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Written by Administrator
Tuesday, 22 December 2009 15:15

The particular use of expansion joint requires the highest degree of reliability.

This has to be kept in mind during the design, when choosing materials and when manufacturing the expansion joints, which is supported by extremely attentive quality control.
Materials are strictly checked on receipt to establish their correspondence to particulary severe specifications.
During construction we perform the under mentioned test in addition to dimensional control:

  • Hardness test
  • Drawability test
  • Tensile test
  • Impact test
  • X-ray
  • Ultrasonic examinations
  • Dye-penetrant test
  • Magnetic particle axamination
  • Metallographic examination

Eache expansion joint is pneumatically tested at low pressure to control the good tightness of the welding between bellows and connections.

ITEM
CONTROL STANDARD
ON DEMAND
1 Dimensional Alway performed /
2 Longitudinal weld of the bellows with ply thickness &Mac178;1mm Visual and Ericksen test Dye-penetrant test
3 Longitudinal weld of the bellows with ply thickness >1 X-ray, Dye-penetrant test
4 Weld between bellows and welding end connection or flange Visual Dye-penetrant test
5 Butt-weld Visual X-ray, Dye-penetrant test
6 Fillet weld of flanges Visual Dye-penetrant test
7 Hardware welds Visual Dye-penetrant test
8 Tightness test Pneumatic at low pressure under vacuum at helium
9 Internal pressure test Not performed* Hydrauli

* Pressure test executed only by request, as the integrity and reliability of the expansion joint are guaranted by a careful design of the components and by many tests performed in our laboratories.

Last Updated ( Friday, 12 March 2010 12:23 )