1、RfaY-/ -, MIL-B-2947A 44 M 7777906 O209020 4 M MILITARY SPECIFICATION BLOWERS, SOOT (SHIPBOARD USE) 1. SCOPE 1.1 Scope. - This specification covers steam boiler soot blowers suitable for cleaning boiler firesides. 1.2 Classification. - Soot blowers shall be of the following types and classes, as spe
2、cified (see 6.1): Type I - Stationary. Type II - Rotatable. Type I - Short retractable. Type IV - Long retractable. Chis 1 - Maximum boiler operating pressure 600 pounds per square inch (p. S. i. ); maximum steam temperature 875F. Class 2 - Maximum boiler operating pressure 1500 p. s. i. ; maximum s
3、team temperature 975F. 2. APPLICABLE DOCUMENTS 2.1 The following specifications, standards, and publications, of the issue in effect on date of invitation for bids, form a part of this specification to the extent specified herein: SPECIFICATIONS FEDERAL PPP-B-585 PPP-B-591 PPP-B-601 PPP-B-621 PPP-B-
4、636 PPP-T-76 . MILITARY MIL-P-116 MIL-B-233 Boxes, Wood, Wirebound Boxes, Fiberboard, Wood- Cleated. Boxes, Wood, Cleated- Plywood. Boxes, Wood, Nailedand Lock-Corner. Box, Fiberboard. Tape, Pressure-Sensitive Adhesive Paper, Water Resistant. Preservation, Methods of. Boxes, Rem Parte. 18 August 196
5、 SUPERSEDING MIL-B-1947 31 January 1950 Mil-B-857 Bolts, Nuts and Studs. MIL-S-901 Shockproof Equipment, Class HI (High-Impact), Shipboard Application, Tests for. MIL-S-933 Screws, Machine, Cap and Set;and Nuts. MIL-D-963 Drawings, Production, Pro- cechue for Procurement of. (Bolt m; Nuts, Plain, He
6、xagon; amd Steel Bars, Round- High Temperature Service. MIL-B-10377 Boxes: Wood- Cleated, Veneer, Paper Overiaid. MIL-L-10547 Liners, Case Waterproof. MIL-P-15024 Plates, Identification- information and Marking for Identification of Elec- trical, Electronic and Mechanical Equipment. MIL-P-15137 Prov
7、isioning and Technical Documentation for Repair Parts for Electrical and Meckdd Equipment (Naval Shipboud Use). for Domestic and Over- seas Shipment ad Storage. ML-C-16173 Corrosion Preoeative Com- pound, Solved cutbpck, Cold ApplLcaiion. MIL-S-1222 Stub, continuou Thrad MIL-P-15424 Ri- of Haiid Too
8、ls MILITARY JAN-STD-19 Welding Symbols. MIL-STD-22 Welded-Joint Designs. - MIL-STD-106 Sampling Procedures and Tables for Inspection by . Attrihtei. MIL-STD-129 Marking for Shipnent and Storage. MIL-STD-167 Mechanical Vibrations of ShipboudEqriianent. Licensed by Information Handling ServicesMLL-sID
9、-vl Nondestructive Testing Re- quirements for Metals. MIL-STD-278 Welding and Allied Processes for Machinery for Ships of the United States Navy. PUBLICATIONS BUREAU OF SHIPS NAVSHIPS 250-692-13 - RtdigraphiC Standards for Steel Castings. (Copies of specifications, standards, drawings and publicatio
10、ns required by contractors in connec- tion with specific procurement functions should be obtained from the procuring activity or as directed by the contracting officer). 2.2 Other publications. - The foiowing docu- ments form a part of this specification to the extent specified herein. Unless otherw
11、ise indicated, the issue in effect on date of invitation for bids shall apply * AMERICAN STANDARD6 ASSOCJATION B16.5-Steel Pipe Flanges and Flanged Fittings (Application for copies should be addressed to the American Standards Association, nc. 70 East 45th Street, New York 17, N. Y.) AMERICAN IRON A
12、ND STEEL INSTITUTE Steel Products Manual Application for copies should be addressed to the American Iron and Steel institute, 350 Fifth Avenue, New York 1, N. Y.) AMERICAN SOCIETY OF MECHAMCAL ENGINEERS SA106 - Seamless Carbon-Steel Pipe. SA182 - Forged or Rolled Alloy-Steel. SA276 - Corrosion-Resis
13、ting Steel Bars. Boiler and Pressure Vessel Code, SA217 - Alloy Stel Castings. Section MI - Rules for Construction of Un- fired Pressure Vessels. (Application for copies should be addressed to the American Society of Mechanical Engineers, 29 West 39th Street, New York 18, N.Y.) Handbook H28 - Screw-
14、Thread Standards for Fed- eral Services. NATIONABUREAU OF STANDARIS (Application for copies should b addressed to the Superintendent of ibcuments, Government Printing Office, Washington, D. C.) OFFICIAL CLASSIFICATION COMM“TEE Uniform Freight Ciassification Rules (AppUouOn for copies should be addre
15、ssed to the olficial Classiication Committee, 1 Park Ave- nue at 33rd Street, New York 16, N. Y. ) 3. REQUIREMENTS 3.1 Head design characteristics. - For all classes of soot blowers, head design stresses for all temperatures above 700F. shall be based up- on allowable stressed indicated in ASME Boil
16、er and Pressure Vessel Code, Section Wr for all comparabe materiais. For the head materials specified for each class (see 3.5.3.6.1 and 3.5.3.6.2), fluctuations of not more than 25F. are permissible. shall be furnished with (p. s.i.) ASA standard mounu flanges conform- ing to Publication ASA B16.5.
