1、26 August 1955 SUPERSEDING 33P18d 1 October 1943 MILITARY SPECIFICATION PACKING, PREFORMED, CARBON; AND CARBON STOCK, PACKING Ail interested bureaus of the Department of the Nq baue corcuwed in the use of tbis specification. 1. SCOPE 1.1 Scope. - This specification covers carbon packing material (17
2、00) for rotary rod and shaft 1.2 Classification. - The packing shall be of the following classes, as specified (see 6.2): ser vice. Class 1 - Soft. Class 2 - Medium. Class 3 - Hard. 2. APPLICABLE DOCUMENTS 2.1 The following specifications and standards, of the issue in effect on date of invitation f
3、or bias, SPECIFICATIONS form a part of this specification: FEDERAL NN-B-591 - Boxes, Fiberboard, .Wood-Cleated (for Domestic Shipment). NN-B-631 - Boxes, Wood, Wirebound (for Domestic Shipment). LLL-B-631 - Boxes, Fiber, Corrugated (for Domestic Shipment). LLL-B-636 - Boxes, Fiber, Solid- (for Domes
4、tic Shipment). PPP-B-575 - Boxes, Straparound. , PPP-B-601 - Boxes, Wood, Cleated Plywood, JAN-P-103 - Packaging and Packing for Overseas Shipment - Boxes, Wood JAN-P-106 - Packaging and Packing for Overseas Shipment - Boxes, Wood JAN-P- 108 - Packaging and Packing for Overseas Shipment - Boxes, Fib
5、er- MIL-P-116 - Preservation, Methods of. JAN-W-562 - Wire, Nickel-Alioy, Spring (Hat-Resistant and Age-Hardenable). MIL-B-4229 - Boxes; Paperboard; Metal-Stayed. MIL-N-7786 - Nickel-Chromium Alloy, Sheet and Strip, Age-Hardenable Annealed. MIL-B- 10377 - Boxes; Wood-Cleated, Veneer, Paper Overlaid.
6、 MIL-L- 10547 - Liners, Case, Waterproof MILITARY Cleated; Solid Fiberboard. Nailed. board (V-Board and W-Board), Exterior and Interior. - THIS DOCUMENT CORTKNS- -10 PAGES. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-18493 53 m 7977906 0230
7、6114 4 Ir NAVY DEPARTMENT General Specifications for Inspection of Material. STANDARDS MILITARY MIL-STD-105 - Sampling Procedures and Tables for Inspection by Attributes. MIL-STD-129 - Marking for Shipment and Storage. (Copies of specifications, standards, drawings, and publications required by cont
8、ractors in connection with specific procurement functions should be obtained from the procuring agency or as directed by the contracting officer. ) 2.2 Other publications. - The following document forms a part of this specification Unless otherwise indicated the issue in effect on date of invitation
9、 for bids shall apply. CONSOLIDATED CLASSIFICATION COMMITTEE Consolidated Freight Classification Rules. (Application for copies should be addressed to the Consolidated Classification Committee, 202 Chicago Union Station, Chicago 6, .Ill.) 3. REQUIREMENTS 3.1 Material. - Packing material shall be com
10、posed of refined coke, lubricating graphite, or refined coke and lubricating graphite, and a suitable binder, and shall contain no abrasive or other material which may affect its serviceability. 3.1. 1 Composition. - 3acking material shall conform to the composition shown in table I. Table I - Compo
11、sition. Fieldcarbon : Ash : sulfurI : Class : minimum maximum : Percent : Percent : Percent : :1: 95. o : 1.5 : 1 :2: 94. o : 2.0 : 1 :3; 93. O : 3.0 : 1 1Sulfur content shall be determined as a matter of record. 3.1.2 Character of ash. - When the packing material is tested as specified in 4.3.2, th
12、e ash shall be soft and fluffy and shall contain no hard or abrasive particles. . -. . . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MlL-P-l8493(NAVY) 3.2 Physical requirements. - The packing material shall conform to the physical requirements sh
13、own in table lI. Table II - Physical requirements. : Hardness, Apparent. I PorosLty :Abrasion loss numerical, : density(mini- . cmaximum) * : (maximum) : (Shore) : per cubic inch :per revolution: i lass : scleroscope : mum) pounds : percent , milligrams - - . - : 1 : 20-50 : : 2 : 30 - 60 : 0.OMii :
14、 16.0 : 2.0 :3 : rn-90 : - - . - 3.3 Form and dimensions. - The packing material shall be furnished in solid carbc 3.3.1 Rings. - 3. 3: 1.1 The joints of the rings shall be of the butt type. ring form and shali be of the dimensions specified (see 6.2). stock or 3.3. 1.2 The flat sides of each ring s
15、hall be parallel and shall have a smooth, even surface, The inside diameter shall be ground true and a perfect right angles to the side of the ring, 3.3.1.3 Unless otherwise specified in the contract or order, the inside diameter of all rings shall be finished to the nominal shaft diameter witha per
16、missible variationof minus nothing and plus O. 001 inchper inch of nominalshaft diameter. The diameter shallbe measured with segments concentric and all joints butted, relative position as whe.n manufactured. cold-drawn, spring-temper, corrosion-resisting steel wire or commercial nickel-copper-alumi
17、num wire. On sizes for shafting Irger than 4 inches in diameter, a corrugated spring of commercial tungsten-chrome-vanadium steel, or a corrosion-resisting steel band whose ends are held together with a tungsten-chrome-vanadium coil spring, may be furnished. The strength of the springs shall be such
