Joined on November 24, 2007
Last Post on March 11, 2014
@ March 11, 2014 8:29 PM in Converting one pipe steam to hot water!?Do a search here for mustashian , and you will see a prime example of misinformation on the subject of heating. The internet is a wonderful source of information but like any drug must be used with caution.
The client may have seen the efficiency ratings of mod-con boilers in the range of 90+%, but it is the system efficiency which matters. Get her to come here, and she will soon see the benefits of repairing the system she already has.--NBC
@ March 11, 2014 1:03 PM in Not enough heat with new boiler set at low pressure.Those valves should be fully open, so that the condensate can drain out underneath the steam.
I think you will find when you get the main vents up to capacity, you will see how the system operated when it was new!--NBC
@ March 11, 2014 6:05 AM in Question about two pipe systemAllowing a faulty trap to remain on a system will throw off the balance of the system, and could cause the destruction of other traps in the system. Do you hear any water-hammer?
Get your plumber to fix things rather than using a shortcut to correct only the symptoms rather than the underlying cause.--NBC
@ March 11, 2014 6:01 AM in Not enough heat with new boiler set at low pressure.You didn't mention the condition of the main vents, which do all the venting work for the system, as opposed to the radiator vents which are sized for the radiators. If the mains are inadequate, then you have been paying for a lot of extra fuel to force the air out of constipated little vents, under high pressure (30%?).
Post some pictures of the main vents, and we can advise some replacements. Keep the pressure low, and make the system work as it did when new.--NBC
@ March 10, 2014 11:06 PM in Converting one pipe steam to hot water!?Is there some reason for your question?
Is the present system not functioning properly?
Any sort of conversion from steam to hot water will require new oiler, pipes, and radiators, to make sure there are no leaks, and that there is enough radiation capacity to heat with cooler water, instead of steam. Let's fix your system as it is.--NBC
@ March 10, 2014 11:01 PM in Room heat loss calcsIf this is a building more then 50 years old, which has not been changed,, and has the original radiators, then you can be pretty sure that the radiators were properly sized for the rooms.
If you have had balance problems, then that would be the likely cause of some rooms being overheated.
Take some pictures of the boiler, and your main vents, and we can probably see what the next course of action for you should be.--NBC
@ March 10, 2014 8:04 AM in Room heat loss calcsAre you just checking the existing radiators for correct sizing? Use the SlantFin heat loss app for the BTU requirements for each room.
To size the replacement boiler, the combined total radiation EDR of the building radiators must be tallied-not the heat loss. The EDR is expressed in square feet of steam, and then a boiler whose square feet EDR matches most closely is the right choice. When you use this method, the piping factor is already factored in. Simply replacing the boiler with another one of the same size may not give good results.
You may wish to install 2 smaller boilers each of 1/2 the total needed.--NBC
@ March 9, 2014 11:11 AM in Midco LNB-250 modulating burner firing picsThis burner is the future of steam efficiency for the modern age, especially with Mark's control.!--NBC
@ March 9, 2014 11:08 AM in Hoffman system detailsI've been studying all the Hoffman literature from the library here, and cannot see the orientation of the check valves isolating the air eliminator circuit from the returns and supply. Any advice on their direction, and why they are that way?--NBC
@ March 8, 2014 11:50 PM in Radiator to baseboardAs their thermal mass qualities are quite different, it is not a good idea to mix the two types of radiation in the same house. This would be more of a problem on an unbalanced system such as yours. In a balanced system, all the radiators will receive steam at the same time and for the same duration, which does not seem to be the case with yours.
Most likely, you need to increase the main venting, and slow down the radiator venting, to balance things out. Excessive pressure can also slow the steam down in the supplies. Post some pictures of your main vent, and radiator vents, and we will go from there.--NBC
@ March 8, 2014 10:03 PM in Probe Type Level SwitchesThese switches have been used for a slightly different purpose by Gerry Gill, and Steve Pajek for their steam mini tube system as a pressure control. They may have some experiences to relate.--NBC
@ March 8, 2014 9:56 PM in Stage-fired boiler controls?I'm so glad to hear your report of good operation, even though you have to flip switches to get some heat.
