boiler tundish

[Wyzzard]

I am reviewing a P&ID for heat recovery boiler, and there is a term used I am not familiar with. Tundish. Can any help with this term?

 

[JStephen]

That's a new one on me, but googling "tundish boiler" turns up several hits that could describe the item in question.

 

[Wyzzard]

Thanks JStephen. I did google it. Hence the question here. The internet definition indicates that it is like a conical tube or a funnel to fill a pipe for drainage purposes. My drawing has numerous drain lines. Some go to "tundish" others just say "drain". But I think they all end up in condensate.

 

[crshears]

In my experience, tundish is the name given to a collecting funnel of any shape, of a size typically but not necessarily no larger than would fit into a 50 cm x 50 cm x 50 cm cube, into which numerous drains are directed; the outflow from a tundish is typically to storm sewer, that is, untreated, as opposed to a sanitary sewer.

I too scratched my head when encountering this term for the first time in 1977...

CR

"As iron sharpens iron, so one person sharpens another." [Proverbs 27:17, NIV]

 

[Hoxton]

From memory, I came across this over 40 years ago, one of the 'old timers' described at like a saucer, suspended under a drain or overflow, so that any drips would collect in the saucer and give indication of fluid.

Remember it as being suspended by three chains, like a hanging basket in a garden!

I think that I was told that the expression came from brewing, so the tundish would be suspended from a tap and would indicate any leaks.

Tun is a size of barrel, I think.

 

[crshears]

Over the past forty years I have consumed brewery products from time to time, but I have never been employed in, nor ever toured, a brewery; all of the tundishes I've seen were more or less custom-flanged so as to fit snugly into the floor drain into which they were to discharge, and as such none were of pendant design. They did however answer the purpose of providing positive visual indication of flow, generally in my case of raw water through shell-and-tube coolers of various sorts.

CR

"As iron sharpens iron, so one person sharpens another." [Proverbs 27:17, NIV]

 

[CANADIANBOILERENG]

As others have mentioned, the tundishes are drip trays. On a recovery boiler this primarily refers to the drip pan under the safety valves on the steam drum and superheater headers. Typically a flat bottomed circular tray welded directly to the outlet pipe of the valve and detached from the vent line. Enough room needs to be left for boiler expansion in the hot and cold position when installing.