We discussed my plant for quite
a while, covering all its components, pressures, temps, etc.
How does an Air Cooled
Condenser work? How does a surface condenser work?
Explain
freeze protection on an ACC
Discussed my plants water treatment and testing, including NH3 and Oxygen
dosing.
Why do
you dose Oxygen into your feedwater? To form magnetite layer…
Why is
silica in feedwater bad? Will iron carry over into the ST like silica does?
Explain
how a Once-Through Boiler works; can you blowdown your HRSG?
How
does a Selective Catalytic Reduction System (SCR) vaporize the NH3?
Briefly
discussed ISO New England and the bidding process.
Discussed how we bring our GT and ST’s up, and how the steam is handled
before the ST are able to start. Can your plant fire the HRSG
separately?
Explain
the repair process on a boiler. (Ask AI for permission, etc…)
How do
you know a welding company holds an R stamp? Certificate of authorization…
Asked
about routine repairs and name the four types of routine repairs.
If you
need a tube rolled in, do you need a company that holds a R stamp?
If you
needed to have a repair performed on boiler external piping, can you hire
any company, what stamp do they need?
Where
does boiler external piping start and end?
What is
the weakest part of a boiler, I answered any flat surfaces, he then said not
in a firetube boiler but in a watertube boiler, I said the drum, he then
gave a hint by asking what ligament efficiency was. I told them the formula,
and that it must be the lower drum sheet, as they make it thicker to
compensate for the tube holes.
What is
a blister, what causes it?
How
would you size a steam line in new construction?
How do
you calculate boiler efficiency?
What is
the Mollier chart, what can you do with it?
How do
you size a superheater safety valve?
What
does the code say about two safety valves mounted singly?
List
the range of safety valve settings allowed.
How do
you size an economizer safety valve?
Briefly
asked about 310 CMR’s
At what pressure are two gage glasses required?
