Business Requirements
For the
Distribution System Pressure
Recorder Upgrade
Information Services
Distribution System Pressure Recorder Upgrade
Business Requirements
Table of Contents
1
INTRODUCTION ..........................................................................................................................3
1.1
1.2
1.3
1.4
2
OVERALL DESCRIPTION ............................................................................................................6
2.1
2.2
2.3
2.4
2.5
3
Project Perspective, Functionality and Benefits .............................................................................. 6
Conceptual Diagram ........................................................................................................................ 6
User Roles and Functions ................................................................................................................ 7
Constraints ....................................................................................................................................... 7
Assumptions and Dependencies ...................................................................................................... 8
SPECIFIC REQUIREMENTS .........................................................................................................9
3.1
3.2
3.3
3.4
3.5
3.6
4
Purpose............................................................................................................................................. 3
Scope................................................................................................................................................ 3
Definitions, Acronyms, and Abbreviations...................................................................................... 4
Document Conventions/Requirements Traceability ........................................................................ 5
Business Requirements .................................................................................................................... 9
System Interface Requirements ..................................................................................................... 10
Performance Requirements ............................................................................................................ 11
Security Requirements ................................................................................................................... 11
Support Requirements.................................................................................................................... 11
Training.......................................................................................................................................... 11
DELETED REQUIREMENTS ......................................................................................................12
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Information Services
Distribution System Pressure Recorder Upgrade
Business Requirements
1 Introduction
1.1
Purpose
The purpose of the Business Requirements document is to define requirements
for the Distribution System Pressure Recorder Upgrade project in sufficient detail
that, if those requirements are properly implemented, the critical needs identified
in the Joint Application Development (JAD) sessions for this project will be met.
1.2
Scope
Due to advancements in technology, the method in which PGW monitors pressure
throughout the distribution system has become antiquated. PGW currently uses
paper recording charts at 283 locations (201 regulator stations and 82 standalone)
to measure and record pressure within the distribution system at specific points.
The need to pick up and replace these charts on a weekly basis causes PGW’s
Pressure Force Department to dedicate one employee and one vehicle daily to
the performance of this task. This places an employee on the road eight hours a
day, driving an average of 53 miles per day, which creates a significant cost and
safety risk to PGW. In the event of holidays or bad weather, Pressure Force is
forced to place two employees and two vehicles on the road while juggling crew
assignments and manpower to complete other necessary tasks.
In addition to the inefficient use of manpower and company vehicles, this method
of monitoring the system inherently creates a potential delay in notification of
abnormal or alarm conditions. A pressure problem or other anomaly could
potentially remain unresolved for an entire week. This effectively renders this
method of pressure monitoring to historical recordings as opposed to actively
monitoring. This delay can contributebe attributed to added safety risks and the
inability to resolve an issue prior to it being elevated into an alarm condition or
accident.
Finally, the accuracy of paper chart recorders is significantly less than the modern
instrumentation available on the market. The improved accuracy will help PGW’s
Network Analysis group to model the system based on necessary settings for
seasonal weather conditions.
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Distribution System Pressure Recorder Upgrade
1.3
Business Requirements
Definitions, Acronyms, and Abbreviations
The table below defines all terms, acronyms, and abbreviations referenced in this
document.
Term
Definition
Digital Chart
Recorder
Transducer connected to electronics that takes sample
pressure readings at set intervals. The pressure
readings are transmitted to a centralized location on a
set schedule, typically once or twice a day.
DMZ
Demilitarized Zone is a computer host or small network
inserted as a neutral zone between a company's
private network and the outside public network. It
prevents outside users from getting direct access to a
server that has company data.
HMI
Human Machine Interface. (SCADA operations
displays.)
MODBUS
Network communication protocol
Paper Chart
Recorder
Pressure recording device, where the gas pressure
moves a physical pen that traces the pressure reading
onto a circular chart.
Real-time
Transmitter
Pressure transducer, connected to electronics that
transmits real time pressure data.
Regulator Station
Where gas is regulated down from a higher pressure
system into a lower pressure system. These stations
consist of 2 regulators: a worker regulator and a
monitor regulator.
VPN
Virtual Private Network (Encrypted dedicated network
connection not shared by anyone else)
In WC
Inches of Water column (Pressure Unit)
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1.4
Business Requirements
Document Conventions/Requirements Traceability
1.4.1
Traceability
To facilitate forward and backward traceability, all requirements are given a
unique identifier (e.g., 3.1.11.2) that will remain with the requirement throughout
the life of this project (for this software release and all that follow). To maintain
these unique identifiers, requirements are added and deleted as follows:
Added Requirements: Any requirement added after the first approved
version of this document is inserted at the end of the appropriate section.
