Go Back   Winnipesaukee Forum > Winnipesaukee Forums > Home, Cottage or Land Maintenance
Home Forums Gallery Blogs YouTube Channel Classifieds Links Calendar Register FAQDonate Members List Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Display Modes
Old 07-09-2017, 07:02 PM   #1
NoBozo
Senior Member
 
Join Date: Jun 2008
Location: Portsmouth. RI
Posts: 2,231
Thanks: 400
Thanked 460 Times in 308 Posts
Default 20 # Bottle

I have been using my BBQ for decades..currently a Weber Spirit. When the bottle is near empty..it weighs in at 18 pounds..maybe slightly less. When the bottle is getting low I weigh it on my digital bathroom scale. Don't want to get caught empty in the middle of a meal.

All's well. The other day I went to my Propane supplier for the last 30+ years . While charging the bottle..The guy doing the recharge put a screwdriver to a little "blead screw" on the side of the bottle valve. Never noticed this procedure before. I asked him about it and didn't get much of an answer.

When I got home I weighed the "Full" bottle. (Never done that before) It weighed 35.2 pounds. My impression was it should weigh 38+ pounds. 18 pounds for the empty bottle + 20 pounds for the propane.

Is this Normal..? NB
NoBozo is offline   Reply With Quote
Old 07-10-2017, 09:34 AM   #2
Hillcountry
Senior Member
 
Join Date: Apr 2016
Location: In the hills
Posts: 2,288
Thanks: 1,523
Thanked 752 Times in 448 Posts
Default

I believe it's general practice to fill propane tanks (large and small) to about 80% capacity. Not sure if this is for safety or that it's a law but my twin 250 gallon tanks are never filled more than 75-80%.
As for the 20 lb. grill tanks, I always have a full one on hand as a backup in case I run out while grilling...never cared about how much propane was inside...
Hillcountry is offline   Reply With Quote
Old 07-10-2017, 09:38 AM   #3
joey2665
Senior Member
 
joey2665's Avatar
 
Join Date: Sep 2008
Location: Meredith Bay & LI, NY
Posts: 3,070
Thanks: 1,031
Thanked 951 Times in 613 Posts
Default Expansion and Contraction

Quote:
Originally Posted by Hillcountry View Post
I believe it's general practice to fill propane tanks (large and small) to about 80% capacity. Not sure if this is for safety or that it's a law but my twin 250 gallon tanks are never filled more than 75-80%.
As for the 20 lb. grill tanks, I always have a full one on hand as a backup in case I run out while grilling...never cared about how much propane was inside...
You are correct the 75-80% allows for the expansion and contraction of the propane with changing temperatures.
joey2665 is offline   Reply With Quote
Old 07-10-2017, 11:57 AM   #4
DickR
Senior Member
 
Join Date: Apr 2008
Location: Moultonborough
Posts: 632
Thanks: 4
Thanked 204 Times in 129 Posts
Default

When you think about it, you don't want the liquid level too close to the outlet. You want vapor going out the pipe to the grill, not a slug of liquid, which would provide a sudden surge of fuel to the grill, maybe blowing flame all over your face!
DickR is offline   Reply With Quote
Old 07-10-2017, 01:35 PM   #5
TheProfessor
Senior Member
 
Join Date: Nov 2010
Posts: 770
Thanks: 16
Thanked 226 Times in 138 Posts
Default

Understand the point of the post is about weights and mathematics.

The place I go to uses both a scale and a unit counter. Gallons I think.

The screw I think is to let excess air out. But let other chime in on that.

Me, I have an extra full tank. So don't have to worry if grille tank runs out while cooking.
TheProfessor is offline   Reply With Quote
Sponsored Links
Old 07-10-2017, 06:27 PM   #6
RUGMAN
Senior Member
 
Join Date: Jul 2015
Location: weirs beach,
Posts: 245
Thanks: 37
Thanked 31 Times in 25 Posts
Default

seems like when we swap one out at cumberland (blue rhino), there is even less propane in them than when I get the tanks filled back home.
RUGMAN is online now   Reply With Quote
Old 07-10-2017, 07:05 PM   #7
thinkxingu
Senior Member
 
thinkxingu's Avatar
 
Join Date: Jul 2014
Posts: 4,660
Thanks: 1,084
Thanked 1,505 Times in 903 Posts
Default

Quote:
Originally Posted by RUGMAN View Post
seems like when we swap one out at cumberland (blue rhino), there is even less propane in them than when I get the tanks filled back home.
Yup, Blue Rhino only fills it 75% or so to be "extra safe."

