mtoe.ings.it.0002.01-en inspection blades

7/30/2019 MTOE.ings.IT.0002.01-En Inspection Blades

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W ORK I NSTRUCTI ON MTOE.INGS.IT.0002.01-EN

Wind O&M Wind Energy Maintenance

Dates and Signatures

Th i s docum en t has been app rov ed by the s ame pe r s ons as the s pan i s h one

FE08_PE0805 Rev01 Page: 1 of 15

INSPECTION OF THE BLADES FROM THE GROUND USINGCAMERA AND TELESCOPIC LENS


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1. OBJECTIVE 22. SCOPE 23. SAFETY AND THE ENVIRONMENT 24. DESCRIPTION 2

4.1. ASSIGNMENT OF CODES TO MOST USUAL DAMAGE TO BLADES. 24.2. OPERATING MODE FOR THE INSPECTION OF BLADES USING CAMERA AND

TELESCOPIC LENS. 105. ATTACHMENTS 12

5.1. ATTACHMENT 1: ORGANIZATION OF THE BLADE INSPECTION FOLDERS. 125.2. ATTACHMENT 2: EXAMPLE OF COMPLETED CHECK LIST 135.3. ATTACHMENT 3: SUMMARY LIST OF DAMAGE CODES 14

1 .OBJECTI VE

This document defines and assigns codes to the different types of damage which may generally befound on the blades. The objective in assigning codes to the different types of damage is to simplifythe collection of data on the check list for the inspection of blades using a camera and telescopic lens.The steps to be followed during the inspection and the procedure for completing the check list are alsoexplained in this document.

2 .SCOPE

This document is applicable to all wind farms on which the blade maintenance is carried out byAcciona Energia except for NEG MICON wind turbines with TIP blades from LM.

3 .SAFETY AND THE ENVI RONMENT

Safety: The measures indicated in the safety sheet, FS-01, must be taken. The environment: The regulations established in the document, Environmental Standards for wind

farm maintenance (IE06_PG0804), shall be observed

4 .DESCRI PTI ON

4.1 .ASSI GNMENT OF CODES TO MOST USUAL D AMA GE TO BLAD ES.

4 .1 .1 .DAMA GE ON LEADI NG EDGE

1 .1 -Crack on l ead ing edge

These are cracks which form just below the adhesive joint of the two shells on the leading edge


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1 .2 -Lead ing edge b roken

Knocks during assembly or as result of bird impact cause the fibers of the leading edge to breakand may result in a hole.

1 .3 -P i t t i ng on l ead ing edge

These are pits which form along the line of the overlap between the edging cloth and the shellcloth. Generally, any spots along the line of the cloth overlap may be considered as pitting.

1 .4 -Eros ion on l ead ing edge

Erosion on the leading edge is observed as soon as the gel coat disappears and the yellow-browncoat of primer is visible on the surface.


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1 .5 -Severe e ros ion on l ead ing edge

The erosion can be considered serious when the leading edge cloth can be seen. This means thatthe erosion has removed the gel coat and the primer coat.

1 . 6 - Sp a l li n g f r o m p i t t i n g

When pitting is observed on a blade, the coat often beings to flake from the overlap line betweenthe edging cloth and the shell cloth.

4 .1 .2 .DAMA GE ON TRAI LI NG EDGE

2 .1 -Crack on t ra i l i ng edge

These include all the cracks affecting the trailing edge cloths. These are usually developedperpendicular to the trailing edge.


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2 .2 -T ra i l i ng edge de tached

This is a fault in the adhesion of the two shells on the trailing edge. A gap is visible between thetwo shells on the trailing edge.

2 .3 -T ra i l i ng edge b rok en

This damage usually occurs when the blade is being handled. The cloths may be broken or apiece of the trailing edge is missing.

2 .4 -Eros ion on t ra i l i ng edge

This damage is found in the blade pressure shell and is caused by air friction. The yellow-browncoat of primer is usually visible on the surface.


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2 . 5 - Pi t t i n g o n t r a i l in g e d g e

These are pits in the gel coat along the overlap lines of the cloths on the trailing edge.

