ASME B31.1 POWER PIPING INSPECTION and REPAIR UPDATES Joe Frey P.E.
Joe Frey, PE Power Practice Lead Stress Engineering Services, Inc. • 30 years experience in the utility industry in design, construction, performance testing, and maintenance of gas, coal, and lignite fired power plants • 20 years of experience providing emergency response for condition assessment and repair of piping and equipment • Involved with EPRI in developing repair methods for the industry • Current Position Chair of ASME B31.1 Power Piping Committee Evaluate equipment damage and determine which equipment can be placed back in service Recommend repairs for other damaged equipment prior to restart
Outline • ASME B31.1 Inspection Requirements • ASME B31.1 Code Development • Appendix V Recommendations • Chapter VII Requirements (Dec 2007)
CODE JURISDICTIONAL LIMITS • BOILER PROPER • BOILER EXTERNAL PIPING (BEP) • NONBOILER EXTERNAL PIPING (NBEP)
INSPECTION RESPONSIBILITY • BOILER EXTERNAL PIPING (BEP) • AUTHORIZED INSPECTOR • THIRD PARTY INSPECTION
INSPECTION RESPONSIBILITY • NON BOILER EXTERNAL PIPING (NBEP) • RESPONSIBILITY OF OWNER OR AGENT OF OWNER • OWNER’S EMPLOYEE • ENGINEERING ORGANIZATION • INSPECTION OR INSURANCE COMPANY
INSPECTOR QUALIFICATIONS • OWNER’S INSPECTOR (NBEP) – TEN YEARS EXPERIENCE • EDUCATION MAY BE USED FOR UP TO 5 YEARS (136.1.4) –ABET ACCREDITED ENGINEERING DEGREE PROGRAM • RECENT CODE CHANGE DEFINED REQUIREMENT FOR EXPERIENCE – OWNER RESPONSIBLE FOR DETERMINATION OF QUALIFICATION OF DELEGATED AGENT
INSPECTOR QUALIFICATIONS • AUTHORIZED INSPECTOR (BEP) – EMPLOYEE OF AUTHORIZED INSPECTION AGENCY (PG-91) – AIA ACCREDITED PER ASME QAI-1
ASME Non-Destructive Examination (ANDE) Personnel Certification Program – National Cert
• In development now
ACCEPTANCE CRITERIA
• ACCEPTANCE CRITERIA FOR REQUIRED EXAMINATIONS ARE MANDATORY – LISTED BY METHOD IN THE CODE • CONTRACT SPECIFICATION MAY REQUIRE TIGHTER ACCEPTANCE CRITERIA – NEEDS TO BE PRIOR AGREEMENT
ACCEPTANCE CRITERIA FOR NON-REQUIRED EXAMINATIONS • ACCEPTANCE CRITERIA FOR NONREQUIRED EXAMINATION IS NOT WITHIN SCOPE OF CODE • PIPING SYSTEM MUST STILL MEET DESIGN REQUIREMENTS – DESIGN ASSUMPTIONS • SAFETY IS THE ISSUE (INTRODUCTION)
INTERPRETATION 7-2 • ACCEPTANCE CRITERIA WHEN RADIOGRAPHY IS NOT REQUIRED • NOT IN SCOPE OF CODE – ENGINEERING EVALUATION OF INDICATIONS – CAUTION ON ACCEPTANCE OF VIOLATIONS OF FABRICATION REQUIREMENTS (DESIGN ASSUMPTION)
INTERPRETATION 37-2 ACCEPTANCE CRITERIA WHEN RADIOGRAPHY IS NOT REQUIRED •AN UPDATED VERSION OF 7-2 •MORE COMPLETE EXPLANATION OF FABRICATION VS DESIGN REQUIREMENTS
ASME B31.1 now addresses the O&M of power piping. The inspection and evaluations methods are acknowledged, but not detailed.
APPENDIX V • Added to B31.1 after Mohave 6/9/85 • Nonmandatory • How to maintain critical piping • Will be where details of condition assessment are introduced into the Code • Details will be moved over into
WAP Unit 8 Cold Reheat June 4, 2003
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WAP Unit 8 Cold Reheat June 4, 2003
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WAP Unit 8 Cold Reheat July 15, 2003
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The WAP 8 CR Seam Weld Failure Prompted Two Industry Reactions: 1. Seal welded cold reheat systems were added to the inspection programs – fatigue cracks 2. ASME B31.1 Code Committee renewed efforts on Appendix V and then began work on a new mandatory operation and maintenance chapter. Chapter VII was published in December of 2007.
ASME B31.1 CHAPTER VII Operation & Maintenance - Contributing Factors •Deregulation has reduced funds and added new players •Plants are being bought and sold •Common industry practice to neglect pipe supports •Lots of stories about being “lucky”
Other Codes with O&M Requirements • B31.4 – 2002 Pipeline Transportation Systems For Liquid Hydrocarbons and Other Liquids (Chapter VII) • B31.8 – 2003 Gas Transmission And Distribution Systems (Chapter V) • B31.11 – 2002 Slurry Transportation Piping Systems (Chapter VII) • High Pressure System HPS 2003 (Section 5000)
GENERAL Managing safe pipe service begins with the initial project concept and continues throughout the service life of the system.
Thou Shall Know the Condition of Thy Condition
OPERATION & MAINTENANCE PROCEDURES The Operating Company shall be responsible for the safe operation and maintenance of their power piping.
Covered piping systems (CPS): Piping systems on which condition assessments are to be conducted. •NPS 4 and larger MS, HRH, CRH, & BF •NPS 4 and larger in other systems that operate above 750F or above 1025 psi. •The Operating Company may include other piping systems
CONDITION ASSESSMENT OF CPS A condition assessment shall be performed periodically based on condition.
Basis for determining extent of assessment and reinspection interval Consideration of the age of the CPS, the previous documented condition, anticipated operating conditions. This includes remaining life assessment.
OPERATION & MAINTENANCE PROCEDURES Documentation of: 1.System operating hours and hot, warm, and cold starts 2.Actual operating temperatures and pressures 3.System excursions including pipe hammers 4.Modifications and repairs to CPS 5.Hydro pinning requirements
OPERATION & MAINTENANCE PROCEDURES Documentation of: 6. Maintenance of pipe supports 7.Maintenance of piping system vents, drains, and relief valves 8.Maintenance of steam attemporators 9.Assessment of deteriorating mechanisms including; creep, fatigue, corrosion, erosion 10.Documentation of condition of CPS
RECORDS The condition assessment reports and any reference documents, such as procedures required by para. 139, drawings and reports, shall be maintained and accessible for the life of the plant.
Verified Carbon Steel Verified F22
