Attachment_2__POT-TS1146_-_Weight_and_Center_of_Gravity.pdf

Test Procedure POT-TS1146

LARS BASE LSEC WEIGHT AND

CENTER OF GRAVITY DETERMINATION

of the

LARS Base Load Spreading Engineering Change (LSEC)

OII Document TM305122, Rev -for the

SUBMARINE RESCUE DIVING AND

RECOMPRESSION SYSTEM (SRDRS) PROGRAM

Prepared for:

NAVAL SEA SYSTEMS COMMAND

ADVANCED UNDERSEA SYSTEMS, PMS-394RR

SUBMARINE RESCUE DIVING AND RECOMPRESSION SYSTEM

Contract Number N00024-05-C-4208

Prepared by:

Oceaneering International, Inc.

7001 Dorsey Road

Hanover, MD 21076

SRDRS Document

DISTRIBUTION STATEMENT A;

Approved for public release; distribution is unlimited.

LARS Base LSEC Weight and CG Determination

TM305122 Revision -

Change Record ECO # Revision OQE Date 04143 - 2/24/10

1.0 Purpose

1.1 The purpose of this test is to obtain an accurate weight of all the components of the LARS Base LSEC and to determine the center of gravity (cg) of the four main assemblies and the whole LARS base in the installed configuration.

2.0 References and Prerequisites

2.1 References

NOTE

The most current revision of the referenced document shall be used to ensure up-to-date information is used for the performance of this test procedure. Indicate document revision in space provided.

2.1.1 NAVSEA Drawing 7412876 (-), Rev: _____; LARS Base LSEC General Arrangement

2.1.2 NAVSEA Drawing 7413009 (-), Rev: _____; A-Frame Template Kit

2.2 Prerequisites

The following prerequisites, or the applicable portions of, shall be satisfactorily completed prior to starting the performance of this test procedure.

2.2.1 For the weight and CG test in the installed configuration, verify all equipment has been installed in accordance with reference 2.2.1 and is ready to test; except for the cylinder and heel pin bearing blocks in reference 2.1.2 which are exempt from this test procedure and are not required to be installed. The installation fixtures (items #6 and 7 in reference 2.2.1), HPU support beams (items #17 and 23 in reference 2.2.1) and A-frame template kit (items #5 and 22 in reference 2.2.1) need not be assembled with the bases for this test. Fit all hardware into designated locations as shown in reference 2.2.1 and 2.1.2.

Signature Date

3.0 General Notes

3.1 All data observed during the performance of this test must be regarded as significant. If sufficient space is not provided for the recording of required test data, it should be made on an attachment to the test procedure.

3.2 Completed test procedures shall be completely filled in, dated, signed and/or initialed at each entry as indicated. If certain data called for is not recorded, an entry shall be made in Section 6.0 explaining the missing information.

3.3 Any substitution of components or equipment during the course of the test must carry complete documentation, i.e. cleanliness, calibration information, etc. This information shall be recorded in the applicable sections of the test procedure.

3.4 Discrepancies and/or omissions encountered during the performance of this test shall be reported to the engineer responsible for the component/system. The discrepancy or omission shall be recorded in Section 6.0.

3.5 Deviations from this test procedure or changes in the installation from approved drawings shall not be made without prior approval from the engineer responsible for the system. Deviations must be recorded in Section 6.0 and ultimately must be approved by all reviewers of the test procedure.

3.6 Where tolerances are specified for the test data, every effort shall be made to meet such tolerances. Where not possible, the engineer responsible for the system shall be notified immediately. Any changes to the specified tolerances will require concurrence from the engineer responsible for the system.

3.7 All minor changes made during the performance of the test must be recorded in Section

6.0. Actual changes shall be initialed and dated by the engineer responsible for the system.

4.0 Test Equipment, Consumables and Miscellaneous Topics

4.1 Calibrated Test Equipment

The following test equipment shall be in calibration prior to the performance of this test procedure.

Instrument Description Serial No. Cal Date Cal Due Date

Shipping scale 250 lb capacity

In-line load cell 2,000 lb capacity

Floor load cell* (R1) 12,000 lb capacity

Floor load cell* (R2)

Floor load cell* (R3)

Floor load cell* (R4)

* The floor load cells are Intercomp PT300.

4.2 General Test Equipment

4.2.1 Straps, slings and hoisting equipment capable of lifting LARS Base assemblies (5,000 lb or greater per lift point), installation fixtures (1,000 lb or greater per lift point), Bearing block adapter plates (800 lb per lift point) and HPU Support beams (<200 lb).

