Cold Bending Fdat

Sl No.

Name of Pipeline

System

Size, Nom, (inch)

(c)

(d)

Dia, dia D, Design pr Actual D, (mm) thk, (mm) Material DP, (psig) (inch) (Note-3)

(e)

(f)

(g)

(b)

1

18inMultiphase

Liquid

18

18

457

2

8inGasLift

Gas

8

8,625

219,1

14,27

3500

CS

6 5300

40

8763,00

1500,00

39,50

3

6inGasInjection

Gas

6

6,625

168,3

18,26

6500

CS

6 5300

40

6731,00

1500,00

39,50

3500

(i)

Wall Calculate Radius Cold Bend Tangent thinning = d Maximum angle per n= (RMultiplier Radius, length, 50/(n+1) maximum 1m of curved pipe (D/2))/D (Note-5) (mm) (mm) (deg) (Note-2) (%) (Note- angle 4) from

(a)

26,97

(h)

SMYS, (psi)

CS

(j) 65300

(k) 40

(l)

(m)

18288,00 1500,00

(n) 39,50

(o) 1,23

(r)

(s)

28,20

3,13

1,23

58,85

6,54

1,23

76,61

8,51

Note-1

The calculated maximum angle is the angle that can be made from 12m of pipe (minus 2 times the minimum tangent length at each end of the bend). Without exceeding these limits, construction may use multiple smaller angle bends to form bigger angles.

Note-2

The table also lists the angle per metre length of the pipe for the bend section (other than for the tangent length). Hence to calculate the angle for any given length, multiply the angle per metre with the length of the bend section. This does not consider any limitation on the cold bending machine.

Note-3

D is taken as the actual outside diameter.

Note-4

Wall thinning (%) is calculated as per PD 8010 part-1.

Note-5

The minimum permitted cold bend radius is 40D.

Note-6

Ovalisation due to cold bending shall not exceed 2.5% of nominal diameter.