MTC Marine Plumbing & Sanitation Systems 1

Question 1

What type of valve must be installed on all thru-hull fittings located below the vessel's waterline?

Accepted Answer

Seacock (tapered plug or ball valve)

Answer

ABYC standards require a seacock at all below-waterline thru-hull fittings to allow immediate emergency shutoff and prevent flooding.

Question 2

Which U.S. federal regulation classifies Marine Sanitation Devices (MSDs) into Types I, II, and III?

Accepted Answer

Title 33 CFR Part 159

Answer

33 CFR Part 159 is the EPA/USCG regulation establishing federal standards for Marine Sanitation Devices and their classification system.

Question 3

A Type III Marine Sanitation Device (MSD) is best described as which of the following?

Accepted Answer

A holding tank that retains all sewage for pump-out ashore

Answer

A Type III MSD is a holding tank that stores all sewage onboard without any discharge, requiring pump-out at an approved shore facility.

Question 4

What is the purpose of a Y-valve in a marine sanitation system?

Accepted Answer

To divert waste flow between the holding tank and overboard discharge

Answer

A Y-valve allows the operator to direct waste flow either to the holding tank or, where legally permitted, to overboard discharge.

Question 5

Which fitting material is NOT acceptable for use in a vessel's potable (drinking) water system?

Accepted Answer

Lead-containing bronze fittings

Answer

Lead-containing fittings are prohibited in potable water systems because lead can leach into drinking water, creating a serious health hazard.

(MTC) Marine Technician Certification Practice Test