5621 International Standard (ISO INTERNATIONAL ORGANIZATION FOR STANDARDIZATION+MEKAYHAPOAHAR OPTAHW3ALWA NO CTAHAAPTW3AUWM+ORGANISATION INTERNATIONALE DE NORMALISATION Shipbuilding - Bilge mud boxes for machinery spaces and tunnels - General design characteristics Construction navale - Boites a vase pour compartiments machines et tunnels - Caracteristiques generales de conception First edition - 1984-12-01 ISO 5621-1984 (E) UDC629.12.011.56 Ref. No.1SO 5621-1984 (E) Descriptors : shipbuilding, mud boxes, design, characteristics, designation. Price based on 3 pages Foreword ISo (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through iso technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, govern- mental and non-governmental, in liaison with Iso, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the ISo Council. They are approved in accordance with ISO procedures requiring at least 75 % approval by the member bodies voting. Shipbuildingandmarinestructures. C InternationalOrganizationforStandardization,1984 Printed in Switzerland ISO 5621-1984 (E) INTERNATIONALSTANDARD Shipbuilding - Bilge mud boxes for machinery spaces and tunnels - General design characteristics Scope and field of application 3.2 Volumes 1.1 This International Standard specifies the general design 3.2.1 total volume (V) : Total internal volume of the box characteristics of mud boxes used between pumps and bilge body, expressed in cubic centimetres. (See figures 1 and 5.) suctions in machinery spaces and tunnels for the coarse filtra- tion of bilge water. 3.2.2 2 upstream volume (Vu) : Internal volume of the box on the side of the strainer plate where bilge water is sucked in. 1.2This International Standard does not specify the design dimensions nor the materials of mud boxes. This volume is calculated neglecting nozzles. It is expressed in cubic centimetres. (See figures 2 and 6.) 1.3 This International Standard applies to deep sea ships and inland navigation ships. 3.2.3 downstream volume (Vq) : Internal volume of the box NOTE -- Users should note that while observing the requirements of on the side of the strainer plate connected to the pumps. this International Standard, they should at the same time ensure com- pliance with such statutory requirements, rules and regulations as may This volume is calculated neglecting nozzles. It is expressed in be applicable to the individual ship concerned. cubic centimetres. (See figures 3 and 7.) Description 3.2.4 .useful upstreamvolume(U):Partof theupstream volume receiving waste. It is expressed in cubic centimetres. A mud box is composed of : (See figures 4 and 8.) a body having flanged inlet and outlet branches; 3.3 Types a filter element consisting of a perforated plate which may be flat, folded or formed. 3.3.1 straight-through mud box (ST) : Mud box having inlet and outlet branches on the same axis. (See figures 1 to 4.) NOTE - In the remainder of this text, the filter element is designated as a strainer plate. 3.3.2 right-angled mud box (RA) : Mud box having inlet and outlet branches at right-angles to one another, the inlet 3 Definitions branch being in the vertical plane and the outlet branch in the horizontal plane. 3.1 mud box nominal size (DN): Nominal size of its branches. 3.4 open area coefficient of the strainer plate : Ratio of the total open area through the apertures to the total area of The nominal sizes (DN) and the outside diameter (De) of the the perforated plate. associated branches are as follows1) : DN : 40- 50 65- 80 - 100 - 125 150 200 - 250 3.5 open area co