Ballcock with pressure relief built in - Page 5 - Plumbing Zone

TheMaster · 02-07-2010, 01:30 PM

In redwoods link I just read the little independent relief valve is not asme certified. Thats why we cant use it,now why isn't it certified is the million dollar question. maybe its not reliable enough?

Protech · 02-07-2010, 02:39 PM

barnett stock # 521016 or 521015

Quote:

Originally Posted by Cal

I've seen several of them ,, and this is EXACTLY what happens !

Yet i'm having a lot of problems with expansion tanks ,, they are seeming to fail more regularly .

What about these relief valves you are talking about Pro T ??

Colgar · 02-07-2010, 02:51 PM

Quote:

Originally Posted by Ron The Plumber

My math is not that great, so sorry for asking this.

As water heats to expands, in a closed system how much is the pressure increased by each 1° of rise?

Copied from an old AO Smith book in my office:

Water expands at the rate of approx. .00023 % for each degree of temperature rise. If all the water in a 30-gal water heater were raised from 60 to 140 F, it would increase the original volume to 30.55 gallon.

Plumber Jim · 02-07-2010, 03:17 PM

Quote:

Originally Posted by Colgar

Copied from an old AO Smith book in my office:

Water expands at the rate of approx. .00023 % for each degree of temperature rise. If all the water in a 30-gal water heater were raised from 60 to 140 F, it would increase the original volume to 30.55 gallon.

With your numbers i get only .55 gallons not 30. I think you end up with 30.55 for a total increase of .55

Colgar · 02-07-2010, 03:22 PM

Quote:

Originally Posted by Plumber Jim

With your numbers i get only .55 gallons not 30. I think you end up with 30.55 for a total increase of .55

I think you're saying the same thing. Start with 30 gal., end with 30.55.

Plumber Jim · 02-07-2010, 03:34 PM

You're right. I need to wake up. hehe

**ILPlumber** · 02-07-2010, 03:59 PM

How much does stuffing that extra .55 gallon in there increase the pressure of the system? Assuming you are only dealing with the original volume. Not the whole house.

Redwood · 02-07-2010, 04:37 PM

Quote:

Originally Posted by ILPlumber

How much does stuffing that extra .55 gallon in there increase the pressure of the system? Assuming you are only dealing with the original volume. Not the whole house.

Not much!

But if you didn't have the tank given the non-compressibility of water enough to activate the T&P

Colgar · 02-07-2010, 05:12 PM

Quote:

Originally Posted by ILPlumber

How much does stuffing that extra .55 gallon in there increase the pressure of the system? Assuming you are only dealing with the original volume. Not the whole house.

From the same book:

Water confined in a storage tank or piping system will, when subjected to a temperature rise of 10 degrees, increases pressure from 50 lbs to 250 lbs.

That doesn't really answer your question and raises some of my own.

Where do "they" get the 50 lbs from?

Does that mean a 10 degree rise results in 5X more pressure or 200lbs more pressure?

caseysbuilding · 02-07-2010, 05:16 PM

Have you considered the F-5 falcon? It has really worked for me.

02-07-2010, 03:34 PM	#46
Plumber Jim Senior Member Join Date: Jun 2008 Location: Colorado Posts: 1,803 My Photos	You're right. I need to wake up. hehe __________________ Broomfield Plumber , Denver Plumber , Boulder Plumber , Lafayette Plumber

02-07-2010, 05:16 PM	#50
caseysbuilding Brian the plumber Join Date: Mar 2009 Location: Charleston, WV Posts: 50 My Photos	Have you considered the F-5 falcon? It has really worked for me. __________________ Check out my pictures athttp://www.caseysbuilding.com

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
New toilets with the built in overflow	Phat Cat	Plumbing Material and Products	48	11-29-2009 11:19 AM
No Pressure Relief On Tankless	JERRYMAC	Residential Plumbing	10	09-01-2009 07:50 AM
Fluidmaster Ballcock and Korky Ballcock	TheMaster	Plumbing Pictures	21	07-16-2009 07:28 PM
As Built Drawings?	highpoint	Commercial Plumbing	8	03-25-2009 01:12 PM
Gas relief	Bill	Off Topic	11	08-31-2008 10:13 PM

02-07-2010, 01:30 PM	#41
TheMaster Registered Member Join Date: Jun 2009 Posts: 6,437 My Photos	In redwoods link I just read the little independent relief valve is not asme certified. Thats why we cant use it,now why isn't it certified is the million dollar question. maybe its not reliable enough?

02-07-2010, 03:59 PM	#47
ILPlumber Moderator Join Date: Jun 2008 Location: IL Posts: 5,312 My Photos	How much does stuffing that extra .55 gallon in there increase the pressure of the system? Assuming you are only dealing with the original volume. Not the whole house.