Sent from my XT1528 using Tapatalk
thinkxingu is offline   Reply With Quote
Old 07-10-2017, 07:07 PM   #8
NoBozo
Senior Member
 
Join Date: Jun 2008
Location: Portsmouth. RI
Posts: 2,231
Thanks: 400
Thanked 460 Times in 308 Posts
Default

Quote:
Originally Posted by TheProfessor View Post

The screw I think is to let excess air out. But let other chime in on that.

Me, I have an extra full tank. So don't have to worry if grille tank runs out while cooking.
I think you are correct about bleeding off AIR at the top of the bottle. We always keep a spare bottle. I guess using my bathroom scale to weigh the bottle is a bit Anal...that's me.. NB

PS: NEVER lay the bottle on it's side..Always keep it VERTICAL while transporting the bottle in your car.
NoBozo is offline   Reply With Quote
Old 07-10-2017, 07:39 PM   #9
SteveO123
Senior Member
 
Join Date: Jul 2010
Location: Laconia, Lake Opechee
Posts: 143
Thanks: 283
Thanked 68 Times in 38 Posts
Default

Last time i got Blue Rhino they advertised it as 15#. I thought I was getting ripped off but maybe it was just truth in advertising! And it was actually on the 4th of July last year, 2/3 of the way into the cookout! Be prepared! I learned my lesson and keep the spare "full" or at least 3/4!
SteveO123 is offline   Reply With Quote
Old 07-11-2017, 10:47 AM   #10
SIKSUKR
Senior Member
 
SIKSUKR's Avatar
 
Join Date: Apr 2004
Posts: 5,075
Thanks: 215
Thanked 902 Times in 509 Posts
Default Tanks are limited to 42% of liquid weight

Here is a real thorough explanation. Cant confirm if its correct but it seems reasonable.
http://modernsurvivalblog.com/preps/...ank-really-is/
__________________
SIKSUKR
SIKSUKR is offline   Reply With Quote
Old 07-11-2017, 11:42 AM   #11
DickR
Senior Member
 
Join Date: Apr 2008
Location: Moultonborough
Posts: 632
Thanks: 4
Thanked 204 Times in 129 Posts
Default

Let's examine the numbers on that URL Siksukr cited. The WC (water capacity) of the tank shown is 47.6 lb of water, specific gravity 1.0 at room temperature. At 77 F, propane's density is 0.493 (https://en.wikipedia.org/wiki/Propane). Full of propane, the contents would weigh 47.6 * 0.493/1.0 = 23.47 lb. The 42% of WC regulation would allow for 20.0 lb, which is 85% of propane capacity. The numbers all agree.
DickR is offline   Reply With Quote
Old 07-11-2017, 03:22 PM   #12
upthesaukee
Senior Member
 
upthesaukee's Avatar
 
Join Date: Jan 2003
Location: Alton Bay
Posts: 5,268
Blog Entries: 2
Thanks: 2,027
Thanked 1,743 Times in 966 Posts
Default

Quote:
Originally Posted by SteveO123 View Post
Last time i got Blue Rhino they advertised it as 15#. I thought I was getting ripped off but maybe it was just truth in advertising! And it was actually on the 4th of July last year, 2/3 of the way into the cookout! Be prepared! I learned my lesson and keep the spare "full" or at least 3/4!
I had a friend who had Blue Rhino tank exchange at his store. When I said that could come in handy if I ran out when the refill stations were closed (he was opened until 9pm). He told me how Blue Rhino was only filled with 15 lbs, and if I ever did run out, grab a tank at his house because BR was a ripoff. What seems like a good idea on the isn't.
Dave

Sent from my SM-T580 using Winnipesaukee Forum mobile app
__________________
I Live Here... I am always UPTHESAUKEE !!!!
upthesaukee is online now   Reply With Quote
Old 07-12-2017, 10:07 AM   #13
bilproject
Senior Member
 
bilproject's Avatar
 
Join Date: Oct 2007
Location: Bear Island/Fort Myers, Fla
Posts: 223
Blog Entries: 1
Thanks: 1
Thanked 58 Times in 40 Posts
Default

The screw the filler opened is an outage gauge. It is connected to a tube in the valve that goes down to the 85% level. Gas will come out at first and when liquid reaches the end of the tube a white fog will appear out of the small hole to the outside of the valve telling the filler that the tank is full. However, all 20# tanks that are legal to fill today have an auto stop fill feature that will stop the filling at 85% or less. Sort of an idiot proof system to prevent overfills which could cause the relief valve to open if the tank became liquid full and the pressure inside reached 250 psi. There is never air in a propane tank except when new. a new tank must be purged of air before filling. If air and gas were mixed it could explode although unlikely as propane's range of flammability is about 1.9 to 2.4%.
bilproject is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
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 On

Forum Jump


All times are GMT -4. The time now is 08:33 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.

This page was generated in 0.15904 seconds