1.3 N6275822RCUS766 Specs.pdf

NRL TECHNICAL DATA REQUIREMENTS FOR THE RADIOGRAPHIC

INSPECTION OF SONAR DOME RUBBER WINDOWS (SDRW), REVISION 9,

January 2020.

1. INSPECTION AREA.

1.1. Due to the varying requirements for different splice designs, service histories, and inspection circumstances, the coverage required for each inspection is determined by NRL on a case-by-case basis. Contracting officers as well as the radiographic contractor are encouraged to contact NRL or IWS5B to verify coverage.

1.2. Inspection coverage is described based on the exposure identification chart shown in Figure 1. This chart establishes an identification scheme with exposures labeled in terms of the side (starboard or port), the column (A-E), and the row (1-10). Rows are determined by dividing columns into ten equal divisions of the distance between the upper and lower rubber lines, i.e. the marriage lines between the rubber dome and the hull. Columns consist of overlapping 14 x 17-inch film positions centered on pairs of parallel lines at multiples of 11 inches from the centerline. Film is oriented with the 17-inch dimension horizontal.

1.3. All measurements are made with reference to the outside surface of the SDRW at an allowed tolerance of +/- one inch. Note that the 11-inch lines on the charts are not limits to an exposure's coverage but serve to identify overlapping exposures centered on pairs of the lines. For example, film in column B is expected to cover an area from 8 to 25 inches from the centerline. Labeling of the

11-inch lines is described below.

1.4. Upon request, NRL will provide the inspection coverage requirement for an

SDRW by listing the individual exposures required from Figure 1, by reference to standard sets of exposures in Figures 2 through 5, or a by a combination of standard sets and individual positions. For example, inspection of a known damaged SDRW might require the Figure 5 coverage plus an exposure at location PB3 from Figure 1. For convenience, a list of the coverage requirements for all ships will be maintained on the NAVSEA Program Executive Office for

Mine and Undersea Warfare (IWS 5B) web site. See Contacts and Information

Sources, below.

2. LABELING OF INSPECTION AREA.

2.1. The inspection area shall be identified on the film by means of lead numbers and letters attached to the dome surface as follows. Lines of numbers at 2-inch intervals, beginning with 0 at the upper rubber line (URL), shall be placed at the

SDRW centerline and at multiples of 11 inches port and starboard for the extent of the coverage. Every 10 inches, the numbers shall be accompanied by a "P" for port side or an "S" for starboard side, and a "B", "C", or "D" to indicate the 22, 33, or 44-inch outboard number lines, respectively. (An "A" may be used for the

11-inch line but is not required.) Examples of the appearance of these number lines on the film are shown in Figure 6.

2.2. To minimize interference with the images, numbers appearing on the film shall be no greater than 3/8 inch in height.

2.3. To facilitate interpretation, the numbers and letters shall appear in the same orientation as in Figure 6. They shall be readable with the film image oriented to represent the SDRW as seen from its exterior, with starboard on the left and port on the right, regardless of the inspection procedure used (pierside or drydock).

3. OVERLAP OF INDIVIDUAL RADIOGRAPHS.

To ensure continuity of data, all radiographs shall be overlapped with adjacent radiographs a minimum of 1 inch.

4. IDENTIFICATION OF INDIVIDUAL RADIOGRAPHS.

4.1. In addition to the number interval markers described above, each radiograph shall be labeled with the inspection date and the ship's hull number (or name), using letters and numbers no greater than 3/8 inch in height.

4.2. No company names or logos, or information other than the inspection date and hull number and the number lines described in section 2, above, shall appear on the radiographs. This exclusion applies to information formerly required, such as

SDRW pressure and dome serial number.

4.3. Identification labeling may be done using lead numbers, film identification printer, or any other clearly readable permanent method.

4.4. The labels may appear along any edge of the exposures except the edges nearest to the 11-inch number lines, but should not interfere with any number line.

4.5. Labels shall be readable from the same side of the film as the number lines described in paragraph 2, with starboard on the left and port on the right.

5. RADIOGRAPH QUALITY REQUIREMENTS.

5.1. ASTM E94-84 shall serve as a guide to producing high quality radiographs.

5.2. Fourteen- by seventeen-inch Kodak Industrex type M or equivalent fine grain film shall be used.

5.3. Radiographic sensitivity shall be maintained at a high level, such that resolution of the 0.005 inch diameter wire from an ASTM E 747-97, set A, material grade

1, penetrameter is obtained in the thinnest part of the inspection area. At least one radiograph shall display this penetrameter placed at approximately 45 degrees to the vertical. The penetrameter shall be placed source side at any convenient location from 50 to 70 inches from the upper rubber line, if included in the inspection area. Otherwise, it shall be placed source side at the outermost exposure of the inspection area and as far from the URL as possible. Figures 2-5 indicate preferred penetrameter locations for the various standard coverages.

5.4. Lead oxide intensification screens are recommended as an aid to obtaining sufficient radiographic sensitivity.

5.5. At least one radiograph must be submitted for each required exposure. The double loading of cassettes is not required but may be done at the discretion of the contractor to obtain imagery within the acceptable density range.

