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Joined on May 25, 2011

Last Post on June 27, 2013

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Sizing a Commercial Water Make-Up Line

@ June 27, 2013 10:26 AM in Sizing a Commercial Water Make-Up Line

I am working on a commercial project with a 2 million BTU boiler and was wondering if there is a rule of thumb for sizing make-up water lines. 
I mostly work with residential and small commercial projects and they usually only requires a 1/2" line to bring in water. That number is just from memory mostly and to be honest I have no way to justify the line size. 
 s there a way to calulate this line size or a rule of thumb based on some requirement for the boiler?


@ June 27, 2013 10:15 AM in Help with finding an angle valve for Runtal radiators

This usually where I end up looking

Thank you

@ June 4, 2012 9:50 AM in Btu/FT from pex

This what I was looking for. A 20 degree delta T seems to the usual design for us.
Thank you


@ June 1, 2012 10:52 AM in Btu/FT from pex

I figured I would have to go through it all but was wondering if there was a 'safe' number for a standard 12" spacing 250' loop in a basement that would cover worst case scenario.

Btu/FT from pex

@ May 31, 2012 8:52 AM in Btu/FT from pex

I was wondering if there is a pex chart for btus/ft emitted, similar to those for baseboard.
I have been using a heatloss program that does not calculate the supply and return values of leaders from the loop in a room to a manifold.
I am hoping to find a number for btu/ft provide by 1/2" pex in concrete at 100 degree water.
If there is formula or a chart or direction in in how to figure it out the help would be greatly appreciated.

More Info

@ May 25, 2011 4:48 PM in Mixing Valve Location

It is a unusual application for sure. We are starting with boiler water in a closed system on one side of the exchanger and a low concentration of sulfuric acid mixed with water on the other. The whole system will not have any exposure to potable water.
I am used to putting the mixing most commonly on the transfer side of the heat exchanger not so much on the source of heat side.
Stainless steel pumps will have some resistance to the chemicals but I have no idea what is going to happen to the impeller. We looked at using immersion heaters but to get the heat needed they took up half the space of the tank.
This will be similar to a pool application except with low concentration sulfuric acid instead of chlorine.
I will try to get my drawing program running tonight and add a piping schematic to the post.
I am just curious if anyone has had issues installing mixing valves on a secondary line before the heat exchanger as opposed to installing it afterwards?

Mixing Valve Location

@ May 25, 2011 4:00 PM in Mixing Valve Location

I am working on a project for an anodizing plant and have specific water temperatures required in five separate tanks. Each tank will recieve the temperature needs from a line drawn off of a seconadry loop. Each Supply and Return for the tanks will have a heat exchanger installed to separate the system water and the liquid in the tanks. Supply tempertures will be controlled by a three-way mixing valve on each line.
I am leaning towards installing it on the boiler side of the exchanger to protect the valve (some of the tanks will have H2SO4 in them) and have the contractor account for the temp. drop across the heat exchanger. I have never set things up this way before and am wondering if there are any potential issues by having a pump pulling through the mixing valve and then pushing into a small heat exchanger (3x8-20 plates).
I will try to add a drawing tonight to explain thing a little better. It is a bit of a backyard operation that the contractor is aware that pumps will be wrecked continuously on the tank side.