1、- A-A-50573 74 0374544 77T INCH-POUND A-A-50573 Aril21. 1997 SUPERSEDING 30August 1991 MIL-W- 17 122D COMMERCIAL ITEM DESCRIPTION WATER SOFTENER UNIT, LIME-SODA TYPE The General Services Administration has authorized the use of this commercial item description for ail Federal agencies. 1. SCOPE. Thi
2、s commercial item description (CID) covers water softening equipment for process and boiler feed water treatment using lime or soda ash. Both hot process and cold process equipment are covered. 2. CLASSIFICATION. Water softeners are of the following types, as specified (see 7.1 and 7.3). 2.1 Type: T
3、ype I Type II - Hot process, lime-soda - Cold process, lime-soda 2.2 Capacity: Class 1 Class 2 Class 3 - Under 5,000 galions per hour (ah) (Under 5 250 cubic centimetre per second (cm3/s) - 5,000 to 7,000 gph (5 250 to 7 350 cm3/s) - 7,000 to 10,000 gph (7 350 to 10 500 cm3/s) Beneficial comments, r
4、ecommendations, additions, deletions, clarifications, etc. and any data which may improve this document should be sent to: Commanding Officer (Code 15E2), Naval Construction Battalion Center, 1000 23rd Avenue, Port Hueneme, CA 93043-4301, by using the Standardization Document Improvement. Proposal (
5、DD Form 1426) appearing at the end of this document or by letter. AMSC NIA FSC 4610 Licensed by Information Handling ServicesA-8-50573 H 9999974 0374545 bob = A-A-50573 3. SALfrn CHARACTERISTICS. 3.1 Description Water softeners covered by this CID shall be designed to treat boiler feed water or proc
6、ess water in self-contained units. The softening process shall include the use of lime and soda ash. Provisions shd be made for the addition of a chemical feeder for coagulant, phosphates, and sulfuric acid. Supplementary treatment with phosphates and sulfuric acid, if necessary in order to meet eff
7、luent requirements, shd be included. The equipment shall be complete and ready for service with all interconnection piping, fittings, valves, and control lines. The equipment shall include principally the softener tank with or without heating chamber, settling tank and, ifrequired, a deaerator (see
8、3.6 and 7.3), and ali connections, the control systems, the chemical feeders and the filters. 3.2 Standard commercial product. The water softening equipment shall, as a minimum, be in accordance with the requirements of this CID and shall be the manufacturers standard commercial product. Additional
9、or better features which are not specifically prohibited by this CID but which are a part of the manufacturers standard commercial product, shall be included in the water softening equipment being furnished. A standard commercial product is a product which has been sold or is being currently offered
10、 for sale on the commercial market through advertisement or manufacturers catalogs or brochures, and represents the latest production model. 3.3 Performance. The water softener equipment shall be capable of meeting the capacities specified.(see 2.) The tank interiors shall be provided with aii ofthe
11、 necessary baffles, cylinders, partitions or tubes required for the satisfactory performance of the equipment. Unless otherwise specified (see 7.3), the treated water shall have hardness of less than 1.50 grains per gallon (25.68 milligrams per litre (mg/L) in terms of calcium carbonate (CaCO3) for
12、type I, and less than 3 grains per gallon (5 1.36 mgL) for type II, with an excess soda ash content of less than 2.00 grains per gallon (34.24 ma). 3.4 Components for tpe I. 3.4.1 Softener tanks. The softener tank shall conform to MME Boiler and Pressure Vessel Code, Section VIII, Division 1. The ta
13、nk shall be of the sludge blanket or solids contact type as specified (see 7.3) and meet the design pressure specified (see 7.3). Softeners equipped for deaerating and heating returned condensate shall be so designed that oniy raw or makeup water shall pass through the softening section and the filt
14、ers. 3.4.2 Settling tanks. The settling tanks shall be huge enough to provide one-hour retention when the units are working at rated capacity. The rise rate based on the outlet service flow shall be not greater than 2.3 gallons per minute (gpm) per square foot (fi2) (O. 15 litre per second &/s) per
15、square metre (m). The flow rate through the softener shall be low enough so that a filter can be backwashed at the specified rate continuously for 10 minutes without any carryover of the slurry fiom the softener to the filter. The conical bottom shal have SuniCient slope as to ailow for sludge remov
16、al. 2 Licensed by Information Handling ServicesA-A-50573 = 9999974 0374546 542 A-A-50573 3.4.3 Tank connections. The tank shall have ail the connections necessary for the satisfactory operation of the equipment including the following: a. b. d. e. f. g. h. C. I. i k. 1. m. n. O. Internal direct cont
17、act vent condenser Makeup inlet Vacuum breaker Chemical inlet Recirculation inlet Sludge drain Treated water outlet Overflow Clean backwash fiil Dirty backwash return Sample connections Pressure and temperature connections Vent and access manways for access to upper chemical reaction zone Lower sett