5.6. Film density and contrast shall be maintained within the limitations defined by an

SDRW standard density strip traceable to a standard density strip approved by the Naval Research Laboratory.

5.7. Film density exceptions may be made as follows:

5.7.1. Areas of four square inches or less (on a 14 x 17 inch film) with densities outside the limits indicated on the standard density strip are acceptable.

5.7.2. Exposures located at those rows adjacent to the upper and lower rubber lines cover an area where the SDRW thickness change is greatest and uniform density is difficult to achieve. Up to 2/3 of these radiographs may be in the too light range, providing the remainder of the radiograph is acceptable.

5.8. Do not shoot through the Mylar film protecting the dome during drydock evolutions. The Mylar must be removed from both the film and source side.

5.9. Either high quality automatic processing or manual processing may be used. If manual processing is used, running water shall be used for film washing. The use of hypo eliminator is recommended to insure low levels of residual fixer on the radiographs. In order to satisfy the long-term storage requirements for the radiographs, the residual hypo (fixer) level on the film shall not exceed that indicated by stain patch #3 of the Kodak Hypo Estimator No. J-11, when the film is tested with Kodak Hypo Test solution HT-2. This stain test indicates an allowable maximum of 5 micrograms/square centimeter of residual thiosulfate ion.

6. INSPECTION DATA SHEET

An inspection data sheet containing the following information shall be included with the radiographs:

6.1. Contractor Company Name.

6.2. Inspection date.

6.3. Inspection facility and location (for example, "Southwest Marine, San Pedro, CA.")

6.4. NRL data requirement used (revision number).

6.5. Ship name or hull number.

6.6. SDRW serial number obtained from identification plate inside the dome.

6.7. List or chart indicating exposures provided, in terms of Figure 1. (A copy of one of the Figures in this document may be used.)

6.8. X-ray parameters: Tube potential (KV), source-to-object distance, spot size, and film type.

6.9. Notes describing any visual indications of damage or other anomalies.

6.10. Explanation for any deviation from this data requirement or from the required inspection area.

6.11. Point of contact: Name and phone number of contractor's on-site person in charge during the inspection.

7. QUALIFICATIONS OF INSPECTION CONTRACTOR

7.1. Radiographs will only be accepted from an NRL approved contractor or approved navy NDE facility.

7.2. Contractors are approved separately for drydock and pierside (underwater) inspections.

7.3. To become approved and eligible to conduct SDRW radiography, a contractor must request and obtain access to a ship and conduct a trial inspection at their own expense. Upon receipt of radiographs that satisfactorily comply with this data requirement and a copy of the contractor's written SDRW inspection procedure, NRL will recommend addition to the approved contractor list.

7.4. Previously approved contractors that have not provided a copy of their written

SDRW inspection procedure with NRL must do so to remain qualified.

7.5. Prospective and current SDRW radiography contractors are encouraged to visit the NRL Sonar Dome NDE Lab for orientation as to the goals and requirements of the inspection program.

7.6. The approved contractor list is maintained on the NAVSEA Program Executive

Office for Mine and Undersea Warfare (IWS 5B) web site, https://www.muwinfodesk.navy.mil for access by Navy facilities and contractors.

8. CRITERIA FOR RADIOGRAPH ACCEPTANCE AND REJECTION

8.1. Radiographs will be accepted that meet all of these requirements:

8.1.1. Provided by an NRL approved contractor, as defined above.

8.1.2. Satisfy the current inspection area requirement for the particular SDRW as determined and provided by NRL or posted on the IWS 5B web site.

8.1.3. Satisfy the image quality and identification requirements of this document.

8.2. Radiographs will be rejected, resulting in a recommendation to re-inspect the

SDRW, if there is insufficient coverage of the required inspection area (or inability to determine the coverage) due to any of the following:

8.2.1. Missing required exposures

8.2.2. Missing imagery on required exposures (areas not exposed).

8.2.3. Lack of film overlap where required.

8.2.4. Density or contrast outside the limits given in paragraph 5.6

8.2.5. Double exposures.

8.2.6. Excessive distortion or blurring of the image.

8.2.7. Missing film identification or any required labeling.

8.2.8. Artifacts of handling or processing that interfere with interpretation.

9. RADIOGRAPH SHIPPING INSTRUCTIONS

9.1. Radiographic contractors are required to contact NRL at least 48 hours before a scheduled inspection and immediately after the film has been shipped. Contact may be done by phone or e-mail. Please provide head technician name and contact information, ship name, and shipping tracking number.

9.2. Radiographs may be shipped by overnight express, if possible, to arrive at NRL or alternate address for interpretation on the next business morning, if possible.

Delivery of the processed x-ray film to NRL must be given a high priority because the results can impact drydock work schedules or ship deployments. The default shipping address is:

Naval Research Laboratory

Bldg. 207

4555 Overlook Avenue, S.W.

Washington DC 20375

Attention: Howard Schrader, Code 6126

9.3. Do not ship to NRL for Saturday delivery. NRL is closed on weekends, evenings, and federal holidays. If an urgent interpretation is required during these times, special delivery arrangements must be made through the NRL point of contact.

