Porthole tank test

TANK TEST: When the production of the portholes are finished, they are installed on the high pressure tanks. In this test, the strength of the  portholes frames, storm shutters, glasses are checked. The test is also used to control the tightness of the porthole. 

BALL DROP TEST: When the lamination of the glass is finished, it is controled via ball drop test. The weight and the shape of the steel ball; the heihgt of the dropping height are determined by international standart societies. 
The aim of the test is to control the pvb. Lamination material should not be teared off although  the glass is broken.  
Tank test is to check the effects of the hydrostatic pressure. The ball drop test is to measure the impact effect.