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104 Cards in this Set
- Front
- Back
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NAVMED P-5010
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Manual of Naval Preventive Medicine
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BUMEDINST 6240.10 Series |
Standards of Potable Water |
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SECNAVINST 5100.10 Series
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DON Policy for Safety, Mishap Prevention, Occ Health and Fire Protection Programs
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OPNAVINST 5100.19
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NAVOSH Program Manual for Forces Afloat |
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OPNAVINST 5100.23 |
Navy Safety and Occ Health Program Manual |
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What chapter of the NAVMED P-5010 deals with potable water testing? |
Chapter 6, Appendix B |
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A raised frame to keep out water |
coaming |
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The total process the distilling plant forms, including evaporation and condensation.
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Distillation |
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Chlorine available (after demand is met) in the forms of Hypchlorous acid and Hypochlorite irons |
Free Available Chlorine (FAC) |
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A unit of length. One millionth of a meter. |
Micron |
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A treatment device applied to a single tap used for the purpose of reducing contaminants in drinking water at that tap |
Point of Use (POU) |
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Water that is suitable for human consumption, bathing, laundry, personal hygiene
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Potable water |
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The reverse of the natural osmosis achieved by external application of sufficient reverse pressure to cause the solvent to flow in its unnatural direction. |
Reverse Osmosis (RO) |
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Test used to detect total coliform and E-coli in the potable water
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Colilert/Colisure |
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Are a group of closely related, mostly harmless bacteria that live in soil and water as well as the guts of animals. Can indicate the general quality of water and likelihood that water is fecally contaminated.
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Total Coliform
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A type of fecal coliform bacteria commonly found in the intestines of animals and humans. Presence in water is a strong indication of recent sewage or animal waste contamination. |
E. Coli
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What does E. Coli stand for?
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Escherichia coli |
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What entity is responsible for the shipboard potable water systems, including treatment facilities and processes to assure that safe drinking water is available at all times?
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NAVSEASYSCOM
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Who is responsible for design, construction, and maintenance in regards to potable water afloat? |
NAVSEASYSCOM
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What entity is 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.
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NAVFECENGCOM |
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What is the Chief, BUMED responsible for in regards to potable water afloat? |
-Establishing and promulgating health standards for water quality afloat -Promulgate appropriate instructions, notices, or other publications to reflate afloat water quality requirements -Establish shipboard requirements for medical surveillance of potable water systems |
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Who is responsible for issuing the necessary implementing directives to ensure that adequate water sanitation standards are provided and enforced in each ship within the command. |
Area, Fleet and subordinate commanders |
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Who is 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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Commanding Officers |
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Who is responsible to the CO for implementing the requirements of the NAVSEASYSCOM?
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Engineering Department |
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Who is responsible for ensuring that all ship-to-shore and ship-to-ship connections are made only by authorized personnel? |
Engineering Department |
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Who ensures 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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Engineering Department
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What is the MDR responsible for in regards to potable water afloat?
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1) BACTI testing 2) Daily Halogen Testing 3) Notify the CO of any discrepancies |
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What is the minimum usage requirements for potable water afloat? |
50 gallons per man per day (NAVSEA) Does not apply to "water hours" 1) Not less than 2 gallons per man per day 2) Particularly applicable to troop-carrying ships loaded beyond their water producing capacity |
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Avoid making water while operating in:
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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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US Military sources including establishments under the cognizance of:
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1) British Royal Navy 2) Canadian Forces 3) Royal Australian Navy 4) Other locations under NEPMU AOR |
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What are the types of water production plants?
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Distillation Plants and Reverse Osmosis |
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What are the 3 types of distillation plants? |
Steam Distilling Waste Heat Distilling Plant (Diesel) Vapor Compression Type (Electrical) |
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Explain Reverse Osmosis? |
Remove particles as small as 1 micron Filtered water pressures up to 1000 PSI, 20-25% becomes fresh water. |
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Difference between single and triple RO
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Single Pass - additional disinfection such as chlorination or bromination is required. Tripe Pass - Usually in submarine, addition disinfection is not required |
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Potable water tanks should NEVER be filled with? |
Ballast water, unless necessary for survival of ship |
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Potable water tank coating must meet what standard?
