Manage Portable Water Surveillance Flashcards
definition of coaming
a raised from (as around a hatchway in the deck of a ship) to keep out water.
definition of distillation
the total process the distilling plant forms, including evaporation and condensation
definition of Free Available Chlorine
chlorine available (after demand is met) in the forms of hypochlorous acid and hypochlorite ions.
definition of micron
a unit of length. one millionth of a meter
definition of Point of Use (POU)
a treatment device applied to a single tap used for the purpose of reducing contaminants in the drinking water at that tap.
definition of potable water
water that is suitable for human consumption, bathing, laundry, personal hygiene
definition of reverse osmosis
the revers of the natural osmosis achieved by external application of sufficient reverse pressure to cause the solvent to flow in its unnatural direction
definition of Colilert/ Colisure
test used to detect total coliform and E coli in the portable water
total coliform
are a group of closely related, mostly harmless bacteria that live in soil and water as well as the guts of animals. The extent to which total coliforms are present in the water source can indicate the general quality of the water and the likelihood that the water is contaminated with fecal matter. The presence of absence of total coliform bacteria is the drinking water standard.
definition of E Coli
a type of fecal coliform bacteria commonly found in the intestines of animals and humans. E coli is short for Escherichia coli. The presence of E. coli in water is a strong indication of recent sewage or animal waste contamination. Sewage may contain many types of disease causing organisms.
command responsibilities for potable water afloat: Naval Sea Systems Command (NAVSEASYSCOM)
responsible for the shipboard potable water systems, including treatment facilities and processes to assure that safe drinking water is available at all times.
Design
Construction
Maintenance
command responsibilities for potable water afloat: Naval Facilities Engineering Command (NAVFACENGCOM)
responsible for promulgating instructions for ship to shore potable water connections and for providing potable water from an approves source when the ship is berthed at a naval facility.
command responsibilities for potable water afloat: Chief, BUMED
a) responsible for establishing and promulgating health standards for water quality afloat
b) promulgate appropriate instructions, notices, or other publications to reflect afloat water quality requirements
c) establish the shipboard requirements for medical surveillance of potable water systems
command elements responsible for portable water afloat: Area, Fleet and subordinate commanders
responsible for issuing the necessary implementing directives to ensure that adequate water sanitation standards are provided and enforced in each ship within the command
command elements responsible for portable water afloat: commanding officers
responsible for promulgating a water sanitation bill to ensure that procedures for receipt, transfer, treatment, storage, distribution, and surveillance are provided and followed.
command elements responsible for portable water afloat: engineering department
responsible for the commanding officer for implementing the requirements of the NAVSEASYSCOM.
1) supply and treatment of potable water
2) potable water system components
3) f ensure that all connections are made only by authorized personnel
4) halogen and pH testing
5) ensure minimum halogen residuals
engineering department are responsible for potable water systems that:
receive store distribute produce treat
command elements responsible for portable water afloat: MDR
medical surveillance
1) bacteriological testing (BACTI)
2) Daily Halogen Testing
MDR shall notify the commanding officer of any discrepancies observed in the potable water distribution system.
for new ship construction, how many gallons per man day is specified by NAVSEASYSCOM for design considerations
50
minimum usage requirements of potable water to not apply to what:
“Water Hours”
what are “water hours” criteria
not less than 2 gallons per man per day
particularly applicable to troop carrying ships loaded beyond capacity
sea water is used for marine sanitation device systems
approved sources of potable water for naval ships
1) distillation, reverse osmosis, or other NAVSEA producing tech
2) shore to ship delivery form approved source
3) shore to ship delivery from unapproved source
4) ship to ship
5) seawater is used aboard ships such as in the fire mains, decontamination, and for marine sanitation devices (MSDs) flushing.
