TSE SCADA Design presentation new

Pre and Post Contract Professional Consultancy Services for

TSE SCADA Automation

PRESENTATION:

Charles Chandler his role in Hyder for this project is to:

• Review the technical content • Assist with delivering the project to you.

WHAT DOES THIS PRESENTATION COVER?

• Introduction

• Operations analysis

• Valves, flow meters & leak detection

• RTU and services

• Central SCADA

• Future expansion

• Summary

Introduction

• This presentation concentrates on the Preliminary Design Report

• I will speak about the Operations analysis

• Mohamed ElSirsy will follow on and speak about the valves, flowmeters & leak detection

• Nasir will follow on and speak about the RTU and services

• I will finish by speaking about the Central SCADA and summarize the benefits

• Questions please hold if possible for each speaker at the end of his talk

Operations analysis

TSE1 & TSE2. TSE3 comes on line in the future.Existing sources are sufficient currently, BUT supply can be interrupted by fault or process failure at source. Operations response will be more effective with a strategy of:• Early detection and indication of location.• Detection of service failure (low pressure) remote from the fault• Means of rationing supply.SCADA will help by:• Monitor flow and pressure to detect major leaks and detect areas where

pressure is low (below 30mWG). • Remote control of valves so that areas can be isolated and returned back

into service easily.

Operations analysis

RECOMMENDATIONS ARE:• 12 zones, each of which can be isolated by valves which will be motorised

with facility to operate from the SCADA HMI• Flow meters on key pipelines providing good indication of demand pattern

and for identifying exceptional conditions• Pressure transmitters associated with the flow meters to provide service

pressure indication• Pressure transmitters associated with key transmission lines, with

particular functionality of identifying major leaks.• Automate in-line valves• Slow operation of valves for surge suppression• Semi-automatic exercise of automated valvesAll the above work will be undertaken at 135 sites, each of which includes an existing valve chamber.

Operations analysis

Operations analysis

CATEGORY OF THE LOCATION OF IN-LINE VALVES

INDICATORS OF USEFULNESS

Washouts Major consumers

Congested area remote from the operations centre

See note *

Area where leak/fault could cause serious disruption or damage

See note *

Main transmission pipelines

Frequency of occurrence

Infrequent Infrequent Occasional Occasional Occasional

Risk of leak/fault causing serious disruption or damage

Low LowNo linkage with this category

High High

Reliability of information for remote control

Good Good Medium, relies upon local observation.

Medium, relies upon local observation.

Good, for key sections where leak detection is proposed

Time of response at the site by staff

Long, generally

No linkage with this category

Long, especially when traffic flow is high, areas such as Corniche

No linkage with this category

Medium, generally

CONCLUSIONS

Low priority, subject to comments below

Low priority, subject to comments below

Priority 3

Priority 1Priority 2if both categories apply, for example Corniche & Diplomatic areas

Valve Statistics & feasibility of retrofit

Methodology of Condition Survey:• Asses the condition of the valves, fittings, pipes and valve chamber.• Determine the services available at each valve chamber• Take digital coloured photos of the valve chamber to provide evidence of

the current condition of the valve chamber.• Recording of Northern and Eastern coordinates based on QNG data.• Develop a condition assessment grade of the valve chambers.• The Results of the Condition survey:

Total Number of Proposed valves to be Actuated 241Total Number of Actuators to be supplied (Retrofit) 144

Total Number of complete valves with Actuators to be supplied 96

Total Number of Recommended manual valves to be replaced 52

Valve Statistics & feasibility of retrofit (cont’d)

100mm 150mm 200 mm 300mm 350mm 400mm 500mm 600mm 700mm 800mm 900mm 1000mm0

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Number of Actuators To be Supplied


100

150

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300m

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350m

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400m

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500m

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600m

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700m

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Number of Complete Actuated Valve Set (Valve & Actuator) to be Supplied


100m

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150m

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300m

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Number of RecommendedNew Manual Valves


• Feasibility of Retrofit:• Proceeding through finalizing detail design drawing of the valve

chamber, till now it was found that there is no need for mounting the actuators outside the valve chamber (this will be confirmed after finalizing and settling on number of the valves to be actuated).

• Examples of finalized valve chambers :

Valve Statistics & feasibility of retrofit (Cont’d)

Flow Meter Scheme

• Current Situation: During our investigation survey phase and referring to the

Engineering reports related to this project especially (C 685, C 682, C747 & C682), we have noticed the following:

• Regarding flow meters in the TSE network itself (i.e. excluding the pump stations TSE1 &TSE2), no proper reading were taken for TSE metering along the network.

• The operators presently take potable meter and measure pressure from chambers that have pressure gauges (tapping).