The version indicator, “[vX.X],” appears after the requirement to identify the
document version in which the requirement was added.
Deleted Requirements: For any requirement deleted after the first
approved version of this document, the requirement text is replaced by the
word “deleted” and the requirement text is moved to section 4 Deleted
Requirements. The unique identifier remains attached to the deleted
requirement in the document.
1.4.2 Prioritizing Requirements
Priority identifiers ([MH], [SH], or [NH]) appear at the end of each requirement.
Requirements are prioritized based on the following definitions:
Must Have [MH]: Essential to the project and must be implemented in an
agreed manner before the system can be released. These requirements
are non-negotiable.
Should Have [SH]: Important to the project and should be implemented if
at all possible. Implies that the system is not unacceptable if these
requirements are absent.
Nice to Have [NH]: Beneficial to the business/project, but not necessary
for the project to succeed. These requirements are negotiable based on
timeline, scope, risks, and availability of qualified resources.
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Distribution System Pressure Recorder Upgrade
Business Requirements
2 Overall Description
2.1
Project Perspective, Functionality and Benefits
The Distribution System Pressure Recorder Upgrade Project directly supports several of
the corporate goals and objectives established by PGW. The following table lists the
business goals and objectives that the Distribution System Pressure Recorder Upgrade
Project supports and how it supports them:
Business
Goal/Objective
Description
Timely and accurate
reporting
Electronic pressure monitoring will allow real-time and
accurate reporting of all system test points and regulator
stations.
One less employee dedicated to chart collection. Reduced
Improve staff efficiency maintenance calls for replacing pens, batteries, stuck pen,
clocks, etc.
Reduced safety risks
Safety risks associated with operating a vehicle will be
reduced by removing 2080 hours of a vehicle on the road.
Reduce overhead
costs
PGW will no longer need to stock paper charts, pens, clocks,
and batteries associated with paper chart monitoring. Also,
Pressure Force supervisors will no longer be required to
review charts daily.
Local and Federal
Codes
With this project, PGW will continue to meet and exceed all
local and federal codes regarding Distribution system
pressure monitoring (e.g., CFR §192.741).
2.2
Conceptual Diagram
PGW Enterprise
PGW Isolated Network
Wireless Network
Field Equipment
Enterprise User
HMI
Database Server
Network Communication
Output to Database Server
Router / Gateway
Firewall
DMZ
T1 Input from Verizon
T1 Output to PGW
*VPN*
Wireless connection with
field device modem
Wireless connection
Serial connection to wrieless modem/
radio
MODBUS Pressure Recorder
Senses pressure from pipeline
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2.3
2.4
Business Requirements
User Roles and Functions
Manager, Pipeline Integrity & Press Control - Shall oversee the entire
system process.
Instrumentation Analyst (System Administrator) - Will oversee the entire
system from a functional aspect. Will be responsible for system changes
and addition/subtraction of points. Will also receive system alerts/alarms.
Supervisor, Pressure Force - System user and will receive alerts and
alarms.
Instrumentation Technician - Responsible to maintain end points including
calibrations.
Pressure Foreman - Needs to be able to access current and recent
pressure recordings.
Senior Pressure Mechanic - Needs to be able to access current and recent
pressure recordings.
Pressure Mechanic - Needs to be able to access current and recent
pressure recordings.
Report writer - Responsible for creating new reports and updating existing
reports and data extraction.
Data viewer - View-only access to data and reports.
Constraints
There are limited Pressure Force resources available to install the electronic
pressure recorders.
There are limited Information Services resources available to support the
Distribution System Pressure Recorder Upgrade Project and other, ongoing,
IS initiatives.
There are installation temperature restrictions.
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2.5
Business Requirements
Assumptions and Dependencies
2.5.1 Assumptions
All staff and employees will be trained accordingly in their respective
responsibilities pertaining to the distribution pressure monitoring system.
Funding will be available for training.
Funding will be available for purchasing the hardware and software required
for receiving, interpreting, and monitoring pressure data.
All involved departments will provide necessary support for successful
project completion.
Project has executive-level support and backing.
2.5.2 Dependencies - None
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Business Requirements
3 Specific Requirements
This section contains all software requirements in sufficient detail to enable developers to
design a system to satisfy those requirements and testers to verify that the system satisfies
those requirements.
