6-14 Manage CHT

Question 1

Managing CHT
Who’s responsible for:
-visual inspections of MSD
-indoc of personnel for the potential health hazards with human waste
- training periodically for cleaning and disinfecting contaminated spaces
-must be present during clean ups involving food, living, and medical spaces

Answer 1

Medical dept

Question 2

The collection, hold, and transfer system (CHT) operates in three modes:

Answer 2

• restricted waters
• at sea
• in port

Question 3

What is the most commonly used MSD?

Answer 3

Type-II B MSD

Question 4

The holding tanks of the CHT system are normally sized for how long of a holding period?

Answer 4

12 hour holding period

Question 5

In manual mode, the pumps are deactivated automatically when the low liquid level reaches?

Answer 5

10% of tank volume

Question 6

In automatic mode the low level stops the pumps at what %?

Answer 6

10%

Question 7

For the automatic mode of the CHT, what % capacity signals the duty pump to activate?

Answer 7

30%

Question 8

For the automatic mode of the CHT, what % capacity signals the standby pump to activate?

Answer 8

60%

Question 9

For the automatic mode of the CHT, what % capacity causes a visual and audible high level alarm to activate?

Answer 9

80%

Question 10

What element poses the greatest danger to ships and personnel?

Answer 10

hydrogen sulfide (h2S)

Question 11

Untreated sewage held in tanks larger than _____ gallons must be?

Answer 11

• 2,000 pounds

- aerated

Question 12

_____ is heavier than air

Answer 12

H2S

hydrogen sulfide

Question 13

How many EEBDs are in the pump rooms?

Answer 13

2

Question 14

MSD components must be regularly inspected for leaks by?

Answer 14

engineering dept

Question 15

What test is used to pinpoint small leaks from pumps and pressurized sections of the piping system?

Answer 15

paper towel test

Question 16

All leaks, spills, or other sources of contamination must be reported to?

Answer 16

• engineering officer
• executive officer
• SMDR

Question 17

What are the toxic or explosive gases associated with CHT?

Answer 17

• hydrogen sulfide
• methane
• ammonia
• carbon dioxide

Question 18

Which chemical has a rotten egg smell?

Answer 18

hydrogen sulfide

Question 19

What immunizations need to be verified as current for personnel who are in contact with wastewater?

Answer 19

• polio
• tetanus
• diphtheria

Question 20

What is the required PPE for CHT workers?

Answer 20

• coveralls
• rubber boots
• rubber gloves
• face shields
• SCBA

Question 21

How do you clean contaminated clothing?

Answer 21

use hot water and soap

Question 22

How do you clean contaminated rubber boots and gloves?

Answer 22

• washed with hot soapy water

- treated with approved disinfectant solution

Question 23

What safety procedures are followed for sewage spill cleanups?

Answer 23

follow NAVSHIPS TECHNICAL MANUAL chapter 593 POLLUTION CONTROL

Question 24

Medical, food service, and berthing spaces must be disinfected with what type of approved EPA disinfectants?

Answer 24

Germicides

• phenolic type
• iodine type

Question 25

If potable water tanks form the floor of the bilge what testing must be done? how often?

Answer 25

daily bacteriological monitoring

Question 26

What color coding are the CHT system valve handles and operating levers?

Answer 26

gold

Question 27

Within what distance is the overboard discharge of untreated sewage within U.S. waters and territorial seas prohibited?

Answer 27

within 3 nautical miles of shore

Question 28

Which CHT mode is this:

-sewage and gray waters are diverted or discharged overboard

Answer 28

at sea

Question 29

Which CHT mode is this:

-sewage and gray water is collected and discharged into a sanitary sewer through sewer risers

Answer 29

in port

Question 30

Which CHT mode is this:

• sewage are collected and stored in holding tanks
• gray water is discharged overboard via diverter valves

Answer 30

in restricted water