18、ling zone Backwash compartments 3.4.4 Spray valves. Heating the makeup water shall be accomplished by use of self-regulating, nonfouling spray valves. The spray valves shaii be accessible fiom outside of the pressure vessel through removable cover plates. The spray valves shaii provide a constant an
19、gle of thin fiim spray with uniform water film at rates from 3 percent to 120 percent of rated system design capacity. The pressure drop required for the spray valves shail be kept to a minimum to effect complete and uniform spraying at fli flow when the water is heated to within 2 degrees Fahrenhei
20、t (OF) (I. 1 degrees Celsius (OC) of saturation temperature maintained by heating steam in process vessel. 3.4.5 Vent condensers. Provisions shaii be made for complete venting of ail released noncondensable gases, including oxygen, carbon dioxide, and nitrogen using supply vent condensers of the dir
21、ect contact internal type, using makeup water as the cooling fluid, with a minimum of steam loss. 3.4.6 Vacuum breakers. Tanks shall be equipped with vacuum breakers of adequate size. Sheils less than 10 feet (3 metre (m) in diameter may have oniy a singie port, not smaller than the siie given below
22、. The vacuum breakers shali seal tight against steam pressure and open to relieve vacuum before the tanks are in danger of collapsing. Type I softeners Breaker nominal pipe size Class 1 Class 2 Class 3 One 6-inch (150 mm) breaker One 10-inch (250 mm) breaker One 16-inch (410 mm) breaker 3 Licensed b
23、y Information Handling ServicesA-A-50573 H 9999974 0374547 489 H A-A-50573 3.5 Components for type II. 3.5.1 Softener tanks. Tanks shall be designed for field assembly and be of the solids-contact, sludge recirculation type units. Tanks shall be large enough to provide one-hour retention of water be
24、ing treated when operating at rated capacity. The takeoff rate shall be not greater than 1.5 gpm per fi2 (0.09 Ws per m2) of surface area. 3.5.2 Tank connections. Connections shall be provided for the water inlet, the outlet, sludge removal, sampling pipes, and bottom drain. Ail necessary pipe and f
25、ittings associated with the connections sutcient to bring the piping to points 6 inches (152 millimetre (mm) beyond the surface of the equipment, shall be supplied. 3.5.3 Tank mixing zone. Type II tanks shall have a mixing zone, separated fiom the rest of the tank, where the raw water chemicals shal
26、l be thoroughly mixed by mechanical or hydraulic agitation. The sludge-recirculation, solids contact unit shd provide for flash mixing, sludge recirculation, flocculation setting, and clarification within a singie basin. 3.5.4 Effluent removal trough. An effluent removal trough shall be provided to
27、receive the softened effluent from the softener tank. 3.6 Accessory components for type I and type II. When specited (see 7.3) accessory components designed to supplement the operation of he soda ash softener systems shall consist Of: a. Deaerator. When used with type I hot lime softener, deaerator
28、shall be fiirnished as an integral part of softener tank designed to receive 100 percent makeup or varying percentages of makeup and condensate as required to support boiler feed requirements. When furnished with type II lime soda softener, deaerator shall be furnished as a separate pressure vessel
29、being designed for 100 percent makeup or makeup and condensate returns. Deaerator systems shall be furnished with automatic water level control valves, overflow valves, level alarms, pressure, temperature indicators, pressure and vacuum relief valves. b. Chemical feed system for lime and soda ash. T
30、he system shall consist of an electrically agitated lime slurry storage tank with depth gauge and low level aim. It shail be fitted with a centrifugal transfer pump complete with recirculation valve, automatic inlet valve, lime softener makeup water meter. The system shall have an electromechanical
31、or process logic control (PLC) design control station to inject chemical in proportion to raw water entering softener system. c. Automatic desludge system. A pneumatically actuated sludge removal valve with electromechanical or PLC design control loop, designed to effect valve opening (sludge remova
32、l) fiom base of softener by gravity drain for a timed duration. Valve opening will occur based upon volume of makeup water supplied to softener tank as registered by the inlet water meter. Licensed by Information Handling ServicesA-A-50573 D 9999974 0174548 315 A-A-50573 3.6.1 Electric motors. Unles
33、s otherwise specied (see 7.3), the motors shall be 208-volt, . 3-phase, 60-cycle, totally enclosed, class A insulation motors equipped with thermal overload elements, The motors shall be the manufacturers recommended size for the power requirements. The motor temperature rise shall be not greater th
