Go Back   iRV2 Forums > MOTORHOME FORUMS > MH-General Discussions & Problems
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
  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 01-14-2016, 07:03 PM   #29
Senior Member
Join Date: Jul 2014
Posts: 5,481
I use 2, 20 lb tanks on my boat. When they fill them, they open the bleed and pump until it spits or stops filling.

When it spits liquid it usually stops pumping before They reach the valve.

I can't recall anyone using a scale anytime in 5 years cruising the East coast.

twinboat 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 01-14-2016, 07:48 PM   #30
Senior Member
BrianGlenn's Avatar

Country Coach Owners Club
Join Date: Apr 2015
Location: Alberta
Posts: 506
Originally Posted by Murf2u View Post
So you're saying they don't weigh cylinders with OPD's to determine when they're full anymore?
I have found in Canada propane tanks are still weighed for "fullness". I have found in the US tanks are filled with volume, and the vent is opened until "propane" starts to release. The cost is based on liquid propane metered into the tank until the vent releases propane.

The icing on the external piping around the regulator in the OPs post is due to propane expanding as the pressure is reduced - it is an endothermic expansion of a gas, known as the Joule-Thompson expansion. Not Physics - but the laws of Thermodynamics.

As mentioned, it "sucks in" heat from surrounding materials/tubing. The metal gets cold and condenses the moisture in the high humidity air on the outside of the tubing/regulator creating the ice. When it is higher outside ambient temperatures, the air temperature is usually hot enough to compensate the outside metal temperature helping to prevent the formation of ice.

Turbo expanders in commercial gas plants use this principle to condense natural gas liquids (NGLs) - high pressure compression followed by a large pressure drop - the resultant cold mixture condenses butanes, propanes and sometimes ethanes. I have designed many of these facilities.


EDIT: Interesting story - I worked in Norman Wells, North West Territories in my earlier career, where the ambient temperature was -55C one day (-67F). I had a plant operator drain the lube oil from a propane chiller and he actually had liquid propane (at atmospheric pressure) in a bucket (the chiller was outside). He then brought the bucket into the maintenance shop and it started to "boil" as the temperature of the metal bucket started to raise about the -44C temperature and bubble point (boiling point) of liquid propane at atmospheric pressure. True story (but not relevant to the OP posting LOL).

Towr: 2007 Country Coach Allure 470 - 37 Sunset Bay Cummins 400 ISL
Toad: 2007 Jeep Grand Cherokee (yes, it has a Hemi)
BrianGlenn is offline   Reply With Quote


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
Propane vs Electric heat Vancouver Island kitcross750 Canada Region 17 12-18-2015 04:46 PM
Dometic Ice Maker Water Line Update wil01 RV Systems & Appliances 15 12-03-2014 04:07 AM
Propane Alarm Won't Stop Chickadee Newmar Owner's Forum 8 08-20-2014 05:44 AM
Kohler propane generator won't start Fosters Class A Motorhome Discussions 4 06-27-2014 08:23 PM
Air line pneumatic burst (leaking air line) GypsyTurtle Country Coach Owners Forum 4 05-29-2014 10:32 PM

» Virginia Campgrounds

Reviews provided by

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 02:32 AM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.