VALVE MANUFACTURERS ASSOCIATION
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Presented By: CFM/VR-TESCO, LLC Scott Smith – SVP & General Manager PowerPoint PPT Presentation


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VALVE MANUFACTURERS ASSOCIATION OF AMERICA TECHNICAL SEMINAR IN-LINE WELD REPAIRS OF VALVE DEFECTS (FAILURE CASES & WELD REPAIR ACTIVITIES PER ASME SECTION 1 AND B31.1 CODE REQUIREMENTS). Presented By: CFM/VR-TESCO, LLC Scott Smith – SVP & General Manager

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Presented By: CFM/VR-TESCO, LLC Scott Smith – SVP & General Manager

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Presented by cfm vr tesco llc scott smith svp general manager

VALVE MANUFACTURERS ASSOCIATION OF AMERICA TECHNICAL SEMINARIN-LINE WELD REPAIRS OF VALVE DEFECTS (FAILURE CASES & WELD REPAIR ACTIVITIES PER ASME SECTION 1 AND B31.1 CODE REQUIREMENTS)

Presented By:

CFM/VR-TESCO, LLC

Scott Smith – SVP & General Manager

Roy Button – Welding Engineer & Specialty Welding (WDI) Division Manager


Our presentation focus

Our Presentation Focus

WHO ARE WE?

  • Continental Field Machining (CFM) formed a valve repair division in 1986 known as “VR-TESCO”.

  • CFM/VR-TESCO is highly focused on disassembly, inspection, repair, and reassembly of valves throughout the Power Generation Sector.

  • Specialized welding and machining equipment has been developed to effectively complete difficult in-line valve repairs.

  • Personnel are given extensive training to perform these activities.


Our presentation focus1

Our Presentation Focus

  • Our presentation focus is on ASME Section 1 and B31.1 Code valve repairs performed within the past (2) two years.

  • In this timeframe, CFM/VR-TESCO has performed major welding and machining repairs on (46) forty-six plus ASME Code large bore valves.

  • The valve sizes have ranged between 12” to 24”.

  • Valves from all the major OEM’s have been included in these repairs.


Our presentation focus2

Our Presentation Focus

  • (21) twenty-one of these valves are Code Boundary valves, hence repairs are performed following guidelines of ASME Section I and National Board Inspection Code and Jurisdictional requirements.

  • (25) twenty-five plus valves were part of the Boiler external piping, hence repairs are performed following guidelines of ASME B31.1.


Original manufacture of valves

Original Manufacture of Valves

  • Valves manufactured for use in Power Generation are produced under the American National Standards as outlined in ASME B16.34.

  • This standard applies to new construction and covers pressure-temperature ratings, dimensions, tolerances, materials, NDE requirements, testing, marking for cast, forged and fabricated valves with flanged, threaded or welding ends.


Original manufacture of valves1

Original Manufacture of Valves

  • It is the manufacturer’s responsibility to provide the purchaser with documentation that details his program compliance in the manufacturing of the products.

  • Requirements for manufacturing may be less stringent than those required for repair of the product.

  • Listed are acceptance NDE criteria for new valves manufactured.


Asme b16 34 acceptance criteria

ASME B16.34 Acceptance Criteria

B16.34 - 11-2 Acceptance Standards for Magnetic Particle Examination (MT)

B16.34 - 11-2 Acceptance Standards for Magnetic Particle Examination (MT)

11-2.1 Castings – Maximum acceptable

indications are as follows :

a.Linear indications

(1) 0.3” long for materials up to 0.5” thick.

(2) 0.5” long for material 0.5” to 1.0” thick.

(3) 0.7” long for material over 1.0” thick.

For linear indications, the indications must

be separated by a distance greater than

the length of an acceptable indication. A

linear is one with length in excess of 3 times

the width.

11-2.2 Forgings and Rolled or Wrought

Material – Maximum acceptable indications

are as follows:

a.Linear indications

(1) 0.2” long for materials up to 0.5” thick.

(2) 0.4” long for materials over 0.5” – 1.0”

thick.

(3) .06” long for materials over 1.0” thick.

For linear indications, the indications must be separated by a distance greater than the length of an acceptable indication. A linear indication is one with length in excess of 3 times the width.


Asme b16 34 acceptance criteria1

ASME B16.34 Acceptance Criteria

B16.34 - 11-2 Acceptance Standards for Magnetic Particle Examination (MT)

B16.34 - 11-2 Acceptance Standards for Magnetic Particle Examination (MT)

11-2.1 Castings – Continued

b.Rounded Indications

(1) 0.3” diameter for materials up to

0.5” thick.

