Joined on July 1, 2009
Last Post on April 17, 2014
@ April 17, 2014 8:00 AM in lowering steam pressure in a industrial building...That the boiler feed water pump pressure must be 3% higher than the highest pressure releif valve setpoint plus any pressure drop between pump and boiler. So, in my case, our relief valves pop at 150psi so: 150psi* 1.03 + 5psi= feed water pressure of 159.5psi.
This prevents problems of returning to higher pressures and not being able to fill the boiler.
@ April 16, 2014 8:06 PM in lowering steam pressure in a industrial buildingWe used to operate at 130 psi but only out of ignorance. New building, engineers " told us to operate at 130 psi". I talked management into 90psi and that is were we run. we have around 30 AHU's, a two HEX HHW system and single HEX DHW system. The max normal steam pressure for these coils/HEX's is 15psi. I imagine when there is a power loss, of for any reason, all the control valves go wide open because of demand, there will be a slow return to normal at 12 psi. As for the feed water, Our dearator pumps have a return pipe with orifices' to the tank between the pump and supply line to boilers. I took out the Orifice and installed globe valves to regulate pressure to boilers. Was 225 psi; Is 155-160psi. Can drop to ten if I wanted to but Per an ASME code, the feed pump must be a percentage (3 or5) higher than the Boilers pressure relief valves. So, you are limited on pressure reduction, unless you replace your presure relief valves to a lower value
My feeling is , that vertical pipe with water is a deadleg. Water in any deadleg becomes stagnant sitting there waiting for me to open a valve. Over time, microbes can grow and at night when the water in all the pipes is static, those microbes can float out of the dead leg and into my next glass of water. I am sometimes a victim of my own imagination, but I sleep well at night.
@ April 16, 2014 11:28 AM in Intermittent issue with PressuretrolI would try adjusting the main scale all the way up, down and back to where it was to see if you can drive out any slop in the pressuretrol. Then, just because it is easy to do, I would make sure the pig tail it is mounted on is clean all the way thru. A clogged pig tail usually let's the boiler operate at higher than desired pressures but before I spent money, I would check it anyway. It's free. If that is no help, I would just replace the pressuretrol.
@ April 15, 2014 7:31 PM in vaporstatsounds like either a failed vstat or they are wired in parallel, instead of in series.
@ March 29, 2014 6:03 PM in Do you ever get sick of lookingthe shear number of incompetents outnumber the competents. This is the crux of your problems ( opportunitities in my book).
As far as homeowners who come across as cheap, I offer this, the gospel according to The Lending Tree:
If the latest financial crisis thought me anything its most people are pretentious and foolish.
I present the millions who lost homes, cars, lifestyles, wives or husbands because of a glitch in the economy. You cant reach them! You are competing against idiots for idiots who are prospects..
Disclosure: I am a homeowner who wishes to help those who have gladly helped me.
@ March 26, 2014 7:24 PM in Removing and loosening painted radiator condensate trap coversof the likelihood of lead paint.
@ March 26, 2014 6:41 PM in Do you ever get sick of lookingthey probably paid a fortune for a poorly installed system, paid a fortune in fuel and were never comfortable. Then, a competent installer shows up and tells them they need to spend another fortune to make it right.
I feel for them. In most cases, they are low or fixed incomes. sometimes, they can afford it but cant justify it. once bitten twice shy
@ March 18, 2014 5:46 PM in gas fired steam crown boileror too much fresh water from an auto water feeder? just curious. I would hire someone to do it. Simply for warranty issues and speed since it is still heating season.
@ March 14, 2014 11:37 AM in Sight glass "empties" when boiler is firingTake a look at your boilers instalation manual. You should be able to find online if you dont have it.
@ March 13, 2014 8:08 PM in Boiler efficiency cycling vs continuous runto the O.P.
signup online for plumbing and mechanical magizine and read this article.
Boiler Jacket Loss
The International Energy Conservation Code addresses the controversial subject.
By Ray Wohlfarth
March 15, 2013
@ March 9, 2014 8:33 PM in question on dry returnsI never felt or detected a problem. I didnt even realize my end of mains were connected above the water line (but it was below the waterline of the original boiler).
So I fixed it. the difference is now both loops heat faster (5 min &10 min)- Twice as fast.
The vents dont huff & puff any more, they are silent. the water in sight guage went from a one inch bounce to a quarter inch bounce, and the pressure went from 9 oz to well, I dont know. the rads heated up at zero oz and I shut her down. it is 70 degrees outside after all!
thanks for all the help over the years. I believe I treaded my last pipe on this system!
@ March 6, 2014 9:59 PM in Need Help - New Gas Boiler for Steam System ProblemsLooks like your sight glass and safeties are against a wall too. This creates the potential of out of sight , out of mind with devices that should be always on your mind. This may also. be a code violation.
When you take new photos stand way back so we can see the whole arrangement. Include one with the gas line too.
@ March 5, 2014 12:17 PM in question on dry returnsAnd sorry about the confusion in original post. This is not the first time I did this.
The dry returns are vented.
I meant to say the end of mains and, if successful, attached a sketch of what I have. One loop is approx 30% shorter than the other loop. Hence, the half of the house served by the longer loop takes longer to vent. What I was doing, after reading the many posts on venting, was timing how long it takes the steam to reach the end of mains without the vents installed.
Naturally, the short loop vented first so I replaced that vent. Then waited for the other loop, but what I saw happening was the steam crossed over to the other main because it is above the waterline. I reinstalled that vent and it too closed. So, that means air is trapped in the larger loop. So, I was seeking confirmation that the conection should be below the NWL before I repiped it.
@ March 4, 2014 10:05 PM in question on dry returnsSorry! it is a two pipe system. what I want to ask is, should the two end of mains join above or below the waterline?
What I am seeing is the short loop vents fast and closes its vent..
Then,because the two end of mains join above the water line, steam crosses over to the longer loop,heats that vent until it closes and air is trapped in the longer main.
I believe they should connect below the water line so they stay isolated. Am I right?
@ March 4, 2014 8:34 PM in question on dry returnsmy header splits into two loops along the outer perimeter of house, circle back to boiler and connect above the waterline, then drop below the waterline with a single pipe. their vents, vent until they get hot. The condensate has its own return. I think by connecting above the water line, the shorter loop vents first, then it's steam pushes into the other loops return. forcing that loops vent to close and trapping air between two heads of steam.
@ March 4, 2014 7:46 PM in question on dry returnsI have a two pipe system with two mains and two dry returns. My question is. the dry returns come together near the boiler, should they connect above the water line, or below?
@ February 25, 2014 8:44 AM in another case for pesonal protectionThis first one might fall under Gross Negligence by contractor who incorrectly converted a pool heater from Propane to natural gas:
This second link would fall under gross incompetence by inspectors who "performed CPR" on first couple but didn't suspect appliances in pool equipment room and the Medical Examiner who dragged his feet reporting cause of death of first couple to be CO poisoning which would have prevented the third death.
So, when I read the Rocky Mount incident above, I wasnt surprised. NC promotes itself as a "business friendly state".
@ February 24, 2014 11:01 AM in another case for pesonal protectionin the same motel room in Boone NC for anyone to investigate.
@ February 16, 2014 8:45 PM in Kickstart THIS!I dont know how I missed that thread.
@ February 15, 2014 8:12 PM in Kickstart THIS!Knowledge, of course! that's why we come here.
actually, I believe steam has plateued because the market is shrinking. A 90%+ efficient boiler maybe?
@ February 11, 2014 8:02 PM in Meet The CozyI think you are ready for your appearance on Shark Tank!