On-site (at the ship) interpretation can also be arranged if required by the Navy.

10. CONTACTS AND INFORMATION SOURCES

10.1. For individual SDRW inspection coverage requirements and other matters pertaining to SDRW radiography, contact NRL Code 6126:

Mr. Howard Schrader

Desk: 202-767-3039

E-mail: Howard.Schrader@nrl.navy.mil

10.2. For inspection results (also posted on the web site), required actions, and other sonar dome system inquiries contact NAVSEA IWS 5B:

Mr. Dustin Hoover

PEO IWS5B

AN/SQQ-89(V) In Service Manager APM

Desk: 757-492-4569

Dustin.Hoover@navy.mil

10.3. The approved radiography contractor list, the current version of this data requirement, and the recommended SDRW inspection schedules with coverage requirements are posted on the Program Executive Office for Mine and Undersea

Warfare (IWS 5B) web site, https://www.muwinfodesk.navy.mil. Instructions for obtaining an account and accessing this information are available from the NRL contact.

Starboard C L E D C B A A B C D E

44 33 22 11 0 11 22 33 44

SE1 SD1 SC1 SB1 SA1 PA1 PB1 PC1 PD1 PE1

SE2 SD2 SC2 SB2 SA2 PA2 PB2 PC2 PD2 PE2

SE3 SD3 SC3 SB3 SA3 PA3 PB3 PC3 PD3 PE3

SE4 SD4 SC4 SB4 SA4 PA4 PB4 PC4 PD4 PE4

SE5 SD5 SC5 SB5 SA5 PA5 PB5 PC5 PD5 PE5

SE6 SD6 SC6 SB6 SA6 PA6 PB6 PC6 PD6 PE6

SE7 SD7 SC7 SB7 SA7 PA7 PB7 PC7 PD7 PE7

SE8 SD8 SC8 SB8 SA8 PA8 PB8 PC8 PD8 PE8

SE9 SD9 SC9 SB9 SA9 PA9 PB9 PC9 PD9 PE9

SE10 SD10 SC10 SB10 SA10 PA10 PB10 PC10 PD10 PE10

Figure 1. SDRW radiograph exposure identification chart. Fourteen- by seventeen-inch exposures are oriented with the long dimension horizontal and centered between pairs of lines multiples of eleven inches from the centerline.

The upper rubber line (URL) and lower rubber line (LRL) are where the rubber dome meets the hull. This chart is used to identify and communicate the required inspection coverage as determined on a case-by-case basis by NRL. For convenience, the following figures 2 through 5 designate groups of exposures frequently required.

Port

Inches from SDRW centerline (locations of vertical lead number lines)

SD1 SC1 SB1 SA1 PA1 PB1 PC1 PD1

SD2 SC2 SB2 SA2 PA2 PB2 PC2 PD2

SA3 PA3

Figure 2. Standard minimum inspection area for drydock inspection of 5-ply

SDRWs. If required, additional exposures will also be designated in terms of

Figure 1.

* Recommended penetrameter location.

Port

SA4 PA4

SA5 PA5

SA6 PA6

SA7 PA7

SA8 PA8

SA9 PA9

SA10 PA10

SD1 SC1 SB1 SA1 PA1 PB1 PC1 PD1

SD2 SC2 SB2 SA2 PA2 PB2 PC2 PD2

Figure 3. Standard minimum inspection area for drydock inspection of 6-ply

SDRWs. Note the deviation from Figure 1 in the use of an alternate placement of the A column below row 2. These exposures are to be centered on the lines 11 inches from the centerline instead of between the 0 and 11 inch lines. If required, additional exposures will also be designated in terms of Figure 1.

* Recommended penetrameter location.

Port

SA3 PA3

SA4 PA4

SA5 PA5

SA6 PA6

SA7 PA7

SA8 PA8

SA9 PA9

SA10 PA10

SC1 SB1 SA1 PA1 PB1 PC1

SC2 SB2 SA2 PA2 PB2 PC2

Figure 4. Standard minimum inspection area for pierside (underwater) on-schedule inspection of SDRWs with no known damage.

* Recommended penetrameter location.

Port

SD1 SC1 SB1 SA1 PA1 PB1 PC1 PD1

SD2 SC2 SB2 SA2 PA2 PB2 PC2 PD2

Figure 5. Standard minimum inspection area for pierside (underwater) inspection of SDRWs that have known damage or are significantly overdue.

Additional exposures may be designated in terms of Figure 1.

* Recommended penetrameter location.

Port

10P

Figure 6. Examples of required radiograph identification markings typical of exposures PA1 (top) and PC2. Exposures are centered on pairs of lead number lines 11 inches apart. Every 10 inches, letters identify the port or starboard side of the dome (P or S) and the 22, 33, or 44 inch number lines

(B,C, or D). An ID strip along one edge contains the date and ship’s hull number. Note that all markings are readable from the same view, with port to the right (as if facing the SDRW). The diagram is not to scale.

20PB

20PC