SHEET 1 OF 4

NAME : NAME : DATE

SIGN: SIGN :

DESIGN CALCULATION FOR

MAKER'S No. EC

TYPE OF BOILER :ECONOMISER COIL

DESCRIPTION TEMP. °C Pr. Kg/cm2

DESIGN CODE : IBR 1950

TOTAL HEATING SURFACE

AREA: 0.3835 sq.m

17.00

PREPARED CHECKED APPROVED & DATE

NAME :

SIGN :

ECONOMISER COIL 180.00

SHEET 2 OF 4

25 x 1.6

WP = t = + c

Where,

WP = 17.00 Kg/cm2

t =

D = 25 mm

f =1203.27 Kg/cm

2

c = 0 mm

t = + 0

= 0.18 mm

= Nom.Thickness + Neg.Tolerance ( %)

=

= 0.18 mm

0.18

1.60

Nom.Thickness - Neg. Tolerance (0.00%)

- 0.00

164.55 17.00

THICKNESS CALCULATION FOR ECONOMISER COILS : (IBR 338)

Reference Drawing No.: EC-00-A4-001/00

Material size(Dia)= mm

Material Spec. = SA 210 Gr.A1

f x (t - c) WP x D

--------------- Eqn.87 ----------------D - t + c 2 x f - WP

Working Pressure in Kg/cm2 =

Min. thickness required in mm

External Dia of tube =

Allow stress for material SA 210 Gr.A1 as per ASME section - II Part -

D at metal working temp. 180 °C =

(for working pressure below 70 Kg/cm2) =

17 x 25

-------------------- 2 x 1203.27 - 17

0.00

0.18 + 0

Min.Thickness Reqd. = mm

Provided Thickness t, = mm

Working Pressure Calculation for provided thickness of tube.

Min.Thickness Provd. , t =

= 1.60

= 1.60 mm

2 x 1203.27 x (1.6 - 0)

WP = ---------------------------------25 - 1.6 + 0

= Kg/cm2 > Kg/cm

2

SHEET 3 OF 4

25 x 1.6 Matl. Temp.

180

WP = t = + c

Where,

WP = 17.00

t =

D = 25

f =

1203.27 Kg/cm2

c = 0 mm

+ 0.75

0.18 mm

Nom.Thickness + Neg.Tolerance (0%) Neg. Tol. 0

0.18 + 0 Thin. Allow 12.5

= Nom.Thickness + Thin. Allowance (12.5%)

= 0.18 + 0.0222

0.20

= - 0.00

= Nom.Thickness - Thinnin. Allowance (12.5%)

= - 0.2

=

17.00 Kg/cm2

THICKNESS CALCULATION FOR ECONOMISER BEND COILS : (IBR 338)

Reference Drawing No.: EC-00-A4-001/00

Matl. size(DiaxThk) = mm

Material Spec. = SA 210 GR. A1

2 x f x (t - c) WP x D

----------- Eqn.87 --------------D - t + c 2 x f - WP

Allow stress for material SA 210 GR. A1 as per ASME section - II Part -D

at metal working temp. 180 °C =

(for working pressure above 70 Kg/cm2) =

Working Pressure in Kg/cm2 =

Min. thickness required in mm

External Dia of tube = mm

17 x 25

t = --------------------

2 x 1203.27 - 17

=

=

=

= mm

Min.Thickness Reqd. = 0.20 mm

Provided Thickness t, = 1.6 mm

Working Pressure Calculation for provided thickness of tube.

Min.Thickness Provided , t = Nom.Thickness - Neg. Tolerance (0%)

1.60

1.60

1.40

2 x 1203.27 x (1.4 - 0)

WP = ------------------------25 - 1.4 + 0

= 142.76 Kg/cm2 >

SHEET 4 OF 4

S.No

1

DRAWING LIST

MAKER'S No. SHC

Drawing No. Description

EC-00-A4-001/00 Economiser Coil