Gas Dryer Supply Line Sizing - Appliances - DIY Chatroom Home Improvement Forum
Advertisement


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Appliances


CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Display Modes
Old 01-29-2017, 11:09 PM   #1
Member
 
Join Date: Jun 2014
Posts: 84
Rewards Points: 111
Default

Gas dryer supply line sizing


I bought a gas dryer, Samsung DV5200. It's 22,000 BTU/hr, and the gas connection is 3/8 MIP. The installation manual recommends using a 1/2" supply line and a reducer. My question is why not use 3/8? I have a 3/8" flare valve on the wall, so I could buy a 3/8" supply line with a 3/8 flare to 3/8 FIP adapter. Is there some benefit to a 1/2" line? I don't mind spending a few extra dollars if there's a good reason to.

Also, it says to add a 1/8" test port immediately upstream of the dryer. Is this really necessary? If I ever wanted to test pressure, I could just disconnect the dryer supply hose and test it that way, right?
Attached Thumbnails
Gas dryer supply line sizing-screen-shot-2017-01-29-21.06.42.jpg  

Advertisement

ebalsley is offline   Reply With Quote
Old 02-08-2017, 12:43 PM   #2
Newbie
 
Join Date: Jan 2017
Posts: 9
Rewards Points: 18
Thumbs up

Re: Gas dryer supply line sizing


Quote:
Originally Posted by ebalsley View Post
I bought a gas dryer, Samsung DV5200. It's 22,000 BTU/hr, and the gas connection is 3/8 MIP. The installation manual recommends using a 1/2" supply line and a reducer. My question is why not use 3/8? I have a 3/8" flare valve on the wall, so I could buy a 3/8" supply line with a 3/8 flare to 3/8 FIP adapter. Is there some benefit to a 1/2" line? I don't mind spending a few extra dollars if there's a good reason to.

Also, it says to add a 1/8" test port immediately upstream of the dryer. Is this really necessary? If I ever wanted to test pressure, I could just disconnect the dryer supply hose and test it that way, right?
Thank you!

Advertisement

ColeMaude is offline   Reply With Quote
Old 02-08-2017, 03:25 PM   #3
Member
 
Join Date: Jan 2017
Posts: 66
Rewards Points: 132
Default

Re: Gas dryer supply line sizing


Quote:
Originally Posted by ebalsley View Post
I bought a gas dryer, Samsung DV5200. It's 22,000 BTU/hr, and the gas connection is 3/8 MIP. The installation manual recommends using a 1/2" supply line and a reducer. My question is why not use 3/8? I have a 3/8" flare valve on the wall, so I could buy a 3/8" supply line with a 3/8 flare to 3/8 FIP adapter. Is there some benefit to a 1/2" line? I don't mind spending a few extra dollars if there's a good reason to.

Also, it says to add a 1/8" test port immediately upstream of the dryer. Is this really necessary? If I ever wanted to test pressure, I could just disconnect the dryer supply hose and test it that way, right?
I don't see the reason to increase to 1/2 just for the connector hose and reduce back to 3/8 a couple foot later. If you were to use 20 ft of 3/8 piping I would see a problem.

The test port might be necessary to adjust the burner manifold pressure. If that is something that is actually adjustable. I have a gas drier but never bothered looking to see if the manifold pressure is adjustable. Anyhow, if it is adjustable - and if it doesn't have a port on the valve itself - you'll need a port installed in the piping so you can monitor the pressure with them burners on.
GASCo is offline   Reply With Quote
 
Old 02-08-2017, 03:55 PM   #4
Breakin' Stuff
 
Join Date: Mar 2016
Location: Cleveland, OH
Posts: 297
Rewards Points: 586
Default

Re: Gas dryer supply line sizing


Supply line sizing is based on flow and line length. Your supply line may already be 1/2", with a reducer to a 3/8" valve. Did you have a gas dryer before?

In any case, unless you replace the piping back to the main, 3/8" isn't going to make a different in the few feet from the wall to your dryer. 22,000 BTU isn't a lot of gas.
__________________
The wife and I are DIYing the renovation of our house! See what we've done at http://www.schlosserhouse.com
Bret86844 is online now   Reply With Quote
Old 02-17-2017, 12:58 AM   #5
Member
 
Join Date: May 2015
Location: Canada
Posts: 3,828
Rewards Points: 46
Default

Re: Gas dryer supply line sizing


3/8 piping isn't legal here. It can only be used to connect an appliance via an adapter. (ontario)

Without knowing the working pressure, you can't be sure that 3/8 is enough. (at 7"wc and less then 0.5"wc drop, 3/8 is good for less then 31ft.)

Cheers!
supers05 is offline   Reply With Quote
Old 02-17-2017, 01:03 AM   #6
Member
 
Join Date: May 2015
Location: Canada
Posts: 3,828
Rewards Points: 46
Default

Re: Gas dryer supply line sizing


Quote:
Originally Posted by GASCo View Post
...
The test port might be necessary to adjust the burner manifold pressure. If that is something that is actually adjustable. ...
You don't measure upstream of a regulator to measure it's output. In this case; upsteam of the gas valve trying to measure the manifold pressure doesn't work.

The test port is for a working pressure measurement not for static pressure. (WP= pressure while every appliance is running. SP= the same as disconnecting the gas line to measure without the port.)

Cheers!
supers05 is offline   Reply With Quote
Old 02-17-2017, 08:52 AM   #7
Member
 
Join Date: Jan 2017
Posts: 66
Rewards Points: 132
Default

Re: Gas dryer supply line sizing


Quote:
Originally Posted by supers05 View Post
You don't measure upstream of a regulator to measure it's output. In this case; upsteam of the gas valve trying to measure the manifold pressure doesn't work.

The test port is for a working pressure measurement not for static pressure. (WP= pressure while every appliance is running. SP= the same as disconnecting the gas line to measure without the port.)

Cheers!
Makes sense!! Shame on me!!

I was comparing to the valves that have two ports, one before and one after. But you are right, the before one is not necessary...

Advertisement

GASCo is offline   Reply With Quote
Reply


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 Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Main Toilet Supply Line Clogged? Redskins-21 Plumbing 10 01-27-2014 05:27 AM
Gas dryer - installing flexible gas line mspmatt Plumbing 11 12-30-2011 04:32 PM
Putting extension on dryer gas line mwpiper Appliances 3 12-07-2011 12:07 AM
Cold Refrigerant Line...Warm Supply camryman95 HVAC 7 06-30-2011 05:29 PM
Main Supply Line Vibrates When Cold Water Runs kmcbee1971 Plumbing 1 01-13-2009 09:26 PM




Top of Page | View New Posts

 

Search Engine Friendly URLs by vBSEO 3.6.1