Elbow Thickness Calculator [PDF]

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Bend Thickness calculation as per ASME B31.3 t= for Intrados I= for Extrados I=

(PD)/(2*[SEW/I]+PY) ((4*(R1/D)-1)/(4*(R1/D)-2)) ((4*(R1/D)+1)/(4*(R1/D)+2))

Where, Design Pressure P= 2 N/mm2 Outside diameter D= 864 mm Allowable stress in tension S= 137.893 N/mm2 Quality Factor E= 1 Weld joint strength reduction factor W= 1 Co-efficient Y= 0.4 Mean Radius R= 1295 mm Inner Diameter of Bend IR= 1726 mm Outer Diameter of Bend OR= 3454 mm for Intrados I= 1.998843 for Extrados I= 0.714262 Corrosion allowance CA= 1.6 mm Manufacturing tolerence %= 12.5 % Cal.Bend Thickness for Intrados t= Cal.Bend Thickness for Extrados t= Cal.Pipe wall thickness t=

12.452 mm 4.466118 mm 6.247605 mm

Req.Bend Thickness for Intrados t= Req.Bend Thickness for Extrados t= Req.Pipe wall thickness t=

15.8085 mm 6.824383 mm 8.828555 mm

Resultant min.bend thickness t=

15.8085 mm

20 bar 20000 psi 20 ksi 137893 kpa 137.893 mpa

=

2 N/mm2

= = = =

137.893 N/mm2 137.893 N/mm2 137.893 N/mm2 137.893 N/mm2

Pipe wall thickness as per ASME Sec VIII Div.1

Circumfernetial stress(longitudinal joints) : When thickness does n inside diameter or P does not exceed 0.385SE the following formu t= PR/(SE-0.6P)

Longitudinal stress(circumferential joints) : When thickness does n inside diameter or P does not exceed 1.25SE the following formula t= PR/(2SE+0.4P)

Internal Design Pressure Inside Radius Allowable Stress Joint Efficiency

Boundary condtions: P= 2 N/mm2 R= 864 mm S= 137.893 N/mm2 E= 1

0.385SE 1.25SE

Since the "P" value lies below 0.385SE formula-1 applies for this c Calculated minimum thickness Corrosion allowance Manufacturing tolerance Req.min.thickness

t= 12.64147 mm CA= =

1.6 mm 12.5 %

tmin= 16.02165 mm

Div.1

: When thickness does not exceed one half of the 85SE the following formula applies formula-1

: When thickness does not exceed one half of the 5SE the following formula applies formula-2

20 bar

= =

53.08881 N/mm2 172.3663 N/mm2

mula-1 applies for this calculation.

20000 psi 20 ksi 137893 kpa 137.893 mpa

= = = = =

2 N/mm2 137.893 N/mm2 137.893 N/mm2 137.893 N/mm2 137.893 N/mm2