Project TAM DAO 05 JACK-UP RIG

Doc. Tittle CALCULATION FOR SWAGE HOLDING TANK

Doc. Number GK002-PR-CL-011 Rev. A Date 30/9/2014

CALCULATION FOR SWAGE HOLDING TANK

Total 10 pages included this pape

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 Project TAM DAO 05 JACK-UP RIG

Doc. Tittle CALCULATION FOR SWAGE HOLDING TANK

Doc. Number GK002-PR-CL-011 Rev. A Page 2 of 10

I. INTRODUCTION

This document describes calculation of Swage sludge tank, which is to be installed on jack-up drilling unit TAM DAO 05.

II. DESIGN PARAMETER

Table 2-1: Design parameter

DESIGN DATA
Item Description Design data Remark
1 Tank type Rectangular
Length 2500 mm
2 Tank geometry Width 2100 mm
Height 2000 mm
3 Volume 3 m3
External 0 Kpa
4 Design pressure
Internal 114 Kpa
Max 45 ºC
5 Design temperature
Min 10 ºC
6 Hydraulic leakage test pressure 118 Kpa
7 Operation pressure 118 Kpa
8 Operation temperature 38 ºC
9 Service Contents Black water
10 Liquid specific gravity 721 Kg/m3
11 Internal Corrosion Allowance 0 mm
12 External Corrosion Allowance 0 mm
13 Radiographic Test None
14 Joint Efficiency 1
15 External surface painting Yes
16 Internal surface coating Yes
17 Insulation None
18 Fire proofing(By other) None
19 DOSH inspection & Certification None
20 Code Stamping None
21 Third Party None
22 Tank geometry None
OTHER LOADS
Item Description Design data Remark
1 Empty weight of vessel Kg
2 Weight of vessel at operation condition Kg
3 Weight of vessel at test condition Kg
4 Wind reaction N/A m/s
5 Earthquake Specification N/A
 Project TAM DAO 05 JACK-UP RIG

Doc. Tittle CALCULATION FOR SWAGE HOLDING TANK

Doc. Number GK002-PR-CL-011 Rev. A Page 3 of 10

III. CALCULATION

III.1. Calculation for side plate of tank

III.1.1. Material used

ABS-AH36 ← Tank's Shell material

121000.000 ← S: Maximum allowable stress @ 45 ºC (Kpa)
L75x75x7 ← Tank's top Edge stifferning angle
L100x75x10 ← Tank's vertical stifferning angle
L75x75x7 ← Tank's horizontal stifferning angle

III.1.2. Calculation for shell @ (Height X Length) faces

Picture 3-1-2: Shell @ (Height X Length) faces

III.1.2.1. Calculation for Shell thickness @ (Height X Length) faces

Number of vertical stiffenners = 5

Number of horizontal stiffenners = 2
Maximum distance between horizontal stiffenner, a = 1000 mm
Maximum distance between vertical stiffenner, b = 500 mm
Ratio, a/b = 2
Thus, The constant β = 0.34
The constant α = 0.06

a) Thickness of of shell @ (Height X Length) face

Required thickness of shell @ (Height X Length) face

𝛽∗𝑃𝑑
tr = b* + Ca = 8.9544 mm
𝑆∗𝐸
Where:
Internal pressure design, Pd = 114.14 mm
Joint Efficiency, E = 1 mm
Corrosion allowance, Ca = 0 mm
Selected thickness of shell @ (Height X Length) face
ts = 10.00 mm
Thus, selected thiskness of shell @ (H X L) face is adequate. ts > tr OK
 Project TAM DAO 05 JACK-UP RIG

Doc. Tittle CALCULATION FOR SWAGE HOLDING TANK

Doc. Number GK002-PR-CL-011 Rev. A Page 4 of 10

b) Check deflection of shell @ (Height X Length) face

Maximum deflection of shell @ (H X L) face plate required

𝛼∗𝑃𝑑∗𝑏4
𝑌𝑑𝑚𝑎𝑥 = = 2.1407 mm
𝐸𝑚 ∗𝑡𝑠 3
Where:
Elastic Modulus of material: Em = 2E+08 Kpa
Allowable deflection of shell @ (H X L) face plate
Ydp = 5 mm
Thus, deflection of shell @(H X L) face plate is adequate. Ydp > Ydmax OK

Therefore, Selected plate thickness is satisfactory.

