To get email notification when someone adds to a thread you're following, click on the star in the thread's header and it will turn yellow; click again to turn it off. To edit your profile, click on the gear.
The Wall has a powerful search engine that will go all the way back to 2002. Use "quotation marks" around multiple-word searches. RIGHT-CLICK on the results and choose Open Link In New Window so you'll be able to get back to your results. Happy searching!
In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.

low water cutoff controls - redundancy?

elfieelfie Posts: 264Member
here are two lwco controls



why are there two?



seems that when ball valves are opened (below the cutoff devices), the water flow comes from boiler and not pushed down thru the LWCO devices - is this ok?



is one used for high water cutoff?
jpg
jpg
0605101131.jpg
0B
· ·

Comments

  • SteamheadSteamhead Posts: 9,198Member ✭✭✭✭
    On a boiler that size

    Code requires two LWCOs and two pressure controls. One of each is a manual-reset unit that trips if the first control fails.



    On that boiler, the larger LWCO is probably also a boiler-feed pump control. the smaller should have the manual-reset feature.
    All Steamed Up, Inc.
    "Reducing our country's energy consumption, one system at a time"
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
    Baltimore, MD (USA) and consulting anywhere.
    · ·
  • JohnWayneJohnWayne Posts: 18Member
    The piping is correct

    That piping is correct.   As long as you have a head of steam on the boiler when you open the ball valves it will push through the LWCO.  If you don't feel like it is passing through you may want to open them up and make sure they are not clogged with mud.  Don't forget to check the piping as well.  The taller of your two LWCO has the three test cocks on the back.  You can use these to check the water level in the boiler if your sight glass (gauge glass) ever is to dirty to see.  The bottom valve should be straight water, the middle should be a combination of steam and water, and the top should be straight steam. 



    What Steamhead said about the code is correct as well.  One should have a manual reset on it.



    Also I noticed the gauges and pressure controls are straight piped into the header up top.  You should install siphon tubes (pigtails) to help prolong their life.  These will help create a buffer between the steam and the controls.
    · ·
This discussion has been closed.

Welcome

It looks like you're new here. If you want to get involved, click one of these buttons!