Design Guide for Community Water Systems - The Water, Sanitation ...

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6.4.2.2. Suction lines.Suction lines should be buried but shall be protected from freezingtemperatures if not buried.6.4.3. Inline booster pumpsInline booster pumps are pumps that do not draw water directly from storage.a. Distribution systems with inline booster pumps shall not cause mainpressures to drop below 20 psig in any part of the system delivering water tothe booster station.b. All pumps shall be accessible for servicing and shall be valved and piped sothat each pump can be isolated and removed with the remaining pumps inservice.6.4.4. Individual home booster pumpsIndividual home booster pumps shall not be allowed for any individual servicefrom the public water supply mains unless approved by the department. Approvalwill generally be considered only for temporary service until properly designeddistribution system improvements can be made to eliminate the low pressure area.6.4.5. Automatic stationsAll automatic stations should be provided with automatic signaling apparatus thatwill report when the station is out of service. All remote-controlled stations shallbe electrically operated and controlled and shall have signaling apparatus ofproven performance.6.5. Appurtenances.6.5.1. Valves.a. Pumps shall be adequately valved to permit satisfactory operation,maintenance, and repair of the equipment. If foot valves are necessary,they shall have a net valve area of at least 2½ times the area of thesuction pipe and they shall be screened. Each pump shall have a positiveactingcheck valve on the discharge side between the pump and the shutoffvalve.b. Pressure control valves shall be required for reducing water hammer orsurges that equal or exceed 30 pounds per square inch and shall berequired if the surge results in pressure below 20 pounds per square inchgage anywhere in the distribution system.6.5.2. Piping.In general, piping shall:a. Be designed so that the friction losses will be minimized;Aug. 29, 2003Page 130
. Not be subject to contamination;c. Have watertight joints;d. Be protected against surge or water hammer;e. Be such that each pump has an individual suction line or that thelines shall be so manifolded that they will ensure similar hydraulicand operating conditions;f. Be equipped with a hose bib for cleaning; andg. Be equipped with smooth-nose sampling taps constructed of brass,bronze, or stainless steel on both the suction and discharge.6.5.3. Gauges and meters.Each pump:a. Shall have a standard pressure gauge on its discharge line;b. Shall have a compound gauge on its suction line;c. Shall have recording gauges in the stations with capacities of 0.5million gallons per day (MGD) or larger; andd. Should have a totaling time of operation meter.6.5.4. Water Seals.a. Water seals shall not be supplied with water of a lesser sanitaryquality than that of the water being pumped.b. Where pumps are sealed with potable water and are pumping waterof lesser sanitary quality, the seal shall:1. Be provided with a break tank open to atmospheric pressure;2. Have an air gap of at least one inch or two pipe diameters,whichever is greater, between the feeder line and the spill lineof the tank; or3. Provided with a reduced pressure principle backflowprevention assembly.6.5.5. Controls.Pumps, their prime movers, and accessories, shall be controlled in such amanner that they will operate at rated capacity without dangerousoverload. Where two or more pumps are installed, provision shall bemade for alternating pumps. Provision shall be made to preventenergizing the motor in the event of a backspin cycle. Electrical controlsshall be located above grade.6.5.6. Power.For their own protection, all water systems should make an arrangementfor back-up power. Systems serving a population of 3,300 or more shallmake arrangements for back-up power, and include these arrangements intheir emergency operating plan. When power failure would result inAug. 29, 2003Page 131
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Design GuideforCommunity Water Syst
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2.18. AUTOMATION. .................
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4.3.11. Waste Disposal. ...........
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CHAPTER 6 -- MINIMUM CONSTRUCTION R
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Maximum Hour Demand -- The amount o
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and deviations are subject to indiv
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(blank)Aug. 29, 2003Page viii
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a. A description of the nature and
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a. Hydrological data, stream flow,
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4. Be conducted under the same oper
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maintaining the new technology and
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1.2.1. Plans shall include:a. Suita
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name, number, effective date, publi
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e. The site will provide all-weathe
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chlorine residual by methods in "St
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etween them, a six-inch band of con
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a. Regulated recreational activitie
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e done to determine the degree and
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1. Pumping rate;2. Pumping water le
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sieve analyses of the water bearing
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e circulated in the annular space s
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emoved. Therefore, every well shoul
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3.2.6.4. Pitless well units.a. The
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SIZE (inches)6 id.8101214 od.161820
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Chapter 4 -- Tre atment4.0. General
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settling basins shall be not less t
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3. Shall have valves located outsid
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d. Be automatic. Timers on automati
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2. Uniformity coefficient not great
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j. During air scour, the backwash w
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. An easily readable meter or flow
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4.3.4. Design Pressure Drop or Tran
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4.3.9. Flow Meters.Totaling rate of
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utilized, shall be 1.0 milligrams p
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. Removal of precursors prior to ch
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5. Consideration shall be given to
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. Pre-treatment requirements. Iron,
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t. Housing. Bagged salt and dry bul
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4.7. Iron and Manganese ControlIron
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Page 100 and 101: 3. Series and parallel flow piping
Page 102 and 103: approval of the department before u
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Page 108 and 109: 1. Obtain a letter of approval from
Page 110 and 111: 6. The provisions for the final dis
Page 112 and 113: a. Missouri River or Mississippi Ri
Page 114 and 115: 5.0.3. General equipment design.Gen
Page 116 and 117: minimize chemical dust created by t
Page 118 and 119: 1. At least 30 days of chemical sup
Page 120 and 121: e. Hand pumps shall be provided for
Page 122 and 123: 5.2. Chemicals.5.2.1 Shipping conta
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Page 126 and 127: 5.4.2. Acids.a. Acids shall be kept
Page 128 and 129: 4. Anhydrous ammonia contact with c
Page 130 and 131: combustible material.2. Powdered ac
Page 132 and 133: fluoride feed line when a metering
Page 134 and 135: possibility for overfeed.h. Protect
Page 136 and 137: caution.d. Where taste and odor con
Page 138 and 139: e installed to monitor the flow of
Page 140 and 141: the generator dielectrics. Sufficie
Page 142 and 143: published by the National Fire Prot
Page 144 and 145: g. Water from pump gland drainage s
Page 146 and 147: 6.3. Pumps.6.3.1.Pumps shall be siz
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Page 152 and 153: parameters: average winter (Decembe
Page 154 and 155: a. Overflows shall be sized to perm
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Page 158 and 159: largest pump out of service shall b
Page 160 and 161: 7.1.4. CostsAs part of the final en
Page 162 and 163: 7.4. Hydropneumatic Storage7.4.1. H
Page 164 and 165: provided on larger tanks as needed
Page 166 and 167: 7.5.2. Fire Suppression Rating Sche
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Page 170 and 171: connected directly to any sewer. Su
Page 172 and 173: 8.6.5. Force mains.There shall be a
Page 174: 8.11.2. Filling device.A filling de
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