Go Back   iRV2 Forums > MOTORHOME FORUMS > MH-General Discussions & Problems
Click Here to Login
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 04-16-2014, 11:38 PM   #1
Senior Member
Cola ny's Avatar
Join Date: Mar 2014
Posts: 190

The specs on my class C say the propane tank is 51 pounds what does that equal in gallons?

Cola ny 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 04-17-2014, 01:01 AM   #2
Senior Member
focker's Avatar
Damon Owners Club
Workhorse Chassis Owner
Join Date: Sep 2012
Location: Sacramento, CA
Posts: 1,273
Pretty sure that would be about 11 to 12 gallons.

Some of the most asinine things people do are typically preceded by the two words "Watch this".
Scott and Jess |What are the Fockers up to?
focker is offline   Reply With Quote
Old 04-17-2014, 01:06 AM   #3
Senior Member
palehorse89's Avatar

Newmar Owners Club
Join Date: Oct 2009
Posts: 8,105

Originally Posted by Cola ny View Post
The specs on my class C say the propane tank is 51 pounds what does that equal in gallons?
4.2 lb/gal. @ 60 deg.
So.......51/4.2= 12.14 gallons
2000 Newmar MADP 4060, 350ISC, Spartan MM, IFS 2011 Jeep JK, M&G Braking, 2014 MTI 27' Hog Hauler, Wireless brake control, 2006Ultra & 1989 Springer
palehorse89 is offline   Reply With Quote
Old 04-17-2014, 07:44 PM   #4
Moderator Emeritus
Gary RVRoamer's Avatar

Join Date: Jan 2000
Location: Silver Springs, FL. USA
Posts: 18,635
Could be tricky if they didn't say just what weight they are quoting. If the use the weight stamped onto the tank itself, a number called WC, that is based on water weight, not propane, so the correct division is 51/8.3 and thus 6.15 gallons.

WC is the weight of the water needed to fill the tank 100%. But then you have to remember that a propane tank is only filled 80% and that propane weighs a lot less per gallon than water. A short cut formula is that the tank can hold propane equal to 42% of the WC value. A standard "20 lb" portable LP tank used on BBQ grills has a WC value of about 48.

But if they are quoting the actual weight of the propane in the tank, the numbers the others calculated for you are correct.
Gary Brinck
Former owner of 2004 American Tradition
Home is in the Ocala Nat'l Forest near Ocala, FL
Summers in Black Mountain, NC
Gary RVRoamer is offline   Reply With Quote
Old 05-23-2014, 07:51 AM   #5
Senior Member
gasman405's Avatar
Join Date: Mar 2014
Location: Mullica Hill, New Jersey
Posts: 139
51 divided by 4.24 the weight of a gallon of propane.
gasman405 is offline   Reply With Quote
Old 05-23-2014, 05:41 PM   #6
Senior Member
bailiff's Avatar
Join Date: May 2013
Posts: 381

I do believe, a gallon of propane and a gallon of water take the same room in the tank. Last time I checked, a cubic foot of air and a cubic foot of water were still the same. But your 51 should be WC in pounds. Thus 80% should be just over 9 gallons usable.

bailiff 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
Hydronic heat: Propane vs Diesel in winter temps? TinMan Trvlr RV Systems & Appliances 10 03-31-2014 02:32 PM
20 lb "exchange" propane tanks mel s MH-General Discussions & Problems 32 03-31-2014 07:50 AM
Propane Gas Smell jlabit Class A Motorhome Discussions 23 02-11-2014 07:59 AM
Can not get propane to MH from Tank guaranteed Class A Motorhome Discussions 28 01-18-2014 09:11 AM
My Dometic 3Way Fridge On Propane Libero RV Systems & Appliances 3 10-04-2013 04:40 PM

» Featured Campgrounds

Reviews provided by

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 08:03 AM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.