Engineering And Design

Exhaust Stack

Handling Analysis

Introduction

A structural analysis was performed on the Exhaust Stack of SmA Gas Turbine

Generator to evaluate the strength and stability of the part while lifting and

it should fulfil the requirement criteria outlined in Ref. [S1], Ref. [S2] and Ref. [S3].

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Part Identification

Ref. [S1], Ref. [S2] and Ref. [S3].

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Materials Information

Material Name: ASTM A 240 Stainless Steel Type 316/316L

All parts in the FE model have the same materials properties

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Results of FEA

Exhaust S1 (INSTALLATION)

Results displayed are based on 4g consideration

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Results of FEA

Exhaust S2 (LIFTING)

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Results of FEA

Exhaust S2 (INSTALLATION)

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Results of FEA

Exhaust S3 (LIFTING)

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Results of FEA

Exhaust S3 (INSTALLATION)

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Sling Tension

Maximum sling tension calculation

S1 - lifting (example for 6G)

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Sling Tension Information

The table shows the maximum tension sling is 148220.09N

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Selection Of Slings And Shackles

Minimum required lifting capacity of the sling 148220.09N = 15.11 tonnes

Selected shackle: G-2130, Bolt type anchor shackle

with 1.5" nominal size and load limit of 17 tonnes

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Scaffolding

Scaffolding is considered one of the most essential parts in building construction, allowing a support structure to be erected quickly.
Finite Element Analysis (FEA) can be adopted in order to validate the strength and stability of the said scaffolding. The following load cases can be done using FEA

Linear Static Analysis

Linear Static Analysis can be used to analyze the linear stress and
strain when subjected to weight of the worker and their tools.

Linear Buckling Analysis

Linear Buckling Analysis is the analysis used to predict the load level,
when applied will cause a sudden loss in stiffness; sudden large
increment of displacement at the said load.

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Result: Linear Static 2 tier

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Result: Linear Static 2 tier

The critical area seems to rely on the T joint of the scaffolding
structure with a value of 430 Mpa.

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Result: Linear Static 4 tier

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Result: Linear Static 4 tier

4 tier seems to have a similar stress distribution, but with slightly
higher maximum stress at T-joint

Conclusion

Linear reluctant maximum stress is less than 1% difference between 2 tier
and 4 tier scaffolding

Linear buckling analysis, when conducted to both assy shows a significant
difference of about 40% in terms of loading before buckling was predicted.
This analysis can be further refined using Non-Linear Buckling Analysis, in
which the loading is applied at a small rate until buckling happens but
it shall require a more computational power

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Flow Analysis of Valve

Geometry and Boundry Condition

Opening of Valve

Full open = 50mm

Current open = 37mm (74%)

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Flow Simulation

Equation Flow Coefficient

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Q is the rate of flow (expressed in US gallon
per minutes)

SG is the specific gravity of the fluid
(for water = 1);

ΔP is the pressure drop accross the valve
(expressed in psi)

Flow coefficient, Cv value is obtained

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