RIX Industries Flow Downs

Jun-99

Description:

APPENDIX L - DoD CONTRACTSSHOCK REQUIREMENTS

Clause:

I. GENERALThis appendix is applicable when invoked by the purchase order. This appendix sets forth shock definitions and grade designations, shocktesting requirements and procedures, dynamic design and analysis requirements, procedures, installation bolting requirements and equipmentdata submittal requirements.It is the intent of this appendix to set forth requirements that will provide shock resistance for non-contact underwater explosions. WhereMilitary or other applicable purchase specifications require shockproofing for other than non-contact underwater explosions, the requirementsof such specifications shall also apply.The fact that equipment may be covered by NavSea standard plans or Military Specifications does not exempt the vendor from hisresponsibility to meet the shock requirements of this appendix, including redesign for shock, if required, and testing for such equipment.The grade of shock resistance required for each item of equipment will be specified in the purchase order.During the guarantee period of the ship, the Department of the Navy, at its own expense, may conduct a full scale shock test to determine theperformance of ship systems and structures under moderate to severe attack conditions.The test will consist of exploding several charges at progressively decreasing distance abeam of the ship. The test will cause levels of shockthrough the ship which are less severe than those invoked in the purchase order.Only those failures which result from nonconformance with the requirements of the purchase specifications will be considered as theresponsibility of the vendor.Equipment may be furnished to meet the shock requirements of MIL-S-901C as modified by this Appendix via shock test extension approval ifthe equipment is identical to previously furnished equipment which was approved or extended to meet the requirements of MIL-S-901C asmodified by this Appendix.Equipment which requires a new shock test or dynamic shock analysis due to new design or changes from previously furnished equipmentmust meet the requirements of MIL-S-901D.When performing a shock test to the requirements of MIL-S-901D, an alternative Half Energy High Impact Shock Test may be performed forcertain cases as approved by Newport News Shipbuilding and the Government. The half energy tests shall be limited to items which areaircraft carrier unique and are installed at the following locations only: on or above the 4th deck forward of frame 200, or on or above 3rd deckaft of frame 200. Project Peculiar Document (PPD) No. 802-6337238 describes the half energy test method and applicable requirements.II. SHOCK DEFINITIONS AND GRADE DESIGNATIONSSystem. A system is an arrangement or combination of principal units and items necessary to perform a specific operational function orfunctions (Examples: Main propulsion system, refrigeration system, electronic systems, weapons control systems, hydraulic systems, etc.).Principal Units. Principal units are items of equipment, or assemblies of equipment or machinery which are major parts of a system such asdiesel-generator sets, air conditioning plants, switchboards, radio transmitters, steam generators, cranes or larger valves directly supported byships structure. Principal units consist of subsidiary components and sub-assemblies.Subsidiary Components. Subsidiary components are items or assemblies of equipment which form a part of, or are supported on, a principalunit. These would include such items as the diesel engine of a diesel-generator set, the electric motor of an air conditioning unit, the powersupply section of a radio transmitter, a switchboard circuit breaker, items which are attached to the steam generator or a valve supported bythe attached piping and similar items.Subassemblies. Subassemblies are parts or groups of parts of a subsidiary component or a system. This would include such items asthermometers, individual gages or meters, relays, resistors, and similar items. The distinction between subassembly and assembly or part asused herein may be different than that used in various equipment specifications. As used herein it is the smallest breakdown of a completesystem which will be accepted as a separate unit under this specification.Item. A complete and definable unit or a component of machinery, equipment or system. An item can be a principal unit, subsidiary componentor subassembly.Shock Loadings. Shock loadings referred to are those associated with the tests specified in MIL-S-901C or MIL-S-901D as applicable anddesign criteria specified herein.Shock resistance of machinery, equipment and systems is defined by grade as follows:Grade A. Grade A items are machinery, equipment and systems essential for the safety and continued combat capability of the ship andpersonnel. Shock testing, or design, of Grade A items shall demonstrate that the item will continue to perform its principal function withoutAppendix L - DoD Contracts -2- Rev. 6-99significant change in performance and that no portion of the equipment will come adrift or otherwise become a hazard to personnel atbattle stations, or to Grade A machinery, equipment or systems during and following application of shock loadings.Grade B. Grade B items are machinery, equipment and systems not required for the safety of the ship and personnel or the continuedcombat capability of the ship. Shock