WIND TURBINE BLADE REPAIR IN GIA LAI BY MBWIND
In October 2021, MBWIND’s after-sales on-site personnel reported that 2 TMT78.0C blade reverse bolts of Gia Lai – Song An Wind Farm in Vietnam were stuck, the length of the bolt is 480 mm, after the bolt is stuck, cut along the flange face to remove the overhang, and the stuck part needs to be dealt with.
Materials and tools
List of main materials
| NO. | Material coding | Item Description | Unit | Amount | Supplier |
| 1 | TX5F3207-40002 | Blade root connecting bolt M36*560 | EA | 1 | SONG AN |
| 2 | W300006936 | Flat washer | EA | 1 | SONG AN |
| 3 | W300004304 | Hex nuts | EA | 1 | SONG AN |
| 4 | W800001480 | EPDM O-ring (26.5*5) | EA | 1 | SONG AN |
| 5 | W800007408 | Thread Fastener 277 (250ml/piece) | BOT | 1 | SONG AN |
| 6 | – | Molybdenum disulfide lubricant | BOT | 1 | SONG AN |
Table 1. Main material
Equipment List
- The equipment/tools required for this blade repair are shown in Table 2:
| NO. | Item Description | Unit | Amount | Supplier |
| 1 | Magnetic drill | EA | 1 | SONG AN |
| 2 | Magnetic drill tooling | EA | 1 | SONG AN |
| 3 | Alloy taper shank twist drill (Φ32*560, reverse drill) | EA | 1 | SONG AN |
| 4 | Alloy taper shank twist drill (Φ36*500, reverse drill) | EA | 1 | SONG AN |
| 5 | Hollow socket | EA | 1 | SONG AN |
| 1 | M36 tap (6H, pitch 4 mm) | EA | 1 | MBWIND |
| 2 | M36 Tension | EA | 1 | MBWIND |
| 3 | Tension pump | EA | 1 | MBWIND |
| 4 | Hydraulic hose 200mPA | EA | 1 | MBWIND |
| 5 | Hydraulic wrench (machine TORQUE) | EA | 1 | MBWIND |
| 6 | 3 phase generator 30-50KVA | EA | 1 | MBWIND |
| 7 | Vacuum cleaner | EA | 1 | MBWIND |
| 8 | Dust blower | EA | 1 | MBWIND |
| 10 | Socket | EA | 2 | MBWIND |
| 11 | Welding machine | EA | 1 | MBWIND |
| 12 | Cutting machines | EA | 1 | MBWIND |
| 13 | Drill Machine Hand | EA | 1 | MBWIND |
| 14 | Grinder machine makita | EA | 1 | MBWIND |
| 15 | walkie talkie | EA | 4 | MBWIND |
Table 2. Equipment /Tools equipped
--> Read more: Wind Turbine Nacelle & Hub Repair Service in Vietnam
Replacement plan
Steps to remove broken bolts on turbine blade
- Connect the generator and connect the electricity to the turbine.
- Rotate blade with broken bults facing down.
- Remove Cover so that the worker can move inside the HUB.
- Pull the repair tools upwards with a winch or lift.
- Rotate Pitch Blade part so that the broken bolt is exposed.
- Install the Φ 36 twist drill (requires a reverse drill), adjust the position of the magnetic drill, lower the drill bit to the bolt cut-off position, lower the drill bit to the bolt cut-off position, just in contact with the cut surface of the bolt, make sure there is no interference between the drill bit and the inner wall of the pitch bearing, and use a marker to draw the position where the drill bit is flush with the inspection plane a marked line, and draw another marking line at a position 110mm away from this marking line (the drill bit reaches the starting point of the bolt sleeve thread).
- After adjusting magnetic drill the position and confirming that there is no interference between the drill bit and the inner wall of the bearing, attach the magnetic drill to the tool and confirm that the drill and the tool are firmly fixed or not.
- Start the magnetic drill and turn it counterclockwise and slowly lower the drill bit to the bolt cutting position until it contacts the bolt, If the magnetic drill or tooling shake occurs during the following cutting process, the magnetic drill should be turned off immediately to avoid the drill bit breaking or damage to the pitch bearing, check and confirm the reason, and then continue after adjustment, the speed of lowering the knife is slow.
- If the bolt does not come out, use a drill bit 18 to drill into the center of the bolt, , then use M20 tap ( reverse M20 tap ). Drill clockwise to remove broken bolt.
- Use a rod with a magnet to attract iron filings after drilling.
- Then use the Tension pump to install new bolts and nuts. Use tightening force according to technical requirements
Steps to tapped valve drill thread hole for blade.
- Connect the generator and connect the electricity to the turbine.
- Rotate blade with broken bults facing down.
- Remove Cover so that the worker can move inside the HUB.
- Pull the repair tools upwards with a winch or lift.
- Rotate the Pitch Blade to expose the damaged thread hole.
- To rerun the damaged threaded hole, run to the end of the threaded hole.
- Use a rod with a magnet to attract iron filings after tapped valve drill
- Then use the Tension pump to install bolts and nuts. Use tightening force according to technical requirement.
Other instructions
- According to the actual situation of the site during maintenance, our company has the right to adjust the plan according to the actual situation.
- The parameters in the scheme are estimated based on the existing information, and need to be reconfirmed according to the length of the reversed bolt, the extension length, and the actual thickness of the flange.
--> Read more: Wind Turbine Repair Service in Vietnam
Some actual pictures of the repair process of wind turbine blades in Gia Lai, Vietnam
6 Reasons to Choose MBWIND for Wind Turbine Inspection & Maintenance Services in Vietnam
- MBWIND offers drones for wind turbine inspection and surface damage detection accurately and cost-effectively.
- After inspection, MBWIND’s professional expert team constantly evaluates and provides repair advice to customers.
- MBWIND provides a quality wind turbine repair service that quickly troubleshoots and maintains the turbine’s operation at the highest capacity.
- MBWIND offer a substantial discount policy for customers who use wind turbine surface inspection and repair services such as wind blades, nacelle covers and rotor hub.
- MBWIND is one of the most reputable addresses for wind turbine maintenance and repair services in Vietnam with iso certificates, and other quality certifications.
- Customer care staff, engineers, and experts are friendly, meticulous, safe and thoughtful.
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