Design Calculation Offshore Basket

8/18/2019 Design Calculation Offshore Basket

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©M.I.Z 2014, PT Besmindotama Semesta BTS‐OB‐05

DESIGN APPROVAL

OFFSHORE BASKET(14300 MM L x 1200 MM W x 1400 MM H)

MODEL: BTS-OB-05

REVISION: 0

PT. BESMINDOTAMA SEMESTA

Jl. POJ KALIMALANG DS. CIBUNTU, CIBITUNG

BEKASI – JAWA BARAT 17520

INDONESIA

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CONTENTS

TITLE ………………………………………………………………………….... i

1. CONTENTS ……………………………………………………………………. ii

2. GENERAL ……………………………………………………………………… 1

3. DIMENSION AND RATING ………………………………………………….. 2

4. MATERIAL AND CONSTRUCTION ……………………………………….... 3

5. PRESERVATION ………………………………………………………………. 4

6.

MARKING …………………………………………………………………….. 7

7. TESTING AND INSPECTION ……………………………………………….... 8

8. DESIGN CALCULATION FOR LIFTING SETS AND PADEYES …............... 10

OFFSHORE BASKET REFERENCE DRAWING :

Drawing Title:

OFFSHORE BASKET

(Dim. 14300 MM L x 1200 MM W x 1400 MM H)

Drawing Number:

BTS-119-WI-140530-01

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1. GENERAL

1.1.

Operational Environment

The offshore basket is designed and manufactured for repeated use in

transport of goods or equipment, handled in open seas, to, from or

between fixed and floating installations and ships.

It is able to withstand extremes of temperature range -20oC thru 80oC

without effect on the offshore basket strength or weather proofness.

1.2. Standard and Regulation

The offshore basket is built in accordance with technical requirements

of the EN 12079 Part 1 & 2:2006 and DNV 2.7-1:2013

1.3. Design approval of the offshore basket by Bureau Veritas system will be

applied.

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2. DIMENSIONS AND RATINGS

2.1. External Dimensions

Length : 14,300 (±5) mm

Width : 1,200 (±5) mm

Height : 1,530 (±5) mm

2.2. Internal Dimension

Length : 14,100 (±5) mm

Width : 1,000 (±5) mm

Height : 1,200 (±5) mm

2.3. Forklift Pocket

Width (internal dimension) : 288 mm

Height (internal dimension) : 108 mm

Center Distance : 2,050 mm

2.4. Inside Cubic Capacity

Capacity : 19.70 m3

2.5. Ratings

Maximum Gross Weight : 14,700 kgs

Maximum Payload : 10,500 kgs

Estimated Tare Weight : 4,200 kgs

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3. MATERIAL AND CONSTRUCTION

3.1. Bottom Rail

Material : ASTM A.500 Grade B or equivalent quality

Geometry : Rec tangle hollow sec tion

Size : 200 x 100 x t 6.0 mm

3.2. Corner Post

Material : ASTM A.500 Grade B or equivalent quality


Size : 100 x 100 x t 6.0 mm

3.3. Top Rail

Material : ASTM A500 Grade B or equivalent quality


Size : 150 x 100 x t 6.0 mm

3.4. Intermediate Post


Geometry : Square hollow sec tion

Size : 100 x 100 x t 6.0 mm

3.5. Bracing


Geometry : Square hollow sec tion

Size : 100 x 100 x t 6.0 mm

3.6.

Forklift PocketMaterial : ASTM A.36 or equivalent quality

Geometry : Rec tangular hollow sec tion

Size : 250 x 120 x t 6.0 mm

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3.7. Base Plate

Material : ASTM A.36 or equivalent quality

Geometry : Hot rolled steel plate

Size : t 10.0 mm

3.8. Pad Eye

Material : J IS G 3106 SM 490 YA

Geometry : High tensile strength plate

Size : t 32.0 mm

3.9. Pad Eye Cheek Plate

Material : ASTM A.36 or equivalent quality

Geometry : Hot rolled steel plate

Size : t 6.0 mm

3.10. Properties of Steel Material

Chemical Composition (%)

Material C Si Mn P S

ASTM A.36 0.14 0.18 0.71 0.016 0.005

ASTM A.500 Grade B 0.05 0.02 0.84 0.010 0.008

J IS G 3106 SM 490 YA 0.22 0.55 1.70 0.040 0.030

Mechanical Properties

Material Yield Strength min.

(kg/mm2)

Tensile Strength min.

(kg/mm2)

Elongation min.

(%)

ASTM A.36 250 400 23ASTM A.500 Grade B 317 400 23

J IS G 3106 SM 490 YA 355 490 19

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4. PRESERVATION

4.1.

Surface preparation of steel part

4.1.1. Prior to assembly

All steel parts are pre-shot blasted and coated.

4.1.2. After assembly

- Components : All welded areas of exterior and interior of

assembled offshore basket.

- Process : Manual shot blasting.

- Cleaning : All dirt, dust shot ball etc. to be completely removed

before the basket enters the paint booth.

4.2. Painting

- The offshore basket is airless sprayed outside using zinc rich primer

and acrylic top coat, which is the converted at 60oC.

- The offshore basket is airless sprayed inside using zinc rich primer

and epoxy polyamide finish, which is the converted at 60oC.