18、 that an elongation of not more than 15 percent shall be sufficient to hold the ring segments lightly against the shaft, For steam turbines, springs shall be of one of the following materials: 3.3.1.4 The segments of each ring shall be marked so tht they may be assembled in the same 3.3.1.5 Each rin
19、g shall be furnished with one coiled garter spring made of either commercial (a) JAN-W-562, class 2 (spring temper), or (b) JAN-W-562, class 2 (spring temper), except for chemical composition as follows: .Element Percent Nickel (including cobalt) 70.00 min. Chromium 14.00 - 17.00 Titanium 2.00 - 2.7
20、5 Aluminum 0.40 - 1.00 Iron 5.00 - 9.00 Mangane se . 1.00 max. Siiicon O. 70 max. Copper O. 50 max, Carbon O. 08 max. Sulfur O. 08 max. (c) MIL-N-7786, condition and finish as specified (see 6.2). Note. - Items (a) and (c) above, to the compositions showninSpeci- - fications JAN- W-562 and.MIL-N-778
21、6, respectlveIy are known commercially as “Inconel X”, and Rem (b) as cnconel W”. - .*Y . -f i Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-18493 53 979706 0230646 MIL-P- 18493(NAvy) 3.4 Workmanship. - Packing material shall be free from lam
22、hatiom, shrinkage, cracks, or other 4. QUALITY ASSURANCE PROVISIONS imperfect io 11s. 4.1 Sampling, - 4.1. 1 Lot. - For purposes Of sampling, a lot shall consist of all ring assemblies or all solid - blanks of one class and Size produced in one plant under essentially the same conditions and offered
23、 for delivery at one time, 4.1.2 Sampling for visual and dimensional inspection (at the place of manufacture). - A randprh sample of ring assemblies or solid carbon stock shall be selected by the Government inspector in accordance with table III from each inspection lot of material offered for Gover
24、nment inspection of visual and dimensional characteristics with lot acceptance based on the sampling inspection requirements in accordance with Standard MIL-STD- 105. Table III - Sampling for visual and dimensional inspection AQL (approx.) = 2;5 percent defective. . : Number of ring : Number of ring
25、 : assemblies or : assemblies : Acceptance : Rejection : : solid carbon or solid number number : : stock in : carbon stock : (defectives) : (defectives) : : inspectionlot : in sample : 1 1 1 2 3 4 5 7 O O O 1 2 3 4 6 15 and under : 7 16 to 40 10 : 41 to 110 : 15 : 111 to 300 : 25 : 301 to 500 : 35 :
26、 501 to 800 : 50 : 801 to 1,300 : 75 : 1,301 and over : 110 4. 1.3 Sampling for lot acceptance tests (at the place of manufacture). - 4.1.3.1 Sampling of ring assemblies. - The Government inspector shall select at random from each lot one ring assembly and one carbon stock, at least 9 inchesby 9 inc
27、hes, of the same composition as that of the rings for the tests specified in 4.2.2. 1. 4.1.3.2 Sampling of carbon stock. - The Government inspctor shall select at random from each lot one carbon stock for the tests specified in 4.2. 2.2. 4.1.4 Sampling for production check tests (at a Government lab
28、oratory). - 4.1.4.1 Sampling of ring assemblies. - From the first lot of ring assemblies of each class and size offered for delivery under a contract or order, and thereafter from one lot in each group of 10 successive lots of ring assemblies of the same class and size, which have passed inspection
29、at the place of manufacture, the Government inspector shall select one complete ring and spring assembly and one carbon stock at least 9 inches by 9 inches, of the same composition as that of the rings. Unless 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license fro
30、m IHS-,-,-MIL- P- 1849 3 (NAVY) otherwise specified in the contract or order, the samples so selected shall be forwarded by the Govern- ment inspector to the U. S. Navl Engineering Experiment Station, Annapolis, Maryland, for the tests specified in 4. 2.3. 4.1.4.2 Sampling for carbon stock, - From t
31、he first lot of carbon stock of each class and size offered for delivery under a contract or orcer, and thereafter from one lot in each group of 10 succes- sive lots of carbon stock of the same class and size which have passed.inspection at the place of manu- facture, the Government inspector shall
32、select one carbon stock. Unless otherwise specified in the contract or order, the samples so selected shall be forwarded by the Government inspector to the U. S. Naval Engineering Experiment Station, Annapolis, *Maryland, for the tests specified in 4.2.3. . 4.2 Inspection and tests. - 4.2. 1 Visual
33、and dimensional insoection (at the wlace of mandcture). - 4.2.1.1 Ring assemblies. - Each of the sample ringassemblies selected in accordance with 4.1.2 shall be visually inspected by the Government inspector to verify compliance with this specification. 4.2,l. 1.1 Dimensions. - The dimensions of ea
