Design Calculation Offshore Basket
Short Description
Design Calculation Offshore Basket...
Description
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 i ©M.I.Z 2014, PT Besmindotama Semesta
BTS‐OB‐05
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
ii ©M.I.Z 2014, PT Besmindotama Semesta
BTS‐OB‐05
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.
1 ©M.I.Z 2014, PT Besmindotama Semesta
BTS‐OB‐05
2. DIMENSIONS AND RATINGS 2.1. External Dimensions Length
:
14,300 (± 5) mm
Width
:
1,200 (± 5) mm
Height
:
1,530 (± 5) mm
Length
:
14,100 (± 5) mm
Width
:
1,000 (± 5) mm
Height
:
1,200 (± 5) mm
Width (internal dimension)
:
288 mm
Height (internal dimension)
:
108 mm
Center Distance
:
2,050 mm
:
19.70 m3
Maximum Gross Weight
:
14,700
kgs
Maximum Payload
:
10,500
kgs
Estimated Tare Weight
:
4,200
kgs
2.2. Internal Dimension
2.3. Forklift Pocket
2.4. Inside Cubic Capacity Capacity 2.5. Ratings
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BTS‐OB‐05
3. MATERIAL AND CONSTRUCTION
3.1. Bottom Rail Material
: ASTM A.500 Grade B or equivalent quality
Geometry
: Rectangle hollow section
Size
: 200 x 100 x t 6.0 mm
3.2. Corner Post Material
: ASTM A.500 Grade B or equivalent quality
Geometry
: Rectangle hollow section
Size
: 100 x 100 x t 6.0 mm
3.3. Top Rail Material
: ASTM A500 Grade B or equivalent quality
Geometry
: Rectangle hollow section
Size
: 150 x 100 x t 6.0 mm
3.4. Intermediate Post Material
: ASTM A500 Grade B or equivalent quality
Geometry
: Square hollow section
Size
: 100 x 100 x t 6.0 mm
3.5. Bracing Material
: ASTM A500 Grade B or equivalent quality
Geometry
: Square hollow section
Size
: 100 x 100 x t 6.0 mm
3.6. Forklift Pocket Material
: ASTM A.36 or equivalent quality
Geometry
: Rectangular hollow section
Size
: 250 x 120 x t 6.0 mm
©M.I.Z 2014, PT Besmindotama Semesta 3
BTS‐OB‐05
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
: JIS G 3106 SM 490 YA
Geometry
: High tensile strength plate
Size
: t 32.0 mm
3.9. Pad Eye Cheek Plate
3.10.
Material
: ASTM A.36 or equivalent quality
Geometry
: Hot rolled steel plate
Size
: t 6.0 mm
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
JIS G 3106 SM 490 YA
0.22
0.55
1.70
0.040
0.030
Mechanical Properties Material
Yield Strength min. Tensile Strength min. Elongation min. (kg/mm2) (kg/mm2) (%)
ASTM A.36
250
400
23
ASTM A.500 Grade B
317
400
23
JIS G 3106 SM 490 YA
355
490
19
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BTS‐OB‐05
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: D.F.T (Microns) Outside Epoxy zinc rich primer (Including shop primer) 40 Part
Inside
Bottom
Description
Epoxy polyamide zinc phosphate primer
40
Polyurethane top coat
40
Total D.F.T (min.)
120
Epoxy zinc rich primer (Including shop primer)
40
Epoxy polyamide zinc phosphate primer
40
Polyurethane top coat
40
Total D.F.T (min.)
120
Epoxy zinc rich primer (Including shop primer)
40
Wax. Based under coating
200
5 ©M.I.Z 2014, PT Besmindotama Semesta
BTS‐OB‐05
5. MARKING All offshore basket are to be marked in accordance with the EN 120791:2006, 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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BTS‐OB‐05
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 society with a test report showing the deflection and variations within the criteria of the permissible values specified 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
2.5 x R
= 36,750 kgs
- Two pad eye diagonally
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
1xR
©M.I.Z 2014, PT Besmindotama Semesta 7
= 14,700 kgs
BTS‐OB‐05
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.
©M.I.Z 2014, PT Besmindotama Semesta 8
BTS‐OB‐05
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)
Number of Intermediate Link
n1 = 2
Number of Master Link
n2 = 1
Tare Mass (T)
T=
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/s2
Angle of sling leg from vertical (ß)
ß = 45º
Material Padeye JIS G 3106 SM 490 YA Yield Strength (C) = (Re)
n=4
4200 kg
C = Re = 355 N/mm2
Conclusion:
If R = 14,700 kg, find the minimum required working load limit (WLLmin) WLLmin =19,200 kg
©M.I.Z 2014, PT Besmindotama Semesta 9
BTS‐OB‐05
Master Link Assembly Dimension: Select a master link assembly with a WLL of at least 19,200 kg Master Link size minimum1-3/8”
Sling Leg Dimension: WLLsl =
WLLmin 19200 = = 9,050 kg 3cosβ 3 cos 45 o
Select a wire rope with a WLL of at least 9,050 kg Wire rope size minimum 28 mm
©M.I.Z 2014, PT Besmindotama Semesta 10
BTS‐OB‐05
Shackle Dimension: WLLs =
WLLmin 19200 = = 9,050 kg 3cosβ 3 cos 45 o
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 = =
©M.I.Z 2014, PT Besmindotama Semesta 11
3xRxg (n 1)Cos45o
3 x14700 x9.8 = 203731 N 3Cos 45 o BTS‐OB‐05
Pad Eye Strength:
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 =
3 xRSF 2 xHxt1 DHxt1
Ri =
3x203731 = 197 N/mm2 2x65x32 33x32
197 Ri = = 0.55 (maximum 0.85) Re 355
OK
- Contact Stress Ri = 23.7 x
RSF DHxt2
Ri = 23.7 x
203731 = 280 N/mm2 33x44
280 Ri = = 0.79 (maximum 0.85) Re 355
OK
©M.I.Z 2014, PT Besmindotama Semesta 12
BTS‐OB‐05
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