UNIT 6-13 POTABLE WATER SURVEILLANCE Flashcards
NAVMED P 5010- 6
WATER SUPPLY AFLOAT
RAISED FRAME TO KEEP WATER OUT
around a hatchway in the deck of a ship
coaming
process of distilling plant forms, including evaporation and condensation
distillation
chlorine available in the forms of hypochlorous acid and hypochlorite ions
(after demand is met)
Free Available Chlorine
one millionth of a meter
micron
treatment device applied to a single tap used for the purpose of reducing contaminants in drinking water at the tap
Point of Use (POU)
water suitable for human consumption, bathing, laundry, personal hygiene
potable water
achieved by external application of sufficient reverse pressure to cause the solvent to flow in its unnatural direction
Reverse Osmisis
test used to detect total coliform and E-coli in potable water
colilert. Colisure
group of closely related, mostly harmless bacteria that live in soil and water as well as animal guts.
indicate general quality of water and likelihood that water is contaminated with fecal matter
presence or absence of bacteria is the drinking water standard
Total Coliform
fecal coliform bacteria commonly found in intestines’
strong indication of recent sewage or waste contamination
Escherichia Coli (E. Coli)
responsibilities of Naval Sea Systems command
design
construction
maintenance
related to shipboard potable water systems, including treatment facilities and processes to assure safe drinking water
responsibilities of Naval Facilities Command (NAVFACENGCOM)
promulgating instructions for SHIP TO SHORE potable water connections
providing potable water from approved source when BERTHED AT A NAVAL FACILITY
**presence or absence of total coliform bacteria is ____
**drinking water standard **
responsibilities of BUMED
- establishing health standards
- instructions, notices, and publications for afloat water quality requirements
- shipboard requirements for medical surveillance of potable water systems
responsibilities of area, fleet, and subordinate commanders
water sanitation standards are provided and enforced in each ship w/in command
responsibilities of Engineering Dept.
responsible to CO for implementing requirements of NAVSEASYSCOM
responsibilities of MDR
conducting a medical surveillance program of the potable water system
Bacteriological Testing
Daily halogen testing
how many gallons per day is authorized by NAVSEASYSCOM for design considerations
50 gal/day per person
what does water hours mean
not less than 2 gallons per man a day
particularly when troop-carrying shjps loaded beyond capacity
what type of water is used for marine sanitation device system
sea water
three conditions to avoid making water while operating in
harbors or polluted seawater
ships in close formation
stripping or discharging waste or bilge water forward of the saltwater intakes
shore to ship delivery from unapproved source if treated at what minimum PPM prior to receipt
2.0 PPM
what is sea water used aboard ships for
fire mains
decontamination
marine sanitation devices
2 types of potable water plants
distilled and reverse osmosis
3 types of distillation plants
steam
waste heat
vapor compression
distillation plant that uses diesel engine jacket water
waste heat distilling plant
distillation plant that uses electrical energy
vapor compression
2 types of reverse osmosis
single and triple pass
reverse osmosis plant that requires additional disinfection such as bromine and chlorine
single pass
reverse osmosis plant that is often better than distilled water and does NOT REQUIRE additional disinfection
triple pass
potable water tanks should never be filled with
ballast water
PW hoses are labeled with
“POTABLE WATER ONLY” with 1 inch high letters every 10 feet
how are PW valves receiving or supplying potable water (risers) labeled
“POTABLE WATER ONLY” 1/4 inch high letters
how are sounding tubes labeled
clearly with ID plate
cap will be dark blue
what is the standards for halogen residuals
0.2 -2.0 ppm
who must supervise the connection between shore and ship
authorized shore station personnel or properly trained ship personnel
what is the minimum required ppm for water with doubtful quality
2.0 ppm
** state the purpose of bacteriological testing*
TG pg 636
ensure fitness for human consumption
assess adequacy of disinfection process
halogenation is more effective at what water temperatures
warmer
air craft carriers are allowed to maintain at least what level of chlorine in distal ends of distribution system
trace levels
how often is hallogen residual testing conducted and by who
daily
MDR
who is resposible for testing the halogen level of the potable water tanks after 3o minute contact time
engineering dept
what does MCL stand for
Maximum containment level
weekly bacteriological samples per personnel
400 and less
400-800
800 or more
4
8
12
samples of microbiological quality will include what portion of ice machines and potable water tanks
1/4
hw often are ships emergency potable water tanks tested bacteriologically
monthly
when a positive bacteriological test is received, what is the process
require 3 repeat samples
original service connection source
one upstream (no more than 5 service connections)
one downstream (no more than 5 service connections)
collect withing 24 hours
halogen that tests for FAC or Total Bromine Residual (TBR)
DPD #1
halogen that tests for chloramines (total chlorine) residual
DPD#4
what is the accuracy of the color comparator
+ or - 10%
what is the accuracy of portable spectrophotometer
+ or - 2%
continual absence of halogen residuals in potable water systems must be reported to who
CO
Copy to Chief engineer
how often is bacteriological testing conducted
weekly
how are bacteriological samples labeled
how much per bottle/bag sample?
incubate for how long? temp?
location
date and time
samplers initials
100ML
24 hours at 35*C
what does HTH stand for
calcium hypochlorite
for manual chlorination (batch method), what is the mixing strength of HTH
1 ounce of HTH per 5,000 gallons of water =1.0 ppm FAC
how many methods to disinfect the potable water system
3
describe “method 1” of disinfecting potable water tanks
fill tank t over flow level ADD CHLORINE TO 10PPM FAC THROUGH TANK hold for 24 hours drain tank refill with potable water w/ required halogen residual level bacteriological test negative then use
describe “method 2” of disinfecting potable water tanks
- SPRAT/APPLY DIRECTLY 200PPM FAC TO ALL TANK SURFACES
- flush inlet/outlet pipes w/ 10ppm FAC
- disinfected surfaces shall remain in contact w/ chlorine solution for a minimum of 30 minutes
- refill w/ potable water w/ required halogen residual level
- negative test use water
describe “method 3” of disinfecting potable water tanks
FILL 5% TANK VOLUME W/ 50PPM FAC SOLUTION
hold solution for 6 hours
add potable water to chlorine solution to fill tank; hold for 24 hours
drain tank
refill tank w/ potable water w/ required halogen residual level
bacteriological test
negative use water
what are the 2 methods for controlling and identifying the source of taste and odor issues
chlorination and steam methods
describe chlorination method for taste/odor issues
chlorinate to 5ppm FAC
distribute @ 2 ppm FAC
describe the steam method for taste/odor issues
requires NAVDEASYSCOM approval
boil sample water for 1 minute to ensure proper effect
if resolved then steam may be feasible
not resolved then steam wont work
Calcium Hypochlorite should not be stored in more than how many of what ounce bottles in any individual locker or bin?
48 six ounce bottles
