1、MIL-STD-798 NOTICE L MI m 7979733 0.080669 3 m MIL-STD 798 (SHIPS) 16 December 1965 MILITARY STANDARD NONDESTRUCTIVE TESTING, WELDING, QUALITY CONTROL, MATERIAL CONTROL AND IDENTIFICATION AND HI-SHOCK TEST REQUIREMENTS FOR PIPING SYSTEM COMPONENTS FOR NAVAL SHIPBOARD USE Provided by IHSNot for Resal
2、eNo reproduction or networking permitted without license from IHS-,-,- MIL-STD-798(SHIPS) 16 December 1965 DEPARTMENT OF THE NAVY BUREAU OF SHIPS WASHINGTON, D. C. 20360 Nondestructive Testing, Welding, Quality Control, Material Control and Identification and HI Shock Test Requirements for Piping Sy
3、stem Components for Naval Shipboard Use MIL-STD-798(SHIPS) 1. This standard has been approved by the Bureau of Ships and is published to establish the require- ments for nondestructive testing, welding, quality control, material control and identification and HI shock test requirements for piping sy
4、stems components for Naval shipboard use. 2. Use of this standard by activities under the cognizance of the Bureau of Ships shall be mandatory only when: (a) Specific directives have been received from the Bureau of Ships. ) Standard is referenced in applicable Ships Specifications or piping system
5、component specifica- tions. Until specifically invoked by (a) or (b), the standard will be considered only as an advisory document fur- nished for guidance purposes only in the procurement of the piping system components. 3. Recommended corrections, additions or deletions should be addressed to the
6、Chief, Bureau of Ships, Department of the Navy, Washington, D. C. 20360. ii Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-778 NOTICE 1 MI m 7779711 0080671 1 m . MIL-STD-798(SHIPS) 27 November 1968 NOTICE-1 MILITARY STANDARD NONDESTRUCTIVE
7、TESTING, WELDING, QUALITY CONTROL, MATERIAL CONTROL AND IDENTIFICATION AND HI-SHOCK TEST REQUIREMENTS FOR PIPING SYSTEM COMPONENTS FOR NAVAL SHIPBOARD USE TO ALL HOLDERS OF MIL-STD-798(SHIPS) 3, AS OUTLINED IN THE SPECIAL INSTRUCTIONS ON BACK OF COVER PAGE OF MIL-STIL798 (SHIPS) ONE PAGE OF !ED3 STA
8、NDARD HAS BEEN REVISED. THE REVISED PAGE, AND PAGE IT SUPERSEDES IS LISTED IN PARAGRAPH 4. 2. SUPERSEDED PAGE SHOULD BE REMOVED AND THE REVISED PAGE SHOULD BE INSERTED IN ITS PROPER LOCATION. 3 . SUPERSEDED PAGE MUST E RETAINED FOR REFERENCE PURPOSES, NEW PAGE DATE SUPERSEDED DATE PAGE 9 27 November
9、 1968 9 16 December 1965 10 16 December 1965 Reprinted without change 5 RETAIN THIS NOTICE AND INSERT BEFORE THE TABLE OF CONTENTS, 6, Holders of MIL-STD-98(SHIPS) will verify that page change indicated in paragraph 4 has been entered. The notice page will be retained as a check sheet. This issuance
10、, together with appended pages is a separate publication. Each notice is to retained by stocking points until the Military Standard is completely revised or cancelled. Preparing activity: Navy - SH (Project MISC-N579) Provided by IHSNot for ResaleNo reproduction or networking permitted without licen
11、se from IHS-,-,-NIL-STD-77B NOTICE 3 NI W 7777733 00BOb72 3 m 1 . 1.1 1.2 2 . 3 . 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3. 12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 3.20 3.21 4 . 5 . 6 . 7 . 8 9 . 10 . 11. MIL-STD-798(SHIPS) 16 December 1965 CONTENTS Page SCOPE AND APPLICABILITY . Scope Applicab
12、ility . REFERENCED DOCUMENTS . DEFINITIONS Ferrous component primary service rating Nonferrous component primary service rating Flanges . Size Finished surface Actual seating surface Linear defects . Body Valve bonnet . Wall thickness . Nozzles . Forged . Purchaser Specifications and drawings Manufa
13、cturer . Vendor . Procedures Objective evidence . Auxiliary equipment . RADIOGRAPHY . MAGNETIC PARTICLE INSPECTION DYE PENETRANT INSPECTION WELDING . QUALITY CONTROL . MATERIAL CONTROL . MATERIAL IDENTIFICATION HIGH-IMPACT SHOCK TESTS Pressure containing sealing surface . Included seating surface .
