Ht a school test 2 CHT Questions And Answers

What toxin has a strong odor of rotten eggs - ANS Hydrogen sulfide What are the 4 switches - ANS 10% low level pump turns off 30% duty pump will turn on 60% stand by pump will start 85% high level alarm will sound Which has is highly flammable - ANS Methane Where is the sewage transfer hose stored - ANS Never stored on the ship Sewage transfer hose diameter - ANS 4 inches Where are drip pans not required? - ANS Topside When was the oil pollution act created - ANS 1961 What's the sewage capacity - ANS 490 gallons What is the minimum ventilation time before entering a tank - ANS 30 minutes How long do you allow sewage line to flush? - ANS 10 minutes Which zone is 0-3 nautical miles from shore? - ANS Restricted zone What is used to pulp or liquefy sewage solids before they enter the CHT tank - ANS Comminutor How many switches are there for the mercury switches - ANS 4 What happens at 85% on a mercury system - ANS High level alarm will sound What send a signal to several components to activate a certain function - ANS Mercury switches What color is soil - ANS Black water Any waste material that contaminated the air, soil or water is called? - ANS A pollutant What two things does a sewage pump discharge from shipboard CHT frame to pier side - ANS Seawater and sewage How many nautical miles long is the prohibited zone - ANS 0-50 How many nautical miles is the contiguous zone - ANS 3-12 What is the most common type of sewage transfer hose - ANS Collapsible What is the 3 way ball valve that changes direction of flow to tank or overboard depending on operational mode - ANS Derivativer valve What are the components of the aeration system - ANS Aeration blower and ships service air system What are the components of motor controller - ANS Auto, man 1, man 2, start, stop and reset The contingous zone is also known as - ANS Coastal zone What are Characteristics of the alarm panel - ANS Visual audible normal standby and cutout Low pressure low volume rotary air compressor are characteristics of a - ANS Aeration blower Hydrogen Sulfide is produced in how many hours - ANS 6-12 How long should holding tanks be flushed for - ANS 30 minutes What are you never allowed to do to a CHT pipe - ANS Lagging What are the 2 common disinfectants - ANS Beta dune and weska dyne What does sdcss stand for - ANS Sewage disposal operating sequence system What system is the secondary system for aeration if primary system fails - ANS Ships service air system What is the abbreviation for hydrogen sulfide ? - ANS H 2 5 What is the holding tank less than 2000 gallons - ANS Strainer type CHT system What system has a holding tank that holds larger than 2000 gallons - ANS Communicator What is presence of oxygen - ANS Aerobic What reduces solids and semi solids into small particle size - ANS Comminutor What prevents 1 pump from pumping sewage back to the tank through the adjacent pump - ANS Swing check valve Waters that drain from shower lavatories laundries galleys scullery sand sink is - ANS Waste How many mercury switches does a strainer Tyler CHT system have - ANS 1 Tanks are to be flushed and pumped out how often to prevent toxic gases from forming - ANS Weekly What is the most common toxic gas - ANS Hydrogen sulfide VCHT has an ejector that has how much horse power - ANS 7.5 What are the three modes of operation - ANS At sea, transit and inport Waste of human origin is called - ANS Soil What year did the CNO make CHT systems a requirement aboard all navy ships? - ANS 1972