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

More documents

Recommendations

Info

the generator dielectrics. Sufficient drying to maximum dew point of -60° C (-76 degrees ° F) must be provided at the end of the drying cycleb. Drying for high pressure systems may be accomplished using heatlessdesiccant dryers only. For low pressure system, a refrigeration air dryerin series with heat-reactivated desiccant dryer shall be used.c. A refrigeration dryer capable of reducing inlet air temperature to 4° C(40° F) shall be provided for low pressure air preparation systems. Thedryer can be of the compressed refrigerant type or chilled water type.d. For heat-reactivated desiccant dryers, the unit shall contain twodesiccant filled towers complete with pressure relief valves, two fourwayvalves and a heater. In addition, external type dryers shall have acooler unit and blowers. The size of the unit shall be such that thespecified dew point will be achieved during a minimum adsorption styletime of 16 hours while operating at the maximum expected moistureloading conditions.e. Multiple air dryers shall be provided so that the ozone generation is notinterrupted in the event of dryer breakdown.g. Each dryer shall be capable of venting “dry” gas to the atmosphere, priorto the ozone generator, to allow start-up when other dryers are “on-line.”5.6.3. Air Filters.a. Air filters shall be provided on the suction side of the air compressors,between the air compressors and the dryers and between the dryers andthe ozone generators.b. The filter before the desiccant dryers shall be of the coalescing type andbe capable of removing aerosol and particulate larger than 0.3 micronsin diameter. The filter after the desiccant dryer shall be of theparticulate type and be capable of removing all particulate greater than0.1 microns in diameter, or smaller if specified by the generatormanufacturer.5.6.4. Air Preparation Piping.Piping in the air preparation system can be common grade steel, seamlesscopper, stainless steel or galvanized steel. The piping must be designed towithstand the maximum pressures in the air preparation system.Aug. 29, 2003Page 122
Chapter 6 -- Minimum Construction Requirements forPumping Facilities6.0 GeneralThis section applies to community water systems that construct or make majormodifications to pumping facilities.6.01. National Standards.a. Unless otherwise noted in this document, design and construction of thefollowing components shall be in accordance with the latest edition of theAmerican Water Works Association (AWWA) Standards:1. AWWA Standard E101 for Vertical Turbine Pumps-Line Shaft andSubmersible Types;2. AWWA Standard C500 for Metal Seated Gate Valves for WaterSupply Service;3. AWWA Standard C509 for Resilient Seated Gate Valves for WaterSupply Service;4. AWWA Standard C504 for Rubber Seated Butterfly Valves;5. AWWA Standard C507 for Ball Valves 6-inch Through 48-inch;6. AWWA Standard C508 for Swing-Check Valves for Water WorksService 2-inch Through 24-inch;7. AWWA Standard C115 for Flanged Ductile Iron Pipe withDuctile-Iron or Gray-Iron Threaded Flanges;8. AWWA Standard C200 for Steel Water Pipe 6-inch and Larger;9. AWWA Standard C206 for Field Welding of Steel Water Pipe;10. AWWA Standard C207 for Steel Pipe Flanges for Water WorksServices Sizes 4-inch Through 144-inch; and11. AWWA Standard C220 for Stainless-Steel Pipe 4-inch and Larger.b. Centrifugal Pumps.Unless otherwise noted in this document, centrifugal pumps shall bedesigned and constructed in accordance with the latest Hydraulic InstituteStandards B73.1 (horizontal types) or B73.2 (vertical types), except thatthe following requirements shall be observed:1. Larger stuffing boxes for mechanical seals shall be used;2. Solid Shafts shall be used for close coupled, end suction,horizontal centrifugal pumps to eliminate bending motion causedby the impeller; and3. Close coupled, end suction, horizontal centrifugal pumps shouldnot be used if the L 3 /D 4 ratio is greater than 60 where L is shaftlength and D is shaft diameter.c. Electrical Equipment.Unless otherwise noted in this document, design and construction of allelectrical equipment and all wiring associated with pumping facilities shallbe in accordance with the latest NFPA 70 National Electric CodeAug. 29, 2003Page 123
Page 1:
Design GuideforCommunity Water Syst
Page 4 and 5:
2.18. AUTOMATION. .................
Page 6 and 7:
4.3.11. Waste Disposal. ...........
Page 8:
CHAPTER 6 -- MINIMUM CONSTRUCTION R
Page 12 and 13:
Maximum Hour Demand -- The amount o
Page 14 and 15:
(This page is intentionally blank.)
Page 16 and 17:
and deviations are subject to indiv
Page 18 and 19:
(blank)Aug. 29, 2003Page viii
Page 20 and 21:
a. A description of the nature and
Page 22 and 23:
a. Hydrological data, stream flow,
Page 24 and 25:
4. Be conducted under the same oper
Page 26 and 27:
maintaining the new technology and
Page 28 and 29:
1.2.1. Plans shall include:a. Suita
Page 30 and 31:
name, number, effective date, publi
Page 32 and 33:
Page 34 and 35:
e. The site will provide all-weathe
Page 36 and 37:
chlorine residual by methods in "St
Page 38 and 39:
etween them, a six-inch band of con
Page 40:
Page 46 and 47:
a. Regulated recreational activitie
Page 48:
e done to determine the degree and
Page 51:
1. Pumping rate;2. Pumping water le
Page 55 and 56:
sieve analyses of the water bearing
Page 57 and 58:
e circulated in the annular space s
Page 59 and 60:
emoved. Therefore, every well shoul
Page 61 and 62:
3.2.6.4. Pitless well units.a. The
Page 63 and 64:
SIZE (inches)6 id.8101214 od.161820
Page 65 and 66:
Chapter 4 -- Tre atment4.0. General
Page 67 and 68:
settling basins shall be not less t
Page 69 and 70:
3. Shall have valves located outsid
Page 71:
d. Be automatic. Timers on automati
Page 76 and 77:
2. Uniformity coefficient not great
Page 78 and 79:
j. During air scour, the backwash w
Page 80 and 81:
. An easily readable meter or flow
Page 82 and 83:
4.3.4. Design Pressure Drop or Tran
Page 84 and 85:
4.3.9. Flow Meters.Totaling rate of
Page 86 and 87:
utilized, shall be 1.0 milligrams p
Page 88 and 89:
. Removal of precursors prior to ch
Page 90 and 91: 5. Consideration shall be given to
Page 92 and 93: . Pre-treatment requirements. Iron,
Page 94 and 95: t. Housing. Bagged salt and dry bul
Page 96 and 97: 4.7. Iron and Manganese ControlIron
Page 98 and 99: Where phosphate treatment is used,
Page 100 and 101: 3. Series and parallel flow piping
Page 102 and 103: approval of the department before u
Page 104 and 105: contact time must be provided to co
Page 106 and 107: a. Sanitary sewers with the approva
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
Page 124 and 125: outside atmosphere, above grade and
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 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
Page 148 and 149: 6.4.2.2. Suction lines.Suction line
Page 150 and 151: cessation of minimum essential serv
Page 152 and 153: parameters: average winter (Decembe
Page 154 and 155: a. Overflows shall be sized to perm
Page 156 and 157: additional shielding to prevent the
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
Page 168 and 169: in areas served by rural water dist
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
show all

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

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?