1、MIL- G- 197 20 (SHIPS) 11 December 1956 hq1LITARY SPECIFICATION GENERATOR SET, STEAM TURBINE 500-KW, 450-VOLT, 60-CYCLE A. C. 1. SCOPE 1.1 This specification covers 500-kw., 450-volt, 60-cycle alternating cur- rent (a. c.) steam turbine generator sets for Naval shipboard use. 2. APPLICABLE DOCUMENTS
2、 2.1 The following specifications, standards and drawings, of the issue in effect on date of invitation for bids, forrri a part of this specification: SPECIFICATIONS FEDERAL NN-B-591 - Boxes, Fhrboard, Wood-Cleated (for DornestidSbipment). LLL-B-631 - Bbires, Fidber Corrugated (for Domestic Shipment
3、), LLL-B-636 - Boxes, Fiber Solid (foi: D4msFi.a Shipment). PPE-B-585 - Boxes, Wood, Wirebound., PPP- B-60 1 - Boxes, Wood, Cleated- Ply wood. PPP-B-621 - Boxes, Wood, Nailed and Lock-Corner. MILITARY MIL-E-1 - Electron Tubes and Crystal Rectifiers. JAN-P-103 - Packging and Packing for Overseas Ship
4、ment - JAN-P-104 - Packaging and Packing for Overseas Shipment - JAN-P-108 - Packaging and Packing for Overseas Shipment Boxes; Wood Cleated; Solid Fiberboard. Crates, Sheathed, Wood, Nailed. Boxes, Fiberboard (V-Board and W-Board), E xte r ior and Inter io r . MIL-P- 116 - Preservation, lM Having R
5、otating E arts (Includes Associated Repair Parts). MIL-M- 17059 - Motors, Alternating-Current, Fractional HP (Shipboard Use). MIL-T-17244 - Thermometer, Self-Indicating, Bimetallic. MIL-P- 17286 - Preservation, Packkging, Packing, and Marking of Propulsion and Auxiliary Steam Turbines and Gears and
6、Associated Repair Parts, MIL-F-17292 - Format for List of Repair (Spare) Parts for Ship- board Mechanical and Electrical Equipment. MIL-T-17523 - Turbine, Steam, General Auxiliary (Naval Ship- board Use). MLL-P- 17652 - Preparation for Delivery of Electronic, Electrical, and E lec tr o - Mec hanical
7、 Par.ts , .MIL-R-18281 - Rectifiers, Metallic: Selenium, Copper Oxide, and Magn$sXumCopper Sulfide Types, Naval Shipboard Use. MIL-G-18586 - Gaskets, O-Ring, Shipboard Electrical Junction Box, MIL-T-19474 - Thermometer, Sef Indicating, Liquid-In-Glass, 5-Inch. MIL-A-19521 - Anodes, Corresion Prevent
8、ive, Zinc, Design of and Installation in Shipboard Condensers and Heat Exchangers cal Equipment for Naval Shipboa rd Use), Motive Equipment). ment for Naval Shipboard Use), Naval Shipboard Use, Alternatin5 Current) (Naval Shipboard Use). (Naval Shipboard Use), (for Maximum Net Loads of 3000 Pounds),
9、 _.q_ I ! -_ _ .: ,i-. 2 _- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-G-L7720 bL W 9779906 0087778 T W MIL-G- 1972O(SHIPS) NAVY DEPARTMENT General Specifications for Inspection of Material. General Specifications for Ships, Section S39-2.-
10、ThsiimLInsl%S.oLand AoouStic Bbsorpiiu Section 862-5 - PDevices for Electric. Circuits. TFre-q .:;: : : i r ,.: . . . ments for turbines shall be as follows: . (a) Rotor - 12 to 14 percent chrome steel. . (b) Diaphragms - 12 to 13 percent chrome steel. (c) Valve seats - Stellited. (d) Steam admissio
11、n half of firststage shell shall be protected (e) Turbine casings between diaphragms and all steam sealing (f ) Internal moisture collectors shall be provided, where necessary. with 12 to 16 percent chrome. surfaces shall be lined with 12 to 16 percent chrome. 3.2.6.1 In lieu of the requirements spe
12、cified in items (d) and (e), considera- 3.2.7 Rotor. - . tion shall be given to furnishing a 13. percent chrome casing. . . . . I The rotor shall be designed so .that the average stress in the . u _ -.,.- . _._._I . - .- . , most highly stressed cross-section of the bladed rotor, under design operat
13、ing con- -.-.- ditions, shall not exceed a stress value corresponding to a minimum factor of safety of 2. O, based upon the yield strength (O. O2 percent off set) of the -msite?M. most highly stressed cross-section of the blades, under design operating conditions, safety of 2.0, hased upon the yield
14、 strength (O. 02 percent offset) of the material, to be used therewith shall not apply. In lieu theref, connections to the glands shall be provided to connect to the gland seal regulation system whioh will be furnished with the propulsion units. The glands and piping shall be designed to withstand a
15、 steam pressure of 150 p. s. i. g. in event of failure of the regulator. 8 . . -. “ . . . . , . . 3.2.8 Blades. - The blades shall be designed so that the average stress in the . . shall not exceed a stress value corresponding to a minimum calculated factor of . 3.2.9 The requirements for a gland se
16、al manifold and a compound pressure gage . -. .- ._ . . - . . . - .- ,_-._. -. . , . x: *.- . ,.-.- . /.:.zz:x;-. *.*. ;.yz*.: -. -.-. I. . , ,. . ., ; I C:.7:.Y: ,* . . .- - ._ : _. . ./ L I - . _. - . _ . . . . . 8“ .PROBLEM HARD copy I Provided by IHSNot for ResaleNo reproduction or networking pe
17、rmitted without license from IHS-,-,-MIL-G-L7720 bL 7797706 008778Lt 5 = MIL-G- 197 20 (SHIPS) 3.2.10 A turbine casing relief valve and a back pressure trip shall not be supplied. 3.2; 11 The governing system will be supplied with oil from the ships control oil system at not more than 80 p. s, i. g.
