Schottel Pump-Jet is the jet propulsion equipment whereby the biggest possible thrust can constantly be generated omnidirectionally even in shallow waterways, utilizing the principle of the centrifugal pump. The equipment was successfully developed by SCHOTTEL, Germany in 1980, their enjoying delivery record of approximately 850 sets having so far been sold for installation onto various kinds of vessels including naval vessels not only in Europe mainly but also all over the world.
This paper describes the principle, structure and characteristics of Pump-Jet, with additional explanation being made in respect of the comparison in performance with water jets, of the underwater noise level compared with conventional propellers, and of the comparison in performance with various type of thrusters for the case of the Pump-Jet to be used as a bow thruster.

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Due to increase in use of lower grade fuel oil, increasing quantities of waste oils, which are from main engine, from equipment for treating fuel oils such as purifiers and strainers, as well as from tanks, have been generated.
These waste oils, after having undergone a process for separating water from oils, are finally disposed of by means auxiliary boiler or incinerator, in which the series of processes for treating waste oils are labor-intensive, thereby requiring an improved way of treating waste oils, partly pressed by the necessity for labor-and energy-saving aboard vessels as well as for prevention of marine pollution.
The following information represents a new waste oils treating method conducted, in cooperation with shipowner, on a decanter-type centrifuge, several tens of which we have ever delivered to customers.
Aboad the vessels mentioned in this information, recovered and purified waste oils are used as fuel oils by mixing it with fuel oils at the rate of 1 : 100, thereby achieving labor-saving in waste oils treatment as well as energy-saving through reduced fuel consumption.

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Recently, the marine butterfly valves have been applied to many machinery piping systems owing to their advantages regarding the construction, function and material cost. Therefore, according to the research for the application results of butterfly valves to the shipyards in our commitee, we have completed the application guidance for butterfly valves to marine machinery piping systems.

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Various reserve piping arrangements are so installed in engine room as to ensure safety navigation for ship and mainteinability of machinery.
These reserve piping arrangements have deep relations with reliability, safety, automation etc., and ship owner's and ship builder's opinions are devided on the vecessity of each reserve piping arrangement.
This paper presents such a quide for installation of reserve piping arrangements as future reduced manning ships that were reserched and discussed by Machinery Plant Comittee Group 3

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Efficiency of overhauling and lifting works in ship's engine room is one of the most important factors for improving the quality and reliability of whole engine plant.
The efficiency heavily depends on the particular of the devices and their arrangement.
This papaer is prepared for designer's covenience to design the overhauling and lifting devices in engine room.

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Recently, the number of ships which are intended to apply Under-water Survey is increasing in order to extend docking interval.
In the rules, there are some recommendations regarding diver's safety during under-water survey.
This paper shows design guidance for hull openings such as sea chest and overboard discharges from the above view-point.

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In general, the most societies do not have a definite standard of the pipe support, which is specified by ship builder's own practice based upon their experiences.
In this paper, such various design standards of the pipe supports, especially in machinery part, are collected by questionnaire to several ship builders and typical ones are introduced commonly as the useful guidance for the design of ship building.

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In this paper, investigation result about mesh of strainer is reported.

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