• The presently status of measuring devices is as follows:• Valve chamber No.68 (VC0068) – Pressure gauge connection • Valve Chamber No.77 (VC0077) - Pressure gauge connection

Flow Meter Scheme(cont’d)

• Valve chamber No.G01 & G02 (VC0G01 & VC0G02) - Pressure gauge connection

• Valve chamber No.106 (VC0106) - Pressure gauge connection• Port Roundabout – Meter installed (C685, Rationalization o TSE –

Engineering Report) • Criteria:• For monitoring consumption and system metering, it is desirable to

install permanent flow meters on the flows from:

sources Direct Feed Areas

Pumping Stations Flows to zones

Reservoirs

Flow Meter Scheme (cont’d)

In general, flow meter locations should facilitate day to day system monitoring.

We have suggested 22 flow meter mainly; on the main transmission lines where the flow will split feeding different areas and zones

The number and locations shall be finalized after discussion and agreement with the operation department, encountering all their concerning to achieve proper monitoring and ease of measurement.


• The following points should be considered:• It isn’t possible to predict the exact quantities of future demands within the

greater Doha TSE network, because the final demands are not known in advance by the project developers of the various irrigation and district cooling projects.

• There are some future projects, which are predicted to use TSE which may be cancelled, or conversely, where the scope of TSE usage may greatly increased. There will also be future projects which are not presently identified and have been not allowed for in the demand assessments under this project

• It isn’t possible to state precisely when future TSE demands will actually occur because the actual finish date of all projects utilising TSE cannot be accurately predicted.

• The zoning of the network will need to be modified over time as new demands in the network and the need to match the output of TSE from TSE 1, TSE 2, and TSE 3 necessitate a change in the source of TSE.

Leak Detection Scheme

Proposed Leak Detection Methods Using SCADA• Mass or Volume Balance• Real Time Transient Modeling (RTTM)• Single Pressure Point Analysis

Mass Balance: The Mass balance method of leak detection, also known as line

balance, compensated volume balance, or volume balance, is based on measuring the discrepancy between the incoming (receipt) and outgoing (delivery) product volumes of a particular pipeline segment. During a unit time interval, the volume of product that enters a pipe may not be equal to the measured volume exiting the pipe. The difference is accounted for by uncertainties in line pack and flow measurement

Leak Detection Scheme (cont’d)

• Compared to other leak detection methods, Mass balance is particularly useful in identifying small leaks. However, leaks are generally detected more slowly and flow metering at each end of the line or pipeline segment will not identify the location of the leak.

Real Time Transient Method: The most sensitive, but also the most complex and costly leak

detection method in use is real time transient modeling (RTTM). RTTM involves the computer simulation of pipeline conditions using advanced fluid mechanics and hydraulic modeling. Conservation of momentum calculations, conservation of energy calculations, and numerous flow equations are typically used by the RTTM system.


• First, the pressure-flow profile of the pipeline is calculated based on measurements at the pipeline or segment inlet.

• Next, the pressure-flow profile is calculated based on measurements at the outlet.

• Third, the two profiles are overlapped and the location of the leak is identified as the point where these two profiles intersect. If the measured characteristics deviate from the computer prediction, the RTTM system sends an alarm to the pipeline controller.

• The more instruments that are accurately transmitting data into the model, the higher the accuracy of and confidence in the model.


• The distinct disadvantages of this method are the costs associated with implementing RTTM and the complexity of the system, which requires numerous instruments and extensive controller training and system maintenance.

• Single Pressure Point Analysis:• The most widely method used to detect the depressurization that

accompanies a leak. The most common implementations of this are detecting pressures that become abnormally low, and detecting rate of pressure change that become too low (pressure falling too rapidly). These systems implemented as software or hardware solutions, and may be remote from the transducers.


The implementation of a single point pressure is a fairly straightforward matter; as the pressure measurements are obtained they are placed in a circular buffer where the most recent and all numbers of date point’s values are kept.

Each pressure measurement used in the procedure is treated individually, and as many measurements as desired or available may be analyzed. For each measurement the data is partitioned into new and old sets.

The advantage in doing so is to try to maximize both detection speed and sensitivity. By using shorter time periods for the new data partition, which corresponds to putting more data in the old partition, the leak affects the mean of the new data more rapidly. This leads to the reduction of false alarms.

The primary strength of this system is its simplicity. This translates into minimal instrumentation and computer resource requirements and therefore lower overall costs.


Criteria Mass Balance Real Time Transit Modelling

Single Pressure Point Analysis

Water Table No Effect Sensitive No Effect

Condition of Pipe Line Leak Present at installation will not be detected

No effect Leak Present at installation will not be detected

Ease of Operation Easy Complex Straightforward

Time Monitoring Continuous Continuous Continuous

Spatial Resolution Low Excellent Good

Equipment used Two flow meters (on the inlet & outlet)

Flow meters, pressure transducers, sensors and cables

One pressure transducer for each section

Cost Expensive (flow meter on inlet and outlet)

Highly expensive Low Cost (compared with the other 2 methods)

RTU & services

TOPICS:• Electricity Supply• General RTU arrangement• Communication Servise• TSE 1 & TSE 2 RTU

