Bilge System Deficiencies Found During PSC Inspection
During a PSC inspection of a 90 m general cargo ship, the inspector traces the bilge system. The bilge main is 100 mm bore and runs fore-and-aft. In No. 2 cargo hold, an independent bilge suction of 65 mm bore is connected to the main through a length of flexible hose and two hose clamps; the non-return valve is installed with the arrow pointing toward the bilge suction. In the engine room, the emergency bilge suction is connected to the main seawater cooling pump, but the isolating valve is seized open and the suction pipe has a 20 mm hole patched with a rubber clamp. The bilge main also has a cross-connection to the ballast system with a removable spool piece; the spool is currently installed. The chief engineer says the flexible hose is "only for the inspection" and that the ballast cross-connection is used to strip the holds. The vessel has a valid class certificate but the inspector issues a deficiency. The superintendent asks which items are SOLAS deficiencies and what must be done before the ship can sail.
1. Identify which findings are deficiencies and explain why, including priority.
Read the worked answer
The flexible hose with hose clamps is a deficiency: a fixed bilge suction must be a permanent metallic pipe with approved joints, not a temporary hose; it can collapse, leak or fail and is not fire-resistant. The non-return valve arrow points toward the bilge suction, which is backward: it will block the suction and can allow water to backflow into the hold. The emergency bilge suction is also deficient: the valve is seized open, the suction pipe is holed and patched with a rubber clamp, and the arrangement is not reliable; it must be repaired and clearly marked. The ballast/bilge cross-connection with a removable spool is a serious concern: if not shown on the approved arrangement, it is an unauthorized modification that can allow ballast water into the bilge or bilge water into ballast, causing flooding or pollution. Verify against SOLAS II-1 and the class-approved bilge/ballast diagram; priority is the direct flooding path and the non-return valve.
2. Describe the corrective actions and tests required for each deficiency.
Read the worked answer
Corrective actions: replace the flexible hose with steel pipe and approved joints; install the non-return valve in the correct direction, with the arrow toward the bilge main or overboard direction as shown on the approved drawing, and test it; renew the holed emergency bilge suction pipe, free and repair the valve, and mark the valve "Emergency Bilge Suction"; remove the unauthorized spool or obtain class approval for a properly designed cross-connection with adequate isolation and non-return protection. After repair, hydrotest the affected sections at 1.5 × design pressure, operate the bilge pump and emergency suction, and verify no backflow. Check that bilge suctions in all compartments are clear and that the bilge main is not connected to ballast except as approved.
3. What documentation and follow-up should close out the inspection?
Read the worked answer
Document the deficiencies and corrections in the PSC/class records; update the bilge/ballast arrangement drawing and as-built; obtain surveyor attendance and a class report before departure. The PSC deficiency should be closed with objective evidence: photos, test records and a surveyor's statement. If the cross-connection is part of the approved design, produce the approved drawing and procedure; if not, remove it. Do not sail until the non-return valve, emergency suction and flooding-path items are corrected; other items may be subject to a condition of class only if the surveyor agrees.