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'some metals in contact with each other can cause corrosion', but without any real clue about what metals will do that.
Don’t mock the pipe cleaners, Chris. We used to build whole refineries with plastic tube and moulded fittings, and made up pressure vessels all to perfect scale. Then attached labels with the dimensions and went direct from that to isometric drawings of individual pipes with material lists for the welders. No layout drawings.Main problem was the plastic tended to melt if we tried to fire it up to see if it would run. Also turbines were lacking in internal detail!That was real 3-D modelling, way before all this virtual stuff.MJM460