Electricity Supply

Power Supply Sources1- KAHRAMAA Network

Main supply source for all valve chambers2- Solar System

Solar Power System will be considered for the location where KHARAMAA supply can not provided

3- Street Lighting Feeder pillars Street lighting feeder pillar was considered as the main power supply

source. According to the Road department street lighting feeder pillars will not be allowed to be utilized

Power Supply Sources Comparison

KAHRAMAA Solar Power Reliability Good Medium

Effects of climate No effects Some Effects

Maintenance Not Required Required

Installation cost Medium Medium

Ease of installation Easy Complex

Additional Future Load Could be without additional equipments

Additional equipments will be required

Power supply loads

• Typical Actuators power rating

Valve Size - mm

Valve Type Actuator Power Pn (KW)

300 Gate Valve 0.75

400 Gate Valve 1.5

500 Gate Valve 1.5

600 Gate Valve 3.0

700 Gate Valve 0.3

800 Butterfly Valve 0.75



Electrical Load summary

• Typical Maximum Demand Load of a Valve Chamber• vvvv Item Maximum Demand

load - kWActuator 5 *Cabinet Lamp 0.1230V Power Socket 0.5Instrumentation power supply/battery unit

0.1

RTU 0.1Anti- Condensation heater 0.2

Total 6

* Short time demand load at closing end

RTU Main Features

• Support for DNP-3 and modbus as minimum. • Data acquisition from field equipment (digital and analogue

inputs). • Data recording and time stamping (time and date). • Sequence of events recording. • Alarm management (priorities) including report by exception. • Handling data received from control centers. • Initiating commands (digital and/or analogue outputs) and

software routines (pump • Self diagnostics • Communications control including route selection.

RTU Inputs/ Outputs (I/O)

• The Following is a typical signal that will be available at the RTU and will be transferred and displayed on SCADA

Digital Input DescriptionValve Fully Open Valve is in the fully open position

Valve Fully Closed Valve is in the fully closed position

Valve Actuator collective fault signal

Faulty signal from actuator control circuit ( torque fault, motor overheated. Loss of phase ..etc)

Actuator Selector Switch Remote/ Manual

Position of the actuator selector switches at valve chamber

Main Power Supply Available

Healthy main power supply is available

Flowmeter Faulty Faulty signal from flowmeter transmitter

RTU Inputs/ Outputs (cont’d)

High water level in the Chamber

Water is detected in the valve chamber

Battery charger Operating or not

Battery voltage Normal or low

Flowmeter instantaneous flow

Instantaneous reading of the flowmeter

Flowmeter totalized flow Totalized flow indicated in flowmeter transmitter

Pressure transmitter reading

Reading of the pressure transmitter

RTU Communication

• RTU will be communicated with the SCADA centre using • 1- Public Service Network (PSTN)• For Valves chamber outside roundabouts or road islands• 2- Global System Mobile (GSM)• For all valve chamber inside roundabouts

Valve Chamber Location

Number of Valve Chambers

RTU Communication

Road Side 42 PSTN, ISDN

Road Island 29 GSM

Roundabout 61 GSM

RTU Cubicle & site wiring - Option 1

RTU Cubicle & site wiring - Option 2

RTU local controls

ACTUATOR CONTROL:• Surge control 300 seconds• Surge control, and limit power supply, one only to move at any time• Manual control, is on actuator; OK or manual controls in RTU pillar?

Central SCADA

DIAGRAM option 1

Central SCADA

DIAGRAM option 2

Central SCADA

STRATEGIC SUPPLIER CHOICES

• SCADA standard software package/licences

• RTU manufacturer/programming licences & spares

Suggest that this is considered for prequalification of Contractors

Future expansion

TOPICS:New pumping station TSE 3, see Hyder Consulting report “C682 - Doha North Sewerage, Treatment and Associated Works, Volume 4, TSE3 and Rising Mains” of 24 September 2009. Uncertainties include several items where the proposed TSE SCADA project can provide benefits, such as:• The area of network zoning will change over time and might be seasonal. Central

control of the key valves will provide an efficient means of responding promptly to the circumstances.

• The profile of pressure/flow that has to be delivered by stations TSE1, TSE2 and TSE3 depends on monitoring the pressure in the most sensitive parts of the network. The RTU at these sites will provide relevant data and also transmit alarms should abnormal pressure or flow occur.

SCADA system should be capable of accommodating at least 500 sites within the current provision, and expandable thereafter.

Future expansion

Summary

• TSE operations can be made faster and more efficient as a result of the proposed centralized SCADA system. Valves may be operated remotely in response to the circumstances and a full record kept of all states and operator actions.

• The records will enable exceptional events to be analyzed and long term trends to be assessed.

• The historical database can be connected to other asset management and analytical systems that are being developed as an integrated business IT infrastructure for Ashghal and thereby contribute a valuable corporate data archive resource.

• The central SCADA installation will accommodate substantial increases in the number of sites that can be monitored in the future.

TSE SCADA Design presentation new

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