3.1
Business Requirements
3.1.1 Field
3.1.1.1 Test Points (38)
3.1.1.1.1
3.1.1.1.2
3.1.1.1.3
3.1.1.1.4
1 pressure input, pressure recorder 0 – 15in WC or 0 – 10psig [MH]
0.5% span accuracy. [MH]
Recorder shall be battery powered. [MH]
Recorder shall communicate over a secure, reliable, and wireless
network. [MH]
3.1.1.2 Regulator Stations (196)
3.1.1.2.1
3.1.1.2.2
3.1.1.2.3
3.1.1.2.4
2 pressure input, pressure recorder 0 – 1in WC or 0 – 10psig and 030psig. [MH]
0.5% span accuracy. [MH]
Recorder shall be battery powered. [MH]
Recorder shall communicate over a secure, reliable, and wireless
network. [MH]
3.1.1.3 Field Users
3.1.1.3.1
3.1.1.3.2
3.1.1.3.3
3.1.1.3.4
Need to have access to see live readings. [MH]
Instrument technician shall be trained on the calibration procedure.
[MH]
Shall be able to recall 24 hours of recent history [MH]
Local system configuration (See 3.2.1.2 Local Access) [MH]
3.1.2 Office
3.1.2.1 Hardware (Handle and secure the signals from the field)
3.1.2.1.1
3.1.2.1.2
3.1.2.1.3
3.1.2.1.4
3.1.2.1.5
Open to vendor hosting
Router to receive the field signals. [MH]
Server preferably compatible with Windows Server 2012 and VMware.
[NH]
Network equipment (Dependent on hosting decision)
If vendor hosted, provide ability to store the data internally for minimum
of 5 years. [MH]
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Distribution System Pressure Recorder Upgrade
3.1.2.1.6
Business Requirements
Handheld device [NH]
3.1.2.2 Software
3.1.2.2.1
3.1.2.2.2
3.1.2.2.3
3.1.2.2.4
3.1.2.2.5
3.1.2.2.6
Connections made to touch points (see 3.2.2) [NH]
Remote system configuration (See 3.2.1.1) [MH]
Local system configuration (See 3.2.1.2) [MH]
Compatible with Windows 7 [MH]
Preferred compatibility with VMware [NH]
Database SQL or Oracle [MH]
3.1.2.3 Reports and Forms
3.1.2.3.1
3.1.2.3.2
Stock reports shall be included with the initial system build. [MH]
A reporting tool shall be available to create ad-hoc and standard reports
as required. [NH]
3.1.2.4 Alarms
3.1.2.4.1
3.1.2.4.2
3.2
Alerts shall be sent via electronic communication to identified
employees based on user roles. [MH]
Alerts need to be clearly visible on local monitoring software. [MH]
System Interface Requirements
3.2.1 User Interfaces
3.2.1.1 Remote access from PGW office 24/7/365 [MH]
3.2.1.2 Local access in field [MH]
3.2.2 Software Interfaces
3.2.2.1 ArcGis (ESRI) [NH]
3.2.2.2 SynerGEE Network Analysis Software (“Stoner”) [NH]
3.2.2.3 Reporting [MH]
3.2.3 Communications Interfaces
3.2.3.1 Shall be a secure, reliable, and wireless network [MH]
3.2.3.2 Network shall be able to communicate with backup to alternate site [MH]
3.2.3.3 Must support security protocols necessary to ensure data integrity and
confidentiality [MH]
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Distribution System Pressure Recorder Upgrade
3.3
Business Requirements
Performance Requirements
3.3.1 System must be available 24/7. [MH]
3.3.2 Archives must be kept for 5 years. [MH]
3.3.3 Must support data and configuration backups [MH]
3.4
Security Requirements
3.4.1 User Authentication for remote access [MH]
3.4.2 User Authentication for local access [NH]
3.4.3 Encrypted transmissions [NH]
3.4.4 Access and Activity Logs [NH]
3.5
Support Requirements
3.5.1 Software updates and patches [MH]
3.5.2 Technical support during business hours [MH]
3.6
Training
3.6.1 Field End Users [NH]
3.6.2 Office End Users [NH]
3.6.3 Core Team [MH]
3.6.4 Manuals and documentation [MH]
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Distribution System Pressure Recorder Upgrade
Business Requirements
4 Deleted Requirements
Date
Approved By
Requirement
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