Dfp Section 19 - General Penetration Guidelines

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DESIGN FOR PRODUCIBILITY MANUAL

SECTION 19 GENERAL PENETRATION GUIDELINES

REVISED PAGESTHE DATE ON EACH PAGE REPRESENTS THE LATEST REVISION.

Total number of pages in Section 19 is 27 consisting of the following:

i...................................9/22/03 ii..................................9/22/03 19-1.............................9/22/03 19-2.............................9/22/03 19-3.............................9/22/03 19-4.............................9/22/03 19-5.............................9/22/03 19-6.............................9/22/03 19-7.............................9/22/03 19-8.............................9/22/03 19-9.............................9/22/03 19-10...........................9/22/03 19-11...........................9/22/03 19-12...........................9/22/03 19-13...........................9/22/03 19-14...........................9/22/03 19-15...........................9/22/03 19-16...........................9/22/03 19-17...........................9/22/03 19-18...........................9/22/03 19-19...........................9/22/03 19-20...........................9/22/03 19-21...........................9/22/03 19-22...........................9/22/03 19-23...........................9/22/03 19-24...........................9/22/03 19-25...........................9/22/03

9/22/03THE INFORMATION CONTAINED HEREIN IS THE PROPRIETARY TRADE SECRET OF NATIONAL STEEL AND SHIPBUILDING COMPANY (NASSCO) AND MAY NOT BE DISCLOSED, REPRODUCED, OR TRANSFERRED TO OTHERS FOR ANY PURPOSE EXCEPT AS SPECIFICALLY AUTHORIZED BY THE NASSCO QUALITY PROCEDURE MANUAL OR IN WRITING BY AN AUTHORIZED OFFICER OF NASSCO. THIS MANUAL IS INTENDED FOR INTERNAL USE ONLY.

SECTION 19 GENERAL PENETRATION GUIDELINES

DESIGN FOR PRODUCIBILITY MANUAL

TABLE OF CONTENTS19. 19.1. 19.1.1. 19.1.2. 19.1.3. 19.1.4. 19.1.5. 19.1.6. 19.1.7. Introduction................................................................................................................................... 19-1 General Rules For Penetrations In Hull Structure ..................................................................... 19-1 General ............................................................................................................................ 19-1 Girders, Beams, And Stiffeners................................................................................................. 19-3 Decks And Bulkheads, Structural ............................................................................................. 19-4 Penetration In Strength EnvelopeCriteria................................................................................ 19-4 Penetrations In Floors And Longitudinal Girders In Double Bottoms........................................ 19-4 Side Shell Web Frames ............................................................................................................ 19-4 Flat Bar Ring Compensation..................................................................................................... 19-5

LIST OF FIGURESFigure 1 Definition of Depth ....................................................................................................................19-2 Figure 2 50mm Radius Region Near Shell ................................................................................................19-3 Figure 3 Girders, Beams, and Stiffeners - Single Row of Small Penetrations in 1/8 Span ..........................19-8 Figure 4 Girders, Beams, and Stiffeners - Large Opening ..........................................................................19-9 Figure 5- Structural Decks and Bulkheads..................................................................................................19-10 Figure 6 Strength Envelope.....................................................................................................................19-11 Figure 7 Double Bottom Floors and Longitudinal Girders ......................................................................19-12 Figure 8 Side Shell Web Frames, Penetration Conditions .......................................................................19-13 Figure 9 Girders, Beams, and Stiffeners - Ring Compensation.................................................................19-14 Figure 10 Girders, Beams, And Stiffeners - Doubler Compensation ........................................................19-15 Figure 11 Girders, Beams, and Stiffeners - Doubler and Ring Compensation..........................................19-16 Figure 12 Penetrations in Way of Weld Seams Preferred Methods .........................................................19-17 Figure 13 Penetrations in Way of Weld Seams Optional Method Due to Space Constraints ...................19-18 Figure 14 No Penetration Zone at Shear Strake/Stringer Strake ...............................................................19-19 Figure 15-Locations of Penetrations Above/Below Pillars and Stanchions ..................................................19-20 Figure 16 - Restricted Areas for Holes in Longitudinal Structural Bulkheads or Deckhouse Sides...............19-21 Figure 17 Restricted Areas for Holes Near Major Openings in Decks .....................................................19-22 Figure 18 Proximity of Sleeved and Lap Ring Penetrations .....................................................................19-23 Figure 19 Restricted Areas for Holes in Web Frames ..............................................................................19-24 Figure 20 25% of Bay Rule.....................................................................................................................19-25

