ASME B31.1 POWER PIPING INSPECTION and REPAIR UPDATES

Joe Frey P.E.

Joe Frey, PEPower Practice LeadStress 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)

• BOILER PROPER• BOILER EXTERNAL PIPING

(BEP)• NONBOILER EXTERNAL

PIPING (NBEP)

CODE JURISDICTIONAL LIMITS

• 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

INSPECTION RESPONSIBILITY

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

• In development now

ASME Non-Destructive Examination (ANDE) Personnel Certification Program – National Cert

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 NON-

REQUIRED 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 37-2ACCEPTANCE 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 Chapter VII in time

16

WAP Unit 8 Cold Reheat

June 4, 2003

17

WAP Unit 8 Cold Reheat

June 4, 2003

18

WAP Unit 8 Cold Reheat

July 15, 2003

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)

GENERALManaging safe pipe service begins with the initial project concept and continues throughout the service life of the system.

Thou ShallKnow 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 ASSESSMENTOF CPS

A condition assessment shall be performed periodically based on condition.

Basis for determining extent of assessment and reinspection intervalConsideration of the age of the CPS, the previous documented condition, anticipated operating conditions.

This includes remaining life assessment.

OPERATION & MAINTENANCE PROCEDURESDocumentation of:1.System operating hours and hot,

warm, and cold starts2.Actual operating temperatures and

pressures3.System excursions including pipe

hammers4.Modifications and repairs to CPS5.Hydro pinning requirements

OPERATION & MAINTENANCE PROCEDURESDocumentation of:

6. Maintenance of pipe supports 7.Maintenance of piping system

vents, drains, and relief valves8.Maintenance of steam

attemporators9.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 F22

Verified Carbon Steel