Now that the boilers and burners are operational, with 2 different burn rates, I wonder how important the Taco boiler switcher is. It would be better to log the results further to see which one should be the lead boiler, and which the lag.
As I see the control strategy, when firing from cold with a two-stage thermostat, the thermostat will energize both boilers. As they fire, and the steam fills the system, the vaporstat will cut off the lag boiler at the setting you choose-from 2 ounces to 6, (if the pressure should rise that high). As the inside temperature has risen by this time, the 2-stage thermostat will probably reduce firing to 1-stage(boiler), and the lead boiler will carry the load.
During most of the winter, the temperatures are average, instead of very cold like the design temperature. Maybe these average winter temperatures can be handled by the smaller 200k boiler, and if so, that would be the lead, which will continue firing when the lag has been cut off by the 2nd stage of the thermostat, or the vaporstat.
In a vacuum system, at moderate cold temperatures, the vaporstat will rarely see the 2-6ounces of maximum pressure, so it will be up to the thermostat to do most of the controlling of the 2 boilers, while operating so much of the time at sub atmospheric pressures. Some experimental time will be needed to determine the correct setting of the CPH on the thermostat.
I'll probably be doing the same thing with my chapel Dunham project this summer, and so any observations you may have will be useful.
Keep up the good work--you are a great credit to all of us non-professionals on this site!!--NBC
@ March 6, 2014 10:57 PM in Need Help - New Gas Boiler for Steam System ProblemsHow did you find the installer?
If you have to take him to court, I am sure you can have someone here write up a description of what was done wrong, but let's get to the bottom of the problem first-take those pictures, with the naked pipes exposed.--NBC
@ March 6, 2014 10:35 PM in Steam traps?State supply.com would be one source. You could check Ebay for other peoples non-functional throwaways for the best price.--NBC
@ March 6, 2014 7:35 PM in Opportunity KnocksUS boiler DBA Burnham Boiler co. need some help writing an explanation for their refusal to certify their Megasteam boiler for use with a gas burner.
Good luck with your endeavors!!--NBC
@ March 6, 2014 5:46 PM in Replacing stuck Main Vents on the dry returnsAfter using PB blaster or Kroil, use an open end wrench for a good fit. Apply pressure to it, while whacking the wrench with a hammer. This should get that bushing out. An impact wrench might work as well, if you have the clearance needed.--NBC
@ March 6, 2014 5:40 PM in Boiler replacement?You could break the union between the boiler and the first elbow, and then that would be your larger pipe size horizontal header. Use two risers to come up, and drop back down into this header, both on one side of the vertical takeoff. Then connect the equalizer to the other side.
A big pipe wrench may enable you to reuse some of the old piping. Supply pipe is usually in pretty good condition.--NBC
@ March 6, 2014 5:34 PM in Atmospheric boilersWhat about putting some stainless steel sheets under the burner area to reflect back the heat?
As far as piping in combustion air, I would be a little afraid of a freeze up when the boiler was off for a period of time. Maybe bring the combustion air closer to the flame would help.
Alternatively, we Midwesterners will have to buy and learn how to use an analyzer. Using a power burner has the advantage of dialing in the burn rate to match the system more exactly I would think.--NBC
@ March 6, 2014 5:24 PM in Salvage Cast Iron Radiators773-407-7115--seems to be a business
@ March 6, 2014 3:45 PM in Completed boiler & chiller instalHot water supply
Hot water return
Cold water supply
Cold water return
Hot air (politicians floor)
Hopefully the south side chillers were pumping their heat into the north side--NBC
@ March 6, 2014 10:32 AM in System pipingMaybe 2 smaller boilers would be easier to man oeuvre, than one larger.-NBC
@ March 6, 2014 10:18 AM in Beating a dead horse.Since there seems to be a general trend to switch, rather than fight, more manufacturers will see the necessity of certifying their boilers for gas guns.--NBC