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NSF/ANSI standard
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This are located to reduce accidental contamination and have a screen with 18 gauge or finer, non-corrosive mesh.
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Vents and Overflows
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What are unauthorized termination points?
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1) Food service spaces 2) Medical spaces 3) Toilets 4) Electrical or electronic rooms 5) Exterior of the ship |
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If top of a water tank is also a deck, where is the manhole located?
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1/2" curb or combing above the deck |
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What are the types of water level measurement tools?
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Automatic level gauge Petcocks Sounding tubes (rods stay in tubes) - if steel tape used, disinfect at 100ppm FAC for 2 min prior to use. - Must be labeled "POTABLE WATER USE ONLY" |
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Describe filling connections
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18 inches from the deck Turned facing downward Screw caps with keeper chains |
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Filling lines must never cross connected with?
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Any non-potable piping or system
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Portable water piping passing through non-potable water tankls must have the pope surrounded by?
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A sloped self-draining pipe tunnel |
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Potable hot water settings should be set so the temperature at the fixture is? |
120 F at the tap |
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Potable water filling lines which distribute potable water to non-potable water tanks must have what?
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an air gap or backflow prevention device
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Potable water hoses must be clearly labeled how?
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"POTABLE WATER ONLY" with 2 inch high letters every 10 feet. Couplings colored dark blue |
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Valves for receiving or supplying portable water should be clearly labeled how?
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"POTABLE WATER ONLY" in 1/4 inch high letters |
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When should halogen be tested during the transfer of water? |
Prior to the initial transfer |
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What are the halogen residual values for potable water? |
If under 0.2 ppm, ship must boost halogen residual to the appropriate level.
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Engineering will notify who prior to making potable water hose connections.
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MDR, who will test halogen residual and make recommendation to engineering dept.
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Minimum halogen residual requirements for water with doubtful quality is?
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2.0 PPM
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What is the process for transferring potable water from ship-to-shore?
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1) Remove SHORE cap and flush 15-30 sec 2) Immerse outlet and rinse fitting in 100 ppm FAC solution for at least 2 min. 3) Flush water to waste for 15-30 sec 4) Connect hose to pier side outlet and flush 5) connect hose to shipboard riser and deliver potable water 6) When complete, secure shore water source and remove ship connection first, then shore. |
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What is the purpose of halogen residual testing? (Chlorine/Bromine) |
Absence of Halogen in the ship's potable water may indicate contamination. |
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What is the purpose of bacteriological testing?
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Ensures fitness for human consumption and to assess adequacy of disinfection process |
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Who publishes the "Standard Methods for the Examination of Water and Wastewater"?
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American Public Health Association (APHA) American Water Works Association (AWWA) Water Pollution Control Federation (WPCF) |
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If you need assistance in potable water testing requirements, who should you contact?
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NEPMU
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Temperature/pH is routinely performed by who?
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Engineering Department
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Halogenation is more effective at what temperatures? |
Lower water temperatures
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Chloride shall not exceed what levels?
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0.065 Equivalent per Million or 2.3 ppm
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Why must salinity testing never be conducted on halogenated water?
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Halogenated water will provide false results
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Ships with large potable water distribution systems, such as aircraft carriers, shall maintain at least _____ level of chlorine in the distal ends of the distribution systems.
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Trace
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What is the frequency of monitoring for microbiological quality?
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400 personnel or less - no less than 4 samples 401-800 personnel, - 8 samples >800 personnel - 12 1/4 of ice and potable water tanks |
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Emergency potable water tanks will be test how often for microbiological quality? |
Monthly
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Each positive sample for microbiological testing will require what?
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3 repeat test samples. Original, upstream & downstream (no more than 5 connections away) |
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What does DPD #1 test for?
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FAC or TBR
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What does DPD #2 test for? |
chloramines (total chlorine) residual |
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Halogen testing can be accomplished using what?