testing, or design requirements of Grade B items are the same as Grade A requirements except thatshock testing, or design need only demonstrate that no portion of the unit will come adrift or otherwise create a hazard to personnel atbattle stations, or Grade A systems or equipment. Failure of a Grade B unit to perform its principal function after the shock shall not because for rejection.Grade C. Grade C items are machinery, equipment and systems which do not have shock requirements, except that they must bearranged or located so as not to become a hazard.Hazard. An item constitutes a hazard if it is possible for it, or a portion of it (under shock loading), to strike and harm personnel at battlestations or any part of a Grade A system. In determining this possibility, the assumption shall be made that the item could be projected in anydirection as much as five feet before striking or rebounding onto a target. Consideration shall be given to the capability of the item to impair theoperability of any Grade A system or component or to injure personnel and to the relative weights of the item and any intervening structure. Anitem also constitutes a hazard if shock might cause an electrical short which could result in a failure or malfunction of a Grade A system, orrelease of any injurious fluid such as steam, hot water, toxic gas, diesel oil, radioactive fluids, JP-5, etc., which could affect the operability ofany other Grade A system or personnel located at battle stations.Additional definitions relating to shock requirements are found in MIL-S-901C or MIL-S-901D as applicable.III. SHOCK TESTING REQUIREMENTS AND PROCEDURESGrade A and B items weighing 60,000 pounds and less when installed on the shock testing apparatus shall be shock tested in accordancewith MIL-S-901D. This 60,000 pound weight limit includes the weight of the item in operating condition as well as the weight of foundationsand test fixtures required for the test. For additional information relating to shock testing, refer to NAVSHIPS 250-660-30, 900-185A, UERDReport 7-61, and NRL Letter Report 6260- 7A:ROB:Kep, by R. O. Belsheim, dated February 18, 1964.The purchase order will indicate, in the case of systems and principal units weighing over 60,000 pounds, how the assemblies shall be brokeninto subsidiary components and subassemblies for testing. Where such breakdowns are not provided, proposals from the vendor will beconsidered. The proposal should indicate the method of testing the subassemblies, including simulation of shipboard installation restrictions,and the method of analysis of connective equipment such as shafts and sub-bases.It is the intent of this appendix to use Shock testing to the maximum extent possible and use dynamic design procedure only where testing isimpractical.If an item weighing 60,000 pounds or less cannot be shock tested due to configuration, or center of gravity (see Fig. 2), the dynamic designanalysis procedure described herein shall apply.Where two or more items are installed on a common sub-base and the total installed operating weight is less than 60,000 pounds theassembly shall be shock tested in accordance with MIL-S-901D. Equivalent dummy weights may be used to simulate all but one of a group ofidentical units installed on a common sub-base.Shock Grade A and B valves and valve operators shall be tested and inspected for qualification in accordance with MIL-STD-798, Section 11.Valves and fittings shall be shock tested when pressurized with tap water to the primary service rating (the rating stamped on the valvebody) or to the actual operating pressure, whichever is greater.Delete Note 1 of Table V, Section 11.1 of MIL-STD-798 and substitute the following:"Relief, sentinel and safety valves shall be tested in the full closed position only. The valves shall be tested at the upper setting of theheaviest spring and lowest setting of the lightest spring for which the valve is designed. Valves designed for only one spring shall betested at the highest and lowest spring setting. The hydrostatic pressure during shock test shall be equal to the reseat pressure specifiedfor the spring setting being tested. This test qualifies the valve for the entire series of springs and spring settings for that size and design.""Relief, sentinel and safety valves which have previously been successfully tested at only one set pressure with any of a series of springsfor which the valve is designed will be acceptable as shock qualified valves or as a base for extension except that valves furnished toMilitary Specification MIL-V-22549 and to Revision D of MIL-V-20065 shall be qualified in accordance with the above paragraph. Alsorelief, sentinel and safety valves furnished to any Military Specification which have not been previously successfully tested or cannot becovered by an extension shall be qualified in accordance with the above paragraph."MIL-S-901C shall be modified as follows (paragraph numbers refer to MIL-S-901C):3.1.2.1 Hull Mounted. Delete "main deck" and substitute "water line".Deck Mounted. Delete "on main deck or above" and substitute "above the water line".3.1.4.1 Light Weight. Add "The total weight of equipment and test fixture shall not exceed 550 pounds."Appendix L - DoD Contracts -3- Rev. 6-993.1.4.2 Medium Weight. Delete "approximately 250 lbs to 6000 lbs" and substitute "up to approximately 6000 lbs".3.1.4.3 Heavy Weight. Delete "approximately 6000 . . . (see 4.2.3.3)" and substitute "up to approximately 60,000 lbs".3.2.2 Extension of Shock Tests. In the second line, delete "another" and substitute "a similar item". In line 7, after "concerned" add "forpropulsion plant equipment for which the equipment outline and assembly drawing are required to be submitted to NAVSEA forapproval and to the Supervisor of Shipbuilding, Newport News, for all other items." In the last line, delete "requests". After the firstline, add the following:(a) Requests for extension must be accompanied by supporting evidence which should include:1. Detailed drawings of tested and untested items, and delineation of the orientation of the tested and untested items in theship.2. A copy of the report of the shock test and post shock test reports upon which the requested extension is based.3. A detailed comparison of the differences in materials and design showing that the untested items have equal or greatershock resistance than the tested item.(b) Extensions will not be granted for equipment based upon tests in different weight classifications or on equipment by differentmanufacturers unless specific approval is obtained.(c) Extensions will not be granted for items where the original test report was marginal or unacceptable by present standards.(d) Extensions will not be granted whenever reasonable doubt exists in the area of the original shock test, the design or fabricationof the unit or the intended use of the equipment.(e) In case of doubt, general guidance as to allowable size spreads between tested and untested items may be obtained from thePurchaser.(f) Requests for extensions of equipment using resilient mounts shall be thoroughly documented to justify using such mounts; it isintended that equipment shall be designed to meet shock requirements without use of resilient mounts.(g) Shock test of valves may be extended to other sizes of the same design in accordance with the criteria as specified in MIL-STD798, Section 11.(h) Conditional shock test extensions may be granted for heavy weight items prior to the test of the item upon which the extension isto be based. In such cases, paragraphs (a)1, (a)3, (b), (e), (f) and (g) above shall apply. A final shock test extension will be grantedwhen a shock test report is submitted which certifies that the item tested has satisfactorily passed the shock test. The vendor shall,at his expense, make similar necessary corrections to the extended item as may be required to be made to the tested item due tothe results of the shock test.(i) Subject to satisfying the requirements of paragraphs (a)1., 2., 3., (c), (d), and (f), above, items whose degree of similarity aredifficult to assess, such as those listed below, may be extended from tests of generally similar components by reference tocalculations furnished by the vendor to show that the tested item and the untested item are designed by the same criteria and thatthe untested item is at least equal in shock resistance to the tested item. Typical items in this category are listed below:1. Piping system castings2. Tanks3. Ladders, gratings, floor plates, handrails and tool mountings4. Ventilation system components4.2.2.1 Type A, In line 3, delete "can" and substitute "will". In line 4, insert "as" between "be" and "specified".4.2.3.3 Heavy Weight Equipment, In lines 3 and 4 delete "the most severe condition . . . encountered" and substitute "the most severearrangement likely to be encountered on board ship". In lines 6-10, delete "The upper weight limit . . . machine" and substitute "The upperweight limit of 60,000 pounds is established for equipment, including its foundation and test fixture, on the floating shock platform and may bereduced depending on the individual test installation as it affects the stability of the floating shock platform".4.2.4 Test Procedure, In line 3, after "standstill" insert "valves such as gate valves shall be tested at design pressure in open and closedposition (check valves need not be tested in check position)". At end of paragraph, add "The medium weight shock testing machine may beused to shock qualify light weight equipment and their foundations. The heavy weight floating platform may be used to shock qualify mediumand light weight equipment and their foundations.When an equipment operates at different speeds, loads, capacities, or modes or when the function of the equipment capacities, or modes orwhen the function of the equipment is such that it may also be in a non-running (secured or standby) mode, the equipment is said to havemore than one significant operating mode.Appendix L - DoD Contracts -4- Rev. 6-99This specification is very general so as to cover the entire field of shipboard equipment and systems. In order to apply this specificationproperly and to avoid post-test disagreements, test procedures shall specify, describe or define all the features enumerated in 6.1. Forheavyweight tests only the test procedure shall be approved by the purchaser and the Government review and acceptance authority prior tothe shock test. Approval of the test procedure does not constitute approval of deviations from the requirements of this specification unlesssuch deviations are specifically identified when the procedure is submitted for approval.4.2.4.1.1 In first line, after "nine blows shall be applied" insert "for each significant operating condition." In line 6, after "circuitbreakers" insert"valves, motor".4.2.4.1.2 Delete paragraph entirely.4.2.4.2 For medium