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JB/T 56078-1996

Chinese Standard: 'JB/T 56078-1996'
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Detail Information of JB/T 56078-1996; JB/T56078-1996; JBT 56078-1996; JBT56078-1996
Description (Translated English): (Large turbine product quality grading)
Sector / Industry: Mechanical & Machinery Industry Standard (Recommended)
Classification of Chinese Standard: K55
Word Count Estimation: 12,000
Date of Issue: 3/9/1996
Date of Implementation: 1/1/1997
Older Standard (superseded by this standard): JB/DQ 1230-87

JB/T 56078-1996
JB
MACHINERY INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
Replacing JB/DQ 1230-87
Large Hydraulic Turbine - Grading of Product Quality
大型水轮机 产品质量分等
APPROVED ON. SEPTEMBER 3, 1996
IMPLEMENTED ON. JANUARY 1, 1997
Approved by. Ministry of Machinery Industry
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Principle... 5 
4 Product quality grading ... 6 
5 Determination method ... 9 
Foreword
This Standard was drafted on the basis of “Large Hydraulic Turbine - Grading
of Product Quality” issued by former Electrical Bureau of National Machinery
Industry Committee in 1987, and has become an industrial standard (for internal
use). Four references of this Standard have been upgraded as national
standards. Therefore, the level of this Standard is higher than the previous
edition.
Compared with the previous edition, the main technical changes are as follows.
Column 6 “Cavitation guarantee” in Table 1 is modified to “Cavitation erosion
guarantee”. The “1” in column “Qualified product” is modified to “Cavitation
erosion guarantee” period shall comply with requirements in “Cavitation pitting
evaluation in reaction hydraulic turbine”; The “2” modified to “Cavitation damage
amount” shall comply with the requirements in “Cavitation pitting evaluation in
reaction hydraulic turbine”. The “2” in column “First-class product” is modified
to “Cavitation damage amount” shall comply with 4/5 of the requirements in
“Cavitation pitting evaluation in reaction hydraulic turbine”. The “2” in column
“Excellence product” is modified to “Cavitation damage amount” shall comply
with 3/4 of the requirements in “Cavitation pitting evaluation in reaction
hydraulic turbine”. It is used to determine the extent of anti-cavitation of
hydraulic turbine.
In Table 4, “mixed-flow and axial-flow blade profile checking” is modified to
“mixed-flow and axial-flow blade profile shall be checked by blade’s front and
back combination sample-plate or blade’s front combination sample-plate. The
back shall be checked in the method that is used for blade thickness
measurement or single sample-plate. For the column “its gap or design value’s
difference”, qualified product is modified to 0.15%D1, first-class product is
modified to 0.12%D1, and excellent product is modified to 0.1%D1, so as to ease
the manufacturing workload of combination sample-plate and ensure the
accuracy of blade shape.
This Standard is a grading standard for large hydraulic turbine quality that is
derived from GB 15468-95 “Fundamental Technical requirements for hydraulic
turbine”.
Since the implementation of this Standard, this Standard replaces JB/DQ 1230-
87.
This Standard was proposed by and shall be under the jurisdiction of Harbin
Institute of Large Machinery Research.
Large Hydraulic turbine - Grading of Product Quality
1 Scope
This Standard is applicable to the mixed-flow hydraulic turbine, ramp-flow
hydraulic turbine, axial-flow hydraulic turbine (tubular hydraulic turbine refers to
axial-flow) and scoop hydraulic turbine of which the power exceeds 10 MW; the
butterfly valve of which the nominal diameter is 1000~8000 mm; and the rotary
valve of which the nominal diameter is 500~2400 mm.
2 Normative references
The following standards contain the provisions which, through reference in this
Standard, constitute the provisions of this Standard. At the time of publication,
all editions indicated were valid. All standards are subject to revision, and
parties to agreements based on this Standard are encouraged to investigate
the possibility of applying the most recent editions of the standards indicated
below.
GB/T 14478-95 Basic technical conditions of large hydraulic turbine inlet
valve
GB/T 15468-95 Fundamental technical requirements for hydraulic turbine
GB/T 15469-95 Cavitation pitting evaluation in reaction hydraulic turbine
GB/T 15613-95 Specification for acceptance test of hydraulic turbine model
GB/T 10969-1996 Specifications for water passage components of hydraulic
turbine
JB 1270-93 Hydro turbine shaft forging technical conditions
JB/DQ 1222-87 Hydroelectric generating set packaging, transportation,
storage and technical conditions
3 Principle
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 Product quality grading
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
products for supporting member must meet requirements for first-class
products.
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 qual......
Related standard:   JB/T 12708-2016  JB/T 10484-2004
   
 
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