III.1.2.2. Calculation for stiffener and top edge stiffening @ (Height X Length) face

Maximum load
Wmax = Pd*a/2 = 57.071 N/mm
a) Calculation for top edge stiffening
Reaction at top Edge stiffening
Rtop = 0.3*Wmax = 17.121 N/mm
Minimum required moment of inertia for top Edge stiffening
𝑅𝑡𝑜𝑝∗𝑏4
𝐼𝑚𝑖𝑛 = 192∗𝐸 = 2787.4 mm4
𝑚 ∗𝑡𝑠

Edge stiffening angle L75x75x7 . It's moment of inertia Istiff. = 511965 mm4

Thus, Using top Edge stifferning angle is adequate. Istiff. > Imin OK

b) Calculation for vertical stiffener

Required section modulus of vertical stiffener
0.1284 ∗ 𝑊𝑚𝑎𝑥 ∗ 𝑎 ∗ 𝑏
𝑍𝑟𝑒𝑞. = = 30280 mm3
𝑆
Vertical stiffening angle L100x75x10 . It's section modulus. Zstiff. = 50697 mm3

Thus, Using vertical stifferning angle is adequate. Zstiff. > Zreq. OK

c) Calculation for horizontal stiffener

Reaction at horizontal stiffener's bottom edge
Rhor. = 0.7*Wmax = 39.949 N/mm
Minimum required moment of inertia for horizontal stiffener
𝑅
ℎ𝑜𝑟. ∗𝑏4
𝐼𝑚𝑖𝑛 = 192∗𝐸 = 6503.9 mm4
𝑚 ∗𝑡𝑠

Horizontal stiffening angle L75x75x7 . It's moment of inertia Istiff. = 511965 mm4

Thus, Using horizontal stifferning angle is adequate. Istiff. > Imin OK

 Project TAM DAO 05 JACK-UP RIG

Doc. Tittle CALCULATION FOR SWAGE HOLDING TANK

Doc. Number GK002-PR-CL-011 Rev. A Page 5 of 10

III.1.3. Calculation for shell @ (Height X Width) faces

Picture 3-1-3: Shell @ (Height X Width) faces

III.1.3.1. Calculation for Shell thickness @ (Height X Width) faces

Number of vertical stiffenners = 4

Number of horizontal stiffenners = 2
Maximum distance between horizontal stiffenner, a = 1000 mm
Maximum distance between vertical stiffenner, b = 525 mm
Ratio, a/b = 1.9048
Thus, The constant β = 0.34
The constant α = 0.06

a) Thickness of of shell @ (Height X Width) face

Required thickness of shell @ (Height X Width) face
𝛽∗𝑃𝑑
tr = b* + Ca = 9.4022 mm
𝑆∗𝐸
Where:
Internal pressure design, Pd = 114.14 mm
Joint Efficiency, E = 1 mm
Corrosion allowance, Ca = 0 mm
Selected thickness of shell @ (Height X Width) face
ts = 10.00 mm
Thus, selected thiskness of shell @ (H X W) face is adequate. ts > tr OK

Check deflection of shell @ (Height X Width) face

Maximum deflection of shell @ (H X W) face plate required
𝛼∗𝑃𝑑∗𝑏4
𝑌𝑑𝑚𝑎𝑥 = = 2.602 mm
𝐸𝑚 ∗𝑡𝑠 3
Where:
Elastic Modulus of material: Em = 2E+08 Kpa
Allowable deflection of shell @ (H X W) face plate
Ydp = 5 mm
Thus, deflection of shell @(H X W) face plate is adequate. Ydp > Ydmax OK

Therefore, Selected plate thickness is satisfactory.