weight equipment, In line 3, after "as specified in" insert "the". In line 6, after "hammer" insert "drop". In line 8, after "thefixture used" insert "for the inclined orientation." After line 9, insert "The equipment may be rotated 90° on Figure 9-1 in lieu of using Figure 10-1 or 10-2.Where equipment has more than one significant operating mode, the series of blows shall be programmed to test the equipment in each ofthese modes. In this case, the mode of operation and the number and type of blows for each mode shall be as specified (see paragraph 6.1).A separate item of equipment may be submitted for each series or part of a series of six blows in excess of six blows, if desired by themanufacturer."4.2.4.3 For heavy weight equipment, Delete "Requirements . . . these facilities." and substitute "Requirements for equipment operation,orientation, inspection, and installation shall be as approved."4.2.6 Disposition of shock test equipment, In line 2, delete "and is to be retained by the Government".4.2.7.2 Delete and substitute: "The number of shock test and post shock test examination reports to be submitted by the vendor to thepurchaser shall be as specified in the purchase order. The Supervisor of Shipbuilding, Newport News will review the test reports submitted bythe purchaser and take appropriate action as to shock qualification."(1) For Light Weight and Medium Weight Equipment(a) A report by the shock test facility including NAVEXOS form 3373 and clear photographs of each test set-up and each instance ofdamage.(b) A report by the activity (manufacturer or other) performing the post shock test inspection and performance testing of the equipment.(c) A description of the corrective measures taken and recommendations as to proposed design changes which will correct anydeficiencies found during the post test inspection. (In certain cases, the Purchaser may accept the equipment as shock qualified on thebasis of the corrective design changes rather than to require retesting).(d) Certification of the report describing the shock test shall be by the facility performing the shock test.(e) Certification of the post shock test inspection and performance testing report shall be by the Government representative. TheGovernment representative need not witness all tests but it is desired that a sampling of the tests by each test facility be witnessed by theGovernment representative.(2) For Heavy Weight Equipment(a) As in (1)(a), above, except that NAVEXOS form 3373 is not applicable.(b) As in (1)(b), above.(c) As in (1)(c), above.(d) Certification of the report describing the shock test shall be by a Government representative who shall actually witness the test. Thetest procedure shall specify the activity whose representative will witness the inspection and testing.(e) As in (1)(e) above, except that the Government representative must witness the actual inspection and performance tests. The testprocedure shall specify the activity whose representative will witness the inspection and testing.4.2.7.3 Delete entirely.Add the following note to Figure 10-2, "12. This fixture is primarily intended to be used for dual (deck and bulkhead) mounted equipment. Incases where bulkhead-mounted equipment will not fit hereon due to length or configuration, the 30° fixture shown on Figure 10-1 shall beused."MIL-S-901D shall be modified as follows (paragraph numbers refer to MIL-S-901D):Appendix L - DoD Contracts -5- Rev. 6-991.2.5 Hull mounted is defined as: Equipment and foundations systems mounted directly to the basic hull structure (frames, structuralbulkheads below the waterline, and shell plating above the waterline).1.2.5 Deck mounted is defined as: Equipment and foundations systems mounted directly to decks, non-structural bulkheads, or tostructural bulkheads which are above the waterline.Post shock test inspection and post shock test functional testing of Grade A and B shock resistant equipment. For equipment which has notbeen previously successfully tested or is not covered by extension, the requirements for post shock test inspections and post shock testfunctional testing shall be as specified in the applicable military specifications, this appendix, and the purchase order.If not otherwise specified, the following minimum requirements shall apply to the post shock test inspection and functional testing.Inspections. In general, after shock testing, all equipment shall be disassembled and inspected for breakage, deformation, and misalignment.Areas highly stressed during shock response and areas suspected of yielding shall be liquid-penetrant or magnetic particle inspected forcracks. Critical tolerance areas shall be checked for proper operating clearances. Dimensions shall be as specified on the working plans.Equipment shall be considered to have failed the shock test if inspection reveals any condition that could prevent the equipment fromperforming its intended function, or could create a personnel hazard as a result of the shock.Functional Testing. After shock testing and inspection and prior to delivery to the Purchaser, the equipment shall be given suitable functionaland other tests as required to determine whether or not it meets the specified operational requirements. Functional testing shall be conductedto the maximum extent practical for the equipment to insure that the equipment meets the operational requirements of the purchase order afterhaving been shock tested.In general, the