Question 957 Deck General

The correct answer is D) A stop valve. According to the regulations, each outlet of the fixed piping system for discharging oily mixtures ashore on a non-oceangoing vessel must be equipped with a stop valve. This valve allows the operator to control and shut off the flow of the oily mixture at that particular outlet, which is a key safety feature to prevent unintended discharges. The other answer choices are incorrect because they do not fully meet the regulatory requirement for a stop valve at each outlet. Option A) is not specific enough, option B) only requires a means to stop the pump rather than a valve at the outlet, and option C) calls for a non-return valve which is a different type of valve.