4 .1 .3 .DAMA GE I N SHELL

3 . 1 - Sp a l li n g < 2 0 0 x 2 0 0 m m

These are poorly attached areas of gel coat 2 0 0 x 2 0 0 m m

These are poorly attached areas of gel coat >200 x 200 mm which have flaked to reveal thelaminate.

3 . 3 - Cr a c k w i t h d a m a g e d c l o t h s

These are the cracks appearing on the cloths on the shells.

3 .4 -Cracks on the beam -she l l j o i n t


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These are the cracks which appear along the beam or the struts on the cloths on the shellsurface. These cracks are characterized by following the attachment line of the beam. Thesecracks are often perpendicular to the trailing edge and gradually spread over time (T- or Y-cracks).

4 .1 .4 .DAMA GE TO TI P

4 .1 -Cracks on baby j o i n t

These are cracks which appear on the tip just below the point where the beam joins theextension (the baby). These cracks may be a sign of weakness in the beam-baby joint or theymay be the result of poor repairs to the tip.

4 .2 -Open t i p

These are tips with faults in the attachment of the two shells. Usually a gap is clearly visible

between the two shells.


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4 . 3 - Li g h t n i n g s t r i k e w i t h o u t d a m a g i n g cl o t h s

Black marks can usually be seen next to the lightning rod as a result of the lightning strike.

4 . 4 - Li g h t n i n g s t r i k e w i t h d a m a g e d cl o t h s

This refers to damage to the cloths at the tip as a result of lightning strikes. Black marks areusually visible around the broken cloths.

4 . 5 - 3 M t a p e d e t a ch e d o r d a m a g e d

Generally, when a 3M tape is detached or damaged, black dirt marks are visible as a result ofthe irregularity caused by the defect. Air bubbles, detached or torn pieces, knocks from the

cutter during unpacking may be encountered.

4 .1 .5 .DAMAGE TO ROOT

5 .1 -Crack on r oo t on l ead ing edge

Cracks that start at the root of the blade on the leading edge side.


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5 .2 -Crack on roo t on t ra i l i ng edge

Cracks that start between the root and the apex of the blade on the leading edge side.

5 .3 -Rus t o r c racks on ex tender

These are defects which can be found in the extender zone. These include rust, pits, poor sealsat the joint and cracks.

4 .1 .6 .DA MA GE TO THE GEL COAT

6.1-Grease s ta ins

These are stains caused by traces of grease from the pitch system or from the blade bearing.

6 . 2 - Ot h e r t y p e s o f d i r t


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Stains caused due to air, dust, insect or particle contamination.

6 . 3 - Co a t d a m a g e d o r w o r n

These are areas in which the gel coat is observed to be incorrectly attached, with blisters orlarge stains due to poor gel coat mixture.

6 .4 -Cracks on coa t o r cu t s f rom cu t t e r

These are surface cracks resulting from knocks by the cutter or due to the application of thecoat too thickly. These cracks do not damage the fiber as they only superficial.

4 .2 .OPERATI NG MODE FOR THE I NSPECTI ON OF BLADES USI NG CAM ERA AN D

TELESCOPI C LENS.

4 .2 .1 .POSI TI ON OF BLADE

The blade is placed vertically to permit the inspection of the two shells, moving the tripod andcamera from one side of the blade to the other.

The three blades of the wind turbine should be feathered. The wind turbine should be in PAUSEmode and the emergency button pressed to lock the rotor in the required position. Before stoppingthe turbine, notify Remote Control of the expected times for stopping and starting the turbine.

The orientation of the turbine is defined by the position of the sun in order to ensure good lightwhen taking photos.

4 .2 .2 .DATA COLLECTI ON ( SEE ATTACHMENT 2 )

Step 1 : Complete the table on page 1 with the following data:

Work order number

Subcontractor number

Name of operators performing the inspection


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Name of wind farm

Date of inspection

Model of blade (Manufacturer and length)

Serial number of blade 1



Step 1 : Position the first blade in accordance with 4.2.1

Step 2 : Set up the camera and tripod

Step 3 : For each damage found, complete the table in the check list with the followinginformation:

Distance of damage to the leading edge in centimeters.

