A seguire ci sarà un Seminario di
eccezione.
Un brillante
giovane laureato del Politecnico di BARI del 2001, organizzato dal corso di
laurea in ingegneria meccanica (prof. Ciavarella, già suo relatore di laurea)
dr. ing. Fabio Giove
Technology Director
IMI Severe Service /
CCI Italy S.R.L.
| via G. Leopardi, 26
| 20123 Milano | Italia |
originario di
Gioia del Colle, presenterà una panoramica di alcuni problemi tecnici sulle
"SEVERE SERVICE CONTROL VALVES". La sua azienda progetta e produce
valvole di regolazione per il servizio severo con circa 2100 dipendenti
wordwide (la maggior parte Ingegneri) e 15,700 a livello di gruppo IMI. Il suo confronto con i colleghi laureati a
Los Angeles, San Diego, Tokio, ecc...non lo ha spaventato, ed è stato inserito nel
gotha di 30 (su 2100) esperti della materia. Al momento sta cercando di aprire
un centro ricerca nella provincia di Bari. La classifica Scimagoir (in cui il
Politecnico primeggia da 3 anni per indice di impatto scientifico) lo sta
aiutando molto a cercare di far approvare un investimento su Bari dove non
esiste alcuna presenza dell’Azienda preferendo Bari ai Politecnici piu'
“antichi” del Nord.
Abstract
SEVERE SERVICE CONTROL VALVES.
• What defines severe service control
valves?
There is a Control valve hierarchy, that correctly applies to certain
condition of operations. The simplest is the butterfly, then follows the ball
valve which is an on off valve, that most of the people are trying to transform
into a control. Real control valves are plug or cage guided control.
• Severe service definition
What defines a service severe and what kind of valve to use? First of
all, it is required to define the Application Definition. This is, it is
necessary to Know in what type of plant the valve is installed in. In general,
we should:
– Identify the function of the control
valve in the loop
– Review data sheet and establish
operating parameters based on:
• Specified operating conditions
• Extrapolation between specified conditions
• Historical knowledge of the valve
application and industry
When there are Issues with cavitation and noise, then the service is
extremely severe. A failure can potentially create a loss of production,
therefore we must understand the startup time of the process and how much
problems it creates a shutdown for a non-planned maintenance. Different
industries have different times for start-up or shutdown, which may increase
the severity of the service. An example
• Power plant start-up is 3-4 hours
• Refinery start-up is 1 week
• Waterflood program may take 1+ year. A
loss of time can be hardly recovered.
In some industries the fluid may be more corrosive, because Fluids may
contain solid particles, or the flow and the process require High pressure
drops or Two-phase flows. In this cases, the failure is associated with a
mechanical erosion or crack of components.
In general, the severity of the application is normally associated with
a common Root cause: the excessive trim exit velocity. I will analyze what is
the Velocity control principle and how is this applied to Single stage
pressure drops or multiple stage pressure drops. For this reason it is
essential to calculate the proper speed of the flow in the different areas of the
valve.
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