Login    Register
User Information
Username:
Password:
We are a free and open
community, all are welcome.
Click here to Register
Sponsored
Who is online

In total there are 68 users online :: 5 registered, 0 hidden and 63 guests


Most users ever online was 218 on Wed Dec 07, 2016 6:58 pm

Registered users: Bing [Bot], Exabot [Bot], Google [Bot], MSNbot Media, Yahoo [Bot] based on users active over the past 5 minutes

The Team
Administrators
Global Moderators
global_moderators.png CS

I have a propane meter question

A place to ask general spud cannon related questions.
Sponsored 
  • Author
    Message

I have a propane meter question

Unread postAuthor: Cy4ka » Wed Jan 23, 2013 9:15 pm

I have a question about the propane meter pipe everyone is using for their combustion cannons. I am making my first advanced type cannon and would like to meter propane. I am already familiar with the process and the math but from what I've seen at that burtlatke sight, they calculate your meter pipe for you and I need to know if they use measurements from the actual nominal diamter of the meter pipe or if they are speaking in usual/general terms... because a 3/8" pipe is actually 1/2" inner diameter and a 1/2" pipe is actually about 5/8" diameter.

If I calucate using their tool and I use what they call a 3/8" pipe for my meter, I would actually be using a 1/2" for volume.

Do you all know what I'm saying?
  • 0


Cy4ka
Private
Private
 
Posts: 23
Joined: Wed Jan 23, 2013 7:07 pm
Reputation: 0

Unread postAuthor: mark.f » Wed Jan 23, 2013 9:23 pm

They use actual inner diameters for those calculations. So if you chose, say, 1/2" SCH-40, the calculator would be using 0.625" for inner diameter (or thereabouts).
  • 0

User avatar
mark.f
Donating Member
Donating Member
 
Posts: 3465
Joined: Sat May 06, 2006 11:18 am
Country: United States (us)
Reputation: 21

Unread postAuthor: Cy4ka » Wed Jan 23, 2013 11:26 pm

No not sch40 PVC I mean for the meter pipes. The gas pipe nipples and appropriate fittings. A 1/2" gas pipe or galvanized steel pipe is actually 5/8" about. Allot of people I've seen using 3/8" gas pipe nipples and fittings those have an actual nominal diameter of 1/2" though. So the calculator is either adjusting for that or they want you to use the actual inner diamters, I don't know.
  • 0


Cy4ka
Private
Private
 
Posts: 23
Joined: Wed Jan 23, 2013 7:07 pm
Reputation: 0

Unread postAuthor: jrrdw » Thu Jan 24, 2013 7:42 am

Cy4ka wrote:No not sch40 PVC I mean for the meter pipes.


You can build your meter from any type pipe. It should be pressure rated. All ways use inside diameter for sizing pipe. There are good 'how to's' here at Spudfiles on meter building that use PVC.
  • 0

When life gives you lemons...throw them back they suck!
User avatar
jrrdw
Donating Moderator
Donating Moderator
 
Posts: 6540
Joined: Wed Nov 16, 2005 5:11 pm
Location: Maryland
Country: United States (us)
Reputation: 25

Unread postAuthor: mark.f » Thu Jan 24, 2013 9:10 am

Cy4ka wrote:No not sch40 PVC I mean for the meter pipes. The gas pipe nipples and appropriate fittings. A 1/2" gas pipe or galvanized steel pipe is actually 5/8" about. Allot of people I've seen using 3/8" gas pipe nipples and fittings those have an actual nominal diameter of 1/2" though. So the calculator is either adjusting for that or they want you to use the actual inner diamters, I don't know.


Steel pipes are still measured by schedule. Galvanized or black nipples bought at most hardware stores are SCH-40. So 'gas' pipes have the same inner diameter of SCH-40 PVC pipes with the same nominal size.

(By the way, 'nominal' size refers to the marked size, 1/4", 3/8", 1/2", 3/4", etc. The actual inside and outer diameters aren't the nominal size.)

Take a look here for pipe sizes.
  • 0

User avatar
mark.f
Donating Member
Donating Member
 
Posts: 3465
Joined: Sat May 06, 2006 11:18 am
Country: United States (us)
Reputation: 21

Unread postAuthor: Cy4ka » Thu Jan 24, 2013 12:29 pm

Ok. So if I used 3/8 pipe I should use the calculator for 1/2" pipe.
  • 0


Cy4ka
Private
Private
 
Posts: 23
Joined: Wed Jan 23, 2013 7:07 pm
Reputation: 0

Unread postAuthor: mark.f » Thu Jan 24, 2013 12:33 pm

If you used 3/8" pipe, choose 3/8" pipe in the calculator (on burntlatke).

That simple. :)
  • 0

User avatar
mark.f
Donating Member
Donating Member
 
Posts: 3465
Joined: Sat May 06, 2006 11:18 am
Country: United States (us)
Reputation: 21

Sponsored

Sponsor
 


Unread postAuthor: Cy4ka » Thu Jan 24, 2013 8:56 pm

Lol, ok thanks. :P
  • 0


Cy4ka
Private
Private
 
Posts: 23
Joined: Wed Jan 23, 2013 7:07 pm
Reputation: 0

Return to General Spud Cannon Related

Who is online

Registered users: Bing [Bot], Exabot [Bot], Google [Bot], MSNbot Media, Yahoo [Bot]

Reputation System ©'