Piping

From Wikipedia:


 * Within industry, piping is a system of pipes used to convey fluids (liquids and gases) from one location to another. The engineering discipline of piping design studies the efficient transport of fluid.


 * Boilermakers and pipefitters are not plumbers although they work with piping as part of their trade and their work can include some plumbing.

Sizing
John S. posted on Chaski.org:


 * Steam supply lines are typically 3/8 inch diameter pipe
 * Injector lines are typically 5/16 inch diameter tube
 * Blower line is typically 1/4 inch diameter tube

Sealing
Mike Massee wrote:


 * I have been very happy with LocTite 567 High Temperature Thread Sealant with PTFE.