14、. 1 . 1 . 1 . 1 . 2 . 2 . 2 . 2 . 2 2 . 2 . 2 . 2 . 2 . 2 . 2 . 2 . 2 . 2 n . ZI n . a . 2 . 2 . i . 3 . 3 3 . 3 . 3 . 4 . 4 . 5 . 6 . I . 9 TABLES Table I Size and pressure rating 3 Table II Acceptance criteria . 3 Table III Magnetic particle inspection and acceptance criteria . 4 Table IV Dye pene
15、trant inspection and acceptance criteria 4 Table V HI shock tests 9 Table VI Sizes to be shock tested 10 iii Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-778 NOTICE 3 MI m 7997733 0080673 5 m MIL-STD-798(SHIPS) 16 December 1965 1. SCOPE AN
16、D APPLICABILITY 1.1 Scope. “This standard covers the requirements for nondestructive testing, welding, quality con- trol and identification and HI shock for piping system components. It does not apply to primary side com- ponents of nuclear ships. 1.2 Applicability. “When this standard is referenced
17、 in a specification (ships specification, piping system component specification or purchase order), all sections are applicable. If only certain sections are applicable, they shall be as specified by the purchasing activity. 2. REFERENCED DOCUMENTS 2.1 The following documents of the issue in effect
18、on date of invitation for bids or request for proposal, form a part of this standard to the extent specified herein. SPECIFICATION MILITARY MIL-S-901 - Shock Tests, HI (High-Impact); Shipboard Machinery, Equipment and Systems, Requirements for. STANDARDS MILITARY MIL-STD-27 1 - Nondestructive Testin
19、g Requirements for Metals. MIL-STD-278 - Welding and Allied Processes for Machinery for Ships of the MIL-STD-775 - X-Ray Standards for Welding Electrode Qualification and Quality United States Navy. Conformance Tests. PUBLICATIONS NAVSHIPS 250-537-1 - Radiographic Standards for Bronze Castings. NAVS
20、HIPS 250-537-2 - Radiographic Standards for Brohze Castings for Radium, Cobalt (60). and High Voltage X-Rays (1000 KVP and Over). (NAVSHIPS 250-537-1 available as P. B. #131854 and 250-537-2 available as P. B. #151351 from the Clear- ing House for Federal Scientific and Technical Information, Depart
21、ment of Commerce,2585 Port Royal Road, Springfield, Virginia 22151.) NAVSHIPS 250-692-13 - Radiographic Standards for Steel Castings - Supplement 1 for Nickel- Copper, Copper-Nickel and Aluminum Bronze Alloy Castings (Copies of Supplement 1 should be obtained from Chief, Bureau of Ships, Code 634, D
22、epartment of the Navy, Washington, D. C. 20360). 0900-003-8000 - Surface Inspection Standards for Metals. (Copies of specifications, standards, drawings, and publications required by suppliers in connection with specific procurement functions should be obtained from the procuring activity or as dire
23、cted by the contracting officer. f 2.2 Other publications. -The following document forms a part of this specification to the extent spec- ified herein. Unless otherwise indicated, the issue in effect on date of invitation for bids or request for proposal shall apply. AMERICAN SOCIETY FOR TESTING AND
24、 MATERIALS (ASTM) E71-64 - Industrial Radiographic Standards for Steel Castings Up to 2 Inches in Thickness. (Application for copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, Pa. 19103. ) 1 Provided by IHSNot for ResaleNo reproduction or n
25、etworking permitted without license from IHS-,-,-MIL-STD-798 NOTICE I MI 99799LL 0080674 7 m MIL-STD-798(SHIPS) 16 December 1965 3, DEFINITIONS 3.1 Ferrous component primary service rating. “Ferrous component primary service is the hot pressure rating. 3.2 Nonferrous component primary service rating
26、. -Nonferrous component primary service rating is the cold pressure rating. 3.3 Flanges, -All sections beyond the backface surface. All other sections of the flange (hub end) shall be handled in the same manner as and “fittings. 3.4 Size, “Size refers to the component nominal size. 3.5 Pressure cont
27、aining sealing surface. “Pressure containing sealing surfaces are all of the sur- - faces which come into direct contact with the sealing member. 3.6 Finished surface. -Finished surfaces are the surfaces which are finished machined, in their entirety. 3.7 Actual seating surface. -Actual seating surf
28、ace is the portion of a valve or trap seat or seating face which comes in direct contact with a mating face, including 1/8 inch on either side of the direct con- tact area. 3.8 Included seating surface, “Included seating surface is the portion of a valve or trap seat or seating face which borders th
29、e actual seating face, is finished machined in the same manner as the actual seating face, but does not come into contact with the mating seat or face. 3.9 Linear defects, -Linear defects are the defects which have a length to width ratio equal to or ex- ceeding three which cannot be defined as poro
30、sity or shrink, where the length equals l/8 inch or more. 3.10 Body. -The body is the main pressure enclosure including bonnet and cover attachment area. 3.11 Valve bonnet, -Valve bonnet includes all pressure containing sections from the body attachment area up to but not including the packing gland
31、 area. 3.12 Wall thickness. -The wall thickness is the section thickness under examination or otherwise being discussed or worked. 3.13 Nozzles. - (a) For weld end components, that section from the end preparation back to the interface be- (b) For flanged end components, that section from the flange
32、 backface back to the interface tween the inlet and outlet and the main body section. between the inlet and outlets and the main body section. 3.14 Forged. -Forged, where the term is used, includes items manufactured from wrought materials as well as those manufactured from forgings. 3.15 Purchaser.