34、an 13 1 OF (55 OC) when operated at full load in an ambient temperature of 104 OF (40C). The motors shall conform to NEMA MG 1. 3.6.2 Acidic resistant components. Ifthe water in which the impeller and components operate is acidic, such parts shall be made of or coated with corrosion-resistant materi
35、ais. Tanks for acidic solutions shall be of plastic, such as polyvinyl chloride for plastic lined steel, or lead lined steel, in accordance with manufacturers standard practices. 3.7 Testing atiparatus. When specified (see 7.3), the manufacturer shall supply, for each installation, a chemical testin
36、g outfit, (including a supply of testing chemicals), the test apparatus, report forms, and a cabinet to contain all of the equipment. The apparatus shall permit making a quantitative analysis of the following constituents in the treated and concentrated boiler water: a. Alkalinity. b. Sodium chlorid
37、e. c. Hardness. d. Phosphate (boiler concentrate oniy), O to 100 parts per million (ppm). e. Dissolved oxygen. The tests shall be the accepted standard laboratory tests and the equipment shall be in accordance with good commercial practice. 3.8 Drawings and technical publications. When specified (se
38、e 7.3), the mandacturer shaU submit installation drawings and shail frnish operating instruction manuais with lubrication chart, parts book, and repair manuals applicable to the equipment and attachments with each unit being supplied. 3.9 Repair or maintenance parts. maintenance tools. and accessori
39、es. When specified (see 7.3), repair or maintenance parts, maintenance tools, and accessories shall be furnished applicable to the units being supplied. 4. REGULATORY REQUIREMENTS. 4.1 Materials. The offeror/contractor is encouraged to use recovered materials to the maximum extent practicable, in ac
40、cordance with paragraph 23.403 of the Federai Acquisition Regulation (FAR). produced fiom recovered materials to the maximum extent possible without jeopardizing the intended use. The term “recovered materials” means materiais which have been collected or Unless othewise specified herein, all equipm
41、ent, material, and articles incorporated in the work covered by this commercial item description are to be new and fabricated using materiais recovered from solid waste and reprocessed to become a source of raw materiais, as opposed to virgin raw materiais. Unless othenvise specified, none of the ab
42、ove sha be interpreted to mean that the use of used or rebuilt products are allowed under this commercial item description. 5 Licensed by Information Handling ServicesA-A-50573 4.2 Metric products. Products manufactured to metric dimensions will be considered on an equal basis with those manufacture
43、d using inch-pound units, provided they faii within the specified tolerances using conversion tables contained in the latest version of ASTM E 380, and all other requirements of this commercial item description including form, fit, and function are met. ifa product is manufactured to metric dimensio
44、ns and those dimensions exceed the tolerances specified in the inch-pound units, a request should be made to the contracting officer to determine if the product is acceptable. The contracting officer has the option of accepting or rejecting the product. 5. QUALITY ASSURANCE PROVISIONS, 5.1 Product c
45、onformance. The products provided shali meet the salient Characteristics of this commercial item description, conform to the producers own drawings, specifications, standards, and quality assurance practices, and be the same product offered for sale in the commercial market. The government reserves
46、the right to require proof of such conformance. 6. PACKAGING. The preservation, packing, and marking shaii be as specified in the contract or order. 7. NOTES. 7.1 Part Identification Number (PIN) . The foliowing part identitication numbering procedure is for government purposes and does not constitu
47、te a requirement for the contractor. The PINS to be used for items acquired to this description are created as follows: AA50 573 -X-X CID number Type (see 7.1.1) 7.1.1 Type. The type of water softeners shall be identified by a two-digit identifier shown in table I. TABLE I. Type identifier. Identifi
48、er Class Nominal piDe size Type I 1 -A Class 1 One 6-inch (1 50 mm) breaker 1 -B Class 2. One 10-inch (250 mm) breaker 1-c One 1 6-inch (4 1 O mm) breaker Type II 2-A 6 Licensed by Information Handling Services A-A-5057 3 m 9999974 0174550 T73 A-A-5 05 73 I 7.2 Source of documents. 7.2.1 Copies of s
49、pecifications and standards required by suppliers in connection with specific procurement fiinctions should be obtained fiom the procuring activity or as directed by the contracting officer. 7.2.2 ASME Boiler and Pressure Vessel Code is available from the American Society of Mechanical Engineers, United Engineering Center, 345 East 47th Street, New York, NY 10017. 7.2.3 NEMA Standards are available from the National Electrical Manufacturers Association, 1300 North 17th Street, Suite 1847, Rosslyn, VA 22209. 7.2.4 ASTM Standards are available from the Ame
