1、MIL-T-27027A 69 W 977790b 0387048 5 MIL-T-29027A(TD) 13 March 1972 SUPERSEDING 22 February 1971 MIL-T-29027 (TD) MILITARY SPECIFICATION FOR TRAINING AID; IMPULSE STEAM TRAP This specification has been approved by the Naval Training Device Center, Department of the Navy. 1 . S.COPE 1.1 and fabricatio
2、n of an enlarged scale training aid of the Impulse Type Steam Trap. This specification establishes the requirements for the design 1.1.1 This item has been designated by the Naval Training Device Center, s Device 29GD1 for Navy Procurement. (see 6.2). 2. APPLICABLE DOCUMENTS 2.1 The following docume
3、nts of the issue in effect on the date of invttation for bids, or request for proposal, form a part of this specification to the extent specified herein: SPEC1 FICATIONS Federal PPP-B-601 Boxes, Wood, Cleated-plywood P P P 2B -6 2 1 Boxes, Wood, Nailed and Lock-corner PPP-B-636 Box, Fi berboard Mi 1
4、 i tary MIL-P-116 - Preservation; Methods of MIL-A-8625 Anodic Coatings, For Aluminum and Al umi num Al 1 oys MIL-L-10547 Liners, Case and Sheet, Overwrap; Water-V porproof or Waterproof, rFjlRl!l d A Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-M
5、IL-T-27027A 67 m 7777706 0387099 7 m I:( MIL-T-0023991 STANDARDS Mi 1 tary MIL-STD-129 Training Devi ces , Mi 1 i tary ; General Speci fi cat i on for Marking for Shipment and Storage PUBLICATIONS Mi 1 i tary MI L-HDBK- 220 Glossary of Training Device Terns (Copies of specifications, standards, draw
6、ings and pub1 ications required by suppliers in connection with specific procurement functions should be obtained from the procuring activity or as directed by the Contracting Officer.) 3. REQUIREMENTS 3.1 Materials.- Materials shall be as specified in 3.1.1 through 3.1.6. Materials not specified sh
7、all be in accordance with the materials requirements of MIL-T-0023991. 3.1.1 Metals.- Metal parts shall be of a corrosion-resistant metal or shall be treated to resist corrosion under the environmental conditions specified in 3.3. 3.1.1.1 Parts constructed of aluminum alloys shall be hard coat 3.1.1
8、.2 Exposed steel parts shall be satin-finish chrome plated, pnodized in accordance with MIL-A-8625, except for springs. 3.1.1.3 Brass .parts shall be satin-finished and then coated with clear epoxy or cldr exterior acrylic lacquer, or satin-finish chrome plated. 3.1.2 Wood.- Wood shall be of select
9、grades of hardwood suitable for clear finishes. Wood shall be seasoned, free from checks, splits and crossgrain or seasoning defects which may cause warping. 3.1.3 Glue,- Glue shall not be affected by moisture, lacquer, 7 paint, or migratory solvents of plastics used in components, including the dus
10、t cover of 3.6.4. discoloration, deformation and similar defects, upon aging or when subjected to environmental conditions specified in 3.3. * 3.1.4 Plastics.- Plastics shall be resistant to cracking, brittleness, Provided by IHSNot for ResaleNo reproduction or networking permitted without license f
11、rom IHS-,-,-1 ! MIL-T-29027A 69 W 999970b 0387050 3 - 3.1.5 Plywood.- Plywood shall have a minimum of 5 plies or solid core, both surfaces to be of hardwood, all plies to be free of spaces or checks and joined by moisture-resistant glue. 3.1.6 Plastic cementing.- Contact surfaces of plastic pieces t
12、o be joined shall be machined or sanded. Wherever possible, a cushion surface shall be developed on one contact surface. Cement solvents shall be used as recomnended by the manufacturer of the particular plastic used and tested by the contractor for each specific application to conform to the requir
13、ements of 3.3. Cemented joints shall be free of bubbles and form a strong homogeneous bond. approval of the procuring activity for each specific application. Capi 11 ary joints shall require prior written 3.2 Desi n .-Device 29GD1 shall be an operable table top training aid designe -+ to represent s
14、ections through the appropriate planes of the components of an impluse steam trap, which most effectively depict its operation. It shall be capable of illustrating vertical motion of the control piston. The training aid shall clearly depict air, condensate, and flash steam presence within the valve,
15、 as well as flow of air-condensate- steam mixtures through the valves at various times in the operating cycle, 3.3 Reliabilit .- The training aid shall be designed for a useful classroom 4 i e o hours per week for a period of not less than 5 years. Reliability shall be a prime consideration in the d
16、esign and manufacture of the training aid. The design shall be such as to result in reduced require- ments for adjustments or alinement. The training aid shall be constructed so no fixed part shall become free and no moving part shall become loose or sluggish in operation. Degradation shall not be c
