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GB/T 10969-2008 PDF in English


GB/T 10969-2008 (GB/T10969-2008, GBT 10969-2008, GBT10969-2008)
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GB/T 10969-2008English919 Add to Cart 4 days Specification for water passage components of hydraulic turbines, storage pumps and pump-turbines Obsolete

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GB/T 10969-2008: PDF in English (GBT 10969-2008)

GB/T 10969-2008
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 27.140
K 55
Replacing GB/T 10969-1996
Specification for Water Passage Components of Hydraulic
Turbines, Storage Pumps and Pump-turbines
ISSUED ON: JUNE 30, 2008
IMPLEMENTED ON: APRIL 1, 2009
Issued by: General Administration for Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Terms, Definitions, Symbols and Units ... 5
3.1 Terms, Definitions and Symbols ... 5
3.2 Unit ... 8
4 Technical Requirements for Geometrical Similarity of Model and Prototype ... 8
4.1 General Provisions... 8
4.2 Check Contents of Geometrical Similarity ... 9
4.3 Evaluation of Uniformity and Geometrical Similarity ... 9
4.4 Dimensional Check Procedures ... 10
4.5 Dimensional Check Methods ... 10
4.6 Multistage Machines, Seals and Thrust Balancing Provisions ... 11
4.7 Dimensional Check Range of Water Passage Components ... 11
4.8 Surface Roughness and Waviness of Water Passage Components ... 28
4.9 Applicability to other Types of Machines ... 30
Specification for Water Passage Components of Hydraulic Turbines,
Storage Pumps and Pump-Turbines
1 Scope
This standard only specifies the control dimension accuracy of water passage components of
hydraulic turbines, storage pumps and pump-turbines that are influential to the hydraulic
performance as well as the surface quality of water passage components in the aspect of the
requirements in prototype hydraulic turbine having geometrical similarity with the model.
This standard is applicable to the model and prototype hydraulic turbines, storage pumps and
pump-turbines meeting one of the following conditions:
a) Whose power is 10MW and the above;
b) Radial flow machines, whose runner nominal diameter is 1.0m and the above;
c) Axial flow, tubular and diagonal machines, whose runner nominal diameter is 3.3m
and the above;
d) Centrifugal storage pumps, whose runner nominal diameter is 1.0m and the above;
e) Impulse turbines, whose runner nominal diameter is 1.0m and the above.
Prototype hydraulic turbines, storage pumps and pump-turbines whose dimension and
capacity are less than the above conditions may refer to this standard.
2 Normative References
The following standards contain provisions which, through reference in this text, constitute
provisions of this standard. For dated reference, subsequent amendments to (excluding
correction to), or revisions of, any of these publications do not apply. However, the parties to
agreements based on this standard are encouraged to investigate the possibility of applying
the most recent editions of the standards. For undated references, the latest edition of the
normative document referred to applies.
GB/T 2900.45 Electrotechnical terminology - Hydroelectric powerplant
machinery (GB/T 2900.45-2006, IEC/TR 61364:1999,
MOD)
GB/T 8564-2003 Specification installation of hydraulic turbine generator units
GB/T 15468-2006 Fundamental technical requirements for hydraulic turbines
Figure 2 -- Definition of waviness and surface roughness
3.1.10
Surface roughness
Surface roughness is the characteristic quality of the surface. Generally speaking, it is
characterized by the arithmetical average tolerance of staggered profiles produced by the
cutting action of tool edges, abrasive grains, feed of the machine, coating and painting or
originally produced by the fabrication (welding) process, as shown in Figure 2.
Symbol: Ra
Unit: μm
3.1.11
Water passage components
As for the types of machines stated in this standard, they refer to the components with main
water flow passing from diversion component inlet to drainage component outlet.
3.2 Unit
The international system of units (SI) and China statutory measurement units have been used
throughout this standard.
4 Technical Requirements for Geometrical Similarity of
Model and Prototype
4.1 General Provisions
A basic requirement for determining prototype performance is to have geometrical similarity
between model and prototype.
Where the dimension tolerance of model meets the requirements of this standard, the
measured average values may be replaced by the theoretical values.
Where the prototype is heterogenic to the model, an agreement shall be reached between the
supplier and the purchaser whether the model efficiency is to be corrected or not through
technology demonstration or individual test.
Water passage surface control dimension of water passage components shall not only meet the
permissible tolerance specified in this standard, but also meet the structural coordination
tolerance and the relevant requirements of GB 8564-2003.
possible to determine if the uniformity requirement has been met. If the uniformity
requirement is not fulfilled, the corresponding components shall be corrected or
remanufactured. In the case where the tolerance between the average value and the theoretical
value is outside the permissible uniformity tolerance, the theoretical values or the geometrical
dimensions of the components shall be corrected. Where spot-checks are performed for the
recurrent components, the individual values may be directly compared with the theoretical
values.
4.3.2 Checking the geometrical similarity between prototype and model
By comparing the corresponding average values of model and prototype and considering the
permissible similarity tolerances as given by this standard, it can be determined whether the
geometrical similarity requirement has been met.
If the geometrical tolerances are greater than the similarity tolerances, further steps shall be
agreed by both parties.
For some dimensions which are difficult to measure on the model and/or prototype, the
average values of model and/or prototype may be replaced by the theoretical values, provided
that the total manufacturing and/or installation permissible tolerances is less than the
permissible similarity tolerance.
