Mech Sys Ops Flashcards
What is the desired temp a calorifier is maintained at?
66 Degrees C
How is the adjustment carried out on a Hot Water Calorifier?
Bimetallic strip, using appropriate tools
What state the following of a boost pump in a RO plant:
- location
- function
-operating parameters
supply water to HP pump
1 bar
before pre-filters
What state the following of a HP pump in a RO plant:
- location
- function
-operating parameters
increases pressure to
What are the uses of demon water?
- gas turbine wash
- helicopter engine wash
- medical use
- WE cooling systems
- Chilled water systems
- Diesel coolant systems
what are the uses of fresh water?
- drinking water
- upper decks wash down
- laundry
- bathroom/heads
- galley
- gas turbine wash
- fuel sep
- mess decks
- weapon mag space
- technical water RO plant
what is the purpose of a conductivity meter?
to give a visual indication of the presence of salt in the sea, potable and technical water of a certain engine room
describe how a conductivity meter works
- two electrodes are placed at a predetermined distance apart in feed water system
- current is applied in series with a lamp
- the fresh water being high resistance, allows only a min current to flow
- the presents of salt in water reduces resistance, between the two, increasing the current
what three factors determine the current flow between the electrodes?
- distance between the electrodes
- the amount of salt in the water
- the temperature of the water
how do you clean the electrode probes?
- isolate
- disconnect probe
- scrub nylon brush, 50;50 solution
- rinse and refit
What is the standard of quality of water in the RN?
fresh water - 250-300 ppm
demon water- 2.5-25ppm
what is meant by super chlorination?
the process of sterilisation of FW systems using extremely high dose of chlorine
when is super chlorination done?
- on commissioning
- after the cleaning or re-coating internal surface of fresh water tank
- when is it considered necessary
what formula is used to determine amount of chlorine used for super chlorintion?
D= c/1000 x 100/A x V
D= chlorine
C= initial require amount of chlorine
A= % of chlorine in compound
V= volume of water
list the steps taken to minimise contamination and stagnation in fresh water systems on board
- swapping tanks every 24 hours
- aerator
- chlorine
- non-return valves
- lockable sounding tube caps
- leak off lines
- air escape tubes
- no dead legs