Ventilation And Chilled Water System Flashcards
Learn the title
What are 4 uses of ventilation?
Cooling of electrical equipment Habitability CBRN Main machinery space cooling Galley ventilation
State the 4 ventilation configurations?
Fan supply and fan exhaust
Fan supply and natural exhaust
Natural supply and Fan exhaust
Natural supply and Natural exhaust
State 4 types of ventilation filter
Fireproof gause Panel filter Dust filter Lint filter Grease filter Supply filter
What are the 4 places that require special filters?
Galleys Storage rooms Auxiliary machinery spaces Sewerage treatment spaces Magazines
Briefly explain the requirements of ventilation in a sewerage treatment plant
Requires 15 air changes per hour
Excess of exhaust capacity to supply
Limited supply under closed down conditions
Exhaust trunking is led to a low down place to make sure that all hydrogen sulphide is removed
Which compartments would require fire flaps?
Galleys
Main machinery spaces
Magazines
What percentage of air is recirculated/fresh?
67% recirculated
33% fresh
What CBRNDC state will an AFU be used?
CBRNDC state 1
Briefly explain the 3 types of filter in the AFU
Pre particulate - a paper filter which removes large particles such as nuclear fall out
Particulate - made of glass fibre designed to remove small particles such as bacteria
Gas filter - active charcoal filter that removes chemical gases and vapours
What is the citadel?
The citadel us a section of the ship that is sealed off from the rest of the ship and pressurised to stop leaks from being a problem
When should the citadel be tested?
Annually Prior to extended docking duration During sea acceptance trials During harbour acceptance trials When doing a FOST exercise
When yould an air bleed valve operate?
Half an inch water gauge
When would a crash stop be used?
If a fire or a crash on deck occurs
Where would a crash stop board be operated?
Ships control centre
When would the fans be restarted?
When vents have been checked that they are free of smoke, welding fumes and debris
What systems are supplied with chilled water?
Radars
Ships computer systems
Air treatment units
Weapons systems
What is the main difference between a refrigeration and a chilled water system?
A chilled water system has a heat exchanger instead of an evaporator
What provides cooling for condenser and motors?
A large seawater cooling pump