18、 The debign shhlbbased on the use of Navy symbol 2190 TEP oil, 3.2.12 The trip throttle valve requirements shall apply except that, when the trip throttle valve has functioned to trip the turbine, it shall be necessary to reset the actuating devices to their normal operating position and to turn the
19、 throttle valve handwheel to the closed position before steam may again be admitted to the turbine. The valve shall normally be held open by oil pressure from an external source. When the unit is subjected to the shock shown on figure 1, the overspeed trip mechanism shall not function to trip the th
20、rottle valve. 3.2.13 Thermometers for measuring temperatures other than those specified in 3.1.12 herein, shall be in accordance with Specification MIL-T-17244, or type II of Specification MIL-T- 19474. 3.2.14 In addition to provision for the use of a portable hand tachometer, a speed indicating dev
21、ice conforming to type IC/EFB of Specification MIL-T- 16049 and an indicating meter shall be provided with the indicating meter mounted on the turbine gageboard. The meter shall cover a range of speed from O r. p. m. to 11 percent above rated speed. valves, and nozzle chambers shall be tested hydros
22、tatically after assembly to a pressure of 1275 p. S. i. g. 3.2.15 All inlet steam fittings and connections; such as steam chests, throttle 3.2.16 The requirements for the overspeed test shall apply except that the maxi- mum reading of the vibration indicator shall not exceed O. O01 inch double ampli
23、tude on the shaft on either end of the turbine. 3.2.17 The governor synchronizing motor shall be a single phase, readily revers- ible, commutatorless a. c. motor in accordance with Specification MIL-M- 17059. 3.2.18 The greatest degree of interchangeability practicable shall be achieved between part
24、s of the turbine and parts of the propulsion turbine. witin inlet steam conditions of 285 p. s. i. g. (i percent maximum moisture) and with an exhaust pressure of 4 inches of mercury absolute when the unit is delivering 500 kilo- watts. 3.2.19 The turbine steam rate shall not exceed 18.7 pounds per
25、kilowatt hour 3.2.20 An automatic switch to trip a circuit breaker when the overspeed trip functions will not be required. 9 7 PROBLEM- HARD COPY Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-G- 19720(SHIPS) 3.2.21 Thermocouple detectors (see 3
26、.1.12) furnished for the bearings shall be located in the loaded half shell between the loadline and 20 degrees past the loadline, or as approved by the bureau or agency concerned. 3,3 A, C. enerators. - Generators shall conform to Specification MIL-G-3124, exuept as 719- ot erwis specified hereinaf
27、ter: 3,3.1 The generator efficiencies shall be not less than 88.2 percent at 50 per- cent load and 91.8 percent at 100 percent load including excitation. 3.3.2 Bearings shall be of the sleeve type, forced lubricated from the turbine lubrication system. Sight flow fittings shall be provided at the be
28、aring oil discharge. 3,3,3 The generator air cooler shall be in accordance with class I of Specifica- tion MIL-E-2036, 3.3.3.1 Salt water flanges shall conform to Drawing B-176 with thickness con- forming to Drawing B-177. 3.3,3. .2 Consideration shall be given to the use of O-ring gaskets conformin
29、g to Specification MIL-G- 18586. 3.3.3.3 In lieu of protective anodes as required by Specification MIL-E-2036 the cooling water side of the cooler shall be fitted with corrosion preventive anodes in accordance with Specification MIL-A- 19521. 3.3.3.4 The cooler shall be designed for the “submergence
30、 design pressure specified in the contract or order, The hydrostatic test pressure shall be the (sub- mergence test pressye” as specified (see 6.1). as specified in 3.1.12. 3.3.4 Temperature detection equipment for .the generator and air cooler shall be 3,3.6 The short circuit ratio shall not be les
31、s than O. 8. Units shall be electri- 3,3.6 Generators shall be capable of withstanding, without injury to any part, cally stable under all operating conditions, a three-phase short circuit at the terminals for a period of 30 seconds with the genera- tor under the control of the voltage regulator, Th
32、e generator shall withstand a single phase short circuit between any two terminals for a period of 30 seconds with the generator under control of the voltage regulator. Total temperatures obtained dur- ing these periods shall not exceed safe values. 3.3.7 At rated voltage and frequency and at a powe
33、r factor of O. 5 or less, each generator shall be capable of deliverjiig 150 percent rated current for 2 minutes. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I.- . ., . 2 .I . . . . . 7 ._II- u . . . . . . . . . . . . r. :.-.-:.?.Y: I.2 . ,. . .