9/22/03THE INFORMATION CONTAINED HEREIN IS THE PROPRIETARY TRADE SECRET OF NATIONAL STEEL AND SHIPBUILDING COMPANY (NASSCO) AND MAY NOT BE DISCLOSED, REPRODUCED, OR TRANSFERRED TO OTHERS FOR ANY PURPOSE EXCEPT AS SPECIFICALLY AUTHORIZED BY THE NASSCO QUALITY PROCEDURE MANUAL OR IN WRITING BY AN AUTHORIZED OFFICER OF NASSCO. THIS MANUAL IS INTENDED FOR INTERNAL USE ONLY.

i

DESIGN FOR PRODUCIBILITY MANUAL

SECTION 19 GENERAL PENETRATION GUIDELINES

LIST OF TABLESTable 1- Minimum Face Bar Compensation Rectangular Openings.........................................................19-5 Table 2- Minimum Face Bar Compensation Circular Openings...............................................................19-7

iiTHE INFORMATION CONTAINED HEREIN IS THE PROPRIETARY TRADE SECRET OF NATIONAL STEEL AND SHIPBUILDING COMPANY (NASSCO) AND MAY NOT BE DISCLOSED, REPRODUCED, OR TRANSFERRED TO OTHERS FOR ANY PURPOSE EXCEPT AS SPECIFICALLY AUTHORIZED BY THE NASSCO QUALITY PROCEDURE MANUAL OR IN WRITING BY AN AUTHORIZED OFFICER OF NASSCO. THIS MANUAL IS INTENDED FOR INTERNAL USE ONLY.

9/22/03

SECTION 19 GENERAL PENETRATION GUIDELINES

DESIGN FOR PRODUCIBILITY MANUAL

19 .1. 2.

INTRODUCTIONThese guidelines are for use on both commercial and Navy contracts. These guidelines are intended to provide the designer with information necessary to determine the following: Acceptable location and orientation of structural penetrations. Situations in which compensation for penetration of ship structure is not required. Situations in which compensation for penetration of ship structure is required. Situations in which penetration of ship structure is not permitted. Situations in which hull technical must be consulted.

3. 4.

These guidelines also provide information which will enable the designer to determine the type and size of compensation required in situations where consultation with hull technical is not required. These guidelines are not applicable to the design of the following: Large deck openings (hatches, access ). Archways or door openings. Clearance cuts allowing structural members to pass through. Lightening holes. Weld relief cuts. Snipes, drainholes, airholes, or clearance holes for erection butts. Seachest openings. Scupper openings.

19 .1.

GENERAL RULES FOR PENETRATIONS IN HULL STRUCTURE

19 .1.1.1.

GENERAL

Penetrations are not allowed in the following locations: a. b. c. d. Sheer strakes and strength deck stringer plates in the midships 3/5 length. (See Figure 14.) Web, girder, beam, or stiffener brackets. Web, girder, beam, stiffener flanges, or backing chocks. Pillars, stanchions or the web of a girder directly above or below a pillar or stanchion. (See Figure 15.)

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19-1

DESIGN FOR PRODUCIBILITY MANUAL

SECTION 19 GENERAL PENETRATION GUIDELINESe. 2. 3. Structural bulkheads directly above or below a pillar or stanchion. (See Figure 15.)

Penetrations in structural bulkheads above doors and arches should be avoided. (See Figure 16.) Penetrations in structural decks near the corners of large openings, such as hatches, and in longitudinal bulkheads near the ends of breaks in superstructure or deckhouses should be avoided. (See Figure 17.) Large openings are those that result in break of existing stiffening. Multiple penetrations in main transverse bulkheads should be minimized by employing pipe tunnels or utility trunks. No compensation is required for penetrations through non-structural steel bulkheads or flats, such as deckhouse decks, deckhouse interior bulkheads, or intermediate platforms. Square cornered penetrations are not allowed. Corners of non-circular penetrations must be well rounded, a minimum of 1/8 depth of opening, but not less than 25mm will be required (50mm within 450mm of side or bottom shell see Figure 2). Openings less than 150mm in depth will be fully radiused; i.e., circular or oval, but not rounded rectangles. Depth is as defined in Figure 1. All welding of steel used for compensation must be in accordance with regulatory body requirements and NASSCO welding procedures. Penetration dimensions