Approximate radius point of damage. In the event of cracks and large spalling, note theradius at the start and the end of the damage.

Size in centimeters of the damage.

Damage code according to 4.1 Assignment of codes to most usual types of damage onblades.

Step 4 : Move the numbered circles corresponding to each damage type across the diagram ofthe blade to establish the approximate position. If the damage is repeated in several areas ofthe blade, copy the corresponding numbered circle and place it on the blade diagram.

Step 5 : In the last column of the table, set up a link to the photos corresponding to eachdamage. The photos and the check list are placed in the same folder in accordance with theorganization defined in Attachment 1.

Step 6 : Inspect the next blade


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5 .ATTACHMENTS

5.1 .ATTACHMENT 1: ORGANI ZATI ON OF THE BLADE I NSPECTI ON FOLDERS.

Alaitz Wind Farm

A.E A3.7

Photos Blade 1

Photos Blade 2

Photos Blade 3

Check List A.E A3.7

A.E A3.8

A.E A3.9

Etc.

Moncayuelo Wind Farm


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5 .2 .ATTACHMENT 2 : EXAM PLE OF COMPLETED CHECK LI ST

Data capture

NO= DAMAGEDI STANCE

FROM LE ( CM)RADI US

SI ZE OFDAMAGE

(CM)

DAMAGECODE

COMMENTSLI NKS TOPHOTOS

1 30 19000 15 3.3Cracks with

damaged cloths1 .2 .3 .

2 - 23000 30 4.2

Open tip on

trailing edge 1 .2 .3 .

3- 4000 40 5.1

Crack on leadingedge, root area

1 .2 .3 .

4 -

From14000

to23000

900 1.4Mild erosion onleading edge

1 .2 .3 .

5

6

7

8

I -BLADE I

Pressure Valve

Position of damage

Suction Valve


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5 .3 .ATTACHMENT 3: SUMMA RY LI ST OF DAM AGE CODES

D a m a g e

codes Desc r i p t i on o f dam age

Lead ing edg e

1 .1 Crack on l ead ing edge

1 .2 Lead ing edge b rok en

1 .3 P it t i ng on l ead ing edge

1 .4 Lead ing edge e ros ion

1 .5 Severe e ros ion on l ead ing edge

1 . 6 Sp a l li n g f r o m p i t t i n g

Tra i l ing edg e

2 .1 Crack on t r a i l i ng edge

2 .2 T ra i l ing edge de tached

2 .3 T ra i l ing edge b rok en

2 .4 Eros ion on t r a i l i ng edge

2 . 5 Pi t t i n g o n t r a i l i n g e d g e

Shel ls

3 . 1 Sp a l li n g < 2 0 0 x 2 0 0 m m ( g e l c o at d e t a ch e d )

3 . 2 Sp a l li n g > 2 0 0 x 2 0 0 m m ( g e l c oa t d e t a ch e d )

3 .3 Cracks w i th dam aged c lo ths

3 .4 Cracks on th e beam -she l l j o i n t

Tip

4 .1 Cracks on baby j o i n t

4 .2 Open t i p

4 . 3 L ig h t n i n g s t r i k e w i t h o u t d a m a g i n g c lo t h s

4 . 4 L ig h t n i n g s t r i k e w i t h d a m a g e t o c lo t h s

4 . 5 3 M t a p e d e t a ch e d o r d a m a g e d

Root

5 .1 Crack on roo t on l ead ing edge

5 .2 Crack on roo t on t r a i l i ng edge

5 .3 Rus t o r c racks on ex tend er

Gel coat

6 .1 Grease s ta ins

6 . 2 Ot h e r t y p e s o f d i r t

6 . 3 Co a t d a m a g e d o r w o r n

6 .4 Cracks on coa t o r cu ts f rom cu t t e r


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Record o f changes

Rev. Date Descr ip t ion

01 2007/01/03 Drafting of Work Instruction

02 ----/--/--

03 ----/--/--

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