GB/T 43683.1-2024 Guidance for installation procedures and tolerances of hydroelectric machines - Part 1: General aspects
1 Scope
The document is to establish, in a general way, suitable procedures and tolerances for the installation of hydroelectric turbines and generators. This document presents a typical assembly. There are many possible ways to assemble a unit. The size of the machines, design of the machines, layout of the powerhouse and delivery schedule of the components are some of the elements that could result in additional steps, the elimination of some steps and/or assembly sequences.
It is understood that a publication of this type will be binding only if, and to the extent that, both contracting parties have agreed upon it.
Installations for refurbishment projects or for small hydro projects are not in the scope of this document. An agreement between all parties is necessary.
This document excludes matters of purely commercial interest, except those inextricably bound up with the conduct of installation.
The tolerances in this document have been established upon best practices and experience, although it is recognized that other standards specify different tolerances.
Wherever this document specifies that documents, drawings or information is supplied by a manufacturer (or manufacturers), each individual manufacturer will furnish the appropriate information for their own supply only.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
No terms and definitions are listed in this document.
4 Concept
4.1 General
For vertical units, reference axes are defined in relation to upstream, looking at the unit from the generator end (see Figure 1). Upstream corresponds to the Y+ axis, 0° and 12 h 00. The angles increase in the clockwise direction; therefore, the X+ axis corresponds to 90°, the right hand side and 3 h 00.
For horizontal units, upstream is replaced by vertical up and downstream replaced by vertical down.
Figure 1 Axes definition for vertical units
4.2 Reference centre
The reference centre is the best centre of the designated (or specific) component that all other components should be aligned to.
4.3 Best centre
The best centre of a circular shape component corresponds to the point for which the circularity has the minimal deviation. Its location is calculated from a set of radii at equal angles and measured from the reference centre.
Determination: The components x and y of the best centre from the reference centre can be calculated with the following two formulae, where 0° is located upstream and the angle increases clockwise:
where
n——is the number of readings;
Ri——is the measured radius;
θi——is the angular position of each measurement.
Table 1 shows a sample calculation.
Table 1 Sample calculation
The explanation of how to calculate the best centre is given below (see Figure 2):
Thus the best centre of the component is located 0,11 units upstream (Y+) and 0,33 units
to the left (X−) of the reference centre. Calculated radii based on the Best Centre as the
new reference can be calculated in order to calculate circularity.
Figure 2 Best centre sample calculation
4.4 Concentricity
The concentricity is the radial distance, d, from the reference centre to the best centre of
The component (see Figure 3).
Figure 3 Concentricity
4.5 Circularity
Circularity is the difference between the maximum and minimum radii, measured from the
component best centre (see Figure 4).
Figure 4 Circularity
4.6 Reference horizontal plane
The reference horizontal plane is a horizontal plane located at the average elevation of a feature on the component that the other component should be aligned to.
4.7 Reference vertical plane
The reference vertical plane is a vertical plane located at the average distance of a feature on the component that the other component should be aligned to.
Standard
GB/T 43683.1-2024 Guidance for installation procedures and tolerances of hydroelectric machines—Part 1：General aspects (English Version)
Standard No.
GB/T 43683.1-2024
Status
valid
Language
English
File Format
PDF
Word Count
12500 words
Price(USD)
375.0
Implemented on
2025-4-1
Delivery
via email in 1~3 business day
Detail of GB/T 43683.1-2024
Standard No.
GB/T 43683.1-2024
English Name
Guidance for installation procedures and tolerances of hydroelectric machines—Part 1：General aspects
GB/T 43683.1-2024 Guidance for installation procedures and tolerances of hydroelectric machines - Part 1: General aspects
1 Scope
The document is to establish, in a general way, suitable procedures and tolerances for the installation of hydroelectric turbines and generators. This document presents a typical assembly. There are many possible ways to assemble a unit. The size of the machines, design of the machines, layout of the powerhouse and delivery schedule of the components are some of the elements that could result in additional steps, the elimination of some steps and/or assembly sequences.
It is understood that a publication of this type will be binding only if, and to the extent that, both contracting parties have agreed upon it.
Installations for refurbishment projects or for small hydro projects are not in the scope of this document. An agreement between all parties is necessary.
This document excludes matters of purely commercial interest, except those inextricably bound up with the conduct of installation.
The tolerances in this document have been established upon best practices and experience, although it is recognized that other standards specify different tolerances.
Wherever this document specifies that documents, drawings or information is supplied by a manufacturer (or manufacturers), each individual manufacturer will furnish the appropriate information for their own supply only.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
No terms and definitions are listed in this document.
4 Concept
4.1 General
For vertical units, reference axes are defined in relation to upstream, looking at the unit from the generator end (see Figure 1). Upstream corresponds to the Y+ axis, 0° and 12 h 00. The angles increase in the clockwise direction; therefore, the X+ axis corresponds to 90°, the right hand side and 3 h 00.
For horizontal units, upstream is replaced by vertical up and downstream replaced by vertical down.
Figure 1 Axes definition for vertical units
4.2 Reference centre
The reference centre is the best centre of the designated (or specific) component that all other components should be aligned to.
4.3 Best centre
The best centre of a circular shape component corresponds to the point for which the circularity has the minimal deviation. Its location is calculated from a set of radii at equal angles and measured from the reference centre.
Determination: The components x and y of the best centre from the reference centre can be calculated with the following two formulae, where 0° is located upstream and the angle increases clockwise:
where
n——is the number of readings;
Ri——is the measured radius;
θi——is the angular position of each measurement.
Table 1 shows a sample calculation.
Table 1 Sample calculation
The explanation of how to calculate the best centre is given below (see Figure 2):
Thus the best centre of the component is located 0,11 units upstream (Y+) and 0,33 units
to the left (X−) of the reference centre. Calculated radii based on the Best Centre as the
new reference can be calculated in order to calculate circularity.
Figure 2 Best centre sample calculation
4.4 Concentricity
The concentricity is the radial distance, d, from the reference centre to the best centre of
The component (see Figure 3).
Figure 3 Concentricity
4.5 Circularity
Circularity is the difference between the maximum and minimum radii, measured from the
component best centre (see Figure 4).
Figure 4 Circularity
4.6 Reference horizontal plane
The reference horizontal plane is a horizontal plane located at the average elevation of a feature on the component that the other component should be aligned to.
4.7 Reference vertical plane
The reference vertical plane is a vertical plane located at the average distance of a feature on the component that the other component should be aligned to.
