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