4.2.2 Suitable equipment to read load cell output if required.

4.2.3 Crane capable of lifting LARS Base assemblies (<11,000 lb estimated per base)

4.2.4 Miscellaneous shackles, pins, etc. necessary to attach straps, slings, load cells and other hoisting equipment to crane from items being hoisted.

4.3 Test Consumables

4.3.1 None.

4.4 Safety Precautions

4.4.1 Only personnel directly involved in the execution of this test shall be in the test area.

Personnel performing tests must not stand on or underneath items being hoisted. All applicable company safety regulations and requirements shall be followed during the performance of this test.

4.5 Hazardous Material/Waste Notes

4.5.1 None.

5.0 Test Procedures

Recommend at least one tag line be affixed to the corner of any item hoisted to allow control of orientation and sway.

Record raw data using units native to the measuring device. Include units of measurement in data record.

5.1 Weight and CG test of LARS Base assemblies

This test is to be completed for each of the four base assemblies (items 1, 2, 3 & 4 in Reference 2.1.1).

5.1.1 Arrange the four floor load cells on shop floor in a 377” X 55” rectangle as shown in Figure 1.

Note that dimensions are from the centers of the load cell. Mark each load cell with a number as noted in Figure 1.

5.1.2 Set all four floor load cells to read zero. Initial column in Table 3 when scales are zeroed.

5.1.3 Hoist LARS Base assembly using swivel hoist rings onto floor load cells as shown in Figure 2 for the outboard bases and Figure 3 for the inboard bases – note the orientation of the base and the numbering of the load cells. Disconnect all lifting equipment from swivel hoist rings and move away from LARS base.

5.1.4 Measure and record the distance from reference edge to Datum A (REFA) in Table 1. This is the distance from the edge nearest load cells 1 and 3 or the aft edge of the LARS base assembly (see Figure 2).

5.1.5 Measure and record the distance from reference edge to Datum B (REFB) in Table 2. This is the distance from the edge nearest load cells 3 and 4 (see Figure 3).

5.1.6 Read and record the output from all four floor load cells in Table 3.

5.1.7 Calculate the weight (Wb) and center of gravity in the lateral and longitudinal directions (CGx and CGy) using the following formulas, and record in Table 4:

Wb = R1+R2+R3+R4

CGx (inches) = (377” * (R2+R4) / Wb) + REFA

CGy (inches) = (55” * (R1+R2) / Wb) + REFB

5.1.8 Repeat Section 5.1 for three remaining LARS base assemblies.

Table 1 Base REFA

7412884 (Item #1 in Ref. 2.1.1)

7412881 (Item #2 in Ref. 2.1.1)

7412877 (Item #3 in Ref. 2.1.1)

7412887 (Item #4 in Ref. 2.1.1)

Table 2 Base REFB

7412884 (Item #1 in Ref. 2.1.1)

7412881 (Item #2 in Ref. 2.1.1)

Table 3 Base All scales zeroed (Initial)

Load cell #1 R1

Load cell #2 R2

Load cell #3 R3

Load cell #4 R4

7412884 (Item #1 in Ref. 2.1.1)

7412881 (Item #2 in Ref. 2.1.1)

Table 4 Base Weight

Wb Long. CG

CGx [inches] Lat. CG

CGy [inches] 7412884 (Item #1 in Ref. 2.1.1)

7412881 (Item #2 in Ref. 2.1.1)

5.2 Weight determination of Installation fixtures

This test is to be completed for the Forward Installation Fixture and the Aft Installation Fixture (items 6 & 7 in Reference 2.1.1).

5.2.1 Attach in-line load cell and slings to installation fixture as shown in Figure 4. Note that the forward installation fixture has two designated lift point shackles, the aft fixture does not. Use an appropriate attachment technique to attach the slings to the aft installation fixture.

5.2.2 Set the in-line load cell to read zero prior to attaching slings to crane. Initial column in Table 5 when scale is zeroed.

5.2.3 Attach lifting gear to crane.

5.2.4 Lift installation fixture approximately 1 foot above surface and record weight displayed by in-line load cell indicator into Table 5. Lower fixture back onto surface until slings are slack.

Table 5

Installation Fixture Scale zeroed (Initial)

Gross weight

7412891 (Item #6 in Ref. 2.1.1)

7412890 (Item #7 in Ref. 2.1.1)

5.2.5 Disconnect all lifting equipment from installation fixtures. Do not disconnect lifting equipment from crane.

5.2.6 Raise lifting gear above surface with crane and record weight of lifting gear indicated from in-line load cell display in Table 6.