- The paint system and thickness are as follows:

Part DescriptionD.F.T

(Microns)

Outside Epoxy zinc rich primer (Including shop primer) 40

Epoxy polyamide zinc phosphate primer 40

Polyurethane top coat 40

Total D.F.T (min.) 120

Inside Epoxy zinc rich primer (Including shop primer) 40

Epoxy polyamide zinc phosphate primer 40

Polyurethane top coat 40

Total D.F.T (min.) 120

Bottom Epoxy zinc rich primer (Including shop primer) 40

Wax. Based under coating 200

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5. MARKING

All offshore basket are to be marked in accordance with the EN 12079-

1:2006, requirements as well as certain customers marks and logos as

indicated below.

The marking applied on the offshore basket will be self adhesive decal of

cast vinyl and seven years life.

Unless otherwise specified, all markings included in this guideline are to be

in decal.

1.

Owner’s code and serial number

The offshore basket serial number has to be placed in accordance with

owner’s requirements.

2. Weight

The weight of the offshore basket is positioned on the right hand door in

such a manner that no information is hidden by door hardware. The

weight shown is the maximum gross weight of the Tool Box, the tare

weight of the container and maximum designed cargo weight. All

weights are to be expressed in kilograms and pounds.

3. Owner’s logo

The owner’s logos are to be placed in accordance with owner’s

requirements.

4. Other

Other markings are affixed in accordance with owner’s requirements.

5. Identification plate.

Identification plate is riveted on the one of the door by stainless steel

blind rivets.

The rivets heads and periphery of the plate are sealed by sealant

except bottom area.

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6. TESTING AND INSPECTION

1. Proto-type Container

Prototype container manufactured in accordance with this

specification will be tested according to the standard classification

container procedures. The deflection of the components during test

are measure with scaled and dial gauges. Upon completion of the

test, the basket will certified by the soc iety with a test report showing

the deflection and variations within the criteria of the permissible

values spec ified in the society’s rules.

2. Testing item and load

(R) Gross Weight = 14,700 kgs

(P) Pay Load = 10,500 kgs

(T) Tare Weight = 4,200 kgs

(S) Sling Weight = 70 kgs

ITEM TEST LOAD

1.

Lifting from the top pad eye

- All pad eye

- Two pad eye diagonally

2.5 x R = 36,750 kgs

1.5 x R = 22,050 kgs

2. Lifting from the forklift pocket 1.6 (T + S) = 6,832 kgs

3. Vertical Impact Test

- Drop test 1 x R = 14,700 kgs

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3. Production Line Container

Every container is manufactured under effective quality control

procedure to meet the specified standards. After completion, all

containers are subject to dimension check, door operation check

and weather proof test. The offshore basket will be inspected by the

surveyor of the classification society and identified with the

appropriate society seal when they meet the standards of this

specification.

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7. DESIGN CALCULATION FOR LIFTING SETS AND PAD EYE

1. Objective

To determine quad assembly (master link & intermediate), sling &

shackle.

To determine minimal required breaking strength of lifting sets and pad

eye strength.

2. Design Reference

EN 12079 Part 1 & 2:2006 and DNV 2.7-1:2013

3. Basic of Design

Lifting Point (n) n = 4

Number of Intermediate Link n1 = 2

Number of Master Link n2 = 1

Tare Mass (T) T = 4200 kg

Payload (P) P = 10500 kg

Rating or Maximum gross mass (R) = T+P R = 14700 kg

Standard acceleration of gravity (g) g = 9.8 m/s 2

Angle of sling leg from vertical (ß) ß = 45º

Material Padeye J IS G 3106 SM 490 YA

Yield Strength (C) = (Re) C = Re = 355 N/mm 2

Conclusion:

If R = 14,700 kg, find the minimum required working load limit (WLLmin)

WLLmin =19,200 kg

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Ma ster Link Assem b ly Dim en sion:

Select a master link assembly with a WLL of at least 19,200 kg

Master Link size minimum1-3/8”

Sl ing Leg Dim en sion:

WLLsl =3cos β

WLLmin =

o45cos3

19200 = 9,050 kg

Select a wire rope with a WLL of at least 9,050 kg

Wire rope size minimum 28 mm

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Sha c kle Dim ension:

WLLs =

3cos β

WLLmin =

o

45cos3

19200 = 9,050 kg

Select a shackle with a WLL of at least 9,050 kg.

Shackle size: 9.5 T (1-1/8”)

Shackle Information:

Shackle Type G-2130 S-2130

Working Load Limit WLLs = 9500 kg

Nominal Size Shackle Shackle 1-1/8”

Pin diameter B = 31.8 mm

Shackle Width A = 46 mm

Shackle Height C = 108 mm

- Pad eye hole diameter (max.) :DH = B + 6% B

: 31.8 + (0.06 x 31.8) = 34 mm

- Pad eye thickness (min.) :T = A x 75%

: 46 x 0.75 = 34 mm

Resulting Sling Force on the pad eyes: RSF =o

Cosn

xRxg

45)1(

3

=o

Cos

x x

453

8.9147003= 203731 N

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Pa d Eye Stre ng th:

Padeye Information:

Hole Diameter : DH = 33 mm

Padeye Radius : H = 65 mm

Check Plate Radius : R = 40 mm

Plate Thickness : t1 = 32 mm

Total Thickness : t2 = 44 mm

- Tear-out Stress

Ri =

112

3

DHxt xHxt

xRSF

Ri =x32332x65x32

3x203731

= 197 N/m m 2

Re

Ri=

355

197= 0.55 (maximum 0.85) OK

- Contact Stress

Ri = 23.7 x2DHxt

RSF

Ri = 23.7 x33x44

203731= 280 N/m m 2

Re

Ri=

355

280= 0.79 (maximum 0.85) OK

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Design Calculation Offshore Basket

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