17、aused because of shipment, normal handling in a classroom use or storage. The training aid shall be designed for storage and transportation when under ambient conditions of temperature ranging from -5 to +125 Fahrenheit, relative humidity ranging up to 95 percent, and still be capable of meeting the
18、 specification require- ments. 3.4 Constructtlon.- Construction shall be in accordance with processes requirements of MIL-T-0023991, and as specified in 3.4.1. 3.4.1 Breakage and deformation.- The training aid shall be constructed from impact-resistant plastic or other suitable material, (see 3.1.4)
19、 to min$mize the possibility of breakage and deformation during use by the instructor or students. 3.5 Dimens-ions and tolerances. - 3.5.1 Dimensions,- Dimensions shall be consistent with the functional design of the device and inherent qualities of the material being used. -Y 3 Provided by IHSNot f
20、or ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-27027A 67 m 7773706 0387051 5 m MI L-T-29027A (TD) 3.5.2 Tolerances,- Tolerances in construction, shall be consistent with functional design, inherent qualities of the material being used, and shall afford freedom fr
21、om binding in structural and mechanical parts, to insure free and easy operation of all moving parts of the training aid. 3.6 Details of components.- The training aid shall consist of the (a) Steam trap section (b) Control mechanism (c) Base (d) Dust cover. fol lowing major components: 3.6.1 Steam t
22、rap section.- The steam trap section shall be in accordance with the requirements specified in 3.6.1.1 through 3.6.1.3. 3.6.1.1 Component identification.- Components of the steam trap section shall be 1 abel ed. 3.6.1.2 Main support.- Components of the steam trap section shall be mounted on a transp
23、arent acrylic panel with transparent acrylic end braces. 3.6.1.3 Colors.- Colors for steam trap section components shall match the colors specified by the procuring agency. 3.6.2 Control mechanism.- The training aid shall include a lever for manually operating the control piston. The control mechani
24、sm shall be in accordance with the requirements specified in 3.6.2.1 through 3.6.2.4. 3.6.2.1 To moire the control piston up, the control lever shall be shifted up. be shifted down. Conversely, to move the control piston down, the lever shall 3.6.2.2 The control mechanism shall be so designed as to
25、allow the control piston to remain in any position selected by the instructor, without further effort or adjustment. 3.6.2.3 The control mechanism- shall be readily accessible and shall be operable by normal finger pressure. 5.6.2.4 Nylon guide strips shall be affixed on either side of the 3.6.3 Bas
26、e.- The steam trap section shall be mounted to a base in piston ialve tos provide proper alinement and movement with minimal friction. accordance witfi the requirements of 3.6.1.2. 4 . . .-. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-m MIL-T-270
27、27A 67 9977906 0387052 7 m ! 3.6.3.1 Bum ers.- Four rubber or non marring plastic bumpers shall be fastened to t I+- e bottom surface of the base near the corners. These bumpers shall provide 3/4 inch clearance between the bottom of the base and the bottom of the bumpers. flame resistance characteri
28、stics of Armor-Tite reinforced vinyl, 16 ounce weight, light gray, shall be provided to cover the training aid. The dust cover shall be labeled with black lettering of one-half inch size to identify the training aid by title and number, 3.6.4 Dust cover.- A dust cover, equal to the tensile, tear and
29、 3.6.4.1 3.7 Finish and color.- 3.7,l Finish.- Surfaces to be painted shall be properly sealed, primed, and then finished with a satin-surface lacquer in accordance with the Preparation for Painting requirement of MIL-T-0023991, tion of finishes shall be accomplished in such a manner as not to impai
30、r performance of the training aid. structural andchanical functions of the training aid components, inter- connecting parts and fi tti ngs. Appl ica- 3.7,2 Colors.- A color code shall be developed to distinguish fluid, 3.7.2.1 Color ke .- A color key to distinguish flows through the trap shall be pr
31、ovi Ta-+ e ;CO ors on the color key shall match the colors of the media being identified. 3.7.2.2 The color key shall be affixed to the front of the base. 3.8 Namepl ates and product markings. - 3.8.1 Nameplate and emblem.- A Government-furnished training aid nameplate and emblem, shall be attached
32、to each training aid in a location which will not interfere with the method of presentation in any manner. 3.8.2 Markings.- All components of the training aid mockup shall be identified by color coded name and number systems. number discs shall be attached directly on the component being identified
33、by the disc. comonent to which it is attached. The disc shall be engraved with the Wherever practical The background of the disc shall match the color of the identification marking and the engraved portion fil contrasting color. 3.8.2.1 The title of the training aid shall be 3.8.2.2 The intake and e