Table 6 Installation fixture test Lifting gear weight

5.2.7 Subtract lifting gear weight from installation fixture weight and record in Table 7 below.

Table 7

Installation fixture Actual weight

5.2.8 Repeat Section 5.2 for remaining installation fixture.

5.3 Weight determination of Adapter plates

This test is to be completed for the cylinder pin and heel pin template (Ref. 2.1.2). The bearing blocks (items #3 and 7 in Ref. 2.1.2) are not weighed in this test, therefore only the adapter plates, swivel hoist rings and hardware are required to be installed.

5.3.1 Attach in-line load cell and slings to adapter plate as shown in Figure 5. Note that the adapter plate has four swivel hoist rings designated for lifting.

5.3.2 Set in-line load cell to read zero prior to attaching slings to crane. Initial column in Table 8 when scale is zeroed.

5.3.3 Attach lifting gear to crane.

5.3.4 Lift adapter plate approximately 1 foot above surface and record weight displayed by in-line load cell indicator into Table 8. Lower adapter plate back onto surface until slings are slack.

Table 8 A-Frame Template Scale zeroed

(Initial) Gross weight

7413009-1 (Ref. 2.1.2)

7413009-2 (Ref. 2.1.2)

5.3.5 Disconnect all lifting equipment from adapter plate swivel hoist rings. Do not disconnect lifting equipment from crane.

5.3.6 Raise lifting gear above surface with crane and record weight of lifting gear indicated from in-line load cell display in Table 9.

Table 9 A-Frame Template test Lifting gear weight

5.3.7 Subtract lifting gear weight from installation fixture weight and record in Table 10 below.

Table 10

A-Frame Template Actual weight

5.3.8 Repeat Section 5.3 for remaining adapter plate.

5.4 Weight determination of HPU Support beams and loose grating

This test is to be completed for items 17, 19, 20 and 23 in ref. 2.1.1. Note that for weighing items 19 and 20, weigh the total amount of each item (i.e. there are 2 pieces of item 19, therefore weigh both pieces simultaneously).

5.4.1 Set shipping scale to read zero prior to placing item on scale. Initial column in Table 11 when scale is zeroed.

5.4.2 Place item to be weighed onto shipping scale and record weight displayed into Table 11.

Remove item from scale.

Table 11

Item (Ref. 2.1.1) Scale zeroed (Initial)

Weight

7412988-101 (item #19) 2 pieces

7412988-102 (item #20) 4 pieces

7412986-2 (item #17)

7412986-1 (item # 23)

5.4.3 Repeat Section 5.4 for the remaining items.

5.5 Weight totals and CG location for LARS Base LSEC in the installed condition.

5.5.1 Copy each required longitudinal moment arm (CGx) and weight into Table 12.

5.5.2 Calculate weight by summing all the individual weights and record into Table 12:

Total weight = ∑ item weight

5.5.3 Calculate item moment arm by taking the product of item weight * item CGx = item moment, summing all the moments and dividing by the total weight. Subtract 36 inches from the total and record calculated CGx. The formulas are summarized below:

Item moment = item weight * item CGx

Total moment = ∑ item moments

Moment arm = Total moment / Total weight

LARS Base LSEC longitudinal CG location from heel pin centerline reference datum:

CGx = Moment arm – 36”

Table 12 Item (Ref. 2.1.1) Weight CGx [inches] Moment

7412884 (Item #1)

7412881 (Item #2)

7412877 (Item #3)

7412887 (Item #4)

7412891 (Item #6) 388.5

7412890 (Item #7) 37.8

7413009-1(item #5) 268.0

7413009-2 (item #22) 46.9

7412988-101 (item #19) - 2 pcs. 354.9

7412988-102 (item #20) - 4 pcs. 155.2

7412986-2 (item #17) 414.4

7412986-1 (item # 23) 414.4

Totals (Total Weight) (Moment arm) (Total Moment)

CGx of LARS Base LSEC in the installed condition --------------- -----------------------

6.0 Notes and Test Review

6.1 Notes. List any changes or deviations from this test procedure, along with justification.

6.2 Reviewer Notes. Test reviewer shall verify the test performed has met the objectives of the test procedure.

Reviewing Engineer’s Signature Date

Figure 1 - Load cell layout for LARS Base assemblies

Figure 2 - Outboard LARS Base assemblies load cell footprint (bottom view)

Figure 3 - Inboard LARS Base assemblies load cell footprint (bottom view)

Figure 4 –Installation fixture hoisting layout

Figure 5 - A-frame template hoisting layout