 Project TAM DAO 05 JACK-UP RIG

Doc. Tittle CALCULATION FOR SWAGE HOLDING TANK

Doc. Number GK002-PR-CL-011 Rev. A Page 6 of 10

b) Calculation for vertical stiffener and top edge stiffening @ (Height X Width) face

Maximum load
Wmax = Pd*a/2 = 57.071 N/mm
Calculation for top edge stiffening
Reaction at top Edge stiffening
Rtop = 0.3*Wmax = 17.121 N/mm
Minimum required moment of inertia for top Edge stiffening
𝑅𝑡𝑜𝑝∗𝑏4
𝐼𝑚𝑖𝑛 = 192∗𝐸 = 3388.1 mm4
𝑚 ∗𝑡𝑠

Edge stiffening angle L75x75x7 . It's moment of inertia Istiff. = 511965 mm4

Thus, Using top Edge stifferning angle is adequate. Istiff. > Imin OK

Calculation for vertical stiffener

Required section modulus of vertical stiffener
0.1284 ∗ 𝑊𝑚𝑎𝑥 ∗ 𝑎 ∗ 𝑏
𝑍𝑟𝑒𝑞. = = 31794 mm3
𝑆
Vertical stiffening angle L100x75x10 . It's section modulus. Zstiff. = 50697 mm3

Thus, Using vertical stifferning angle is adequate. Zstiff. > Zreq. OK

Calculation for horizontal stiffener

Reaction at horizontal stiffener's bottom edge
Rhor. = 0.7*Wmax = 39.949 N/mm
Minimum required moment of inertia for horizontal stiffener
𝑅ℎ𝑜𝑟. ∗𝑏4
𝐼𝑚𝑖𝑛 = = 7905.5 mm4
192∗𝐸𝑚 ∗𝑡𝑠

Horizontal stiffening angle L75x75x7 . It's section modulus. Istiff. = 511965 mm4

Thus, Using horizontal stifferning angle is adequate. Istiff. > Imin OK

III.2. Calculation for roof plate of tank

III.2.1. Material used

ABS-AH36 ← Tank's Top material

121000.000 ← S: Maximum allowable stress @ 45 ºC (Kpa)
L75x75x7 ← Tank's top stifferning angle

III.2.2. Calculation roof load

 Project TAM DAO 05 JACK-UP RIG

Doc. Tittle CALCULATION FOR SWAGE HOLDING TANK

Doc. Number GK002-PR-CL-011 Rev. A Page 7 of 10

III.2.2.1. Dead load of roof

Roof weight
Lrw = 412.13 Kg
Roof structure weight
Lrsw = 116.6 Kg
Roof's other weight
Lrow = 100 Kg
Dead load of roof
LDw = 628.73 Kg
III.2.2.2. Life load of roof

Life weight of roof

LLw = 1.5 Kpa
III.2.2.3. Roof load

Lroof = LDw + LLw = 2.674 Kpa

III.2.3. Calculation roof plate

Picture 3-2-3: Top plate

III.2.3.1. Calculation for Roof thickness

Maximum distance between horizontal stiffenner, a = 1250 mm
Maximum distance between vertical stiffenner, b = 1050 mm
Ratio, a/b = 1.1905
Thus, The constant β = 0.34
The constant α = 0.06

a) Thickness of of roof plate

Required thickness of roof plate

𝛽∗𝐿𝑟𝑜𝑓𝑓
tr = b* + Ca = 2.8784 mm
𝑆∗𝐸

Where:
Joint Efficiency, E = 1 mm
Corrosion allowance, Ca = 0 mm
 Project TAM DAO 05 JACK-UP RIG

Doc. Tittle CALCULATION FOR SWAGE HOLDING TANK

Doc. Number GK002-PR-CL-011 Rev. A Page 8 of 10

Selected thickness of roof plate

troof = 8.00 mm
troof > tr OK

Check deflection of roof plate

Maximum deflection of roof plate required

𝛼∗𝐿𝑟𝑜𝑜𝑓 ∗𝑏4
𝑌𝑑𝑚𝑎𝑥 = = 1.9053 mm
𝐸𝑚 ∗𝑡𝑟𝑜𝑜𝑓3
Where:
Elastic Modulus of material: Em = 2E+08 Kpa
Allowable deflection of roof plate
Ydp = 4 mm
Ydp > Ydmax OK

