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Brews & Views Bulletin Board Service * Brews and Views Archive 2004 * Archive through December 31, 2004 * Herms coil < Previous Next >

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Steven Edward Haun
Member
Username: Stevehaun

Post Number: 145
Registered: 02-2003
Posted on Wednesday, December 29, 2004 - 11:37 pm:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

I have been searching the archives regarding the ideal size of copper tubing to use for a herms coil. 1/2" seems to be what most people use. However, I am confused. Is this 1/2" ID (5/8" OD) tubing or is it 1/2" OD tubing (3/8" ID)?
 

Dave Witt
Advanced Member
Username: Davew

Post Number: 619
Registered: 03-2003
Posted on Thursday, December 30, 2004 - 12:51 am:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

Steve,

The actual size is 1/2" OD and fittings (flare, compression, etc)are 1/2" when talking soft copper tubing. For copper sweat fittings you need 3/8" to fit over 1/2" soft copper. Hope this makes sense.
 

Kent Fletcher
Advanced Member
Username: Fletch

Post Number: 690
Registered: 11-2002
Posted on Thursday, December 30, 2004 - 01:30 am:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

I use 1/2" OD, which is actually larger than 3/8" ID, Grainger 3P672 is about $38 for 50 feet, but you probably don't need 50 feet, quite a few HERMSers use 25 foot coils. 3/8 OD is too small, the increased head losses mean low flow rates.

For sake of clarity, always refer to the OD size when discussing copper tubing.
 

Joe Rovito
Member
Username: Joez8

Post Number: 131
Registered: 03-2003
Posted on Thursday, December 30, 2004 - 07:13 am:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

Keep researching ! It is not intuitive.
In fact it is downright confusing till you get the hang of it.

Pipe & Tube have different fittings:

Compression & Flare for tubing
Sweat and NPT (thread) for Pipe.
===================================
1/2" soft copper tubing, as used for herms coils is actually 1/2" O.D.

1/2" copper pipe is 5/8" O.D. - Go Figure !
I.D. varies between 0.527 --> 0.569" dependent on type.

My Herms uses 50' of "1/2" tubing. I connect to my "1/2" pipe fittings with a 1/2" compression to 1/2" NPT adapters.

Some Links:
http://www.keidel.com/mech/pvf/pipe-cu.htm
http://www.gizmology.net/pipe.htm
http://www.plumbingsupply.com

(Message edited by joez8 on December 30, 2004)
 

Steven Edward Haun
Member
Username: Stevehaun

Post Number: 147
Registered: 02-2003
Posted on Thursday, December 30, 2004 - 01:51 pm:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

My entire system (hoses, full-port ball valves, quick disconnects, couplings, pipe, etc) is 1/2". If I use 1/2" OD copper tubing for my herms coil, won't that have significantly higher resistance than the rest of my system? Is that a problem or do you have to decrease your flow so much to prevent compacting your grain bed that the increased resistance of the herms coil is insignificant?
 

Bill Pierce
Moderator
Username: Billpierce

Post Number: 1626
Registered: 01-2002
Posted on Thursday, December 30, 2004 - 03:28 pm:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

Don't sweat it, Steven. The relatively small difference in diameter between 1/2 in. I.D. pipe and hose, and 1/2 in. O.D. copper tubing for the recirculation coil is not going to cause problems.
 

Kent Fletcher
Advanced Member
Username: Fletch

Post Number: 693
Registered: 11-2002
Posted on Thursday, December 30, 2004 - 06:47 pm:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

Steven, you already have several points of restriction tighter than the .436 ID of 1/2" OD tubing. Your QDs have a smaller ID, any barbed fitting does. Besides, going larger than 1/2" OD tubing is actually less efficient in a coil of reasonable length, because of the ratio of volume (per foot of tubing) to contact surface area.
 

Belly Buster Bob
Senior Member
Username: Canman

Post Number: 1953
Registered: 02-2003
Posted on Thursday, December 30, 2004 - 10:57 pm:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

just to toos a curve...I use 3/8 tubing. Pipe can also be used for a coil...fill it with sand and bend away