my time zone anyway; ... cause I do believe I need a drink .
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
Skip426 is offline   Reply With Quote
Old 05-22-2020, 06:26 PM   #5
Senior Member
 
jacwjames's Avatar
 
Monaco Owners Club
Join Date: Jun 2014
Posts: 6,584
Thankfully I already had drink in hand when I read that.
__________________
Jim J
2002 Monaco Windsor 38 PKD
2005 Jeep Grand Cherokee w/5.7 Hemi
jacwjames is offline   Reply With Quote
Old 05-22-2020, 06:41 PM   #6
Junior Member
 
Join Date: Nov 2019
Posts: 21
What are you doing that you need to go that low in vacuum? I know of a few good pumps that will go down to 15 micron but that's really low.

are you sure its not 100 micron?

100 micron is expressed as 0.1 mmgh. that would be a vacuum of 29.92 in hg as read on a normal vacuum gauge
cafeguy is offline   Reply With Quote
Old 05-22-2020, 06:47 PM   #7
Senior Member
 
C5c5's Avatar
 
Join Date: Sep 2019
Location: Minne-so-cold
Posts: 538
Quote:
Originally Posted by cafeguy View Post
What are you doing that you need to go that low in vacuum? I know of a few good pumps that will go down to 15 micron but that's really low.

are you sure its not 100 micron?

100 micron is expressed as 0.1 mmgh. that would be a vacuum of 29.92 in hg as read on a normal vacuum gauge
My project requires to evacuate gasses from a bag to attain thermal resistance. Others who have done it stated evacuating down to 1 micron.
C5c5 is offline   Reply With Quote
Old 05-22-2020, 06:55 PM   #8
Senior Member
 
Skip426's Avatar


 
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 19,214
OK , I'll take my second drink and abandon this thread , because I'm sorry but; now I just don't want to know.
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
Skip426 is offline   Reply With Quote
Old 05-22-2020, 08:38 PM   #9
Senior Member
 
C5c5's Avatar
 
Join Date: Sep 2019
Location: Minne-so-cold
Posts: 538
Quote:
Originally Posted by Skip426 View Post
OK , I'll take my second drink and abandon this thread , because I'm sorry but; now I just don't want to know.
Not to worry, nothing bad or illegal! I am doing a project for a video and do not want to let exact info out.
C5c5 is offline   Reply With Quote
Old 05-22-2020, 08:45 PM   #10
Senior Member
 
Join Date: May 2019
Posts: 1,009
I don't know if Boeing Surplus is still a thing, but if it is, you'll find it there. Maybe sold by the pound.
__________________
Time flies like an arrow. Fruit flies like a banana.
________________________________________
TARDIS Project 2001 Mountain Aire DP40' 330CAT
rodekyll is offline   Reply With Quote
Old 05-22-2020, 09:37 PM   #11
Senior Member
 
Join Date: Jun 2018
Location: Los Angeles area
Posts: 554
^^^ What Skip and Twinboat said... a micron is -usually- a unit of length... it's shorthand for micrometer which is one millionth of a meter or 0.001 millimeter or about 0.000039 inch. When it's is used in measuring a vacuum it starts at a absolutely perfect zero vacuum and measures absolute pressure... you'll need to do a google search for more as that's the limit of my off-the-cuff knowledge on microns...

Pascal (Pa) is a measurement of pressure - one Pa is roughly 0.000145 psi, or going backwards, 1 PSI is about 6,900 Pa. You will see Pascals quantified as KiloPascals or KPa 99% of the time. 220 KPa is about 32 psi.

Hg is the atomic symbol for Mercury, the liquid metal that we played with as a kid and nowadays is treated as a hazardous substance (which it is).

Inches of Mercury is also a measurement of pressure, and 1 inch of mercury is roughly 1/2 PSI. Barometers are usually calibrated in inches of Hg... when the TV weatherblonde says "the barometer is at 29.92 and falling" she's referring to 29.92 inches of mercury (and usually hasn't a clue as to what's she's reading off the TelePrompter).

Inches of water is a less common measure of pressure, and is usually seen where small differences in pressure need to be measured... 1 inch of water is roughly 0.04 psi. The cleanroom I used to work in had a positive pressure gauge in the wall calibrated in inches of water... that pressure kept the dust going outwards (away from the door) when the door was opened.

CFM is Cubic Feet Per Minute and is the amount of air your pump can push how fast... it's the gaseous equivalent of gallons per minute.

Mike
(who last worked with vacuum pumps - fascinating pieces of equipment - back in the 1970s at NASA-JPL where physics makes the world go 'round...)
__________________
Semi-retired technogeek...electronics / computer network / 2-way / ham radio... WA6ILQ
1985 Fleetwood 32' Southwind (Chev P30/454/TH400), dubbed "Lazarus" by friends... I resurrected it from the dead...
AnotherMike is offline   Reply With Quote
Old 05-22-2020, 10:27 PM   #12
Senior Member
 
Join Date: Nov 2015
Posts: 12,183
What kind of money are you willing to spend?
JB Industry makes the 'Eliminator' and the 'Platinum' Models
25 micron and 15 micron

$420 & $480


Not aware of ANY vacuum pumps that can achieve 1 micron


10 microns == 29.9196" Hg/gauge == 0.000384" Hg/absolute
__________________
Is it time for YOUR Medication or Mine?
Dodge 3500 w/Tractor Motor & NUWA 5vr
US NAVY---USS Decatur DDG-31
Old-Biscuit is online now   Reply With Quote
Old 05-23-2020, 09:05 AM   #13
Senior Member
 
C5c5's Avatar
 
Join Date: Sep 2019
Location: Minne-so-cold
Posts: 538
When an absolute vacuum of 29.92Hg is referred to, in relation to evacuating a space, does this mean all gasses & moisture are gone from the space?
C5c5 is offline   Reply With Quote
Old 05-23-2020, 11:18 AM   #14
Senior Member
 
Glenn and Kathy's Avatar
 
National RV Owners Club
Workhorse Chassis Owner
Join Date: May 2000
Location: California Central Coast
Posts: 1,649
This thread has created a perfect vacuum in the space between my ears, thanks a lot.

Glenn
__________________

__________________
2006 Sea Breeze LX 8341 on a Workhorse W22 Chassis with 22.5 Alcoa Alum wheels,
2011 Chevy Colorado 4X4 with Ready Brake
Glenn and Kathy is offline   Reply With Quote
Reply



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Travel Trailer AC Units vs Motor Home AC Units ??? Moxxi Class A Motorhome Discussions 5 05-05-2018 05:59 AM
Newmar wants $1,120 upgrade 2, 13.5 heat pump units to 15.0 units Gamaliel Kid Newmar Owner's Forum 15 12-19-2016 07:27 PM
Technical Electrical Question ??? tjshively Alpine Coach Owner's Forum 7 10-31-2011 06:45 PM
Highly technical question. 2002 Ultimate Advantage Leshka Winnebago Industries Owner's Forum 0 04-19-2010 09:53 PM
RO Water System Technical Question Lukeaa RV Systems & Appliances 3 11-29-2008 06:26 PM

» Featured Campgrounds

Reviews provided by


All times are GMT -6. The time now is 03:06 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
×