6.14 Flashcards
What does CHT stand for?
Collection Hold and Transfer System
3 modes of CHT
Restricted areas
At sea
Port
What type of device is CHT?
Type 2 B Maritimes sanitation device
What does the Collection element include?
Soil or sewage drains
Gray water drains
Diverter valves
What does the Hold Element do?
Retains sewage for up to 12 hours
What does the Transfer element include?
Sewage drains
Discharge piping
Associated diverter valves and check valves
How many pumps does the ship have for waste water?
2, Gray water and sewage
What two modes does the CHT have?
Manual
Automatic
What gas poses the greatest danger in CHT?
Hydrogen sulfide
Level that sewage needs to be aerated and why
2000 gallons, productions of gases pose ignite and explode
Pump rooms should have what 4 things?
EEBD
Negative pressure
Ventilation indicator
Warning plates
Who inspects for leaks of the CHT tanks? Who do they report to?
Engineering
MDR, Eng O, XO
Toxic or Explosive gases related to CHT
Ammonia
Hydrogen sulfide (eggs)
Methane
CO2
What basic immz do waste workers need?
Polio
Tetanus
What do workers do with contaminated clothing?
Place in a plastic bag after work and use hot water and soap to clean
In the case of a sewage spill, what type disinfectants do we use to clean?
Germicides- Phenolics, Iodine
What is the instruction used for Sewage spill clean up?
NAVSHIPS TECHNICAL MANUAL, Chapter 593
“POLLUTION CONTROL
What color piping for CHT?
Gold
How far do you have to be off shore to dispose of sewage overboard?
3 nautical miles
How is sewage and gray water disposed of in port?
sewer risers or Ship waste offload barges SWOB
In restricted waters what do we do with gray water and sewer water?
Gray water is discharged overboard via diverter valves
Sewage is held in the holding tank