(2) 0.5” diameter for materials over 0.5” thick.

Four or more rounded indications in a

line separated by 0.06” or less edge to

edge are unacceptable. Rounded

indications are those that are not

defined as linear indications.

11-2.2 Forgings and Rolled or Wrought

Material – Continued

b.Rounded Indications

(1) 0.2” diameter for materials up to 0.5” thick.

(2) 0.3” diameter for materials over 0.5” thick.

Four or more rounded indications in a line

Separated by a 0.06” or less edge to edge are

Unacceptable. Rounded indications are those

that are not defined as linear indications.


Asme b16 34 acceptance criteria2

ASME B16.34 Acceptance Criteria

B16.34 - 111-2 Acceptance Standards for Liquid Penetrant Examination (PT)

B16.34 - 111-2 Acceptance Standards for Liquid Penetrant Examination (PT)

111-2.1 Castings – Maximum acceptable

indications are as follows:

a.Linear Indications

(1) 0.3” long for materials up to

0.5” thick.

(2) 0.5” long for materials over 0.5” to 1.0” thick.

(3) 0.7” long for materials 1.0” thick.

For linear indications, the indications

must be separated by a distance greater

than the length of an acceptable

indication. A linear indication is one with

length in excess of 3 times the width.

111-2.2 Forgings and Rolled or Wrought

Material - Maximum acceptable indications

are as follows:

a.Linear Indications

(1) 0.2” long for materials up to 0.5” thick or less.

(2) 0.4” long for materials over 0.5” to 1.0” thick.

(3) 0.6” long for materials over 1.0” thick.

For linear indications, the indications must be

separated by a distance greater than the

Length of an acceptable indication. A linear

indications is one with length in excess of 3

times the width.


Asme b16 34 acceptance criteria3

ASME B16.34 Acceptance Criteria

B16.34 - 111-2 Acceptance Standards for Liquid Penetrant Examination (PT)

B16.34 - 111-2 Acceptance Standards for Liquid Penetrant Examination (PT)

111-2.1 Castings – Continued

b.Rounded Indications

(1) 0.3” diameter for materials up to

0.5” thick.

(2) 0.5” diameter for materials over 0.5” thick.

Four or more rounded indications in

line separated by 0.06” or less edge to

edge are unacceptable. Rounded

indications are those that are not

defined as linear indications.

111-2.2 Forgings and Rolled or Wrought

Material - Continued

b.Rounded Indications

(1) 0.2” diameter for materials up to 0.5” thick.

(2) 0.3” diameter for materials over 0.5” thick.

Four or more rounded indications in a line

separated by 0.06” or less edge to edge are

unacceptable. Rounded indications are those

that are not defined as linear indications.


Asme section i repairs

ASME Section I Repairs

  • Repair requirements of a valve are usually confined to the location of the valve in the boiler piping system of the power plant.

  • If the valve to be repaired is located in the piping system which is considered part of the boiler proper or part of the external boiler piping it is declared to be inside the Boiler Code Boundary.

  • Preamble to ASME Section I paragraphs 4, 5 & 7 provide the detailed information defining Code Boundary’s.

  • Repairs to piping and valves within the Code Boundary are repaired using the requirements provided in ASME Section I, National Board Inspection Code (NBIC) and the jurisdiction.


Asme section i repairs1

ASME Section I Repairs

  • To repair Section I Items a Quality Program & NBIC “R” Stamp certification is required.


Section i valve repairs

Section I Valve Repairs

  • CFM/VR-TESCO, LLC performed (21) twenty-one “R” Stamp repairs in 2010-2012.

  • Most of the repairs can be segregated in to 3 groups.

    1.Valves requiring a seat or seats replaced.

    2.Removal and rewelding of integral valve seats.

    3.Repairs of cracks in the valve body or on guide ribs

    or disc guides.

  • Of the (21) twenty-one valves repaired (10) ten valves required replacement of seat rings.


Section i valve repairs1

Section I Valve Repairs

  • All (10) valve bodies were SA217-C12A material.

  • (10) Seats had cracks in partial penetration welds of

    seat to body. Many of these welds had full 360o cracks.

  • (6) Seats had Hardface material missing from the seat face.

  • (1) Valve had 316 SS seats that were cracked 360o and

    were replaced with A182-F91 material seats.

    (4) Valves had seats that were manufactured from

    A355-P22 (P5A) material and they were replaced like for like.


Section i valve repairs2

Section I Valve Repairs

Seat Ring Replacement

  • All seat ring replacements were completed utilizing the following guidelines:

  • Minimum preheat 400oF.

  • Welding process machine GTAW.

  • Wps – 15e mn/gtaw-ht.

