tank loading data explanation
DESCRIPTION
Tank Loading Data ExplanationTRANSCRIPT
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STATIC EQUIPMENT SECTION
TANK LOADING DATA Basic Concepts
INTER DISCIPLINE TRAINING August 20, 2009
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OBJECTIVE
To understand the different factors
affecting tank loading
To learn the basic philosophy in analyzing
the different loadings in the tank
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Interface with Civil to Produce Loading
Data
CIVIL STATIC
Mechl D/S & Loading Data
Basic Data
a. Wind Speed
b. Wind Zone
c. Site Class
d. Ss / S1
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Typical Tank L/D Output
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Empty Weight without Insulation
WE = Empty weight without insulation, (Ton)
Bottom Plate
Shell Plate
Roof Plate
Wind Girder
Appurtenance
= Bottom plate wt. + Shell plate wt. +
Roof plate wt. + Wind girder wt. +
Appurtenance wt.
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Total Weight
WT = Total weight, (Ton)
Bottom Plate
Shell Plate
Roof Plate
Wind Girder
Appurtenance HLL
Insulation
= Empty wt. w/o insulation, WE +
Insulation wt. + Liquid operating wt.
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Horizontal Force by Wind
FW = Horizontal force due to wind, (Ton)
Note:
a) FWR or FWS is the wind horizontal force
w/c is the wind pressure at a certain height
multiply by the projected area normal to
wind.
b) FW varies depending on the project
(i.e. constant wind pressure or varying wind
pressure)
FWR
FWs
FW = FWR + FWS = qz x G x Cf x Af ---> NSCP 5th ed, 2001
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Overturning Moment by Wind
MW = Overturning moment due to wind,
(Ton-m)
FWR
FWs h2
h1 MW
MW = (FWS x h1) + (FWR x h2)
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Horizontal Force by Earthquake
FE = Horizontal force due to earthquake,
(Ton)
= Seismic base shear V (API 650, App.E)
API 650, Appendix E Method:
V = sqrt (Vi2 + Vc2)
Where:
Vi = Ai * WT
Vc = Ac * Wc
Ai = impulsive design response spectrum acc.
Ac = convective des. response spectrum acc.
WT = total tank wt. including operating liquid
Wc = sloshing liquid wt.
FE (V)
HLL
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Overturning Moment by Earthquake
Shell Pressure
MP = Overturning moment by earthquake
shell pressure, (Ton-m)
= Ringwall or slab moment (API 650,
App. E)
MP = sqrt [(Vi * Xi)2 + (Vc * Xc)2]
Where:
Vi = impulsive base shear
Vc = convective base shear
Xi, Xc = moment arms
API 650, Appendix E Method:
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Overturning Moment by Earthquake
Bottom Pressure
MPB = Overturning moment by earthquake
bottom pressure, (Ton-m)
Note: This is a Japanese caln method (i.e. Shoubou Hou Tokutei Okugai). This method
is related to DW1 (bottom plate pressure) at
earthquake condition.
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Overturning Moment by Earthquake
ME = Total Overturning moment by
earthquake, (Ton-m)
ME = MP + MPB
ME
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Increased Line Load
T = Increased line load by overturning
moment due to earthquake shell
pressure, (Ton/m)
T = MP / (pi * D2 / 4)
where:
D = tank inside diameter
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DW1
HLL
Pressure at Base Plate, DW1
@ Operating Condition (Liquid Height = HLL):
1. Empty @ No Pressure: DW1 = Bottom plate wt per unit area
2. Full Liquid @ No Pressure: DW1 = Equation 1 + Static head pressure
3. Empty @ Design Pressure: DW1 = Equation 1 + Design pressure
4. Full Liquid @ Design Pressure: DW1 = Equation 2 + Design pressure
= Equation 3 + Static head pressure
5. Full Liquid @ Test Pressure: DW1 = Equation 2 + Test pressure
@ Hydro & Pneumatic Test (Water Height = Tank Height):
@ Earthquake Condition:
----1 ----4 ----3 ----2 ----5
----6
----7
6. Maximum:
7. Minimum:
This value is calculated in consideration of vertical acceleration and MPB. Weight of bottom plate and liquid are factors based on the acceleration.