34、. . . I.- . .! . i-;: Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-G-19720 61 W 7997706 0087788 2 MIL-G- 19720(SHIPS) c. Maximum allowable case temperature for the method of cooling and rating listed. d, Thermal impedance between rectuier junc
35、tion and case expressed in degrees centigrade per milliwatt or power dissi- pated. e. Power dissipation under rated conditions, f, Maximum allowable internal (at rectifying junction) temperature. (5) Life expectancy for 95 percent survival. (d) Assembly drawing of the rectifier cell or rectifier sta
36、ck or assembly where other than individual cells are used shall contain the following information: (I) Construction. (2) Overall and mounting dimensions. (3) Number of cells in series and in parallel per (4) Type of circuit and cell arrangement. 1For single cells these items may be listed separately
37、. (1) Applied voltage. rectifying element . (e) Conditions and requirements of the specific application: a. Nominal a. c. r. m. s. voltage, tolerances and duty cycle. b. Estimated transient peak voltage and volt- seconds for which !he transient exceeds the peak value of the nominal applied voltage w
38、ith: I. The proposed rectifier and 2. An ideal rectifier or synchronous swikch. c. D. c. reverse voltage and duty cycle (if applicable, for example, blocking, voltage reference and vol-tage regulating applications). (2) Output current. a. Nominal. b, Maximum (with combination of conditions in. the n
39、ormal operating range which gives the highest value). c. Dtltf cycle. tions). a. Nominal. b. Maximum. c. Minimum. (3) Average reverse current (for magnetic amplifier applica- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-_ - MIL-G-17720 b1 7979906
40、0087789 4 I MIL-G- 10720(SHTPS) (4) Supply frequency and tolerances. (5) Ambient temperature at the rectifier. (6) Method of coolirg used and cooling data. (7) Identification as to where used and function. (1) Proof (test data or certification based on actual test data) of ability to perform satisfa
41、ctorily at rated conditions after exposure to high impact mechanical shock, vibration, temperature cycling, salt spray and moisture influence, There shall be no evidence of mechanical damage, corrosion or evidence of degradation of electrical character is tics, a. HI shock should be in accordance wi
42、th type C of Specification MIL-S-901 using mounting adaptor shown on figure 6E. Equipment shall be grade I of Specifica- tion MIL-S-901. b, Vibration should be in accordance with type I of Standard MIL-STD-167. c. Temperature cycling should be in accordance with method 102 of Standard MIL-STD-202 ex
43、cept the maximum temperature shall be 200“ C, instead of 85“ C, or 65C. as indi- cated therein.- d, Twenty-four hour salt spray exposure shouXd be in accordance with method 106 of Stand- ard MIL-STD-BOB. (f ) Reliability substantiation: (2) O eratin data,- Predicted life expectancy shall be fur- -ta
44、rifkited by operating data on samples of the proposed rectifiers taken from production runs and operated at or above the voltage, current and tempera- ture indicated in (e) (l), (Z), and (5), respectively with cooling provisions comparable with those required by the application, Rectifiers shall be
45、supported by more than 5000 hours of operating data to be considered or approval. Life expectancy shall be at least 40,000 hours. Changes in manufacturing process or quality control techniques which have been instigated in production units subse- quent to selection of samples for test should be repo
46、rted 5nd justified as to why they do not necessitate rerunning of tests, (3) Assurance from the manufacturer that the proposed rectifier cells and stacks or. assemblies are available as production items and that adequate quality control measures are in force to assure -production of a high quality r
47、ectifier. 14 I 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-G-L9720 bL m 9999906 0087790 O MIL- G- 197 20 (SHIPS) 3.3.12.2.2.1 Silicon rectifiers shall be acceptable without submission of the reliability substantiation data required by 3.3.1
48、2.2.2 (f) if: (a) The rectifier is on the Qualified Products List of Specifica- (b) Similar rectifier units have passed the type-C shock test of tion MIL-E - 1. Specification MIL-S-901 or the complete equipment in which the rectifier is to be applied is capable of passing the shock test specified in Specification MIL-S-901. (c) Data is present.ed showing at least 5000 hours of operation under conditions as severe as that of the intended applica- tion and the observed reliability is equal to that required. Ninety-five percent survival for 40,000 hours is considered normal