33、 -The purchaser is the shipyard or government stocking agency. 3.16 Specifications and drawings. -Specifications and drawings are those issued by the United States Government, 3.17 Manufacturer. “Manufacturer is the activity responsible for the design of the part or component, except in those cases
34、where the Government provides the design. In such cases, the manufacturer is the activity producing the item and as such is the responsible party for satisfactory operation. 3.18 Vendor. “Vendor is the activity providing materials or parts to the manufacturer. 2 Provided by IHSNot for ResaleNo repro
35、duction or networking permitted without license from IHS-,-,-MIL-STD-778 NOTICE L MI m 77777LL 0080b75 7 m MIL-STD-798(SHIPS) 16 December 1965 3.19 Procedures. “Procedures are the actual steps taken, forms used, and so forth, in the manu- facture and production of the item with regard to quality con
36、trol, material control and identification applied to the product. 3.20 Objective evidence. “Objective evidence is documentation or other physical proof which indicates the acceptability- and correctness of any part or assembly. 3.21 Auxiliary equipment. “Auxiliary equipment includes strainers, line
37、desuperheaters , air and steam desuperheaters , pipe fittings, manifolds and unions. 4. RADIOGRAPHY 4.1 Radiographic examination shall be performed in accordance with MIL-STD-271. It shall be applied to all castings for bodies, bonnets, covers, tailpieces, discs for quick opening valves or relief va
38、lves, flanges and fittings covered in this standard, when both the size and primary pressure rating of the com- ponent equal or exceed the values listed in table I. The acceptance criteria for this examination shall be in accordance with table II. Item Valves, flanges, fittings, and auxiliary equipm
39、ent (except for hydrogen and oxygen services) Valves, flanges, fittings and auxiliary equipment (for hydrogen and oxygen services) Ferrous Nickel base, copper or aluminum bronze Tin Bronze I Table I - Size and pressure rating Material Primary service rating Size Ferrous Over 2 inches, ips and non- 3
40、00 psi and higher Over 3000 psi 1/2 inch ips and larger ferrous Ferrous and non- 550 psi and higher 1/2 inch ips and larger ferrous Table II - Acceptance criteria Wall thickness Less than 1 inch 1 inch and over Less than 1 inch Over 1 inch 1/2 inch and less Over 1/2 inch Acceptance standard NAVSHIPS
41、 250-692-13 or ASTM-E7 1 NAVSHIPS 250-692-13 and Supplement 1 thereto and ASTM-E7 1 NAVSHIPS 250-537-1 and NAVSHIPS 250-537-2 Acceptance class Class 1 Class 2 Class 2 Class 3 Class 2 with no area restriction or shrink- age Class 3 except shrinkage maybe class 4 B, hIAGNETIC PARTICLE INSPECTION 5.1 M
42、agnetic particle inspection shall be performed in accordance with MIL-STD-278 on ferrous com- ponents only. Inspection shall be performed in accordance with table III. Acceptance criteria shall be in accordance with table II. Inspection shall be applied when both the size and primary pressure rating
43、 exceed the values shown and shall be performed after rough machining and final heat treatment. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-778 NOTICE I MI m 77777II 0080b7b O M MIL-STD-798(SHIPS) 16 December 1965 Table III - Magnetic p
44、article inspection and acceptance criteria Item All items Valves, auxiliary equipment (bodies only) Size 1/2 inch and larger 1/2 inch and larger (see acceptance criteria) Primary pressure rating 225 psi and higher 600 psi and higher Material Cast, forged Cast, forged Area to be inspected Butt weld e
45、nds Pressure con- taining sur - faces (see acceptance criteria) Acceptance criteria Remove all defects 2 inches and smaller; remove all linear defects Over 2 inches; ex- ternal and acces- sible internal sur- face-remove all linear defects 6. DYE PENETRANT INSPECTION 6.1 Dye penetrant inspection shal
46、l be performed in accordance with MIL-STD-278. Inspection shall be performed in accordance with table IV when both the size and pressure rating exceed the values shown and after final heat treatment. Acceptance criteria shall be in accordance with table IV. Table IV - Dye penetrant inspection and ac
47、ceptance criteria i Location (surface) to be inspected Butt weld end preparations Actual seating surfaces Included seat- ing surfaces Pressure sealing con- taining sur- faces Size 1/2 inch and larger All All All Primary pressure rating Material 225 psi and A 11 higher Nonferrous All A 11 All All All
48、 Swface condition Finished machined Finished machined Finished machined Finished machined Acceptance criteria Remove all defects Remove all defects Remove all linear defects Remove all defects 7. WELDING 7.1 The following shall comply with all the requirements of MIL-STD-278 and shall apply to both
49、production and repair welding on castings hd fdrgings. (a) Welding procedu-e approvals. (b) Welder qualifications. (c) Nondestructive testing of welds. 7.2 Welding shall not be performed until the applicable procedures have been approved and the applicable welders have obtained the necessary qualification approvals. 7.3 Radiographic, magnetic particle and dye penetrant inspection of welds as required shall be per- formed in accordance with
