How to Size A Sump Pit & Sump PumpsFull description
Sump pit design consideration and requirement for engineers
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DOC.NO:
M2011EP008A-88
Design calculation For Burnt Oil pit
REV R0
Design as a uncracked section as per IS 3370 Oil capacity = 35000 Litres. Taking 30% more = 40250 Litres
0.80
Volume of tank required = 40.3 CuM 2.7 Cap. of tank
=
Volume
= 43.2 CuM
Density of oil
=
Data:
4
x
0.9
4
2.7
OK
T /m 3
4.40
For M2 M25 and Fe 500
Perm Stress in concrete (c) = Perm Stress in steel (t ( t) m = 280/3c mc/t
x
3.70
=
=
150 N/mm2 ( IS 3370 Part II - Table 2)
11
= nc / (d-nc)
a = d - nc/3
9 N/m m2 m2 ( IS 456 Table 21) For M25 concrete
therefore nc nc =
= 0.79 d
therefore j =
MR = b nc c/ c/2 a = 2.08 bd2 Density of soil
0.62 d 0.79
therefore Q =
2.08
= 1.70 T/m3
Angle of repose = 10 deg
Ka =
0.7
Case I - When tank is full. (Neglecting earth pressure) Using design charts of IS 3370 Part Part IV - considering top and bottom hinged. As per Table 1 IS 3370 (Part IV) - 1967 a = height of wall =
3.7 m
Densit of li uid w = 0.9
b = W idth of wall =
4.4 m
Depth of wall below ground
c = W idth of wall =
4.4 m
c/a =
1.2
1.2
b/a =
Moment coefficients (Taking Maxm values) for b/a = Mx =
0.030 -0.010
Sterling Wilson Ltd.
My =
0.019 -0.045
= 3.4 m
1.25
Table 6 - IS 3370 Part IV
1
DOC.NO:
M2011EP008A-88
Design calculation For Burnt Oil pit
REV R0
Maximum Horizontal moment = Mx w a ^3 = 0.030 x 0.9 x 2.7 ^3 = 0.53 TM (Inside face) Maximum Horizontal moment = Mx w a ^3 = 0.010 x 0.9 x 2.7 ^3 = 0.18 TM (Outside face)
Oil Press. Horzt. Moment
Maximum Vertical moment = My w a ^3 = 0.045 x 0.9 x 2.7 ^3 = 0.8 TM (Outside face) Maximum Vertical moment = My w a ^3 = 0.019 x 0.9 x 2.7 ^3 = 0.34 TM (Inside face)
Oil press.
Vert. Moment Case II - When tank is empty (Full earth pressure) Soil pressure K a =
0.70 x 1.70 =
1.2
T/m2
Using design charts of IS 3370 Part IV - considering top and bottom hinged. Moment coefficients (Taking Maxm values) for b/a = Mx =
0.030 -0.010
My =
0.019 -0.045
1.25
Table 1 - IS 3370 Part IV
Maximum Horizontal moment = Mx w a ^3 = 0.030 x 1.2 x 3.2 ^3 = 1.18 TM (Outside face)
Soil Press.
Horzt. Moment
Maximum Horizontal moment = Mx w a ^3 = 0.010 x 1.2 x 3.2 ^3 = 0.39 TM (Inside face) Maximum Vertical moment = My w a ^3 = 0.045 x 1.2 x 3.2 ^3 = 1.77 TM (Inside face) Maximum Vertical moment = My w a ^3 = 0.019 x 1.2 x 3.2 ^3 = 0.75 TM (Outside face)
Sterling Wilson Ltd.
2
Soil Press.
Vert. Moment
DOC.NO:
M2011EP008A-88
Design calculation For Burnt Oil pit
REV R0
Depth of wall required = Sqrt ( M/Q b)
Required Provided d
d
= 1.77 x 10 2.08 x 1000
d
=
92
=
200 -
Provide overall depth = 25 -
12 =
200 mm
163 mm 0.100 x
Shear due to oil pressure will cause tension in walls and slab. Shear coefficients (Taking Maxm values) for b/a = Sx =
Table 7 - IS 3370 Part IV
0.512
Tension in wall
1.25
= = =
Coefficient x w x a^2 0.512 x 0.90 x 3.3592
2.7
^2
(depth of oil considered)
Area of horzt. steel required = M-Tx / t j d + T/t (For Maxm Values of BM) Horizontal steel outside face
=
Ast1
Ast1
= M-Tx / t j d
Ast1
= =
Ast2
Total Ast
+
Ast2
1.18 x 10 ^7 - 3.36 x 10^4 150 x 0.79 x 151 467.22 mm2
x 100
= T/t = 3.36 x 10 ^4 150 = 220 mm2 = =
Ast1 + Ast2 467 + 219.7
`
=
687 mm2
Horizontal steel inside face = Ast1 + Ast2 Ast1 0.53 x 10 ^7 = 150 x 0.79 x 151 = Ast2
Total Ast
= = = =
Provide Y
Sterling Wilson Ltd.
