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Prev Med test II > 6:13 > Flashcards

6:13 Flashcards

1
Q

Coaming

A

A raised frame to keep out water (Frame around a hatchway)

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2
Q

Distillation

A

total process the distilling plant forms, including evaporation and condensation

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3
Q

What is FAC

A

Free available chlorine
Chlorine available after the demand is met
(normal range 0.2-2.0ppm)

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4
Q

Define Micron

A

a unit of length, one millionth of a meter

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5
Q

Define point of use (POU)

A

a treatment device applied to single tap used to reduce contaminant in drinking water at the tap

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6
Q

Potable water

A

Water suitable for human consumption, bathing, laundry and personnel hygeine

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7
Q

Define reverse Osmosis

A

reverse the natural osmosis achieved by external application of sufficient pressure to cause it to flow in a unnatural direction

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8
Q

Define Colilet/Colisure

A

test used to detect total coliform and ecoli in potable water

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9
Q

Define total coliform

A
  • a group of closely related, mostly harmless bacteria that live in soil, water and gut
  • The presence or absence of total coliform bacteria is drinking water standard
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10
Q

Define Ecoli

A

-A type of fecal coliform bacteria commonly found in the intestines of
animals and humans.
-E. coli is short for Escherichia coli.
- in water is a strong indication of recent sewage or animal waste
contamination.

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11
Q

Responsibilities of NAVSEASYSCOM

A

Responsible for the DESIGN/ CONSTRUCTION/ MAITNANCE of shipboard potable water.
to Include treatment, and facility process assuring drinking water is safe

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12
Q

Naval Facilities Engineering Command (NAVFACENGCOM) Responsibilities

A

responsible for promulgating instructions for ship-to-shore potable water connections and for providing potable water from an approved source when the ship is berthed at a naval facility.
(Supply water Shore)

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13
Q

Chief, BUMED responsibility for water

A
  • Responsible for establishing and promulgating health standards for water
    quality afloat
    -Promulgate appropriate instructions, notices, or other publications to reflect
    afloat water quality requirements.
  • Establish the shipboard requirements for medical surveillance of potable
    water systems.
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14
Q

Responsibility for Area, fleet and subordinate commanders

A

Responsible for issuing the necessary
implementing directives to ensure that adequate water sanitation standards are
provided and enforced in each ship within the command.

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15
Q

Responsibilities of the CO with water

A

responsible for promulgating a water sanitation bill to
ensure that procedures for receipt, transfer, treatment, storage, distribution, and
surveillance are provided and followed.

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16
Q

Responsibility of the Engineering Dept. with water

A

Responsible to the CO for implementing the requirements of NAVSEASYSCOM.
-Supply and treatment of Potable water
-Potable water system components that:
-Ensure that all ship-to-shore and ship-to-ship connections are made only by
authorized personnel, when available,
-Halogen and pH testing
-Ensure minimum halogen residuals are maintained at a potable water tank
before placing the tank on-line to the potable water distribution system.

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17
Q

MDR responsibilities with water

A

-Bacteriological (BACTI) Testing (weekly)
-Daily Halogen Testing (daily)
-MDR shall notify the commanding officer of any discrepancies observed in the
potable water distribution system.

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18
Q

Minimum usage requirements for potable water afloat

A
  • New ship need 50gal per day as specified by NAVSEASYSCOM
  • Doesn’t apply to “water hours”
  • no less than 2gal a day
  • Sea water is used for marine sanitation device systems
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19
Q

Approved sources of potable water

A

-Distillation, Reverse Osmosis (RO), or other NAVSEA approved water
production technology.
-Shore-to Ship delivery from an approved source.
-Other OCONUS locations may be obtained from U.S. Military
representatives ashore or Navy Environmental Preventive Medicine
Units (NEPMU)
-Ship to Ship
-

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20
Q

What foreign allies can we take water from?

A

British royal Navy
Canadians
Royal Australian Navy

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21
Q

When can you not make water?

A

1) Harbors or from polluted seawater.
2) When ships are operated in close formation.
3) When stripping or discharging waste or bilge water forward of the
saltwater intakes.

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22
Q

Seawater is used aboard ships for what?

A

fire mains, decontamination, and for marine sanitation devices (MSDs) flushing.

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23
Q

Ship to shore from an unapproved source must be treated to a minimum from what

A

2.0ppm

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24
Q

two types of water production plants

A 
Distillation plant
Reverse osmosis (RO)
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25
Q

Types of Distillation plants

A
  • Steam Distilling Plants - uses steam supplied by power plant or auxiliary boiler
  • Waste Heat Distilling Plant - uses heat derived from Diesel Engine jacket water
  • Vapor Compression Type - uses Electrical Energy
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26
Q

Reverse osmosis removes particles as small as what?

A

1 micron

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27
Q

Singles pass RO require what

A

Additional disinfection such as Chlorination or Bromination

28
Q

Triple pass is normally located where?

