Cd & Cm Adjustment.xls

PROJ No

PHASE/CTR -

ACTIVITY CdCm Handrail Calculation

PROJECT FILE

SUBJECT CdCm Handrail Calculation SHEET OF

REVISION DATE BY CHECKED APPROVED REVISION DATE BY CHECKED APPROVED

DESIGN BASIS

The Cd & Cm values of conductor guide plating in local z direction

will be adjusted to the corresponding values of the

conductor guide framing members supporting them,

The effective Cd of a supporting member is given by

Cd =

A'

where

A' is Drag area of the adjusted member(s)

The effective Cm of a supporting member is given by

Cm =

V'

where

V' is Volume of the adjusted member(s)

The Cd & Cm values of the Rectangular/ Circular plate members

will be taken as per Dynamics Of Fixed Marine Structures (Barltrop)

REFERENCES :

1. API Recommended practice for planning, designing and

constructing fixed offshore platforms -

2. Dynamics of Fixed Marine Structures By NDP Barltrop / A J Adams

S Ai*Cdi

Ai is the Drag area of a component

Cdi is corresponding drag coeff.

S Vi*Cmi

Vi is the Volume of a component

Cmi is corresponding mass coeff.

Working stress design. 20 th edition.

PROJ No

PHASE/CTR -


PROJECT FILE



Equivalent hydrodynamic coefficient for handrail supporting member

48.3 mm tube

48.3 mm tube

48.3 mm tube 48.3 mm tube

###

###

Basic Cd & Cm values for tubular members are as follows

Tubular Type Inplace Condition

Smooth 0.65 1.6

For 100x6thk kick plate the Cd & Cm values are calculated as per

Dynamics of Fixed Marine Structures By NDP Barltrop & A J Adams (Page No. 310)

Cd = 1.90

Cm = 13.566

Diameter of the member = 609.6 mm

1 + (p x D / 4T) =

z

y x

101.6X6.35 THK Plate

PROJ No

PHASE/CTR -


PROJECT FILE



Cd = =

A'

where

Area of Vertical post Area of Kick plate

Cd of Vertical post Cd of the Kick plate

Area of Horizontal post Area of Adusted element

Cd of Horizontal post Cd of the adjusted element

1.113

Cm = =

V'

where

Volume of Vertical post Volume of Kick plate

Cm of Vertical post Cm of the Kick plate

Volume of Horizontal post Volume of Adusted element

Cm of Horizontal post Cm of the adjusted element

1.657

Cd and Cm modification value due to handrail and grating are shown in the following table:

Location D Cd CmModified Value

Cdy Cdz Cmy Cmz

609.6 0.65 1.6 1.11 - 1.66 -

219.1 0.65 1.6 1.94 - 2.04 -

Adjusted Values of Cds for Horizontal Framing Members

S Ai*Cdi Avp*Cdvp + Ahp*Cdhp + Akp*Cdkp+ Aele*Cdele

Aele

Avp = Akp =

Cdvp = Cdkp =

Ahp = Aele =

Cdhp = Cdele =

Adjusted value of Cd for Inplace condition

Cdinp =

Adjusted Values of Cms for Horizontal Framing Members

S Vi*Cmi Vvp*Cmvp + Vhp*Cmhp + Vkp*Cmkp+ Vele*Cmele

Vele

Vvp = Vkp =

Cmvp = Cmkp =

Vhp = Vele =

Cmhp = Cmele =

Adjusted value of Cm for Inplace condition

Cminp =

Hor. framing at el(+)6.4 - Cd Cm Value mod. due to handrail

PROJ No

PHASE/CTR -


PROJECT FILE



cd cmIn-Place Fatigue OBS In-Place Fatigue OBS

Row A Diagonal member 1.23 0.98 0.88 1.28 2.08 1.73

1.69 1.44 1.60 1.44 2.24 2.15

1.62 1.37 1.34 1.37 2.17 1.94

1.52 1.27 1.21 1.38 2.18 1.86

Row B Diagonal member 1.23 0.98 0.88 1.28 2.08 1.73

1.69 1.44 1.61 1.45 2.25 2.15

1.62 1.37 1.34 1.37 2.17 1.94

1.52 1.27 1.21 1.38 2.18 1.86

Row 1 Diagonal member 1.21 0.96 0.85 1.28 2.08 1.72

1.69 1.44 1.61 1.44 2.24 2.15

1.60 1.35 1.31 1.36 2.16 1.93

1.55 1.30 1.24 1.39 2.19 1.87

Row 2 Diagonal Member 1.23 0.98 0.87 1.28 2.08 1.73

1.52 1.27 1.36 1.38 2.18 2.01

1.52 1.27 1.22 1.34 2.14 1.88

1.42 1.17 1.09 1.34 2.14 1.80

Hor. Framing EL (-) 75.5 1.39 1.14 1.09 1.38 2.18 1.91

1.39 1.14 1.09 1.38 2.18 1.91

1.37 1.12 1.07 1.37 2.17 1.89

1.37 1.12 1.07 1.37 2.17 1.89

1.56 1.31 1.32 1.49 2.29 2.12

1.56 1.31 1.32 1.49 2.29 2.12

1.42 1.17 1.14 1.41 2.21 1.98

1.42 1.17 1.14 1.41 2.21 1.98

1.40 1.15 1.11 1.40 2.20 1.95

1.40 1.15 1.11 1.40 2.20 1.95

EL (-) 51.51 1.73 1.48 1.50 1.51 2.31 2.09

1.73 1.48 1.50 1.51 2.31 2.09

1.38 1.13 1.07 1.35 2.15 1.84

1.94 1.69 1.78 1.64 2.44 2.31

1.81 1.56 1.62 1.58 2.38 2.21

1.94 1.69 1.84 1.71 2.51 2.51

EL (-) 29.57 1.86 1.61 2.01 1.57 2.37 2.64

1.86 1.61 2.01 1.57 2.37 2.64

1.83 1.58 1.95 1.56 2.36 2.59

1.83 1.58 1.95 1.56 2.36 2.59

1.92 1.67 2.18 1.63 2.43 2.92

1.62 1.37 1.70 1.50 2.30 2.64

1.62 1.37 1.70 1.50 2.30 2.64

EL (-) 10.36 2.13 1.88 2.03 1.73 2.53 2.46

2.01 1.76 1.87 1.67 2.47 2.37

1.53 1.28 1.26 1.44 2.24 1.98

2.31 2.06 2.33 1.92 2.72 2.89

1.97 1.72 1.96 1.83 2.63 2.89

1.97 1.72 1.96 1.83 2.63 2.89

1.74 1.49 1.60 1.63 2.43 2.42

Knee Brace 1.28 1.03 0.96 1.33 2.13 1.84

1.28 1.03 0.96 1.33 2.13 1.84

1.28 1.03 0.96 1.33 2.13 1.84

1.28 1.03 0.96 1.33 2.13 1.84

1.47 1.22 1.23 1.46 2.26 2.10

1.47 1.22 1.23 1.46 2.26 2.10

1.47 1.22 1.23 1.46 2.26 2.10

1.47 1.22 1.23 1.46 2.26 2.10

0 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 00 0.65 0 0 1.6 0

7 15

PROJECT NO.

PHASE/CTR

ACTIVITY Jacket In-Place Analysis

PROJECT FILE

SUBJECT Cd & Cm Adjustment SHEET OF

'file:///tt/file_convert/55cf8fef550346703ba16c8c/document.xls'#$IN-PLACE


2/18/2005 LTH MV

Revised Cd and Cm values for Anode Carrying Members

Type of Anode : Rectangular anode

Condition : In-Place Condition

= 3.008 m

Width of anode (B) = 0.275 m

Heigth of Anode (H ) = 0.510 m (assumed full anode projected area)

= 2.000 (API 2.3.1.b)

= 2.000 (API 2.3.1.b)

Marine Growth = 0.076 m (MSL to - 16.80 m) and (-35.1 m to 77.1 m) (Struc Design Philosophy)

= 0.152 m (-16.8 m to 35.1 m ) (Struc Design Philosophy)

=

= 1.534

=

= 0.827

=

= 0.422

= 1.050 ROUGH CYLINDER (API 2.3.1.b)


= D = Diameter of tubular member

= Length of tubular member

N = Numbers of anodes attached to tubular member

=

=

=

=

Length of Anode (L1)

Cd Value of anode (Cd1)

Cm Value of anode (Cm1)