17、Clap 2 soot blowers. shall be furnished with 1500 p. 8. i. ASA standard flanges conforming to ASA Publication B16.5. Ali head inlets shall be flanged. If flanged inlet pro- vides an excess opening to valve parts, an adapter mounting flange to ASA standards shali be furnished. 3.3 Materials. - Materi
18、als used in the construc- tion of soot blowers for Naval ships shall be of the quaity best suited for the purpose intended. The material used in the construction of any design shall be of the lightest practicable consistent with the strength required for safety and reliability. 3.3.1. Materials for
19、identification and 1 Thread standards. - Standards for threaded parts shall be in accordance with Handbook H28. 3.3.2.2. Standard bolts, nuts and machine screws. - Except where otherwise specified in the contract or order or approved by the bureau or agency concerned, all bolts, nuts and machine scr
20、ews shaii conform to Specifications MIL-S-933, 2 Licensed by Information Handling ServicesMIL-B-1947A 44 9999906 0209022 MIL-B-857 and ML-S-1222. Nuts and bolts on moving parts or subject to vibration during opera- tion shall be secured by a satisfactory locking device. 3.3.2.3 Thread projection. -
21、Approximately one-half thread shall project clear from the outer face of the nut when nuts are screwed home. Threaded position of such bolts and ends of a stud shall be not less than i-1/2 times the bolt or stud diameter. 3.4 Component parts. - Soot blowers shall con- sist of the following parts: (a
22、) Operating mechanism (see 3.5). (b) Element or lance (see 3.6). (c) For type I and II soot blowers only, bearings or hangers (see 3.7). (d) Boiler casing fitting (stuffing box, boiler casing seal (see 3.8). 3.5 Operating mechanism. - 3.5.1 Description. - Soot blower operating mechanism for each typ
23、e shall consist of the fol- lowing: (a) Type I (stationary) operating mecha- nism shall consist of a steam admis- (b) Type (rotatable) operating mecha- nism shall consist of a steam head or housing including mechanical means of element rotabon geared into the steam admission device. (c) Type (short
24、retractable) operating mechanism shall consist of a steam head or housing including mechanical means of lance translation and rotation geared into the steam admission device. (d) Type TV (long retractathe) operating mechanism shall consist of the follow- iag: (1) Steam head to regulate steam admissi
25、on device. (2) , Traveling carriage to effect lance translation and rotation. . sion device (valve) only. 3.5.2 Type I, soot blowers (operatin mechanism). - Unless otherwise specified (se! 6. l), type I soot blowers shall be complete with steam valves. Steam valves shall conform to ASME and ASA stan
26、dards suitable for the source of steam. A spring-loaded air relief valve of corrosion-resistant material (3/8 inch i. p. S. minimum) shall be pro- vided to admt pirging air to the element and to prevent combustion gaees from entering the piping. MIL-B- 1947A(SHIPS) t A3/8 inch connection shall be pr
27、ovided for this purpose. The air relief value shall be connected to the pressurized air space by 1/2 inch i. p. S. tubing and joints as approvpd by the bureau or agency concerned. 3.5.3 Steam head (types II, III, and IV). - 3.5.3.1 Operation. - The steam head shall be designed to transmit steam to t
28、he element or lance from a fixed steam connection without steam leak- age when the element or lance is being operated. It shall be designed to permit installation on the boiler so that the steam supply line to the head may be led at any angle in a plane normal to the axis of the soot blower element.
