What is a sea chest filter?

a) Sea chest Strainer: Sea chest is fitted in the main suction line of the sea water inlet system to the ship. The filter casing is normally fitted with marine growth preventive system. Normally a strainer is used in the sea chest so that the flow of water in the sea line is always maintained.

What is sea chest valve?

A sea inlet valve and piping connected to the sea chest directs sea water into the ship for the cooling, fire or sanitary purposes. Compressed air or steam connections may be provided to remove ice or other obstructions.

How does a sea chest work?

A sea chest is a recess in a ship’s hull that houses pipes to take in seawater. Water is pumped in for cooling engines, washing decks and as ballast to stabilise the vessel. A sea chest has a grille to keep out large items, but this can also stop smaller organisms from being flushed out.

What is sea suction?

marine. The aperture through which sea water is drawn or the part of a pumping system which admits seawater into it.

What means sea chest?

n. A box or trunk suitable for use by a sailor to store personal property.

How do you test a sea chest valve?

Zibi Kossak

1. Close sea chest valve and block valve .
2. Drain water from section of pipe between sea chest valve and blockvalve .
3. Pressurise pipe to approximately. 3.5 kg/cm² (50 psi).
4. Watch for a pressure drop over.
5. If a pressure drop is noted, check alongside the ship for bubbles of airescaping through the sea chest valve.

What is low sea chest?

The Low Sea Chest is generally used while the ship is in open sea and sailing with a moderate or deep draft. Using the High Sea Chest in open can cause the Main Sea Water pressure to drop as lesser water might enter the suction line of the pipe owing to rolling.

What is high sea chest?

Vessels normally have a high sea chest, which is used in shallow waters to reduce intake of sediment, and a low sea chest, which could be used, among other things, when navigating in ice-covered water (to mitigate the intake of ice and slush) or when the vessel is rolling (to avoid losing suction).

What is sea suction valves?

Introduction: Marine Suction sea valve is the inlet valve that installed at ship two sides, bilge or bottom. Approval Standard: 1. Chapter 2, Part 3 of China Classification Society Rules for Classification of Sea-going Steel Ships 2015 and Its Amendments.

Where are sea chest located?

Sea chests are mostly found in the engine room in the space between the side of the ship which is secured and protected by grids. These grids called ‘sea chest gratings’ prevent the passage of large objects such as trash, fish, nets, etc.

What is high and low sea chest?

How do you clean an underwater sea chest?

To undertake underwater sea chest cleaning (u/w sea chest cleaning) and underwater sea chests grating cleaning. First, the sea chest gratings are cleaned and then removed where two divers take them up to the surface. After that, the diver enters the sea chest and cleans.

How to maintain a sea chest strainer?

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.

How do you use LP air in a sea chest?

The vessels i worked have LP air system connected to sea chest. You can close the sea chest outlet valve after opening standby Seachest valve. Open air system valve and blow the sea chest with LP air to clear off any weed.

What is the purpose of plugging sea-chests?

The Plugging sea-chests is an effective technique, which allows any internal repairs needed in the sea chests, such as changing faulty valves, bathometer, etc. The ship remains at sea, without having to go to dry dock.