4.4 Dimensional Check Procedures
4.4.1 Geometrical similarity check for model and prototype generally starts from the model
to check the geometrical similarity of prototype. Where the model is manufactured according
to the existing prototype, the check starting point shall be the prototype.
4.4.2 Geometrical similarity check is composed of single check and post-assembly check.
As for the single check, the similarity of single component shall be checked. As for the
post-assembly check, the similarity of the entire machine shall be checked. The runner axis
and/or guide vane center line is usually used as the reference value for the relevant physical
dimension of component assembly. Water passage formed by the transition between adjacent
component, fixing and rotating parts shall be paid special attention to during the check.
Relevant permissible tolerances are not specified in this standard.
4.5 Dimensional Check Methods
To measure the shape (axial surface) of runner/impeller blades, guide vanes and stay vanes,
several methods are suitable, including three dimensional co-ordinate measuring systems,
optical measuring systems, templates, etc. Corresponding check for the blade shapes and
geometrical positions of runner/impeller may be used for determining the blade setting angle.
Using three dimensional co-ordinate measuring systems or optical measuring systems,
measurement can be made either by measuring points moving along curves or by measuring
points on the surface. Where comparing the theoretical curve and the measuring results, the
reference points may be adjusted so that the total measuring error is minimized.
Considering the manufacturing process of the runner/impeller, the supplier shall propose the
most appropriate measuring method in agreement with the purchaser to demonstrate the
geometrical similarity between prototype and model.
Figures 4 to 16 give examples showing schematically the location and extent of the
dimensional check.
In some cases it is not possible to measure the relevant dimension directly (e.g. if a junction is
covered by a round angle), the measurement shall be made in an agreed location.
In order to protect the confidentiality of the supplier's hydraulic design, the supplier need only
submit the differences between the measured and the theoretical profile and not the actual
values of the co-ordinates of the profile. For checking purposes, the absolute values and
measured tolerances of inlet and outlet edge profiles may be provided by the supplier.
4.6 Multistage Machines, Seals and Thrust Balancing Provisions
4.6.1 Multistage machines
Normally the model test should be performed with the same number of stages as the
prototype.
For a prototype with four or more stages, in exceptional cases, the model may be tested with a
reduced number of stages (for instance a three-stage model test for a four-stage prototype).
4.6.2 Seals and thrust balancing provisions
For mechanical reasons, it may not be possible or desirable (especially for large scale ratios)
for the shaft diameter, runner clearances and the thrust balancing provision to be either
geometrically similar or hydraulically equivalent between the model and the prototype. In
such cases, seal leakage losses and thrust coefficient will differ between model and prototype.
The differences shall either be negligible or be accurately estimated so that the hydraulic
efficiency or the thrust of the prototype can be computed.
4.7 Dimensional Check Range of Water Passage Components
4.7.1 Reaction turbines
4.7.1.1 Main components
a) The principal dimensions of the spiral case (or diversion part in the case of a tubular
turbine), the stay ring, the distributor, the draft tube, and if necessary the space
between runner and head cover (see Figure 4, Figure 5, Figure 7 and Figure 8);
b) The principal dimensions of the runner including inlet and outlet diameters, inlet
height, upper canopy and lower ring profile, and hub in case of axial flow and tubular
turbine runner (see Figure 6 and Figure 9);
4.7.3 Storage pumps and pump-turbines
4.7.3.1 Main components
a) The principal dimensions of the spiral case, diffuser, suction pipe and if necessary the
space between runner/impeller and head cover (see Figure 4, Figure 5, Figure 7 and
Figure 8);
b) The principal dimensions of the runner/impeller including inlet and outlet diameters,
outlet height, and lower ring and upper canopy of runner/impeller (see Figure 9 and
Figure 12);
c) The number of runner/impeller blades, diffuser vanes/guide vanes and stay vanes;
d) The shape of the runner/impeller water passages, and shape of diffuser vanes/guide
vanes and stay vanes (including the maximum thickness of stay vanes, diffuser vanes
and runner/impeller blades);
e) Dimensions related to the sealing ring or end clearance of runner blade and end
clearances of guide vanes (if any).
4.7.3.2 Centrifugal and radial flow runner/impeller
The requirements for centrifugal and radial flow runners/impellers are, for convenience,
expressed in terms of a single-flow single-stage machine. For double-flow and multi-stage
machines, additional measurements shall be taken of all inlets and stages.
a) Blade inlet profiles shall be measured at least at three sections. The length shall extend
from the end of the blade to a distance of (0.1~0.15)1) D2 along the pressure side and
suction side of the blade (see Figure 11);
b) The blade inlet angles shall be checked at the same sections as for inlet profile, and
check template length shall not be less than (0.1~0.15)1) D2 (See Figure 11);
c) Blade outlet profiles shall be checked at least at two sections for low specific speed
runners/impellers and at three sections for high specific speed runners/impellers. The
length shall extend from the end of the blade to a distance of (0.1~0.15)1) D2 along the
pressure side and suction side of the blade (see Figure 10 and Figure 11);
d) The blade outlet angles shall be checked at the same sections as for outlet profile, and
check template length shall not be less than (0.1~0.15)1) D2;
e) Entire blade profile (from inlet edge to outlet edge) shall be measured at least for one
section, if possible, depending on the specific speed or randomly on the whole surface
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.