Steel stack design as per ASME STS-1Full description
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CHIMNEY DESIGN CALCULATION CODE
: I.S. 6533 CUSTOMER : CHIMNEY DIAMETER-TOP D1(IN cm) CHIMNEY DIA BOTTOM BD (IN cm) CHIMNEY HEIGHT TOTAL H( IN cm) CORROSION ALLOWANCE ALLOWABLE BEARING ON FOUNDATION Ff( IN KG/cm2) ALLOWABLE BENDING STRESS-BEARING PLATE Fbp( IN KG/cm2)
SEGMENT I SEGMENT II SEGMENT III SEGMENT IV SEGMENT V
DIA D1 ( IN cm) 132 132 132 132 176
PAGE
DIA D1' (IN cm) 132 132 132 176 220
D AVG (IN cm) 132 132 132 154 198
SECTIONAL HEIGHT (IN cm) 960 960 920 880 880
SHELL THICKNESS (IN MM) ( IN cm) 10 1.00 12 1.20 16 1.60 20 2.00 22 2.20
MAXIMUM PERMISSBLE COMBINED STRESS Mpa WITH TEMPERATURE CORRECTION FACTOR ALLOWABLE COMBINED STRESS a =
108 81
STABILITY CHECK 1.6 (Fb+ Fc) - 0.9 xFc < 1.8 x a 58.37330333 (CALCULATED)
<
145.8 Mpa (ALLOWABLE)
FOUNDATION BOLTS MAXIMUM FORCE ON EACH BOLT WHERE
P
=
(4M/nD1)-(Ws/n)
M n Ws D1
= = = =
B.M AT THE BASE OF CHIMNEY x NUMBER OF BOLTS WEIGHT OF THE CHIMNEY DIA OF BOLTCIRCLE pcd=
100000.00
11 OF 14
PAGE 25622479.54 Kg cm 256.22 (x 100000 Kg cm) 32 32000 KGS 250 cm
M= BM= n= Ws= D1=
NET AREA OF BOLT NOW BOLT DIA D2 NOW BOLT DIA D
P=
11811.23977 KG
= SAY = =
14.76404971 15 19.10219675 cm2 4.370605994 cm
cm2 cm2
USE M50 DIA BOLT DESIGN OF BASE PLATE COMPRESSIVE FORCE Cf
W1 Cf Ff REQUIRED WIDTH OF BEARING PLATE B
WIDTH OF BEARING PLATE PROVIDED b
= WHERE D= = = = = = = = =
THK OF BEARING PLATE t' = ((3*Ff)/Fbp) t' HENCE THICKNESS OF THE PLATE t'
=
1.27*M/D*D+(Ws+W1)/3.142 D1 EXTERNAL DIA OF CHIMNEY BASE 275 cm WEIGHT OF THE CHIMNEY LINING 471.03 Kg / Sq.Cm 20 Cf/Ff 23.5513 cm 27.5 cm WIDE BEARING PALTE b/2 * sqrt (3* Ff)/Fbp = 0.036363636 0.190692518 2.62202 cm 3.2 cm