To drainpipe, or not to drainpipe.

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Rendelf

New Member
Oct 24, 2023
1
South Wales
Greetings hearthlings! First-time poster here! :D

Looking for a little advice or a dressing down. What I'm about to ask is clearly not to code!

UK-based human here - spent a lot of time in the woods and on boats and in busses.

Recently acquired a cheap old Jotul 602 for an old corrugated steel workshop. I don't want to spend a lot of money on flue and double-walled this and that.

Locally, someone is selling five metre lengths (16') of steel pipe (4mm wall thickness) for the price of a single section of vitreous enamel pipe.

The o/d of the pipe is 120mm (4.5") and this is the same as the o/d of the top of the stove.

The old way of doing this in boats and busses is to just put the old steel pipe on top of the burner, obviously making sure there is a good seal and nothing is going to catch fire, and send the pipe up through the roof. However, this is usually for a short run of pipe.

In this case, the pipe would intersect with a 30 degree corrugated steel sheet (either with a specific silicon flangey-thing or just a tight hole sealed with heat-resistant sealer) and continue above the roof by a metre or two. Will probably secure from wind with some steel cable above the roof.

Temperatures here rarely drop below freezing and even then, only by a few degrees.

My questions then:

1. Do you think the full length will draw okay straight up?

2. I think the stove should be fine bearing a lot of the pipe's weight, but do you think it's a good plan to suspend the pipe using cables to reduce the weight on the stove?

3. Any suggestions for the interface between the pipe and the stove (both have the same diameter) - I was thinking something like a 125mm-130mm adaptor sealed with putty.

Many thanks for any input!