Shore to Ship delivery from an unapproved source parameters
treated to 2.0 ppm prior to receipt
types of water production plants found aboard navy vessels
distillation plants
reverse osmosis
types of distillation plants
steam distilling plants
waste heat distilling plant
vapor compression type
steam distilling plants use steam supplied by what
power plant or auxiliary boiler
waste heat distilling plant uses heat derived from what
diesel engine jacket water
vapor compression type uses what kind of energy
electrical energy
Reverse osmosis can be be either single pass or:
triple pass
Reverse osmosis removes suspended particles as small as how many microns?
1 micron
for single pass RO plants, what kind of additional disinfection is needed
chlorination or bromination
triple pass RO plants required additional disinfection:
none is required.
what is the PSI of the water where it is introduced to the RO membranes
1000 psi
describe a potable water tank
coating is NSF/ANSI standard
carefully monitoring
should never be filled with ballast water (except emergency)
characteristics of vents and overflow lines
located to reduce accidental contamination
screened with 18 g or finer non corrosive mesh
what are the unauthorized termination points for vents and overflow lines
food service spaces medical spaces toilets electrical or electronic rooms exterior of the ship
characteristics of manholes
construction and location should minimize contamination
if top of tank is also deck, 1/2” curb above deck.
characteristics of manholes
construction and location should minimize contamination
if top of tank is also deck, 1/2” curb above deck.
if on side of tank, flush mount okay
types of water level measurement
automatic level gauges
petcock
sounding tubes
two ways of measuring with a sounding tube
sounding rod, that remains in the tube
steel tape that needs disinfection
how much ppm FAC and for how long do you disinfect steel tape for sounding tube measurements
100 ppm FAC for 2 minutes.
how must sounding tubes be labeled
“POTABLE WATER USE ONLY”
Filling connections (hose valve, Riser) characteristics.
clearly labeled
dark blue
18in from deck
turned facing downward
screw caps with keeper chains
potable water filling lines which distribute potable water to non potable water tanks must have what
an air gap or backflow prevention device.
potable water piping passing through non potable water tanks must have what
the pipe be surrounded by a sloped self draining pipe tunnel
what temperature is the potable water hot water set to at the fixture
120 degrees F
requirements for potable water hose lockers
vermin proof
locked
18 inches off the deck
printed disinfection instructions.
requirements of the potable water hose sanitation.
examined routinely
removed when cracks form
capped or coupled when not in use
labeling requirements for hoses
“POTABLE WATER ONLY”
1 inch high letters, every 10 ft
valves for risers
“POTABLE WATER ONLY”
in 1/4 in letters. must be colored blue.
labeling requirements for sounding tubes
ID plate
cap will be dark blue
labeling requirements for potable water hose lockers
“POTABLE WATER HOSE”
how long should you flush pier side potable water
15-30 seconds
cleaning procedures for outlet and rinse fitting for ship to shore procedures
solution containing 100 ppm FAC, 2 min
purpose of halogen residual (chlorine/bromine) potable water testing
quick indication of water that may have been improperly treated or handled
wat does absence of halogen in the ships potable water indicate
contamination
two purposes of bacteriological testing
ensure fitness for human consumption and to assess adequacy of disinfection process.
why are Naval vessels exempt from chemical analysis
chemical analysis is complex. if assistance is required notify nearest NEPMU
who checks the temperature and pH of the potable water
engineering dept. halogenation is more effective at warm temperatures
why is salinity not tested on halogenated water
false results
how much halogen residual of FAC and TABR must surface ships maintain in the potable water system after initial treatment
.2 ppm FAC or TABR
if water is received from a doubtful quality, halogen residual at point of consumption must be a minimum of what ppm FAC?
2 ppm FAC
how often is halogen residual checked by MDR?
daily
in conjunction with bacterial analysis
prior to receipt of potable water
who is responsible for checking the halogen level of the potable water tanks after a 30 min contact time
engineering dept
who do we follow for established Maximum Container Level (/MCL) for coliform bacteria?
