SHIPS MAIN DRAINAGE SYSTEM

SYSTEM BASICS

100

WHAT IS THE PRIMARY PURPOSE OF THE MAIN DRAINAGE SYSTEM?

REMOVE SEAWATER/FLOODWATER HAZARDS FROM BILGES

200

WHAT IS THE SUCTION EFFECT IN AN EDUCTOR CALLED?

VENTURI EFFECT

300

YOU CAN REMOVE SEWAGE UTILIZING THE MAIN DRAINAGE SYSTEM, TRUE OR FALSE?

FALSE

400

WHAT IS THE STANDARD GPM THAT INSTALLED EDUCTORS OPERATE AT?

700 GPM

500

WHAT SPACES ONBOARD A SHIP ARE COVERED BY SECONDARY DRAINAGE INSTEAD OF MAIN DRAINAGE?

Forward and aft compartments: The system covers non-engine spaces located forward (towards the bow) and aft (towards the stern) of the main engineering spaces.

Bilges and drainwells: The secondary system can be used to remove accumulated water from bilges and drainwells in various parts of the ship.

Pump rooms, shaft alleys, and steering gear rooms: Like other bilges, these spaces also collect fluids and are covered by the secondary drainage system.

Air conditioning and refrigeration machinery rooms: The bilges in these auxiliary machinery spaces are also served by the secondary drainage system.

Other spaces below the waterline: The system is designed to dewater any compartments located below the waterline that are not served by the main drainage system. 

EDUCTOR OPERATION

100

WHAT IS THE PRIMARY AGENT THAT CREATES THE SUCTION IN AN EDUCTOR?

FIREMAIN

200

WHO'S PERMISSION IS REQUIRED TO ALIGN THE MAIN DRAINAGE SYSTEM OUTSIDE OF 50 NM?

EOOW

300

WHAT IS THE RISK OF MISALIGNING THE MAIN DRAINAGE SYSTEM?

BACK FLOODING

400

HOW DO YOU VERIFY EDUCTOR IS IN OPERATION?

DROP IN BILGE LEVEL, POSITIVE SUCTION PRESSURE, STEADY DISCHARGE OVER THE SIDE.

500

NAME THREE SAFETIES CONCERNED WITH MAIN DRAINAGE EDUCTOR OPERATIONS

OXYGEN DEFECIENT SPACE, HEARING CONSERVATION, FLOODING

PIPING AND COLOR CODES/REFERENCES

100

WHAT IS THE EOSS PROCEDURE FOR ALIGNING MAIN DRAINAGE

DFS/DMDS

200

WHAT NSTM GOVERNS PROPER STENCILING OF PIPING SYSTEMS?

NSTM 505

300

WHAT CLASSIFICATION ARE MAIN DRAINAGE VALVES/FITTINGS? 

X-RAY/CIRCLE X RAY

400

WHAT NSTMS COVERS INSTALLED EDUCTOR OPERATIONS?

079 VOL 2, 593

500

WHEN IS THE COS PERMISSION REQUIRED FOR OPERATION OF THE MAIN DRAINAGE SYSTEM? VIA WHAT INSTRUCTION?

• Oil or fuel: Pumping oil or fuel through the main drainage system could lead to illegal discharges. The CO must approve any operation that risks discharging oil into the ocean, and it must be conducted in compliance with international and U.S. regulations.
• Hazardous materials: The main drainage system should not be used to pump hazardous materials without the CO's explicit approval and the implementation of strict safety protocols. This is to protect the ship's systems and prevent pollution.
• Chemically contaminated water: If water has been contaminated by chemical spills, the CO must approve the dewatering operation. This ensures the proper handling of hazardous waste and prevents environmental contamination.
• DOD MANUAL 4715.06, VOLUME 2 REGULATIONS ON VESSELS OWNED OR OPERATED BY THE DEPARTMENT OF DEFENSE: OIL POLLUTION PREVENTION

MAINTENANCE AND INSPECTION

100

WHAT IS THE MOST COMMON PMS CHECK ASSOCIATED WITH THE MAIN DRAINAGE SYSTEM?

Q2R

200

WHAT ARE SOME COMMON WEAR AND TEAR SIGNS?

EROSION, CORROSION, REDUCED SUCTION PRESSURE

300

IAW THE EDORM WHEN IS THE Q2R PERFORMED FOR MLOCS PRIOR TO UNDERWAY?

7 days

400

WHAT IS THE PURPOSE FOR INSPECTING THE CHECK VALVES IN THE MAIN DRAINAGE SYSTEM?

TO PREVENT BACK FLOODING

500

WHERE ARE EDUCTOR/MAIN DRAINAGE LEAKS RECORDED?

ENGINEERING LOG & 2K (CSMP)

PERMISSIONS AND REGULATIONS

100

IAW THE EDORM WHOS PERMISSION DO YOU NEED TO ALIGN THE MAIN DRAINAGE SYSTEM?

EOOW

200

WHOSE PERMISSION IS REQUIRED TO DISCHARGE OVER THE SIDE AFTER THE MAIN DRAINAGE SYSTEM HAS BEEN ALIGNED?

OOD

300

WHAT IS THE DISTANCE FROM LAND IAW NSTM 593 THAT US NAVAL SHIPS ARE AUTHORIZED TO DISCHARE OVERBOARD?

50 NM

400

WHAT IS THE MAIN INSTRUCTION GOVERNING THE NAVY'S COMPLIANCE WITH THE CLEAN WATER ACT?

OPNAVINST 5090.1 ENVIRONMENTAL READINESS PROGRAM

500

WHO IS THE GOVERNING AUTHORITY FOR DISCHARGING OVERBOARD AND UNDER WHAT PROGRAM?

ENVIRONMENTAL PROTECTION AGENCY (EPA) AND DOD VIA UNIFORM NATIONAL DISCHARGE STANDARDS (UNDS)