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JB/T 6752-2013Medium and small hydraulic turbine runner static balancing test code (English PDF)

中小型水轮机转轮静平衡试验规程

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Issued by

MIIT

Level / Type

Industry · Recommended

Issue date

December 31, 2013

Implementation date

July 1, 2014

Scope

JB/T 6752-2013 is the English-translated version of 中小型水轮机转轮静平衡试验规程.

JB/T 6752-2013 is the Chinese standard "Medium and small hydraulic turbine runner static balancing test code". Its scope clause reads: This standard specifies the balance method, balance quality grade and corresponding inspection method of static balancing of medium and small hydraulic turbine runner.

This standard is applicable to the inspection and acceptance of static balance quality of medium and small hydraulic turbine runners meeting one of the following conditions: a) the power is 10 MW or below; b) Francis and impulse turbines with runners of nominal diameter of 1.0 m or less; c) axial and tubular turbines with runners of nominal diameter of 3.3 m or less.

Other types of turbine runners, flywheels, rotating oil basins and other turbine rotating parts may be used for reference. Its clauses include terms and definitions.

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Document preview — JB/T 6752-2013

National Standard of the People's Republic of China

ICS: 27.140
Replacing: JB/T 6752-1993

Issued by: Ministry of Industry and Information Technology of the People's Republic of China

Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Application scope of runner static balancing, allowable amount of unbalance and balance quality grade
4.1 Application scope of runner static balancing
4.2 Runner mass and allowable amount of unbalance
4.3 Runaway speed and allowable amount of unbalance
4.4 Balance quality grade
4.5 Allowable amount of unbalance
5 Static balancing
5.1 General
5.2 Horizontal static balancing
5.3 Vertical static balancing
5.4 Determination of unbalance
5.5 Error of allowable unbalance
6 Test report

1 Scope

This standard specifies the balance method, balance quality grade and corresponding inspection method of static balancing of medium and small hydraulic turbine runner.

This standard is applicable to the inspection and acceptance of static balance quality of medium and small hydraulic turbine runners meeting one of the following conditions:

a) the power is 10 MW or below;

b) Francis and impulse turbines with runners of nominal diameter of 1.0 m or less;

c) axial and tubular turbines with runners of nominal diameter of 3.3 m or less.

Other types of turbine runners, flywheels, rotating oil basins and other turbine rotating parts may be used for reference.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated reference, only the edition cited applies. For undated references, the latest edition of the referenced documents (including any amendments) applies.

GB/T 2900.45 Electrotechnical terminology — Hydroelectric powerplant machinery

GB/T 6444 Mechanical vibration — Balancing vocabulary

GB/T 9239.1-2006 Mechanical vibration — Balance quality requirements for rotors in a constant (rigid) state — Part 1: Specification and verification of balance tolerances

3 Terms and definitions

For the purposes of this document, the terms and definitions given in GB/T 2900.45, GB/T 6444 and GB/T 9239.1-2006 apply.

4 Application scope of runner static balancing, allowable amount of unbalance and balance quality grade

4.1 Application scope of runner static balancing

The application scope of the runner static balancing is expressed by the relation curve between the overall dimension ratio of the runner b/D (b is the height of the runner and D is the maximum outer circle diameter of the runner) (see Figure 1) and the runaway speed nrun(see Figure 2).

In Figure 2, the runner below the curve "1" only needs to be subjected to static balancing, while the runner above the curve "2" should conduct the dynamic balancing; and whether the runner between curve "1" and curve "2" is subjected to dynamic balancing depends on factors such as runner mass, manufacturing process, processing condition (partial processing or full processing) and bearing distance.

4.2 Runner mass and allowable amount of unbalance

Generally speaking, the greater the mass of the runner is, the greater the allowable amount of unbalance will be, so it may be expressed by Equation (1).

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

Referenced standards

Normative references

Cited by

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JB/T 7023-2014|NB/T 10476-2020|NB/T 42128-2017|NB/T 42054-2015|NB/T 42056-2015|GB/T 9239.13-2023

Editions of JB/T 6752

Edition	Title	Revision	Status
JB/T 6752-2013	Medium and small hydraulic turbine runner static balancing test code	current edition	Current
JB/T 6752-1993	Medium and small hydraulic turbine runner static balancing test code	previous edition	Superseded

This page sells the current edition, JB/T 6752-2013. Earlier editions are listed for reference only.

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