Conv Supp/Cathodics Flashcards
1
Q
A
2
Q
Definition of conv supp
A
supply changed from 450v,60hx,3ph except 115v 1 ph 60hz lighting supp
3
Q
List typical converted supp
A
- 24VDc&50Vdc=TRU’s/batteries
- 115v,400hz=SFC
- 200hz 200v=aircraft supp
4
Q
static freq changer
SFC protection
A
- V exceeds 126.5V 10% over
- Temp 120
- I exceed 10.2 A
5
Q
safety precaut on batteries
A
- Ventilation
- Eyewash
- Running water
- Safety notices
- PPE
- Safety equipment
6
Q
How do we prevent corrosion
A
- Paint scheme
- ICCP
- Sacrifical anodes
7
Q
Principle operation of ICCP
A
Hull must be negative when compared to silver ref anode to prevent corrosion, a current is applied to hull to maintain 0.8v.
8
Q
Under/Over protect cathodics
A
- Under-no corrosion protection
- Over - Blistering of paint,hydrogen embrittlment
9
Q
Dailies & monthlys cathodics
A
- D=on amp assembly-record v output,ship speed,and each ref anode
- M=portable ref electrode 8 ft below waterline,close to hull(not when ship alongside,stopped @ seaor moored)
