Process Operation and Control Philosophy

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OSE571 Ocean Plant Design

Process O peration and Control Philosophy

Korea dvanced Institute of

Science and Technology

aejun CHAN G([email protected])

ivision of Oce an System Engineering


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Design Procedure and Key deliverablesDesign Procedure and Key deliverables

Design Basis (Philosophy)

Concept Consolidation

Process Flow Diagram

Process Simulation

Equipment Specification

Equipment Design

System Description

Production Availability?

Ocean Systems EngineeringOcean Systems Engineering

Process Operation and

Control Philosophy

P&ID

Layout

HAZOP

Risk AssessmentSafety Studies

Caution: Not universally applicable


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Hazards and S afety Systemsazards and Safety Systems

Accident Controlling Protection

(F&G Detection, ESD, Depressurization, Alarm)

Accident Mitigating Protection

(Active/Passive Fire Protection, Fire/Blast Walls)

Emergency Response

(Escape Route, TR, Evacuation Means,

Rescue Equipment, Emergency Power)

Accident:Fire/Explosion

2 Ocean Systems EngineeringOcean Systems Engineering

Inherent Safety Design(Layout, Inventory, Leak, Ignition)

Basic Process Control

(P, T, F, Surge, Back Pressure)

Preventive Protection

(Structural & Machinery Integrity, Relief, PSV)

Gas Leak

Layered Structure of Safety Systems against Fire and Explosion


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P&ID (W11)

Process Operation and Control Philosophy (W9)

System Description (W4)

Workflow for Process ControlWorkflow for Process Control


Field Implementation

Logic Diagram

Functional Design Specification (W11)


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The key document for operation and control

Operation Philosophy

Big picture of operation

Operation modes defined

Operation philosophy for each mode

Safety instrumentations

What is in the process operation and control philosophyhat is in the process operation and control philosophy


Control Philosophy

Detailed feature

Unit-by-unit description

Control loops defined


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Working principles

Degree of automation

Number of operators required

Operation Philosophyperation Philosophy






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Steady

- Operational cases: loading, offloading, etc.

- Capacity: Max, Normal, Min (turndown)

Dynamic



- -- Shutdown

- Emergency shutdown




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Causes and counter measures


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Detailed feature

Subsystems (units), equipment, components

Control targets and variables

Set points

Control and operation procedure

Control Philosophyontrol Philosophy





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Detailed feature


Follow the main stream

Describe the situation and circumstance where control is required

Describe how to manipulate the components





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Detailed feature



Controlled variables with set point

Manipulated variables


Ocean Systems EngineeringOcean Systems Engineering

Disturbances

Working mechanism


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Why about control of other subsystems like power generation?

Utility: well proven, repeated design Well established control

Process: specific to the facility

New design Need to establish the control algorithm

Who will take care about the followings tasks including P&ID and

logic diagram?

Som e Questionsome Questions


process eng neers

Logic diagram electrical engineers

Functional design specification (W11) to bridge them

Can we make it without knowledge of control theory?

Advanced controls very rare in real process industry (Why?) Fundamental understanding of the process control enough

Process Operation and Control Philosophy

Documents

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