GB/T 33540.1-2017Lubricants for wind turbine—Part 1: Bearing grease (English PDF)

5.1.2 Exit-factory periodic inspection items

When the raw materials and production process do not have any changes that may affect the product quality.

The exit-factory periodic inspection items of wind turbine generator main shaft yaw variable pitch bearing grease include. cone penetration (extension work cone penetration), oil separation, roller stability, oxidization stability, and low temperature torque shall be inspected at least once every year.

The exit-factory periodic inspection items of wind turbine generator bearing grease include. cone penetration (extension work cone penetration), roller stability, oxidization stability, and low temperature torque shall be inspected at least once every year.

5.1.3 Type inspection

Type inspection items are all inspection items as specified in Chapter 4 "Technical requirements". The type inspection is carried out in the following cases.

a) In case of new product putting into production or product finalization authentication;

b) In case of major changes of raw materials, processes and so on that may affect the product quality;

c) In case of major difference between the exit-factory inspection results and the last type inspection results.

5.2 Batching

Under the conditions that the raw material and process are not changed, each can or kettle of products is deemed as a group (batch).

5.3 Sampling

CONDUCT sampling in accordance with SH/T 0229, AND the sampling volume shall comply with the volume requirements for the samples for exit-factory inspection or type inspection and reservation.

5.4 Judgment

If the exit-factory inspection and type inspection results of the wind turbine generator main shaft yaw variable pitch bearing grease comply with the technical requirements of Table 1 in Chapter 4, this batch of products shall be judged as qualified.

If the exit-factory inspection and type inspection results of the wind turbine generator bearing grease comply with the technical requirements of Table 2 in Chapter 4, this batch of products shall be judged as qualified.

5.5 Re-inspection rules

If there is an item of exit-factory inspection and type inspection failing to comply with the technical requirements of Chapter 4, FOLLOW the requirements of SH/T 0229 to re-take double number of samples for the purposes of re-inspection. If the re-inspection results still fail to comply with the technical requirements in Chapter 4, this batch of products will be deemed as disqualified.