functional tests shall include but not be limited to:Checking the input/output of the component or equipment, its operating temperatures (bearings, coil windings, etc.), cyclic tests,etc., wherever appropriate, to determine compliance with design specifications.Hydraulic, pneumatic, and fluid systems equipment, etc., shall be hydrostatically tested at their test pressure to test for leaks, if notpreviously checked during shock testing. Electrical equipment shall be ground tested to detect breakdown of insulation. Rotating andreciprocating equipment shall be vibration tested to determine if the level of vibration meets design requirements by checking thevibration of the equipment while it is running at design speed.Equipment shall be considered to have failed the shock test if the equipment is unable to meet the specified functional requirements.When an item has passed the shock qualification requirements and all damage which may have occurred during the test has beencorrected, the vendor shall deliver to the Purchaser an item that is in all respects new equipment.For lightweight and mediumweight equipment as defined in MIL-S-901C or MIL-S-901D as applicable, all costs incurred because of shockqualification requirements such as transportation, test set-ups, shock testing, repair or replacement, retesting, post shock test inspection, postshock functional testing, repairs and reconditioning shall be borne by the vendor. This shall include costs for thorough inspection andcorrection of all damage to test samples which have successfully passed shock qualification tests and which are to be delivered to thePurchaser.Equipment weighing less than 6,000 pounds, which will not fit on the shock testing machines, shall be treated as heavyweight equipment andshall be tested on a floating shock platform as outlined for heavyweight equipment.Locations of Navy approved lightweight and mediumweight testing facilities will be furnished to the vendor upon request.For items categorized as heavyweight by MIL-S-901C as revised herein (6,000 to 60,000 pounds) or MIL-S-901D as applicable, all costsincurred because of shock qualification requirements shall be borne by the vendor and shall include but not be limited to the following:1. All transportation costs to and from the test facility.2. Test component installation and removal including temporary equipment associated therewith.3. Shock testing and associated instrumentation.4. Repair or replacement of equipment during or after heavyweight shock test.5. Total cost involved in retesting including retest itself and any additional transportation or test facility cost incurred due to initial failure ofthe equipment to pass shock tests.6. Post shock test inspection.7. Post shock functional testing.8. Repairs and reconditioning, post shock and otherwise.Appendix L - DoD Contracts -6- Rev. 6-999. All reports and procedures as required herein.10. The furnishing of personnel at the shock test facility required to assist in operation of and minor repairs to equipment during the shocktest.11. Test foundation, except as noted below. Disposition of the test foundation shall be as directed by the Purchaser.The Purchaser's responsibilities in heavyweight shock qualification shall be limited to providing the test foundation design.Heavyweight equipment will be designated as "hull mounted" or "deck mounted" in the purchase order. For hull mounted equipment, the testfoundation shall be mounted directly on the inner bottom of the floating shock platform. For deck mounted equipment, the test foundation shallbe mounted on a test fixture installed on the floating shock platform. The test fixture, which is used to simulate the shipboard deck, shall bedesigned to have a natural frequency as specified in the purchase order when the equipment is installed for testing.The vendor shall prepare a shock test procedure and a post shock test inspection and functional test procedure for all heavyweight equipment.These procedures shall be submitted to the Purchaser for approval no later than three months prior to the test date. The shock test procedureshall include, but not be limited to the system test conditions, definition of "Failure to Perform Specified Function," method of mountingequipment for test, and mode of equipment operation during test.Manufacturing schedules shall allow ample time for shock testing at the test site and still meet the Purchaser's delivery requirements.Equipment that fails to pass the initial shock tests will have to be rescheduled as the shock test facility scheduling permits.The vendor shall also allow sufficient time after the shock tests to allow for shipment back to the place of manufacture for post shockinspection, functional testing, and correction of all deficiencies so that the equipment may be delivered to the Purchaser on schedule.In order to verify proper charge weight and test geometry, at least one velocity meter shall be placed on the floating shock platform at the baseof the foundation or test fixture. The velocity meter instrumentation shall record the velocity-time history motion of the shock input to the baseof the foundation or test fixture. This data shall be included in the shock test report.The vendor shall furnish the following information to the test site with copy of forwarding letters to the Purchaser no later than three monthsprior to the scheduled test date:1. Three copies of the Equipment Data Sheet (Fig. 1) complete with estimated delivery date and required completion date.2. Drawings and/or Technical Manual showing:(a) Outline of equipment.