12 @
295 mm2 3 x 10 ^4 150 224 mm2 Ast1 + Ast2 295 +
150 c/c
223.9
`
=
Ast provided =
3
519.3
mm2
754 mm2 >
686.9 mm2 OK
DOC.NO:
M2011EP008A-88
Design calculation For Burnt Oil pit
REV R0
Area of Vertical steel required = M / t j d (For Maxm values of BM) Vertical steel (Outside face)
=
0.8 x 10 ^7 150 x 0.79 x
Vertical steel (Inside face)
=
1.77 x 10 ^7 150 x 0.79 x
=
410 mm2
=
900 mm2
163
163
Provide Y
12 @
100 c/c
Ast provided =
1131 mm2 (Inside face)
Provide Y
12 @
100 c/c
Ast provided =
1131 mm2 (Outside face)
Mimimum steel required 0.3 for 100mm to 0.2% for 450mm For thickness of
(Cl. 7.1 IS 3370 part IV)
200 m m m imim um steel shall be 0.244 %
Minm Area of steel required = Design of top slab. Thick = 100 Loads Span = 4.20 m
0.244 x
d=
Live Load
= . . = 0.1 T/m2
Total Load
= 0.35 T/m2
(10% reduction for HYSD steel)
489 mm
200 x 1000 = 100
< 4.40
1131
65 mm =
.
Designing as a two way slab for Ly/Lx =
x =
1.0
Maximum BM
=
0.056
0.056 x
Table 26 IS 456 0.35 x
4.20
2
= 0.35 TM
Area of steel required = M-Tx / t j d + T/t (For Maxm Values of BM) Ast1 required
= = Ast2
Total Ast
Provide Y
10 @
0.35 x 10 ^7 - 3.36 x 10^4 x 100 150 x 0.79 x 65 12.678 mm2 = =
3.36 x 10 ^4 150 224 mm2
= =
Ast1 + Ast2 12.7 + 223.9
200 c/c
`
=
Ast provided =
Provide minm reinforcement in bottom of slab Ast = 0.2 x Provide Y
1000 x 100 = 100 10 @ 200 c/c
Sterling Wilson Ltd.
OK
236.6
mm2 236.6 mm2 OK
393 mm2 > For
100 mm
p=
0.200 %
200 mm2 Ast provided =
393 mm2 >
4
200 mm2 OK
DOC.NO:
M2011EP008A-88
Design calculation For Burnt Oil pit
REV R0
Design of base slab.
200 Thick
d=
170
Critical - when tank is full Weight of Weight of Weight of Weight of
Roof slab wall oil base slab
= 0.10 x 4.40 x = 4 x 4.40 x = 2.7 x 4.00 x = 0.2 x 4.90 x
Total Load
=
85.65 T
Upward pressure
=
85.65 /
Net pressure
= 3.6
-
Designing as a two way slab for Ly/Lx =
4.90 0.9
4.40 0.20 4.00 4.90
2
x
1.0
Maximum BM causing tension on liquid side
x 2.5 = x 3.4 x 0.9 = x 2.5 =
4.84 x 2.5 38.9 12.01
= 3.57 T/m2 2.7
-
x =
0.056
=
0.2
0.056 x
x
T = 29.92 T T T
(250mm projection on each side) 2.5
= 0.64 T/m2
Table 26 IS 456 0.64 x
4.40
2
= 0.69 TM
Area of steel required = M-Tx / t j d + T/t (For Maxm Values of BM) Ast1 required
=
0.69 x 10 ^7 - 3.36 x 10^4 x 100 150 x 0.79 x 170 .
Ast2
=
3.36 x 10 ^4 150 224 mm2
= Total Ast
=
Ast1
= Provide Y
10 @
+
Ast2
175 +
223.9
150 c/c
`
=
Ast provided =
Provide minm reinforcement in bottom of slab Ast = 0.25x 1000 x 100 Provide Y