  • .035” dia wire – ER90S-B9.

  • Mn & Ni chemistry < 1.0.

  • PWHT @ 1375oF – 2 hours soak time.


Section i valve repairs3

Section I Valve Repairs

  • Thermocouples and ceramic pads on ID seat area.

  • Final NDE (PT) & (VT).


Section i valve repairs4

Section I Valve Repairs

INTEGRAL SEAT REPAIR

  • CFM/VR-Tesco, llc repaired integral seats in

    (11) Eleven valves from 2010 – 2012.

  • Base metal of valve bodies were:

    (2) A217-WC6

    (9) A217-C12A

  • All (11) valves had cracks in the seat area Hardface

    going in to the base metal.


Section i valve repairs5

Section I Valve Repairs

  • (4) Four valves had major cracks in the upper and lower 6oclock rib @ rib to body interface.

  • (10) Ten valves had indications in the Stellite Hardfacing on the guide ribs. This required removal of the Stellite and undercutting of the base metal. The repair required rewelding of the base metal and Hardfacing.


Section i valve repairs6

Section I Valve Repairs

INTEGRAL SEAT REPAIRS

CFM/VR-TESCO, LLC utilized the following guidelines

for Integral Seat Repairs.

1.All defects removed after removal of Stellite hard facing material and approximately .080” of base

metal.

2.NDE (PT) inspection of all repair areas.

3.Sketch and dimensioning of all repair areas.


Section i valve repairs7

Section I Valve Repairs

4.Preheat valve to 400oF minimum.

NOTE: 300oF for P4 material.

5.Weld excavated repair areas and Hardface under

cut areas with Er90S-B9.

NOTE: Er80S-B2 for P4 material.

6.Base metal area profiled and NDE with dry (MT)

on P15E material. Base material is kept at 100oF minimum. No moisture allowed on as welded P15E materials.

NOTE: PT or wet (MT) allowed on all other low alloy materials.


Section i valve repairs8

Section I Valve Repairs

7.Preheat back to 400oF.

NOTE: 300oF for P-4 base materials.

8.Apply a minimum of (2) layers of Stellite 21.

9.Cool valve to below 175oF and visually inspect

the welds.

10.PWHT minimum hold 2 hours @ 1375oF per heat treat traveler.

NOTE: PWHT temp 1250oF for P-4 material.


Section i valve repairs9

Section I Valve Repairs

11. Profile the seat and ribs to OEM specifications.

12. Final NDE, PT to ASME Section 1, VT to ASME B31.1

13. AI review of the weld data package and issuance of R-1 Form and data plate as required.


Asme b31 1 valve repairs

ASME B31.1 Valve Repairs

  • CFM/VR-TESCO, LLC repaired (25) plus valves per ASME B31.1 requirements in 2010-2012.

    The majority of the valves were parallel slide gate

    valves. (22) Valves required seat replacements.

  • ASME B31.1 covers the external boiler piping as defined for power boilers, high temperature, high pressure boilers in which steam or vapor is generated at a pressure of more than 15psig and high temperature water is generated at pressure exceeding 160psig and/or temperature of 250oF.


Asme b31 1 valve repairs1

ASME B31.1 Valve Repairs

  • All welding or brazing of pipes or items shall be performed by manufacturers or contractors who perform repairs holding stamps for symbols shown in Fig. PG-105.1 thru PG-105.3 of ASME Section I of the ASME Boiler and Pressure Vessel Code. (B31.1 Chapter 1 100.1.2).

  • The installer of external boiler piping joined by welding or brazing is required to have a Quality Control system meeting, requirements of Mandatory Appendix J of the ASME B31.1 Code.


Asme b31 1 valve repairs2

ASME B31.1 Valve Repairs

  • For repairs of valves controlled by the requirements of B31.1 the following are required to be documented.

    1. Removal of defect or reduce to acceptable

    size as outlined in Chapter V 127.4.11.

    2. NDE of the defect area by Magnetic

    Particle (MT) or Liquid Penetrant (PT)

    examination. NDE inspection acceptance

    criteria per Chapter V – 136.4.3 for (MT) & 136.4.4 for (PT).


Asme b31 1 valve repairs3

ASME B31.1 Valve Repairs

3. Preheat of the base material as required in Chapter V-131 “Welding Preheat”.

4. Welding shall be performed by use of

PQR’s, WPS’s & WPQ’s as outlined in

Chapter V-127.5.

5. PWHT of the repair as required by Chapter

V-132 “PWHT Requirements”.