(b) Sectional assembly of equipment.(c) Bedplates and mounting when applicable.(d) Plans showing all connections to the equipment such as piping, electrical conduit, air ducting, etc., which may affect the dynamicresponse of the equipment.IV. DYNAMIC DESIGN AND ANALYSIS REQUIREMENTS AND PROCEDURESWhere approved by NNS and NAVSEA or specified in the purchase order; Grade A and B items which cannot be shock tested shall bedesigned for shock by the Dynamic Design Analysis Method (DDAM). Criteria for dynamic analysis and related stress analysis criteria, asspecified by publication, NAVSEA 0908-LP-000-3010 shall be used. Guidance for dynamic analysis of specific items will be provided by theshipbuilder, as required. The static shock calculations shall also be included in the submittal of the concurrent dynamic analysis as requiredbelow. The dynamic analysis report shall be submitted to the Purchaser no less than four (4) months prior to scheduled delivery of the item tothe Purchaser. Where calculated stresses exceed the allowed stresses, as defined below, or other unsatisfactory conditions are predicted as aresult of the dynamic analysis, the Vendor shall provide a dynamic analysis of a satisfactory design including deficiencies. This informationshall be submitted as a part of and at the same time as the dynamic analysis report. NAVSEA and the Purchaser will determine if it isdesirable to correct the deficiencies and any such corrections will be made at the expense of the Purchaser.The mathematical model report shall contain sufficient information to permit a meaningful dynamic analysis directly from the informationcontained therein. Supporting data for the dynamic shock analysis review, and the mathematical model report and dynamic analysis formatsand contents shall be in accordance with the requirements of NAVSEA 0908-LP-000-3010.Motion inputs for dynamic analysis will be as specified in the purchase order.Strength and rigidity of foundations shall be suitable to withstand shock loads (where required) and to distribute them into the structure of thehull.In general, possible shock damage shall be minimized. If misalignment would not interfere with operation of equipment, permanentdeformation of the foundation is preferable to damage to the equipment or the hull. In any case, deformation should take the form of bucklingor bending of local structure, rather than permitting the equipment to tear loose from its attachment. Foundation structure shall be proportionedto give a reasonable and uniform stress distribution, permitting maximum absorption of energy through elastic deformation. Corners and othercauses of stress concentration shall be avoided. Brittle materials, such as cast iron, shall not be used. Under vertical shock forces, belts shallbe stressed in tension rather than shear, insofar as practicable.Appendix L - DoD Contracts -7- Rev. 6-99All foundations which support Grade A and B equipment shall be assigned the same shock grade as the supported equipment.Buffers used to limit deflection under shock loading are subject to the same requirements as foundations.The design of hold-down bolts shall be based upon the elastic design motion inputs specified in the purchase order. The item held down may,in general, be considered as a rigid body for those cases in which the bolts have not been, or cannot be, included in an item's shock test.Where the hold down bolts have been tested with the item and are acceptable for the intended installation in accordance with Mil. Spec. MILS-901, then these bolts will be considered satisfactory for shipboard installation.Each principal direction of shock loading (vertical, athwartship, and fore-and-aft) shall be considered separately. Continuous operatingstresses shall be added to calculated shock stresses. Comparison of calculated and allowable stresses will generally determine designacceptability. However, it shall also be assured that column buckling will not occur, and that deflection of foundations must not lead tooverloading of flexible couplings or other displacement-critical components.Hold-down bolts for equipment which has been qualified for shock on the basis of shock testing shall possess strength characteristics at leastequal to those of hold-down bolts utilized during shock tests of the equipment. If the type of bolting used during the shock test is not known,the vendor shall establish and install hold-down bolts based upon the equipment elastic design motion inputs specified in Table 2 of DesignData Sheet DDS 072-1. The definitions of "hull-mounted" and "deck-mounted" as contained in Section B of DDS 072-1 do not apply. Instead,the definitions are modified as previously described in this appendix.V. INSTALLATIONBolts for holding down Grade A and B equipment to their foundations or subbases shall be installed in holes no greater than the followingsizes:Nominal Boltdiameter (inches)Maximum Diameterof hole (inches)3/4 and smaller Nominal bolt diameter + 1/32Larger than 3/4 Nominal bolt diameter + 1/16The above applies to clearance holes only. Where alignment must be maintained, fitted bolts or other positive methods should be used.When equipment is supported on Distributed Isolation Material (DIM), the permissible diametral clearance between bolt and hole shall beincreased by twice the wall thickness of the bushing r