NDTnet 1998 Aug, Vol.3 No.8

Abstract

Liquid oxigen, tetroxide nitrogen, kerosene, nonsymmetric hydrosine, ammonia are known to be used as components of rocket fuel. In this cases the leak-tightness of the rockets is of significant value as the smallest leakage in fuel system presents the serious hazard [1]. The purpose of work is the development of such leak detection techniques which will exclude the pollution of dry rocket compartment. This is achieved by setting up the scientific founded standards of leak testing. According to such approach the standards of leak testing may have the following meaning (table 1)
Table 1

Standards of leak-tightness verification of rocket units and joints
Units, joints	Permissible non-tightness, m3Pa/s
Tank	10-7
Tank bottom	10-8
Automatic units	10-9
Pipelines	10-9
Coupling	10-9

The leak-tightness verification is provided with helium leak detector. The special techniques base been developed to obtain high sensitivity during testing welded joints, tanks and other units. When fuel systems was fueled with ammonia leak detector with piezoquartz sensor was developed. Before leak testing vacuum heat treatment of units was used to open all through defects.
The technique developed is proved to provide high tightness of rockets after their refuelling,

1. Kanfman, A., Constanza, S., J. Heating, piping and air conditioning, 1965, 9: 107-112

Abstract Source:
Book of Abstracts, 7th European Conference on Non-Destructive Testing, 26-29 May 1998, ISBN: 87-986898-0-00

Full-Text Source:
Proceedings of the 7th European Conference on Non-Destructive Testing, 26-29 May 1998, ISBN:

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