On Mon, 07 Mar 2011 23:07:21 -0500, mm
wrote:

But when the t&p valve blows for temp, it's 210 or more. Do they
blow for temp or for pressure?


Both as far as I know.

What's a detached lagging?

Lagging is insulation. Don't know how the name came about.
It's what we called a certain removable insulation used in Navy fire
rooms. Engine rooms had plenty too.
Commonly used around valve flanges, superheaters or other parts that
were expected to be disassembled for maintenance.
Basically made-to-fit asbestos cloth bags. Think they were filled
with more asbestos. Can't remember ever seeing what was inside, or
seeing a torn one.
The cloth was thick and had bulit-in metal loops so you could wire it
up. I forgot most of it. Been over 40 years since I worked with it.
The detached one that was smoldering probably had oil spilled on it.
Everything was hot there.
Lit my smokes in a hole in the insulation of feed pump turbine head.
Pump was run by steam superheated to 900 F.
Don't know how much heat you need to light a smoke, but it only took a
couple puffs when stuck in there near the turbine head.
Burned my nose a couple times, but not enough to blister.

--Vic