34、ch sample ring assembly selected in accordance with 4.1.2 shalllbe determined by the method specified in 4.3.4. 4.2.1.2 Carbon stock. - Each of the sample carbon stocks selected in accordance with 4.1.2 shall be visually and dimensionally inspected by the Government inspector to verify compliance wi
35、th this specification. 4.2.1.3 Action in case of failure. - Any ring assembly or carbon stock containing one or more visual OP dimensional defects shall be rejected, and if the number of defective ring assemblies or car- bon stocks in any sample exceeds the acceptance number for that sample, the lot
36、 represented by the sample shall be rejected. Rejected lots may be resubmitted for Government inspection provided that the contractor has removed or repaired al noncpnforming ring assemblies or carbon stocks. . 4.2.2 Lot acceptance tests (at the place of manufacture). - 4.2.2.1 Lot acceptance tests
37、of ring assemblies. - The sample ring assembly selected in accord- ance with 4.J. 3.1 shall be subjected to the test specified in 4.3.3.1 and the sample carbon stock shall be subjected to the tests specified in 4.3.3.1 and 4.3.3.2. if any one of the samples tested is found to be not in conformance w
38、ith this specification, the lot which itrepresents shall be rejected. Rejected lots may be resubmitted for acceptance tests provided the contractor has removed or reworked all nonconforming products. 4.2.2.2 Lot acceptance tests of carbon stocks. - The sample carbon stocks sele.cted in accordance wi
39、th 4. 1.3.2 shailbe subjected to the tests specified in 4.3.3. 1 and 4.3.3.2. if the sample tested Ls found to be not in accordance with this specification, the lot which it represents shall be rejected. Rejected lots may be resubmitted for acceptance tests provided the contractor has removed or rew
40、orked alnonconformfng products. 4.2.3 Production check tests (at a Government laboratory). - The sample spec1men.s selected in accordance with 4.1.4 shall be subjected to the tests specified in 4 .3. 4.2.3.1 Action in case of failure. - Acceptance of the first lot offered for delivery under a contra
41、ct or order shall be withheld until a satisfactory report is received on the production check test sample. Thenceforth, except as hereinafter specified, acceptance and rejection of lots shal normally be on the basis of the sampling, inspection, and tests specified in 4.1.2, 4.1.3, 4. 2.S and 4.2.2,
42、and Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-P-I8473 53 m 7777706 0230b118 I m MIL-P- 18493(NAVY) acceptance shall not be wi ing receipt of production check test reports unless, in the opinion of the Government inspect stances require suc
43、h action. However, upon receipt of an unsatis- factory test report on a production check test sample, the Government inspector shall select additional samples from every subsequent lot offered for delivery, The sample so selected shall bs submitted to the U. S. Naval Engineering Experiment Station,
44、Annapolis, Maryland, and shall there be subjected to the test or tests wherein failure was observed. Lots shall then be accepted only upon receipt of a satis- factory test report on the samples so selected. Additional testing shall be discontinued and lot accept- ance returned to the normal basis wh
45、en four successive lots have ken accepted. 4.3 Test procedures. - The tests shall be performed as follows: 4. 3. 1 Chemical analysis. - - 4.3.1.1 Fixed carbon. - Fixed carbon shall be computed as follows: 100 minus (moisture plus ash 4.3.1.2 Moisture. - The oven shail be so constructed as to have un
46、iform temperature in all parts plus volatile matter) equals percentage of flxed carbon. and a minimum of air space. Provision shall be made for renewing the air in the oven at the rate of two to four times a minute, with the air dried by passing it through concentrated H$O4. Heat an empty capsule or
47、*shallow dish of convenient size to 105“ Centigrade (C.) (221“ Fahrenheit (F.), stopper or cover, cool over concentrated H2SO4 (specific gravity 1.84) for 30 minutes, and weigh. Dip out, with a spoon or spatula, 5 grams (gm.) o sample, which has been ground to pass a No. 20 sieve, heat 1-1/2 hours,
48、cool, and weigh e difference between the original and the final weight is moisture. Compute to a percentage basis. 4.3. 1.3 Ash. - A gas or electric muffle furnace having a good air circulation and capable of having its temperature regulated between 700“ and 750C. (1292“ and 1382F.) shall be used. P
49、lace a porcelain capsule or shallow dish of convenient size, containing dried material from the moisture determination, In a cold muffe furnace or on the hearth at low temperature, and gradually heat to redness at such a rate as to avoid mechanical loss from too rapidexpulsionof volatile matter. Pinishthe ignition to constant weight at a temperature between 700“ and 750C. (1292“ and 13820F.). Cool in a desiccator and weigh as soon as c
