On Mon, 15 Feb 2010 07:18:54 +0000, Mike Tomlinson wrote:

In article , YAPH
writes

I take it that was the plate heat exchanger (sort of brick-like metal
block with 4 holes or pipes on it)?

No, it was a metal cylinder (like a drinks can on steroids)

Blimey, bad news if that had blocked up.

Silt = black gritty/flakey crud?

Yes, larger grains than sand, black, quite loose, not adhering to
anything at all.



--
John Stumbles -- http://yaph.co.uk

It's bad luck to be superstitious.