Anode area (A1y) (L1 ) * (H)

m2 per unit

Anode area (A1z) (L1 ) * (B)

m2 per unit

Anode volume (V1y and z) (L1) * (H) * (B)

m3 per unit

Cd Value of tubular member (Cd2)

Cm Value of tubular member (Cm2 )

Tubular member screen area (A2) (D) * La

Tubular member displ. volume (V2) p / 4 * (D)2 * La La =

Modified Cd Value (Cdy) ( N * A1y * Cd1 + A2 * Cd2 ) / A2

Modified Cd Value (Cdz) ( N * A1z * Cd1 + A2 * Cd2 ) / A2

Modified Cm Value (Cmy) ( N * V1y * Cm1 + V2 * Cm2 ) / V2

Modified Cm Value (Cmz) ( N * V1z * Cm1 + V2 * Cm2 ) / V2

B

HL1

Anodes

8 15

PROJECT NO.

PHASE/CTR


PROJECT FILE




2/18/2005 LTH MV

Modified value of Cd and Cm are presented in the following table.

9 15

PROJECT NO.

PHASE/CTR


PROJECT FILE




2/18/2005 LTH MV

Location ElementsModified Value

Cdy Cdz Cmy Cmz

Row A Diagonal member 0.610 22.2 16.89 10.11 1 1.23 1.05 1.28 1.20

Row B Diagonal member 0.610 22.0 16.79 10.05 1 1.23 1.05 1.28 1.20

Row 1 Diagonal member 0.610 24.6 18.75 11.22 1 1.21 1.05 1.28 1.20

Row 2 Diagonal Member 0.610 22.9 17.47 10.45 1 1.23 1.05 1.28 1.20

Hor. Framing EL (-) 75.5 0.508 27.2 17.99 9.33 2 1.39 1.05 1.38 1.20

EL (-) 51.51 0.609 23.8 18.14 10.84 4 1.73 1.05 1.51 1.20

EL (-) 29.57 0.457 19.8 15.08 9.01 4 1.86 1.05 1.57 1.20

EL (-) 10.36 0.559 16.0 11.36 6.35 4 2.13 1.05 1.73 1.20

D (m)

L (m)

A2 (m2)

V2 (m3)

Nos of Anode

PROJECT NO.

PHASE/CTR

ACTIVITY CdCm Anode Calculation

PROJECT FILE

SUBJECT CdCm Anode Calculation SHEET OF

'file:///tt/file_convert/55cf8fef550346703ba16c8c/document.xls'#$OBS




Condition : On-Bottom Condition

= 3.008 m


Heigth of Anode (H ) = 0.510 m

= 2.000 (API 2.3.1.b)

= 2.000 (API 2.3.1.b)



=

= 1.534

=

= 0.827

=

= 0.422

= 0.650 SMOOTH CYLINDER (API 2.3.1.b)

= 1.600 SMOOTH CYLINDER (API 2.3.1.b)




=

=

=

=






m2 per unit


m2 per unit


m3 per unit









B

HL1

Anodes

PROJECT NO.

