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bob

bob

Joined on January 12, 2005

Last Post on April 16, 2014

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Heat-x

@ April 16, 2014 1:13 AM in The dreaded Entran

I can't see what good a heat exchanger will do with cast iron radiators . It will stop the boiler from seeing the oxygen but not the radiators .

vents

@ April 11, 2014 5:17 PM in Radiator air vent preference?

John , google "Jerry Gill Plumbing" click on videos and then heating . Jerry has lots of first rate info on his site .

Ice

@ March 29, 2014 11:12 AM in Pipe Freezing

Mike , FWIW I have done this a few times . I fabricated a cardboard box around the pipe and filled it with dry ice pellets , worked great . Once I notched a 5gal bucket to fit the pipe .
I wasn't working in such tight quarters. I was working for a large mechanical contractor at the time so if it went south the worst that could happen to me is get run off.

Vents

@ March 25, 2014 11:52 PM in Senior Trainer

Google Jerry Gill plumbing .

Injuries

@ March 21, 2014 11:56 PM in Pipefitters shoulder

I'm a retired fitter, just received my 50 year pin from the UA . I hate to tell you this but they won't let you retire until you're 80% scar tissue .

Rattle

@ March 2, 2014 12:59 AM in Rattling coming from baseboard heating system

It looks like your tank is screwed into the bottom port of a flow control valve . Open the valve with the manual opener and see if the rattle stops .

CO

@ February 25, 2014 11:35 PM in How many of you carry

Which is heavier CO or air ?

Ell

@ February 19, 2014 8:30 PM in friction loss

B&G lists 5 equivalent feet for a 2" screwed 90º ell .

Air

@ February 5, 2014 4:38 PM in Flue gas due point question

Nick and Carl , I stand corrected . Good information Nick . I worked in the mountains during the 80's on the west slope . When I moved there from Chi . I couldn't get a straight answer from anyone about altitude and btu's even the service men for RMNG . I finally got hooked up with the chief engineer for RMNG and he gave me the formulas and the base pressures for the towns on the west slope. He never mentioned WOBBE numbers . I don't think Rocky Mountain Natural Gas was that sophisticated at that time .

Air

@ February 5, 2014 2:23 PM in Flue gas due point question

Nick, the utility company does not add air to control but content . The reduction is due only to altitude .

Gravity

@ January 30, 2014 6:33 PM in All we are saying, is give grav-i-ty a chance!

Kudos, you can't beat gravity. Nice pipe work Timco .

Hydraulic separator

@ January 26, 2014 6:40 PM in does this system look right?

Steve, that doesn't look like a hydraulic separator I think it's a Rol-air-trol or Taco's equivalent .

Left over electricity

@ January 19, 2014 3:10 PM in Something Interesting to noodle over.

When ever I unplug an extension cord I always plug the two ends together as fast as I can to save the left over electricity in the cord . What I have found is the next time I use the cord
I pull it apart , plug the male end in and instantaneously there is electricity at the female end.
I never have to wait for the cord to fill up. Waste not want not .

Security check

@ December 17, 2013 11:27 PM in Math quiz at end of first post after login...

Do the math, click on the box labeled Security Check Answer and insert the answer then click on anywhere outside the box and only then click on Submit Post. Works first time every time.

Thermal conductivity

@ December 13, 2013 2:19 AM in What does

is a lower case k, K stands for Kelvin . What context was it being used Tim ?

Pulled tees

@ December 6, 2013 11:57 PM in Frog Tape and IR Thermometers

Your manifolds look great, first class work . I've never heard of pulling tees with a John Deere. Do you anneal the tubing first? I used to build them by cutting a hole with a hole-saw and just silver brazing a stub in. I have some that have been working over thirty years no problems. I have built some using a T-drill and I would agree it's a better job .
I read that you have an interest in mechanical things , maybe you can help me answer a long standing question. When you look at old machinery with a wheel on it like a fly wheel or bandsaw wheels or well wheels made of cast iron sometimes the spokes are straight and sometimes S curved. In fact they still cast well wheels both ways. WHY would they use the extra material and labor to make an S curve?

Position of motor

@ November 21, 2013 5:46 PM in Help! Unusual system design problem

Rob I think you might have misinterpreted the instructions .

∆ T

@ November 19, 2013 12:16 AM in Taco Bumble Bee on Mod/Con boiler ?

I would be a little leery using ∆ T on a monoflo system . Monoflo works on pressure drop. I think you should try it and let us know how it works .

Leak-finder

@ November 5, 2013 9:07 AM in Fiber Optics

I used to use a company called Gammy Nuclear Services . They would put a radioactive isotope in the system and find the leak with a Geiger counter . I never got to watch them they would just put an x on the floor . I think federal regulations may have put them out of business .

Current draw

@ October 27, 2013 12:48 AM in Caleffi Troubleshooting

Using HR"s calculator and the resistance that Alan measured the Z-valve would draw one amp and 25 watts when because of inductive reactance it really draws .3 amp and 5watts.

Ohm's law

@ October 27, 2013 12:40 AM in Caleffi Troubleshooting

Ohm's law applies if the load is a pure resistance like a water heater element or electric furnace element. If the load involves a coil like the winding in a motor or a solenoid as soon as the current flows you have inductive reactance. The impedance will vary as the rotor spins or as the armature enters the solenoid etc. I don't know how to calculate impedance .

Resistance

@ October 26, 2013 5:22 PM in Caleffi Troubleshooting

HR I don't think your formula will work. Your formula only works with DC. With AC
inductive reactance jumps in. You can measure the resistance with an ohm meter and use your formula to determine current draw but when you install the motor in a AC circuit it
will draw far less current than your formula predicts. The inductive reactance caused by
AC current in the winding will cause the apparent resistance ( impedance ) to be much higher than what your ohm meter measured . A zone valve motor is wound so that even
when stalled the impedance is so high that the motor can't draw enough current to hurt it's self.
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