6. Final NDE of the repair as required in

Chapter V-136.4 “Examination methods


Asme b31 1 valve repairs4

ASME B31.1 Valve Repairs

6. for Welds & Repairs”. ASME B31.1 Chapter V.

a.Visual Examination (VT) – 136.4.2

b.Magnetic Particle Examination

(MT) – 136.4.3

c.Liquid Penetrant Examination

(PT) – 136.4.4


Asme b31 1 valve repairs5

ASME B31.1 Valve Repairs

All examinations to be performed by

technicians certified to perform each non-

destructive examination per ASME B31.1

Chapter V – 136.3.2 “Qualifications of

NDE personnel”.


Repairs asme section 1 b31 1

REPAIRS – ASME SECTION 1 & B31.1

REPAIRREPAIR

360O CRACKED SEAL WELD 360o CRACKED SEAL WELD

SEAT RING SEAT RING

FIGURE - 1 FIGURE - 2


Repairs asme section 1 b31 11

REPAIRS – ASME SECTION 1 & B31.1

REPAIR REPAIR

SEAL WELDING OF SEAT RING SEAL WELDED SEAT RING

IN GATE VALVE IN GATE VALVE

FIGURE - 3 FIGURE - 4

THERMOCOUPLE PLACEMENT FOR PRE-HEAT


Repairs asme section 1 b31 12

REPAIRS – ASME SECTION 1 & B31.1

REPAIR

6 O’CLOCK GUIDE RIB CRACKING

@ INTREGAL SEAT INTERFACE AND CRACKING 360 DEG. AROUND RIB

FIGURE - 5 FIGURE - 6


Repairs asme section 1 b31 13

REPAIRS – ASME SECTION 1 & B31.1

REPAIR

CRACKING IN INTREGAL SEAT AND GUIDE RIBS IN GLOBE VALVES

FIGURE -7

FIGURE - 8

CRACKS IN INTERGAL SEAT

CRACKS IN INTREGAL SEAT

CRACKS IN GUIDE RIB

CRACKS IN GUIDE RIBS


Repairs asme section 1 b31 14

REPAIRS – ASME SECTION 1 & B31.1

REPAIR

LAMINATION IN GUIDE RIBS

FIGURE - 9

FIGURE - 10

LAMINATION GUIDE RIB PIECES

LAMINATION IN GUIDE RIB


Repairs asme section 1 b31 15

REPAIR

WELDING INTREGAL SEAT

FIGURE - 11

REPAIRS – ASME SECTION 1 & B31.1

GTAW MACHINE WELD OF INTREGAL SEAT


Repairs asme section 1 b31 16

REPAIR

COMPLETED SEAT RING PARTIAL PENETRATION WELD

FIGURE - 12

REPAIRS – ASME SECTION 1 & B31.1


Recipe for success

Recipe for Success

Successful repair of valves and valve components are a

Hallmark of CFM/VR-TESCO, LLC’s years of service. It

Takes a lot more than just welding and machining skills

to repair today’s valve deficiencies.

It starts with gathering all the information available

about the valve to be repaired. All the valve

component information from the OEM when the valve

was 1st purchased.


Recipe for success1

Recipe for Success

The customer must supply the following information to

allow for the completion of work travelers and R-1 data

form if required.

  • Unit Number

  • Boiler Manufacturer

  • Mfg Serial Number

  • National Board Number

  • Jurisdiction Number

  • Year Built


Recipe for success2

Recipe for Success

  • Original Code of Construction

  • System and location of valve being worked

  • Valve Drawing

  • Valve Identification

  • Valve Year of Manufacture


Recipe for success3

Recipe for Success

Once all the pertinent information is gathered QA and

The Welding Department start the planning process:

  • Initiate work traveler and weld data sheets.

  • Identify WPS’s and Welder Performance Qualifications.

  • Create PWHT Traveler.

  • Identify NDE requirements and notify NDE subcontractor.


Recipe for success4

Recipe for Success

  • Issue filler material and supporting documentation MTR/CMTR’s.

  • Notify Authorized Inspector (If required).

  • Present Data Package to Project Manager for review.


Recipe for success5

Recipe for Success

CFM/VR-TESCO, LLC has specialized machining and

Welding equipment that is required to repair the

different types of valve repairs. Equipment is staged

and inspected before shipping to each project.

Personnel training on specialized equipment and valve

repairs.


Recipe for success6

Recipe for Success

The recipe for success may seem simple, but care must

be taken on each step to insure the “best possible”

results for each valve repair.

CFM/VR-TESCO, LLC working with OEM’s and our

Customers have been “Teaming Together for Success”

for over 26 years.


Recipe for success7

Recipe for Success

On behalf of CFM/VR-TESCO, LLC

Thank You Very Much for Your Time !!!


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