PHASE/CTR


PROJECT FILE





Cdy Cdz Cmy Cmz


0.610 26.4 16.09 7.70 5 1.60 0.65 2.15 1.60

0.711 31.2 22.22 12.41 5 1.34 0.65 1.94 1.60

0.762 36.0 27.42 16.41 5 1.21 0.65 1.86 1.60


0.610 26.2 16.00 7.66 5 1.61 0.65 2.15 1.60

0.711 31.1 22.10 12.35 5 1.34 0.65 1.94 1.60

0.762 35.8 27.29 16.33 5 1.21 0.65 1.86 1.60


0.610 26.3 16.06 7.69 5 1.61 0.65 2.15 1.60

0.711 32.5 23.09 12.90 5 1.31 0.65 1.93 1.60

0.762 33.9 25.82 15.45 5 1.24 0.65 1.87 1.60


0.610 28.3 17.24 8.26 4 1.36 0.65 2.01 1.60

0.711 30.2 21.50 12.01 4 1.22 0.65 1.88 1.60

0.762 36.4 27.72 16.59 4 1.09 0.65 1.80 1.60

Hor. Framing EL (-) 75.5 0.508 27.2 13.84 5.52 2 1.09 0.65 1.91 1.60

0.508 27.2 13.84 5.52 2 1.09 0.65 1.91 1.60

0.508 29.0 14.73 5.88 2 1.07 0.65 1.89 1.60

0.508 29.0 14.73 5.88 2 1.07 0.65 1.89 1.60

0.457 39.8 18.18 6.53 4 1.32 0.65 2.12 1.60

0.457 39.8 18.18 6.53 4 1.32 0.65 2.12 1.60

0.457 27.2 12.45 4.47 2 1.14 0.65 1.98 1.60

0.457 27.2 12.45 4.47 2 1.14 0.65 1.98 1.60

0.457 29.0 13.25 4.76 2 1.11 0.65 1.95 1.60

0.457 29.0 13.25 4.76 2 1.11 0.65 1.95 1.60

EL (-) 51.51 0.609 23.8 14.51 6.94 4 1.50 0.65 2.09 1.60

0.609 23.8 14.51 6.94 4 1.50 0.65 2.09 1.60

0.609 24.2 14.74 7.05 2 1.07 0.65 1.84 1.60

0.559 24.2 13.52 5.94 5 1.78 0.65 2.31 1.60

0.559 34.0 18.97 8.33 6 1.62 0.65 2.21 1.60

0.457 34.0 15.52 5.57 6 1.84 0.65 2.51 1.60

EL (-) 29.57 0.457 19.8 9.05 3.25 4 2.01 0.65 2.64 1.60

0.457 19.8 9.05 3.25 4 2.01 0.65 2.64 1.60

0.457 20.7 9.45 3.39 4 1.95 0.65 2.59 1.60

0.457 20.7 9.45 3.39 4 1.95 0.65 2.59 1.60

D (m)

L (m)

A2 (m2)

V2 (m3)

Nos of Anode

PROJECT NO.

PHASE/CTR


PROJECT FILE




0.406 19.8 8.04 2.56 4 2.18 0.65 2.92 1.60

0.355 16.5 5.84 1.63 2 1.70 0.65 2.64 1.60

0.355 16.5 5.84 1.63 2 1.70 0.65 2.64 1.60

EL (-) 10.36 0.559 16.0 8.93 3.92 4 2.03 0.65 2.46 1.60

0.559 17.9 10.03 4.40 4 1.87 0.65 2.37 1.60

0.559 17.9 10.03 4.40 2 1.26 0.65 1.98 1.60

0.457 16.0 7.30 2.62 4 2.33 0.65 2.89 1.60

0.356 13.2 4.68 1.31 2 1.96 0.65 2.89 1.60

0.356 13.2 4.68 1.31 2 1.96 0.65 2.89 1.60

0.406 16.0 6.48 2.07 2 1.60 0.65 2.42 1.60

Knee Brace 0.457 21.5 9.83 3.53 1 0.96 0.65 1.84 1.60

0.457 21.5 9.83 3.53 1 0.96 0.65 1.84 1.60

0.457 21.5 9.83 3.53 1 0.96 0.65 1.84 1.60

0.457 21.5 9.83 3.53 1 0.96 0.65 1.84 1.60

0.406 13.1 5.32 1.70 1 1.23 0.65 2.10 1.60

0.406 13.1 5.32 1.70 1 1.23 0.65 2.10 1.60

0.406 13.1 5.32 1.70 1 1.23 0.65 2.10 1.60

0.406 13.1 5.32 1.70 1 1.23 0.65 2.10 1.60

PROJECT NO.

PHASE/CTR

ACTIVITY

PROJECT FILE


'file:///tt/file_convert/55cf8fef550346703ba16c8c/document.xls'#$FATIGUE




Condition : Fatigue Condition

= 3.008 m


Heigth of Anode (H ) = 0.510 m

= 2.000 (API 2.3.1.b)

= 2.000 (API 2.3.1.b)



=

= 1.534

=

= 0.827

=

= 0.422






=

=

=

=






m2 per unit


m2 per unit


m3 per unit









B

HL1

Anodes

PROJECT NO.