29、 3.5.3.2 Steam control valve. - The steam con- trol valve shall be either power operated by an air motor of the head or manually operated as speci- fied (see 6.1). Manual operation may be either by means of a single endless chain or by a crank as approved by the bureau or agency concerned. Ex- tensi
30、on rods and gearing may be substituted, if space iimitations so indicate. method-of steam admission and steam pressure control shall be a8 approved by the bureau or agen- cy concerned. Means of pressure control shall be included in each head design to reduce the pressure at the element to the blowin
31、g pressure for optimum cleaning of the tube surfaces. A 3/8 inch NPT tap is to be provided in each soot blower head for in- sertion of a pressure measuring device. A plus or minus tolerance of 25 p, s. i. on this pressure wil be permitted in the actual installation. This pres- sure control shall be
32、an adjustable part of the head in order to effect the above designated steam en- trance pressure. The control shall be capable of external adjustment. 3.5.3.3 Steam pressure control in head. - The 3.5.3.4 Power drive. - When air-motor driven soot blowers are specified, these air motors shail operate
33、 both the steam control valves and the des- ignated movement of the elements. The use of cast iron in the motors is not permitted. The drive shall also include the necessary pishbutton stations for actuation of the air-motors. Panel boards for mounting the pushbutton stations shall be provided. The
34、eel boards shall have an interlocking device to prevent operation of more than one soot blower at a time, and an indicating light to indicate when soot blowers are in operation. Interconnecting piping between air motors and control panels shall not be furnished. Provision shall be made for hand oper
35、ation of the soot blowers should control air be unavaiiable. i 3 Licensed by Information Handling Services MIL-B-1947A 44 999990b 0207023 T M MIL-B-l947A(SHI PS) 3.5.3.5 Scavenging air valve. - A spring-loaded scavenging air valve (see 3.5.2) shail be provided on the soot blower head to provide purg
36、ing air to the element and to prevent combustion gases from enter- ing the soot blower head. A 3/8 inch connection on the soot blower head shall be provided for this pir- pose. The scavenging air valves shall be connected to the pressurized air space by 1/2 inch i. p. s. tub- ing and joints as appro
37、ved by the imreau or agency concerned. . 3.5.3.6 quirements in 3.5.3.6. Head materiais. - Minimum design re- for head materials shall be as specified 1 and 3.5.3.6.2. 3.5.3.6.1 Class 1, 600 psi operating pressure, 815F. - Minimum Class 1 design requirements for head materials shall be as follows. Si
38、milar Ameri- can iron and Steel Institute designations conforming to the Steel Products Manual are also approved. Head- Carbon molybdenum aiioy steel. Castings in accordance .with ASME Publication SA-217. Valve discs - - - - - Cast carbon molybdenum alloy steel in accordance with ASME Publication SA
39、-217 or forged carbon molybdenum alloy steel in accordance with ASME Pub- lications SA-182 or SA-276; seating area faced with ring of not less than 3/32 inch layer of cobalt alloy Stellite,No. 6 or equivalent type. Valve s eats - - - - - Materials shall be the same as for the discs. Seats may be mad
40、e an integral part of the body or may consist of tubuar insert welded into the body. Seating area shall be faced with finished thickness of not less than 3/32 inch layer of cobalt chromium alloy Steliite No. 6 or equivalent type. accordance with ASME Publica- tions SA-182 or SA-276. * Valve stems-Co
41、rrosion-resisting steel in 3.5.3.6.2 Class 2, 1500 p. sei. operating pres- sure 975F. - Minimum class 2 design requirements for head materials shall be as follows: Head- 1-1/4 percent chrome; 1/2 pes- cent molybdenum alloy steel casting in accordance with ASME Publication SA-217, - -n Valve discs- C
42、ast chromium alloy steel in accordance with grade WC6 of ASME Pubiication SA-217 or forged chromium aiioy steel in accordance with ASME Pub- lication SA-182, grade F11; seating area faced with ring of not less than 3/32 inch layer of cobalt alloy of Stellite No. 6 or equivalent type. Valve seats- Va
43、lve seats shall be of the same material as the valve discs; to be made as above for class 1 heads; seating area faced with finished thickness of not less than 3/32 inch of cobalt alloy of Stellite No. 6 or equivalent type. accordance with ASME Publi- cation SA-182, grade F11. Valve stems-Corrosion-r
44、esisting steel in 3.5.3.7 Connecting piece (swivel or extension tube). - A tubular connecting piece shall be provided between the head and the element. Corrosion- resisting material shall be used where the piece passes through the stuffing box in the head. The connecting piece shall be for the purpo
45、se of secur- ing the element to the head during field installation in a suitable manner to insure maintenance of the proper angular position of the nozzles with respect to the operating mechanism in the head. An indica- tor to show the angular position of the nozzles lo the operator at all times sha
46、ll be attached to the gear wheel or secured by other means approved by the bureau or agency concerned. The swivel tube OF the element shall be at least 6 inches longer than designed length to allow for field modification to suit installation conditions. 3.5.3.8 Head interchangeability. - All heads o
47、f like design within the same class shall have fully interchangeable internal parts. All replace- ment heads of types II and l shall be furnished with one 360 degree cam and trigger assembly and one cam assembly that can be modified to fit all other rotation requirements. Replacement swivel tubes or
48、 elements supplied shall provide sufficient length to allow field modification to actual boiler depth conditions (at least 6 inches). Further, for all replacement heads means shall be provided to allow attachment of either 1-1/2 inch or %inch elements. 3.5.4 Steam head for type II, soot blowers. - 3
49、. 5.4.1 peraon. - In addition to operation requirements of 3.5.3, type II soot blower steam 4 Licensed by Information Handling Servicesheads shall be provided with means for rotating the element in conjunction with operation of the steam control valve. Direction of operation in a clock- wise or counter-clockwise direction shall be based on boiler requirement to adequately keep header and casing-pocket areas clean, and to direct loosened soot into uptake gas paths, provided total or combined angie of rot
