Please explain why at 3 way valves there are 2 go collecting chamber?

Hi
Please check this article for the requirements – https://www.marineinsight.com/maritime-law/marpol-annex-1-explained-how-to-prevent-pollution-from-oil-at-sea/

I can’t be sure difference usage of OWS in and out of special areas for oil tankers.

Please, can you expain it?

@Sinthu: The Oil content monitor needs to be serviced by shore technician

@Gulshan Kumar

Absolutely not. The Basic purpose of both the machines are different and the amount of OIL they handle is the key. OWS is used for removing small amount oil from a large quantity of water. The difference in densities of bilge water (which is processed in OWS) is small compared to the feed or purifier.

Centrifuges, however, used to do opposite task- remove water from a larger oil quantity. They also need to remove solid impurities and sludge.

The procedures for testing the monitor are detailed in the manufactures technical manual. The OWSs I have experience utilize a photo sensor that measures the amount of light hitting it. When oil or sediment travels between the light and the photo sensor, it reduces the amount of light hitting the sensor and causes the monitor to display a PPM of contaminate in the water. On the OWSs I have seen, the manufacture provides plastic test trips that have been gauged to simulate oily water contamination. This test trip is placed between the light and the photo-sensor through an inline access point. The monitor should display the predetermined reading when this test is conducted. Ships also send these sensors out to be tested and calibrated on a scheduled basis.