PHASE/CTR

ACTIVITY

PROJECT FILE





Cdy Cdz Cmy Cmz


0.610 26.4 24.11 17.30 5 1.44 0.80 2.24 2.00

0.711 31.2 26.98 25.28 5 1.37 0.80 2.17 2.00

0.762 36.0 32.90 23.63 5 1.27 0.80 2.18 2.00


0.610 26.2 23.98 17.21 5 1.44 0.80 2.25 2.00

0.711 31.1 26.84 25.16 5 1.37 0.80 2.17 2.00

0.762 35.8 32.75 23.52 5 1.27 0.80 2.18 2.00


0.610 26.3 24.07 17.27 5 1.44 0.80 2.24 2.00

0.711 32.5 28.03 26.28 5 1.35 0.80 2.16 2.00

0.762 33.9 30.99 22.25 5 1.30 0.80 2.19 2.00


0.610 28.3 25.84 18.54 4 1.27 0.80 2.18 2.00

0.711 30.2 26.11 24.47 4 1.27 0.80 2.14 2.00

0.762 36.4 33.26 23.89 4 1.17 0.80 2.14 2.00

Hor. Framing EL (-) 75.5 0.508 27.2 17.99 9.33 2 1.14 0.80 2.18 2.00

0.508 27.2 17.99 9.33 2 1.14 0.80 2.18 2.00

0.508 29.0 19.15 9.93 2 1.12 0.80 2.17 2.00

0.508 29.0 19.15 9.93 2 1.12 0.80 2.17 2.00

0.457 39.8 24.25 11.61 4 1.31 0.80 2.29 2.00

0.457 39.8 24.25 11.61 4 1.31 0.80 2.29 2.00

0.457 27.2 16.60 7.95 2 1.17 0.80 2.21 2.00

0.457 27.2 16.60 7.95 2 1.17 0.80 2.21 2.00

0.457 29.0 17.67 8.46 2 1.15 0.80 2.20 2.00

0.457 29.0 17.67 8.46 2 1.15 0.80 2.20 2.00

EL (-) 51.51 0.609 23.8 18.14 10.84 4 1.48 0.80 2.31 2.00

0.609 23.8 18.14 10.84 4 1.48 0.80 2.31 2.00

0.609 24.2 18.43 11.02 2 1.13 0.80 2.15 2.00

0.559 24.2 17.21 9.61 5 1.69 0.80 2.44 2.00

0.559 34.0 24.15 13.49 6 1.56 0.80 2.38 2.00

0.457 34.0 20.69 9.90 6 1.69 0.80 2.51 2.00

EL (-) 29.57 0.457 19.8 15.08 9.01 4 1.61 0.80 2.37 2.00

0.457 19.8 15.08 9.01 4 1.61 0.80 2.37 2.00

0.457 20.7 15.74 9.41 4 1.58 0.80 2.36 2.00

0.457 20.7 15.74 9.41 4 1.58 0.80 2.36 2.00

D (m)

L (m)

A2 (m2)

V2 (m3)

Nos of Anode

PROJECT NO.

PHASE/CTR

ACTIVITY

PROJECT FILE




0.406 19.8 14.07 7.84 4 1.67 0.80 2.43 2.00

0.355 16.5 10.84 5.61 2 1.37 0.80 2.30 2.00

0.355 16.5 10.84 5.61 2 1.37 0.80 2.30 2.00

EL (-) 10.36 0.559 16.0 11.36 6.35 4 1.88 0.80 2.53 2.00

0.559 17.9 12.76 7.13 4 1.76 0.80 2.47 2.00

0.559 17.9 12.76 7.13 2 1.28 0.80 2.24 2.00

0.457 16.0 9.74 4.66 4 2.06 0.80 2.72 2.00

0.356 13.2 6.69 2.67 2 1.72 0.80 2.63 2.00

0.356 13.2 6.69 2.67 2 1.72 0.80 2.63 2.00

0.406 16.0 8.92 3.91 2 1.49 0.80 2.43 2.00

Knee Brace 0.457 21.5 13.10 6.27 1 1.03 0.80 2.13 2.00

0.457 21.5 13.10 6.27 1 1.03 0.80 2.13 2.00

0.457 21.5 13.10 6.27 1 1.03 0.80 2.13 2.00

0.457 21.5 13.10 6.27 1 1.03 0.80 2.13 2.00

0.406 13.1 7.32 3.21 1 1.22 0.80 2.26 2.00

0.406 13.1 7.32 3.21 1 1.22 0.80 2.26 2.00

0.406 13.1 7.32 3.21 1 1.22 0.80 2.26 2.00

0.406 13.1 7.32 3.21 1 1.22 0.80 2.26 2.00

Cd & Cm Adjustment.xls

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