The valves, ranging would be gate or globe valves, sizes of 8-12" for steam condensate service, sub-atmospheric pressure, ~80 deg. C/ 176 deg. F.

The largest and most potentially dangerous pieces of "blue ice" have been associated with "donut" valves".

I can't seem to find how accurately the Class 4 torques tools for manual valves can be controlled.

The small bypass equalization line is a product of an industry problem with gate valves for thermal binding and presure locking.

Respect to valve that are used in offshore oil and gas industry. A perticular manufacturer supply us valves complying all the testing and specification requirement.

Do seat ring welding rods need to be pre-heated? I've been told that they do not.

If I have understood this correctly, in reverse acting gate valves, you pull the plug up to close the valve. Gate down = open valve.

Some good source of Relief Valves Problems/Design.I have one recommendation for Relief Systems Handbook from Cyril F. Parry.