Pipeline Lowering Calculation

ONSHORE PIPELINE LOWERING CALCULATION CALCULATION

I$ <$ /A?$ /#A)I- @$W$$ /ID$ @''/ >$I>$D ?'> #'/II'I- AD "'W$>I'? #I#$"I$ I' >$)<.

INPUT DATA: Di Dia of pipe Wa Wall thickness

Do

= 914.40 = 14.23

mm mm

= 885.94

mm

In Internal diameter of pipe

t Di

An Anti corrosion coatin thickness ! 3"#$ %

tc

= 3.&5

mm

#i #ipe 'D (ith anti corrsion coatin

Dc

= 921.90

mm

)o )oncrete (eiht coatin thickness

tc(

= 0.00

mm

#i #ipe 'D (ith concrete (eiht coatin thickness

Dc(

= 921.90

mm

De Densit* of steel

ρs

= &850.00

k+m,

De D ensit* of 3 "#$

ρ3lpe.

= 990.00

k+m,

De Densit* of concrete #i #ipe material !-rade% /p /pecified minimm *ield strenth ons modls #oissons ratio

ρc

= = = = =

k+m,

hermal epansion co7efficient "e "enth of pipe Allo(a:le lonitdinal stress

// $ v

α " σL allo(a:le

2400.00  &0 485.00 206000.00 0.30

= 0.000011&0 = 162000.00 = 436.50

+mm +mm 7 + 0) mm +mm

C

= 22.00

0

Area of pipe !/teel%

i Asteel

= 0.040

m²

Area of coatin !3"#

%$A3"#$

= 0.011

m²

Area of coatin !concrete%

Aconcrete

= 0.000

m²

Weiht of steel

Wsteel

= 315.90

;+m

Weiht of 3"#$ coatin

W3"#$

= 10.&1

;+m

Weiht of concrete coatin

Wconcrete

= 0.00

;+m

otal (eiht of pipe

Wtotal

= 326.61

;+m

#i # ipeline installation temperatre

Trench Trench details:

1

= 1000.00

mm

2

= 1000.00

mm

4

= 1921.90

mm

Certicle distance :et(een pipe on skid and pipe on trench :ottom

5

= 2921.90

rench ap on left side of pipe

1

= 150.00

mm

rench ap on riht side of pipe rench side anle

2

Ø

= 150.00 = 16.00

mm Deree

3

= 551.10

mm

Depth of coBer

=

!4= 2 G D%

Depth of trench

X 3 =

(

Y 4 tan

( 90− φ

)

Width of trench at top

W top= D + X 1 + X 2 + 2× X 3

Wtop

= 2324.09

mm

Width of trench at :ottom

W bottom= D + X 1 + X 2

W :ottom

= 1221.90

mm

4

= 500.00

mm

D pipe

= 921.90

mm

6

= 2123.00

mm

#osition of pipe restin on skid from ede of trench

Width of pipe skid ! assmed as eal to pipe 'D % Desin :oom oBerhan to :e considered for side :oom load capacit* estimation

X 6 =

W top 2

+ X 4 +

D 2

Side boo details:

@ased on the information collected from site and it is sested that oBerhanin to :e considered is as iBen :ello(E7 1. ?irst side :oom moBin in for(ard direction % 7  8 = 4500 mm from trench centre 2. /econd side :oom ! :ehind side :oom (hich (ill place the pipe section in the trench % 7  8 = 3500 mm from trench centre 3. hird side :oom ! :ehind second side :oom (hich (ill place the pipe section in the trenc h % 7  8 = 2500 mm from trench centre 4. he side :oom (ill :e placed in staered position (ith respect to trench centre line. It (ill reslt in nearl* same :oom oBerhan !  & % (hich ma* Bar* from 2500 mm to 3500 mm (hich (ill iBe the more conserBatiBe reslts. 5. m:er of side :ooms placed

= 3.00

nos.

6. /afe lift capacit* at :oom oBerhan at distance  &

= 19.00

onnes

&. /elected safe liftin capacit* = safe liftin capacit*

= 19.00

onnes

/f capacit*

= 1.25

[OD 4 − ID 4 ]

I

= 0.0041

m4

[ OD 3 − ID 3 ]

F

= 0.00&

m3

= 298.&6

m

8. /afet* factor !assmed%

CALCULATIONS :

A. oment of inertia

@. /ection modls

I =

π 64

Z =

π 32

). inimm radis of crBatre for elastic :endin drin installation

Rc =

0 .5 E ×OD steel 0 . 6 5 ×SMYS

CALCULATION !OR SA!E LI!T POINT SPACING:

A. inimm spacin :et(een t(o side :ooms (ith considerin total (eiht of pipe

S sideboom =

Capacity sideboom

= 46.54

m

/side:oom

= 24.00 SPACING IS SA!E

m

δactual

= 15.94

mm

A)

= 12.00

m



= 298.52

m

Hallo(a:le

= 241.10

mm

SF capacity ×W total

@. /elected side:oom spacin

CHEC" !OR DE!LECTION:

A. aimm deflection (ith considerin steel (eiht onl* 4

δ actal =

5× W steel × S

sideboom

384 × E × I

@. aimm allo(a:le sa as per elastic :end radis )hord lenth A)

[√

X = R Allo(a:le sa

S sideboom

!C =

δ allo"able

2

c

sa#

(

2

)2

− !C

]

= R c − X

De%lection chec& : ' act(al sho(ld be less than ' allo)able

DE!LECTION IS SA!E

CHEC" !OR #ENDING $O$ENT:

A. aimm :endin moment 2

M b =

" pipe × S

sideboom

 :

= 2.30&$G05

s allo(a:le

= 315.25

 : allo(a:le

= 2.141$G06

7m

8

@. aimm allo(a:le :endin stress = 0.65  //

+mm

). aimm allo(a:le :endin moment

M b

$ = M s allo"able × allo"able

Chec& %or bendin* oent : $ b a+ sho(ld be less than $ b allo)able

7m

#ENDING $O$ENT IS SA!E

CALCUATIONS !OR POSITIONNING AND LA,ING O! PIPELINE:

A. aimm horiantal distance :et(een cetere of trench and oriinal position of pipe

@. otal Berticle distance to :e coBered

6

= 2.12

m

5

= 2.92

m

Drin the process of positionnin and la*in of pipe it (ill :end in do:le crBatre in horiantal as (ell as inBerticle plane. ). aimm distance to :e coBered

Dis tan ce ma% =

√ ( X Y ) 2 + 6

2 5

Distance ma

= 3.61

m

D. "enth of pipe strin :et(een tochdo(n point at roller on rond and toch do(n point at the trench :ottom = ! = /side:oom  nm:er of side :ooms % Ds: = &2.00

$. otal arc lenth

"total arc = Ds:

m

"total arc

= &2.00

m

"half arc

= 36.00

m

Ф

= 6.92



= 296.58

m

S = R c − X

/

= 2.18

m

S allo"able= 2× S

/allo(a:le

= 4.35

m

?.
&half arc =

-. Anle

sin ϕ =

herefore

X = <. aimm deflection

&total arc

2

& 'al(a)c R c

&'al(a)c tan

(φ )

Deree

I. aimm allo(a:le deflection

Chec& %or a+ de%lection - a+i( allo)able de%lection sho(ld be ore than the a+i( distance to be co.ered

= DE!LECTION IS SA!E

Pipeline Lowering Calculation

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