The Craftmans Shop > New from Old
Resurrection of a CFEI 100 KVA Induction Furnace
awemawson:
--- Quote from: Sea.dog on March 14, 2020, 08:16:40 PM --- Looking forward to the inaugural firing up :zap:
--- End quote ---
You and me both Graham, but a long way to go yet I'm afraid !
awemawson:
I've just been watching Martin Zero's video on YouTube exploring James Brindley's 'siphon tunnel' diverting water from the River Irwell under itself to drive mine pumping equipment in the 1700's - fascinating video, but he used an innovative way of getting his camera into a dangerous place (strapped to a model radio controlled tank!) - and it set me thinking . . . .
I want to investigate inside the 'chilled water storage tank' that feeds the leaking pump - I have an endoscope camera - will it work .... :scratch:
Well the answer in NO - focal length is quite wrong and cannot see anything but close ups of individual elements of the finned radiators :bang:
However - just the job to take a proper look at that broken spring on the ceramic pump seal - so here is the video with the endoscope poked down the outlet port of the pump:
hermetic:
I watched Martins video too, fascinating stuff! On the pump, looks like the spring has caught on the back of the seal spinner and got unwound, not a failure I have seen before, and I have done a few pump seals! There is usually a stainless washer at either end of the spring to stop it catching.
Phil
awemawson:
The pump motor cowl and base plate were quite rusty so I decided as the seal parts still hadn't arrived, I'd grit blast them and give them the usual zinc rich primer and satin black top coat, to make them less offensive to the eye as they sat on my bench.
I've recently made two alterations to my grit blaster that have made it significantly easier to use:
- Firstly I've fitted a long thin axial fan (ex photocopier) to blow across the cabinet window to remove the condensation from my breath that was a major obstacle to seeing what I am doing.
- Secondly I've plumbed my 104 CFM huge 18 kW Hydrovane into my air system so that I can blast at full pressure continuously without having to pause every now and again for the smaller one to catch it's breath.
All went well and paint is now drying, but guess what arrived whilst I was blasting - yes, the seal kit :thumbup:
So the next job is to dismantle the pump in a controlled fashion to keep the myriad of pieces in the correct order for re-assembly. Six stages each of which have a housing, an impeller, a gasket and two spacers.
. . .but first I must study the instructions :coffee:
(Various plumbing bits yet to turn up so no huge hurry)
awemawson:
Opening the seal instructions attached to the (vastly expensive) seal kit, there is no illustration of the specific seal used on the CH4-60 - there are illustrations of similar pumps but the ends of the spring have outward facing pegs on the end turns, whereas the kit and the pump that I have has a plain spring. So the location methods obviously differ for the bit that rotates.
It probably will be perfectly obvious when I dismantle it, but my experience of these pumps tell me it's best that you have the CORRECT drawing before bits fly in all directions (*) :clap:
Grundfos 'are surprised' and are trying to find a copy of the correct illustration to email me so I won't pull it apart at the moment.
Meanwhile the paint has dried on the end cover and mounting foot so they have been temporarily re-assembled to get them out of the way until that drawing arrives. I must say the pump looks cosmetically far better than it did :thumbup:
(* My first introduction to Grundfos pumps was when one failed in one of my Launderettes, and I got a panic and embarrassed call from the engineer who did my maintenance to say he'd dismantled the pump to replace the seal and couldn't work out what went where. I was presented with a plastic tote box with an entirely dismantled CR8 (8 stage) pump and spent the next couple of hours working out what went where - a baptism of fire - or water you might say!)
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