JB/T 56078-1996Large hydraulic turbines - Product quality grading (English PDF)

3.1

This Standard is used as a reference for corporation’s product quality assessment, product classification and grading, state overall-inspection and product quality supervision.

3.2

Since machine assembly and comprehensive test of hydraulic turbine product cannot be conducted in manufacturing plant, the comprehensive assessment on product performance, including product installation quality, shall be determined after being operated for a period of time by power plant.

4.1 Qualified product

4.1.1 Performance and structure

Product performance shall meet current standard requirements through design review and product identification.

4.1.2 Operating performance

Product’s main performances shall meet the guidelines of stipulated qualified products in Table 1 and Table 2. Other performances shall comply with provisions in relevant technical standards and technical conditions.

4.1.3 Reliability and lifetime

In compliance with the relevant provisions of the user installation, use and maintenance conditions, the product’s forced outage rate, overhaul interval period, life expectancy shall meet the guideline of qualified products specified in Table 1.

4.1.4 Complete set

4.1.4.1

Auxiliary products including speed governor, automation components and products for supporting member must meet the requirements for qualified products.

4.1.4.2

Accompanying spare parts shall be interchangeable with the product.

Spare parts, special tools and accompanying documents shall be complete.

4.1.5 Packaging

Product packaging, transport and storage must comply with the provisions in

JB/DQ 1222.

4.1.6 Parts processing and assembly quality

Hydraulic turbine wheel’s blade profile and surface roughness shall meet the guidelines for qualified products specified in Table 3 and Table 4. Examination- items’ pass-rate of main components shall not be less than 85% of examination- items specified in Table 5. In which, for unqualified items, it is allowed to reuse […]

4.2.5 Parts processing and assembly quality

Hydraulic turbine wheel’s blade profile and surface roughness shall meet the guidelines for first-class products specified in Table 3 and Table 4. Examination- items’ pass-rate of main components shall not be less than 90% of examination- items specified in Table 5. In which, for unqualified items, it is allowed to reuse under the condition that they do not affect the product performance and safe use AND after taking certain measures and approval procedures. However, all key items must be all qualified.

4.2.6 User reviews and customer service

Product shall have good effect by user reviews, timely customer service and good competitiveness in domestic market.

4.3 Excellent product

In addition to requirements for first-class products, it shall meet the following requirements.

4.3.1 Performance and structure

Products must have good performance and advanced structure after being examined and determined through new technology, new principle, the use of new materials, economy, technique of product structure, standardization degree and human-machine relation, i.e., they shall be equivalent to contemporary international advanced level of similar products.

4.3.2 Operating performance

Product main performance shall meet the guideline requirements for excellent products specified in Table 1 and Table 2. Other performances shall comply with the provisions of relevant technical standards and product technical conditions.

4.3.3 Reliability and lifetime

In compliance with the relevant provisions of the user installation, use and maintenance conditions, the product’s forced outage rate, overhaul interval period, life expectancy shall meet the guideline of excellent products specified in Table 1.

4.3.4 Complete set

Auxiliary products including speed governor, automation components and products for supporting member must meet requirements for excellent products.

4.3.5 Parts processing and assembly quality

Hydraulic turbine wheel’s blade profile and surface roughness shall meet the guidelines for first-class products specified in Table 3 and Table 4. Examination- items’ pass-rate of main components shall not be less than 95% of examination items specified in Table 5. In which, for unqualified items, it is allowed to reuse under the condition that they do not affect the product performance and safe use AND after taking certain measures and approval procedures. However, all key items must be all qualified.

4.3.6 User reviews and customer service

Product shall have good quality by user reviews, international advanced level of similar products, and good competitiveness in international market.