EPA established MCL
what is the frequency of Micro monitoring
weekly according to a written plan
what is the number of weekly site samples for micro?
population dependent.
<400 personnel, 4
400-800 personnel, 8
>800 personnel, 12
what is included in the bacterial monitoring that is done weekly
1/4 of ice machines, 1/4 of the water tanks
two approved methods of bacteria testing
colilert and Colisure
if a positive bacterial monitoring result, how many samples must be repeated?
3.
one at original connection, upstream, and downstream, no more than 5 connections either way
within how many hours will you collect repeats after a positive sample
24 hrs
what does DPD#1 test for
FAC or TBR
what does DPD #4 test for
total chlorine residual
accuracy of the Color comparator
(+) or (-) 10 percent
accuracy of the Portable Spectronphotometer
(+) or (-) 2 percent
what goes on the sample bottle or bag for bacteriological testing
location
date and time
samplers initials
how long does the bacteria samples incubate?
24 hrs at 35 C
reading results for colilert test
clear is negative
yellow is + for coliform
fluorescent (under UV) is + for fecal coliform
reading results f or colisure
yellow is negative
magenta is positive for total coliforms
fluorescent light blue is positive for E coli
where should you record results of the bacteriological testing
record result in the potable water log and/or TMIP including the positive and negative controls
what are the methods of disinfecting water
in-line chlorinators
brominator
recirculation brominator
batch method
in line (proportioning) brominator ppm delivery
.7 ppm bromine during nomal ops
can deliver 2.0 ppm when needed
what is the chlorine dosage rule of thumb for batch method
one ounce of HTH per 5,000 gallons of water = 1.0 ppm FAC
halogen residuals from approve source
.2 ppm FAC/BTR after 30 min
halogen residual from unapproved source
2.0 ppm FAC/TBR after 30 min contact time
if the ships brominator cannot achieve a TBR of 2.0 ppm the water must be chlorinated by what method
“Batch Method”
two methods to try to identify source and odor problem of water
chlorination method
steam method
what is the chlorination method of water for fixing taste and odor problems
1) chlorinate to 5.0 FAC
2) distribute at 2.0 PPM FAC
what is the steam method of fixing odor and taste problems
need NAVSEASYSCOM approval
boil the water for one minute to see if it works.
sequence of events when requesting outside help
contact NEPMU via TYCOM Medical Officer
if problem involves tank coatings, or cant be resolved notify NAVSEASYCOM via chain.
a) includes Naval Sea Support Center (NAVSEACEN) or In Service Engineering Agent (ISEA)
how many holes are in the metal box that holds Calcium Hypochlorite (HTH) 65%-70% for ready use stock
three 1/4 inch holes drilled in the bottom to allow release of chlorine gas
how much HTH supply shall be maintained in ready use stock
no more than 7 day supply
ideal storage space for HTH ready use stock
engineering office space
areas where ready use stock HTH box must NOT be installed
machinery space flammable liquid storeroom berthing paint storeroom oil and water test labs
some rules for storeroom stocks of HTH
located where temp will not exceed 100.
not adjacent to a magazine
5 feet away from any heat source or surface that exceeds 140 degrees F
no more than how many 6 ounce bottles in storeroom stocks
48
chapter of the NSTM that deals with bromine storage lockers
Chapter 533
shelf life of bromine cartridges
2 years from the date of manufacturer
how long does MDR maintain chronological record of potable water surveillance
2 years
disinfection methods 1 for potable water system afloat
fill tank
add chlorine to achieve 10ppm FAC, hold for 24 hrs.
refill
perform bacti
disinfection method two for potable water systems afloat
apply 200 ppm FAC to all surfaces
flush pipes with 10 ppm FAC
refill
perform bacti
method 3 of disinfecting potable watery systems afloat
fill 5% of tank with 50ppm FAC hold 6 hours. add potable water till full and hold 24 hrs. drain, refill perform bacti
