Post on 14-Dec-2015
description
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