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Color comparator or Portable Spectrophotometer
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What is the accuracy range of a color comparator?
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+/- 10%
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What is the accuracy range of a portable spectrophotometer?
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+/- 2% |
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Test tubes should be filled with how much tap water?
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10ml
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How long after tablets have dissolved in a test tube, should it be compared with the comparator?
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Within 60 seconds
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How often should bacteriological testing be conducted?
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Weekly
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What are the shipboard EPA approved methods for bacteriological testing?
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Colilert Colisure |
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How long should you incubate samples for bacterial testing and at what temp?
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24hrs at 35C
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Samples should be placed under __ nm UV lamp
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365
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Colilert color readings
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Yellow - Pos for total coliform Fluoro yellow (under UV) - Pos fecal coliform |
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Colisure color readings |
Yellow - Neg Magenta - Pos Total Coliforms Fluoro light blue - Post E. Coli |
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When collecting water samples, how much (ml) should you collect in a bottle/bag containing sodium thiosulfate?
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100 ml
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If you water source is contaminated, where is it likely to have come from?
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Cross connections with non-potable systems Leaks in common bulkheads between potable water tanks and fuel tanks, ballast tanks, bilges, and wastewater tanks. |
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This type of automatic chlorine disinfection injects hypochlorite into system in proportion to the flow of water.
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In-line Chlorinators
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What are the two types of brominators.
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In-line and recirculation
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In-line brominator is preset to deliver ___ ppm bromine to water during normal operating procedures but can deliver 2.0 ppm when necessary.
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0.7
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What is the least desirable method of water disinfection?
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Manual chlorine disinfection (Batch Method) As it may result in over-chlorination |
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What is the disinfection of choice for manual chlorine disinfection? |
Calcium Hypochlorite (HTH)
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HTH comes in what strengths?
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65-70%
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Sodium Hypochlorite (bleach) comes in what strengths?
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5-10%
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What is the chlorine dosage rule of thumb?
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One oz HTH per 5,000 gallons of water = 1.0 ppm FAC
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What are the required halogen residuals used for disinfection of potable water afloat? |
Approved source: 0.2 ppm FAC/TBR after 30 min contact time Unapproved source: 2.0 ppm FAC/TBR after 30 min contact time |
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How long must the solution be held in method 1 of disinfecting a potable water system?
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24hrs
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What is the second step in method 2 of disinfecting a potable water system?
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Flush inlet/outlet pipes with 10ppm FAC
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Explain how you fill and how long you hold the solution for method 3 of disinfecting a potable water system.
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- Fill 5% of tank volume with 50 ppm FAC solution and hold for 6 hours. Then add potable water to fill tank and hold for 14 hrs. |
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If the source of taste and odor problem cannot be identified used the following methods
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Steam method Or request NEPMU via TYCOM Med Officer |
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HTH comes in what size bottles?
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6 oz
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HTH storage is preferably found in what spaces?
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Engineering office
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How should you store HTH? |
In a metal box with 3 1/4" holes drilled in the bottom |
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Where can HTH NOT be stored at? |
Machinery space Flammable liquid storeroom Berthing space Paint storeroom Oil and water test lab areas |
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No more than a ___ day supply of HTH shall be maintained in ready use stock at any time. |
7 |
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HTH should not stored in a location where the maximum temperature will not exceed _____ and not be subjected to condensations or water accumulation |
100F |
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No more than ___ six oz bottle of HTH shall be stored in any individual locker or bin |
48 |
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The HTH locker should not be adjacent to a magazine and should be located at least 5 feet away from any heat source which may exceed? |
140 degrees F |
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All lockers containing HTH shall be labeled with? |
"Hazardous material, calcium hypochlorite" on red letters with a white background |
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Bromine cartridges have a shelf life of ____ |
2 years from date of manufacture |
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What approves the water sanitation bill? |
The CO |
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Who will maintain a chronological record of potable water surveillance and for how long? |
MDR 2 years |