A

typically subs

29
Q

What are the components of a shipboard water system

A 
Potable water tanks
Vent and overflow lines
Manholes
water level measurement
filling lines 
piping
30
Q

What are some rules for potable water tanks

A

never fill with ballast water(unless needed for survival of ship)
Coating must be NSF/ANSI

31
Q

Vents and overflow lines should have what and cant terminate where

A 
18gauage mesh or finer/non corrosive
Food spaces
Medical
Toilets
Electrical areas
exterior of ship
32
Q

Ways to measure water levels

A

Automatic( direct read gauges)
Petcocks (various intervals)
Sounding tubes

33
Q

What are the requirements for Sounding tubes

A

Disinfect prior to use
100ppm FAC for 2 minutes
labeled “POTABLE WATER USE ONLY”

34
Q

Requirements for filling lines

A
  • Dark blue-potable water
  • 18in from deck
  • turned downward
  • screw caps with keeper chains
35
Q

requirements for piping

A

-Potable water piping passing through non-potable water tanks must have
the pipe surrounded by a sloped self-draining pipe tunnel
-Potable hot water settings should be set so the temperature at the fixture
is 120 degrees F at the water tap.

36
Q

Sanitary requirements for Potable water hose lockers

A

Vermin proof
locked
18 in off the deck
printed step by step direction on the inside

37
Q

Potable water hose

A

replace when cracks develop or lining leaks
not used for anything else
approved for potable water

38
Q

Labeling of Potable water hose

A

Labeled “Potable water only” 1in letter

coupling dark blue

39
Q

Labeling Potable water riser

A

warning plate “Potable water only” 1/4in letters

valves and valve handles dark blue

40
Q

Sounding tubes

A

clearly labled plate

capped with dark blue

41
Q

Labeling of Potable water hose locker

A

“potable water hose

42
Q

Water transfer onto a ship

A

minimum 0.2ppm

Doubtful quality water should be 2.0ppm

43
Q

Purpose of the Halogen residual

A

quick indication of water that may not have been properly treated
absence of Halogen may indicate contamination

44
Q

What is the purpose of bacteriological testing

A

Ensure fitness for human consumption

Asses adequacy of disinfection process

45
Q

Halogen residual is tested by who and how often?

A

MDR
Daily and conjunction with bacterial analysis
prior to receipt of Potable water

46
Q

Micro biological quality testing is based on what frequency

A

Population dependent
400 personnel or less, no less than 4 samples
Over 400 - 800 personnel, require 8 samples.
More than 800 require 12 samples.
Samples will include ¼ of ship’s ice machines & ¼ of the ship’s potable
water tanks.

47
Q

How often are emergency potable water tanks tested?

A

Monthly

48
Q

DPD #1 test what

A

Test for FAC and TBR

49
Q

DPD #4 test what?

A

Test both FAC and that already used

50
Q

Color comparator is accurate to wat percent?

A

+/- 10

51
Q

Portable Spectrometer is accurate to what

A

+/- 2

52
Q

Absence of residual halogen is reported to who

A

CO/CHENG

53
Q

How often do you test BACT?

A

Weekly

54
Q

What are some other reasons to test BACT

A

(1) Whenever abnormal halogen demand is present
(2) Suspicion of contamination
(3) After repairs to potable water system

55
Q

BACT testing procedure

A

Label bag with Location/ Date and time/ samplers initials
Collect 100ml tap water in bag containing Sodium thiosulfate
incubate for 24hrs

56
Q

Describe Colilert?

A

(1 Clear is negative
(2 Yellow is positive for total coliform
(3 Fluorescent yellow (under UV light) is positive for fecal coliform

57
Q

Describe Colisure

A

(1 Yellow is negative
(2 Magenta is positive for total coliforms
(3 Fluorescent light blue is positive for E. Coli

58
Q

Records colisure/colilert results where

A

Potable water log or TMIP both negative and positive controls

59
Q

Two methods of water disinfection?

A

Bromination and Chlorination

60
Q

Automatic Chlorine disinfection

A

Injects hypochlorite into system in proportion to the flow of water.

61
Q

How do the brominator work?

A

preset to deliver 0.7 ppm bromine during normal operation procedure

62
Q

How does the Recirculation brominator work?

A

boost bromine residual in potable water tank as it cycles it through the system

63
Q

Describe the Batch method for water disinfection

A 
Least desirable method of water disinfection
Calcium Hypochlorite (HTH) disinfectant of choice
64
Q

For batch method the slightly yellow liquid is called what?

A

Supernantant

65
Q

Chlorine dosage rule of thumb

A

One ounce HTH Per 5,000 gallons of water equals 1.0 ppm FAC

66
Q

Halogen residual numbers

A

(1) Water from approved source: 0.2 ppm FAC/TBR after 30 minute contact time.
(2) Water from Unapproved source: 2.0 ppm FAC/TBR after 30 minute contact time.
- If the ships brominator cannot achieve a TBR of 2.0 ppm, the water must be chlorinated by “Batch Method”.

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