[Amps] Shipping a heavy HV Transformer

[David H Craig]

	Hi Ed,

	Great to hear from you even indirectly.

	My Harbach purchases of similar size  arrived with a plywood base as I recall, an if my CRS-ridden memory serves correctly, this was then encased in a heavy duty cardboard box (all 3 dimensions). They key however was the insulation (and the "This Side UP!" sticker... Anyway, the transformer was bolted to the base (which I recall was 3/4" to allow for countersinking the bottom bolts) and then (or rather more likely being cardboard boxed) wrapped in an insulation foil (likely aluminum) impervious to acetone and other foam insulation sealers. The interior was then thoroughly sprayed with what I believe was polyester resin-based spray foam. It was likely the high-expansion type, as it conformed to every curve, corner, you name it. If I ever ship one again I'd do the same thing.
	My $.02 would be use either a thick aluminum foil carefully conformed as best you can, or a piece of foil insulation to cover the transformer (base wood included.) I'd then line the outer cardboard box with wax paper overlapped as roofing paper (tar paper) is and tape the seams w/ Tyvek tape, or spray it with anything acetone/MEK/ polyester  has no absorption or other effect.  Last and most important: After transferring the covered transformer to the box, a can of polyester spray foam to fill all voids.
	You could also make a solid plywood box but the use of polyester resin-based filler is the same. If however the plywood box happened to have NOT been coated with wax paper (or mold-release wax builders use for fiberglass hull molds) you'll have one whopper of a task before you to just unwrap it.  If I can find my photos of the last one I purchased I'll send them on.

	Good luck & belated Merry Christmas / HNY.

	73, Dave N3DB

-----Original Message-----
From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Ed Stallman
Sent: Friday, January 19, 2018 7:06 PM
To: amps at contesting.com
Subject: [Amps] Shipping a heavy HV Transformer

I'm selling a HV Transformer  and have questions on the best way to pack. The transformer weighs 85LBs and is approximately a 12 inch cube . 
At this time I have it bolted to a 5/8 inch plywood pallet.

I know Alpha and Acom ship their transformers in a heavy duty cardboard box . I'm not sure where to find a heave duty box ?  I could use 3/8 or
7/16 plywood plus wood screws to build a nice strong box  but I'm thinking UPS or Fedex wants it to be in a cardboard box ?

Your thoughts and ideas are appreciated

Ed N5DG




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