Therefore, Selected plate thickness is satisfactory.

b) Calculation for stiffener of roof

Maximum load
Wmax = Lroof*b/2 = 1.4041 N/mm
Reaction at middle stiffener of roof plate
Rmstiff. = 0.7*Wmax = 0.9829 N/mm
Check moment of inertia for roof's stiffener

Minimum required moment of inertia for roof's stiffener

𝑅𝑚𝑠𝑡𝑖𝑓𝑓. ∗𝑏4
𝐼𝑚𝑖𝑛 = 192∗𝐸 = 3889.9 mm4
𝑚 ∗𝑡𝑟𝑜𝑓𝑓

Roof's stiffener angle L75x75x7 . It's moment of inertia Istiff. = 511965 mm4

Istiff. > Imin OK

Check section modulus for roof's stiffener

Required section modulus of roof's stiffener

0.1284 ∗ 𝑊𝑚𝑎𝑥 ∗ 𝑎 ∗ 𝑏
𝑍𝑟𝑒𝑞. = = 1955.6 mm3
𝑆
Roof's stiffener angle L75x75x7 . It's section modulus. Zstiff. = 23938 mm3

Zstiff. > Zreq. OK

Therefore, Selected roof's stiffener is satisfactory.

III.3. Calculation for bottom plate of tank

 Project TAM DAO 05 JACK-UP RIG

Doc. Tittle CALCULATION FOR SWAGE HOLDING TANK

Doc. Number GK002-PR-CL-011 Rev. A Page 9 of 10

III.3.1. Material used

ABS-AH36 ← Tank's Shell material

121000.000 ← S: Maximum allowable stress @ 45 ºC (Kpa)
L100x100x10 ← Tank's bottom's stifferner angle

III.3.2. Calculation for bottom plate

The support of tank is rectangular beam.
Picture 3-2-2: Bottom plate

III.3.2.1. Calculation for bottom plate

Number of vertical stiffenners = 5

Number of horizontal stiffenners = 2
Maximum distance between horizontal stiffenner, a = 1050 mm
Maximum distance between vertical stiffenner, b = 500 mm
Ratio, a/b = 2.1
Thus, The constant β = 0.34
The constant α = 0.06

a) Thickness of bottom plate

Required thickness of bottom plate
𝛽∗𝑃𝑑
tr = b* + Ca = 8.9544 mm
𝑆∗𝐸
Selected thickness of bottom plate
tbp = 10.00 mm
Thus, selected thiskness of bottom plate is adequate. tbp > tr OK

Check deflection of bottom plate

Maximum deflection of bottom plate required
𝛼∗𝑃𝑑∗𝑏4
𝑌𝑑𝑚𝑎𝑥 = = 2.1407 mm
𝐸𝑚 ∗𝑡𝑏𝑝3
Where:
Elastic Modulus of material: Em = 2E+08 Kpa
Allowable deflection of bottom plate
Ydp = 5 mm
Thus, deflection of bottom plate is adequate. Ydp > Ydmax OK
 Project TAM DAO 05 JACK-UP RIG

Doc. Tittle CALCULATION FOR SWAGE HOLDING TANK

Doc. Number GK002-PR-CL-011 Rev. A Page 10 of 10

Therefore, Selected plate thickness is satisfactory.

b) Calculation for bottom stiffener

Maximum load
Wmax = Pd*a/2 = 59.924 N/mm
Required section modulus of bottom stiffener
0.1284 ∗ 𝑊𝑚𝑎𝑥 ∗ 𝑎 ∗ 𝑏
𝑍𝑟𝑒𝑞. = = 33384 mm3
𝑆
Bottom stiffener angle L100x100x10 . It's section modulus. Zstiff. = 50697 mm3

Thus, Using bottom stiffener is adequate. Zstiff. > Zreq. OK

Therefore, Selected bottom's stiffener is satisfactory.