Vacuum technology. Turbomolecular pumps. Measurement of rapid shutdown torque

BS ISO 27892:2010 Vacuum technology. Turbomolecular pumps. Measurement of rapid shutdown torque

BS ISO 27892 specifies a method for the measurement of rapid shutdown torque (destructive torque) of turbomolecular pumps in which gas momentum is produced by axial flow type blades and/or helical channels. The main forces leading to failure of turbomolecular pumps are torques around the rotational axis.

Other insignificant forces and moments that can occur lie outside the scope of BS ISO 27892.

There are two kinds of failure: rapid shutdown by whole burst and softer crash of rotor. BS ISO 27892 applies to both. The same measurement method can be used for turbomolecular pumps and molecular drag pumps.

Contents of BS ISO 27892:

Foreword

Introduction

1 Scope

2 Normative references

3 Terms and definitions

4 Symbols, definitions, and units

5 Destructive test methods for turbomolecular pumps

5.1 General

5.2 Items to be checked

5.3 Test conditions for burst and crash (failure of rotor body and rotor blades)

5.4 Destructive test equipment

5.5 Destructive test procedures

5.6 “Crash” destructive test method (failure of rotor or stator blades)

6 Test report

Annex A (informative) Details to be stated in technical drawings and documents

Bibliography