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UGI Relief Capacity Spreadsheet
Kristopher Aurand & John Toumeh
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About UGI
• UGI is dedicated to the safe and reliabledelivery of energy to our customers and to themany communities we serve. We strive todeliver this fundamental need through best-in-class safety, operations, products and services.
• UGI provides natural gas service to some700,000 customers in 45 counties inPennsylvania and one county in Maryland.
• UGI operates approximately 12,000 miles ofDistribution and 300 miles of Transmissionpipeline.
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UGI Brief History
• In the 2000’s, UGI nearly doubled in sizethrough the acquisition of two companies.
• Each of these acquisitions had unique anddistinct processes and methods.
– Stations located in major cities as well as remotelocations
• Since acquiring these additional companies, UGIhas worked on standardizing processes andpractices.
• Case in point: UGI’s management of RegulatorStations.
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Regulator Stations
• UGI operates approximately 1100Regulator Stations that requireannual Relief Capacityverifications.
• Wide variety of station design,component specifications, andvintage.
• Processes must be in place tocapture, retain, and reviewRegulator Station components.
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Applicable Federal Codes• 192.199 – Requirements for design of pressure relief
and limiting devices.
– Pertains to the design of a pressure Relief Valve.
• 192.201 - Required capacity of pressure relieving andlimiting stations.
– Each Pressure Relief Valve installed to protect apipeline must have enough capacity and be set tooperate…
• 192.743 - Pressure limiting and regulating stations:
Capacity of relief devices.
– Perform a capacity check at intervals not exceeding15 months. Can use initial calculations if stationpiping has not been altered.
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Path to Standardization
• Beginning:
– Decentralized
– Relief Capacitycalculations performeduniquely based onlocation
– Various methods utilized,assumptions being made
– Retention process wasunique to each localizedarea
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Path to Standardization – Regulator Catalog
• Catalog (database) created and used bytechnicians to perform annual regulatorinspections.
• UGI developed this catalog for each Regulatorbeing used in our system to include.
– Manufacturer
– Size
– Style
– Orifice Size
– Flow Coefficient Values
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Path to Standardization – Regulator Catalog
• Catalog was the basis forthe spreadsheet
– All data used to calculaterelief capacity found in thecatalog
• All Regulator updates oradditions are funneledthrough one centralcontact.
– Verifies literature andupdates the catalogaccordingly
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Path to Standardization – Canvas Reg. Stations
• In 2015 UGI performed a canvas of all RegulatorStations which had a Relief Valve installed.
• Performed Field Review - Physically went toeach station:
– Took pictures of components• Valves, Regulators, Station Piping
– Drew a sketch that included exact measurements ofall piping dimensions
• Diameter, Length, Flanges, Valves, Tees, etc
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Path to Standardization – R.V. Spreadsheet
• Several Iterations of a Relief Valve CapacitySpreadsheet were created.
• In 2016 UGI Engineering team began to zero inon the final product.
– User Inputs kept to a minimum• Allows for standardization of calculations
– All Calculations performed “behind the scenes”• Formulas are locked for all users
– Regulator Catalog was Linked to Spreadsheet• Allows for refreshing of data whenever a new Regulator was
added
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Relief Valve Spreadsheet
• Simple push buttonsto controlspreadsheet
• Contain dialogueboxes to guide user
• Has ability to identifyerror in user input,and then providesbasic troubleshooting
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Relief Valve Spreadsheet
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Relief Valve Spreadsheet
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Relief Valve Spreadsheet
• Spreadsheet considers pressure drop throughstation piping, up to the inlet of Relief Valve.
• Ensures piping back to Regulator does notexceed emergency pressures.
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Relief Valve Spreadsheet• Relief valve vent stack
• Piping downstream of relief valve taken intoconsideration
• Vent stack back pressure• Determines flow characteristics
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Relief Valve Spreadsheet
• Summary of calculations
– Maximum Pressure Buildup
– Adequate Relief Capacity
– Date of Calculation, Electronic Signature
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Roll Out Process
• Spreadsheet was extensively tested
– Compared to Manufacturer Literature, HandCalculations, etc
• Held Training Sessions for all EngineeringGroups
– Fielded Questions/Concerns
– Showcased the spreadsheet
– Provided example calculations
– Reinforced supplementary documents Engineers havewhen performing the calculations
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Standardized Method
• Spreadsheet was initially used to verify allRegulator Stations that utilize a R.V. as primaryOPP.
– A very thorough way to “Vet” spreadsheet
• Regulator Catalog was extensively updatedonce all Engineers were utilizing one centraldatabase
• Utilized for all Regulatory Audits
– Helps auditors when they can refer to 1 documentused throughout the company.
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Current State of Affairs
• Approximately 9200 regulator catalog entries todate.
• Standardized across all UGI territories.
• All calculations are centrally and locally stored.
• Regulator Catalog updated regularly.
• Continuing to provide ongoing support toEngineers
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Questions