Resurrection of a CFEI 100 KVA Induction Furnace

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russ57:

--- Quote from: AdeV --- I got some experience with a DEC VAX machine, which left me with an enduring soft spot for VMS. To the point I currently have 6 MicroVAXes..... As much as I'd like an 8800, I don't think I've got suitable storage space for it!

--- End quote ---

One of my recent projects was migrating some mission critical apps on openVms from alpha hardware to an alpha emulator running on Linux running on vmware esx running on x64 hardware. One of the apps was originally running on Burroughs A series, ported to Vax.

-russ

awemawson:
Progress on the foundry has been held up by 'other stuff', but also by a persistent roof leak many have tried to cure :(

The foundry is an 'addition building' to the welding shop which is an 'addition building' and the leak is where the three roofs join.

Initial problem is that the foundry fibre cement roof has been laid to too shallow a pitch (4 - 4.5 degrees - 'big six' should be at least 5 degrees) so water was tracking back up the corrugations and entering at joins - this has been solved by painting with a patent fibre loaded roof sealant.

However, the 'welding shop roof' tucks under the overhang of the 'main workshop roof' then the foundry roof abuts this but the levels prevented the roofer properly flashing the junction with (say) sheet lead. Joins have been 'reinforcing mesh' taped and again painted with the gunge and I really thought that the problem was solved until the wind came from a different direction and again we got water in :bang:

This was traced to water entering the ridge of the main workshop and running down inside to the join. This was hopefully sealed a few days back but we've had no rain since.

I've just been out to inspect as we've had light drizzle for an hour or so, and darn me there is moisture on the floor - but now I'm confused as to whether perhaps this is not a leak but the floor sweating :scratch: No sign of water where the previous ingress was.

To sort out in my mind the layout of the three roofs I went onto Goggle to try and expand the view and much to my amusement I find where the leak is was some very odd looking object. It took me some while to realise that it is one of the many roofers 'caught in the act' of trying to fix the leak :lol:

awemawson:
We've just had a bit of 'significant' rain in the last hour, and this shows that the roof IS still leaking and there's no point in trying to convince myself that it was the floor sweating :(

I'm very tempted to try injecting squirty expanding foam in large quantities from below into the voids that must exits up between the three roofs, after all there have been many attempts to stop it coming in from above by people far more qualified than me.

Can it make things worse - answers on a post card please . . . . :scratch:

hermetic:
Two observations Andrew. It is usually possible, and indeed usually far easier to make things worse than it is to make them better! Trying to fix a leak from underneath doesn't work in my experience. I think you or someone else (preferably you and someone else) need to go up on crawling boards and have a look. Now is not the time of year, but if needs must you CAN paint Chromapol on to a wet roof, the water wicks up through it and it does work, even though it sound unlikely! If the big 6 is in decent condition, and it looks like it is leaking at one place only, you need to start at the top where the roofs meet, and work your way down, removing all the moss and dirt, and any previous attempts to repair the leak, and you need to look carefully. We had a recent leak on a built up felt flat roof, which dripped into the kitchen quite consistently, and I eventually found a tiny crack in the felt, which I scraped out and filled with Chromapol, even though I was very dubious that I had actually found the leak, but it cured it! Nothing more depressing than a leaking roof, I wish I lived closer I would be up and fix it!

awemawson:
I think the count is now 5 (or may be 6 now) experienced roofers have attacked this without success Phil and every seam, join and overlap have been coated in several applications of Chromopol as have bolt heads etc.

Moss has been removed - the sheets are only about 10 /12 years old, and much crawling about on scaffold boards has been done !

Careful application of a hose pipe gradually working up the roof did at first reveal a weak spot, initially one fixing bolt head lowish down and then right on the ridge / apex of the workshop where water tracked down under the facia / barge board so some twenty foot from where the water emerged. Since then nothing shows up until it rains. This evening there wasn't even significant wind !

. . . but thanks for the thoughts and anyway a bit of googling has revealed that none of the expanding foams create fully closed cell product - the best seem to be 70% closed cell so will become waterlogged.

. . . . foamed cement perhaps :lol:

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