Abstract
In this paper deals with experiments on the relation between the seal water loss (SWL) and the pressure wave for the test of trap performance which was suggested in former reports. The main results of the experiments can be summarized as follows. 1) The relation between SWL and the minimum pressure is expressed by linear functions with 0 constant and the coefficient of determination is over 0.9 in almost all cases. 2) Increase of the ratio of leg's cross sectional area (=outlet leg area/inlet leg area) degrease SWL and the effect of the ratio on the SWL in case of bell trap is greater than in case of contrary bell trap.