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W1 W1
Loads Along the Shell, W1
@ Operating Condition (No Wind):
1. Empty @ No Pressure: W1 = [(WE + Insulation wt Bottom plate wt) * (1/pi*D)] + [Live Load * (pi*D)]
2. Full Liquid @ No Pressure: W1 = Same as Equation 1
3. Empty @ Design Pressure: W1 = Equation 1 [Design pressure * (pi*D)]
4. Full Liquid @ Design Pressure: W1 = Same as Equation 3
@ Hydro & Pneumatic Test (No Wind):
----1 ----2 ----3 ----4 ----5
----9 ----8 ----7 ----6 ----10 ----11
5. Full Liquid @ Test Pressure: W1 = [(WE Bottom plate wt) * (1/pi*D)] - [Test Pressure * (pi*D)]
Note: Live Load = 1.2 kPa
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W1 W1
Loads Along the Shell, W1 (cont)
@ Operating Condition (Max. Wind):
6. Empty @ No Pressure: W1 = Equation 1 + [MW / (pi*D2/4)]
7. Full Liquid @ No Pressure: W1 = Same as Equation 6
8. Empty @ Design Pressure: W1 = Equation 6 [Design pressure * (pi*D)]
9. Full Liquid @ Design Pressure: W1 = Same as Equation 8
@ Hydro & Pneumatic Test (50% of Max. Wind):
----1 ----2 ----3 ----4 ----5
----9 ----8 ----7 ----6 ----10 ----11
10. Full Liquid @ Test Pressure: W1 = Equation 5 + [0.5 * MW / (pi*D2/4)]
@ Earthquake Condition:
11. Full Liquid @ Design Pressure: W1 = Equation 1 +
Increased line load, T [Live Load * (pi*D)]
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Loads on Anchor Bolts, W2
W2 W2
@ Operating Condition (No Wind):
1. Empty @ No Pressure: W2 = 0 ----> No uplift internal pressure
2. Full Liquid @ No Pressure: W2 = Same as Equation 1
3. Empty @ Design Pressure: W2 = {[WE + Insulation wt Bottom plate wt] + [(Live Load - Uplift due to internal pressure) * (pi*D2/4)]} / No. of Anchor Bolts
4. Full Liquid @ Design Pressure: W2 = Same as Equation 3
@ Hydro & Pneumatic Test (No Wind):
5. Full Liquid @ Test Pressure: W2 = {[WE Bottom plate wt] - [Uplift due to test pressure * (pi*D2/4)]} / No. of Anchor Bolts
----6
----1 ----2 ----3 ----4 ----5
----9 ----8 ----7 ----10 ----11
12----
13----
Note: 1. If weight resisting uplift is greater than uplift pressure,
W2 is zero.
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Loads on Anchor Bolts, W2 (cont)
W2 W2
@ Operating Condition (Max. Wind):
6. Empty @ No Pressure: W2 = {[WE + Insulation wt Bottom plate wt] + [Live Load * (pi*D2/4)] - [4 * MW / D]} / No. of Anchor Bolts
7. Full Liquid @ No Pressure: W2 = Same as Equation 6
8. Empty @ Design Pressure: W2 = {[WE + Insulation wt Bottom plate wt] + [(Live Load - Uplift due to internal pressure) * (pi*D2/4)] [4 * MW / D]} / No. of Anchor Bolts
9. Full Liquid @ Design Pressure: W2 = Same as Equation 8
@ Hydro & Pneumatic Test (50% of Max. Wind):
10. Full Liquid @ Test Pressure: W2 = {[WE Bottom plate wt] - [Uplift due to test pressure * (pi*D2/4)] - [0.5 * 4 * MW / D]} /
No. of Anchor Bolts
----6
----1 ----2 ----3 ----4 ----5
----9 ----8 ----7 ----10 ----11
12----
13----
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Loads on Anchor Bolts, W2 (cont)
W2 W2
@ Earthquake Condition:
----6
----1 ----2 ----3 ----4 ----5
----9 ----8 ----7 ----10 ----11
12----
13----
11. Full Liquid @ Design Pressure : W2 = {[WE + Insulation wt Bottom plate wt] - [Uplift due to internal pressure * (pi*D2/4)]
- [4 * ME / D]} / No. of Anchor Bolts
@ Uplift for Internal Pressure (API 650, F.7.5):
12. No Wind Condition : W2 = {[WE + Insulation wt Bottom plate wt] - [1.25 * Uplift due to test pressure * (pi*D2/4)]} / No. of Anchor Bolts
13. Max. Wind Condition : W2 = {[WE + Insulation wt Bottom plate wt] [1.5 * Uplift due to design pressure * (pi*D2/4)] [4 * MW / D]} / No. of Anchor Bolts