34、xhaust areas shall be “inlet“ and “outlet., II -z- ed with a strongly “Impul se Steam Trap“. den ti fi ed by ti tl es, 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-27027A b7 7777706 0387053 7 H 3.9 Workmanshi .- The training aid, including
35、 all parts and accessories, shall be + constructe and finished so that all components when assembled shall be accurately alined and inherently strong as a unit. Particular attention shall be given to neatness and thoroughness in the machining of parts and assemblies, finishing, and freedom of parts
36、from burrs and sharp edges. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection.- Unless otherwise specified in the contract or purchase order, the supplier is responsible for the performance of all inspection requirements as specified herein. specified, the supplier may utilize his ow
37、n or any facilities suitable for the performance of the inspection requirements specified herein unless disapproved by the Government. The Government reserves the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and
38、 services conform to prescribed requirements . Except as otherwise 4.2 Inspection.- The training aid shall be subjected to the following inspection, consisting of the examinations and tests specifed in 4.2.1 and 4.2.2, to determine compliance with the requirements of this spec- i fi cati on. 4.2.1 E
39、xaminations.- The training aid shall be examined for compli- ance with the fol 1 owing requi rements : (a) Material (b) Construction (c) Color (d) Finish (e) Identification and marking j (f) Preparati-on for del ivery (9) Workmanship. 4.2.2 Tests.- Each training aid shall be subjected to an operatio
40、nal test to ensure proper functioning and to demonstrate conformance with require- ments of 3.3, the test to be repeated after the necessary repair, replacement or adjustment Failure of any component shall be cause for rejection and require has been made. 5, PREPARATION FOR DELIVERY P- 5.1 Preservat
41、ion and packaginq. - Preservation and -packaging sha Level A or C as specified by the procuring acitvity. 1 be Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-29027A 63 = 9999906 0387059 O W I MI L -T- 2502 7k (TD ) 5.1.1 Level A.- For Level A,
42、 each training aid shall be preserved and packaged fornical and physical protection in accordance with MIL-P-116, Metho III. 5.1.2 Level C.- For Level C preservation and packaging shall conform to the manufacturers comercial practice. 5.2 Packing.- Packing shall be level A or C as specified by the p
43、rocuring acti vi ty . 5.2.1 Level A.- Units packaged in accordance with 5.1.1 shall be packed in exterior containers conforming to PPP-B-621 C1 ass 2, or PPP-B-601 , Styles A or B with steel banding. The gross weight shall not exceed the weight lim- itations of the shipping container. Each exterior
44、shipping container shall effect water resistance in accordance with MLL-L-10547. A case liner shall not be required where the package(s) and package dunnage have been treated to resist water. 5.2.2 Level C.- Units packaged as specified in 5.1.2 shall be packed in containeE3EEh will ensure acceptance
45、 by comon carrier and safe delivery at destination. carrier rules and regulations as applicable to the mode of transportation. tainer conforming to PPP-B-636, Class 2, designed to provide a compact and nonshifting load. Adequate cushioning, blocking and bracing shall be provided within shipping cont
46、ainers in a manner designed to prevent damage due to shock, vibration, impact or abrasion during shipment and storage. so that migrating solvents in cements, suchioning or components will not affect any part of the training aid. be marked in accordance with MIL-STD-129. Shipping containers shall com
47、ply with common 5.3 Physical protection.- Each training aid shall be packaged in a con- 5.3.1 Cushioning materials used shall be compatible with all finishes 5.4 Marking.- Interior packages and exterior shipping containers. shall 6. NOTES 6.1 Intended use.- The training aid, mockup, impulse steam tr
48、ap, is intended to be used by instructors as an aid in group training of Naval personnel, or ;as a self-training medium, in demonstrating the principles and theory of operation, construction, components, and nomencl ature of the impulse steam trap. 7 Provided by IHSNot for ResaleNo reproduction or n
49、etworking permitted without license from IHS-,-,-MIL-T-27027A 69 m 9779706 0387055 2 m 6.2 Ordering data.- Procurement documents should specify the following: (a) Title, number, and date of this specification (b) Procuring activity designation (see 1.1 .l) (c) Selection of applicable levels of preservation, packaging s and packing (see 5.1 and 5.2) 6.3 Definitions.- Definitions shall be in accordance with MIL-HDBK-220. CUSTODIAN
