Aux Steam

Question 1

What is normal source of Aux steam?

Answer 1

Main steam from U-1 or U-2 reduced to ~100 psig

One unit is set slightly above 100#
Other unit is set slightly below 100# (will b/u other unit)

Question 2

X-connected Vital distribution loads on Aux steam

Common vital header loads

Non-vital header loads

Answer 2

Turbine gland Seals
Steam jet air ejectors
Dearating steam (S/u only)
Caustic regeneration system preheaters

Cardox vaporizer
Reboiler (not used)

BA batching tank heater
BA batching tank pre-heater

Question 3

PCV-69….what is it?
Interlocks?

PCV-369…what is it?
Interlocks?

Answer 3

Pressure reducing valve(MS–>100#)

If get high temp alarm (area > 130 deg) take either unit CR switch -> both unit valves will close

Question 4

Purpose of ASDR?

Inputs to ASDR?

Level control scheme?

Answer 4

Collect misc steam drains, condense and return steam -> CST

BA batching, misc stm traps, reboiler

Pump 0-1 starts @ 4” (above mid lvl)
Pump 0-2 starts @ 6.5” (above mid lvl)
LCV-98 Disch to CST