What is the correct procedure to follow while cleaning sea chest strainers?

asked 07 Mar '17, 18:18

March 7, 2017, 6:18 p.m.
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Answer:

Cleaning of sea chest strainers is one of critical operations on board. Failure to follow basic safety rules lead to possible ER flooding. Both inboard and especially outboard valves must be in good order and do not leak. Whenever cleaning required the following procedure to be followed:

  1. Before closing inboard and outboard valves check condition of sea chest strainer vent valve. Open it slightly and make sure water is flowing from it. If there is no water then vent valve is chocked. It must be unblocked by supplying of water or compressed air. In case vent valve can not be unblocked or broken special attention to the following steps to be paid.
  2. Close inboard and outboard valves of sea chest strainer. Open vent valve and ensure there is no water flowing through it. In case there is a water coming out a risk assessment must be conducted to evaluate flow rate and danger of flooding. Only after water ingress decided manageable cleaning could be commenced. Subject to approval from Captain and Company for undertaking a risk.
  3. Loose nuts/bolts which hold down sea chest filter cover. Never remove them all, at least 4 check nuts must be left loosen but in place. This will secure cover from being flushed away be water. Make sure there is no water ingress before proceeding. In case of water ingress in must be evaluated for possibility of flooding. If there is no leakage or it small enough to be managed by constan pumping remaining nuts/bolts could be removed and cover taken away.
  4. Clean the strainer. Inspect for damages. Repair or replace if necessary.
  5. Clean and inspect the strainer body
  6. Inspect cover gasket. Renew if necessary.
  7. Inspect vent valve. Clean, repair or replace if necessary.
  8. Assemble strainer. Tighten the cover.
  9. Open outboard valve slightly. Check for proper tightening of cover. Release the air from strainer by opening the vent valve until water comes. Failure to do this may cause sea water pumps to loose suction as air from strainer travels through the SW system.
  10. Open the inboard valve.
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answered 07 Mar '17, 18:50

March 7, 2017, 6:50 p.m.
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