What is this ?

Brad White_79

What I love about our countries, Aidan- separated by a common language... :)

I like your terminology better. If the dosing pot is too large it may have to be delivered by lorrie and take a lift to get it into your flat, am I correct?

:O)

Thanks for the reminder point on closing the valves after dosing. Best point of all.

Cheers,

Brad

S Ebels

What's this for

This apparatus is piped into a 2" main feeding the suction side of a B&G circ. The lines coming into and out of this are 1" and T into the main about 16" from each other. There are no other valves other than what you see in the picture besides a pair located right where the t's come off the main.

This is on a 400K boiler system in a bank (referenced in Eugene's section of the Wall) and I've never run across anything like this in my travels. The funnel shaped thingy on the top (maybe it is a funnel) is cast iron and the device itself is steel. It's located about 6' below where the gozinta and gozouta pipes are T'd into the main.

173 is the device and 158 shows the boiler piping with the T's are in the upper right of the pic.

Ron Huber

funnel

the funnel tells me that it was used as a fill point and the cannister below that may be some time of sediment trap,but hey, it's Friday and my thinking cap is worn out for the week!!

S Ebels

Thay's what I thought too

Until I considered that the fill point is lower than 95% of the rest of the system.

DanHolohan

Most likely

a chemical feeder. It should be on the discharge side of the circulators, though, so the chemicals get mixed before heating the mechanical seals.

Brad White_78

Chemical shot feeder.

Dan is correct. Every system of any size should have one IMHO. Dan is also correct in that the chemicals should be well-mixed especially if solid/crystaline, before the seals. Should be piped across supply and return for best effect. If off a common line without a restrictor between tees, well, no flow...

Jim_61

What is it?

Not a sediment trap. It is used to add chemicals to a hydronic heating system. Most often a chemical that will maintain a proper pH value.

S Ebels

Ayah

That's the thing. As you can see from the picture of the main line this feeder is attached to, there is no valve between the tees. I don't understand how it's supposed to work set up the way it is.

Brad White_78

Gravity Flow and Osmosis

at best. You would be doing them a favor to get some differential in there. Normally the inlet flow goes in the bottom and leaves out the top by the way. This up-flushes any precipitating solid chemicals.

Most chemicals these days are in liquid form so this should not be much of an issue going forward.

Aidan (UK)

Dosing pot

A chemical dosing pot is what it's called here.

http://www.pipesolutions.co.uk/pdf/CHEMICAL DOSING POTS.pdf

And you need to close the isolating valves after use, you can get a lot of water short-circuiting the system through them if they're conected across the pump F&R.

Josh_10

Yup, I have never seen a system without one commercially. We install metering devices now that inject a proportional amount into the primary loop. We just call em pot feeders though just in case you want to use the industrial lingo.

Paul Rohrs_5

I was thinking

it was a chemical feed.

I have been thinking about fabbing up one for my PVB and sprinkler system. I can (after the backflow) inject liquid fertilizer into the sprinklers instead of walking around with granular fertilizer. Crazy idea?

Paul

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