EN ISO 8861:1998

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Shipbuilding - Engine-room ventilation in diesel-engined ships - Design requirements and basis of calculations (ISO 8861:1998)Schiffbau - Maschinenraum-Lüftung auf Schiffen mit Dieselmotoren-Antrieb - Grundlagen für Entwurf und Auslegung (ISO 8861:1998)Construction navale - Ventilation du compartiment machines des navires a moteurs diesels - Exigences de conception et bases de calcul (ISO 8861:1998)Shipbuilding - Engine-room ventilation in diesel-engined ships - Design requirements and basis of calculations (ISO 8861:1998)47.020.90Marine ventilation, air-conditioning and heating systemsICS:Ta slovenski standard je istoveten z:EN ISO 8861:1998SIST EN ISO 8861:2000en01-december-2000SIST EN ISO 8861:2000SLOVENSKI
STANDARD
AReference numberISO 8861:1998(E)INTERNATIONALSTANDARDISO8861Second edition1998-05-15Shipbuilding — Engine-room ventilation indiesel-engined ships — Designrequirements and basis of calculationsConstruction navale — Ventilation du compartiment machines des navires àmoteurs diesels — Exigences de conception et bases de calculSIST EN ISO 8861:2000

ISO 8861:1998(E)©
ISO 1998All rights reserved. Unless otherwise specified, no part of this publication may be reproducedor utilized in any form or by any means, electronic or mechanical, including photocopying andmicrofilm, without permission in writing from the publisher.International Organization for StandardizationCase postale 56 · CH-1211 Genève 20 · SwitzerlandInternetcentral@iso.chX.400c=ch; a=400net; p=iso; o=isocs; s=centralPrinted in SwitzerlandiiForewordISO (the International Organization for Standardization) is a worldwidefederation of national standards bodies (ISO member bodies). The work ofpreparing International Standards is normally carried out through ISOtechnical committees. Each member body interested in a subject for whicha technical committee has been established has the right to be representedon that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISOcollaborates closely with the International Electrotechnical Commission(IEC) on all matters of electrotechnical standardization.Draft International Standards adopted by the technical committees arecirculated to the member bodies for voting. Publication as an InternationalStandard requires approval by at least 75 % of the member bodies castinga vote.International Standard ISO
8861 was prepared by Technical CommitteeISO/TC 8, Ships and marine technology, Subcommittee SC 3, Piping andmachinery.This second edition cancels and replaces the first edition (ISO 8861:1988),of which it constitutes a technical revision.Annex A of this International Standard is for information only.SIST EN ISO 8861:2000

INTERNATIONAL STANDARD
© ISOISO 8861:1998(E)1Shipbuilding — Engine-room ventilation in diesel-enginedships — Design requirements and basis of calculations1
ScopeThis International Standard specifies design requirements and suitable calculation methods forthe ventilation of the engine room in diesel-engined ships, for normal conditions in all waters.Annex A provides guidance and good practice in the design of ventilation systems for ships'engine rooms.NOTE —
Users of this International Standard should note that, while observing the requirements of thestandard, they should at the same time ensure compliance with such statutory requirements, rules andregulations as may be applicable to the individual ship concerned.2
Normative referencesThe following standards contain provisions which, through reference in this text, constituteprovisions of this International Standard. At the time of publication, the editions indicated werevalid. All standards are subject to revision, and parties to agreements based on this Interna-tional Standard are encouraged to investigate the possibility of applying the most recenteditions of the standards listed below. Members of IEC and ISO maintain registers of currentlyvalid International Standards.ISO 31-1:1992, Quantities and units — Part 1: Space and time.ISO 31-3:1992, Quantities and units — Part 3: Mechanics.ISO 31-4:1992, Quantities and units — Part 4: Heat.ISO 3046-1:1995, Reciprocating internal combustion engines — Performance — Part 1:Standard reference conditions, declarations of power, fuel and lubricating oil consumptions, andtest methods.ISO 3258:1976, Air distribution and air diffusion — Vocabulary.3
DefinitionsFor the purposes of this International Standard, the definitions given below, together with thosein ISO 31-1, ISO 31-3, ISO 31-4, ISO 3046-1 and ISO 3258, apply.3.1
engine room: Space containing main propulsion machinery, boiler(s), diesel generator(s)and major electrical machinery, etc.SIST EN ISO 8861:2000

ISO 8861:1998(E)© ISO23.2
ventilation: Provision of air to an enclosed space to meet the needs of the occupantsand/or the requirements of the equipment therein.3.3
service standard power: The continuous brake power which the engine manufacturerdeclares that an engine is capable of delivering, using only the essential dependent auxiliaries,between the normal maintenance intervals stated by the manufacturer and under the followingconditions:a)at a stated speed at the ambient and operating conditions of the engine application;b)with the declared power adjusted or corrected as determined by the manufacturer to thestated ambient and operating conditions of the engine application;c)with the maintenance prescribed by the engine manufacturer being carried out.[ISO 3046-1:1995]See A.1 in annex A of ISO 3046-1:1995.4
Design conditionsThe outside ambient air temperature shall be taken as + 35 °C.Temperature rise from air intake to air passing from the engine room up to the casing entranceshall be max. 12,5 K.The capacity of the ventilation plant should be such as to provide comfortable workingconditions in the engine room, to supply the necessary combustion air to the diesel engine(s)and boiler(s), and to prevent heat-sensitive apparatus from overheating.In order to meet these requirements, the air should be distributed to all parts of the engineroom, so that pockets of stagnant hot air are avoided. Special considerations should be given toareas with great heat emission and to all normal working areas, where reasonably fresh andclean outdoor air should be provided through adjustable inlet devices.When arranging the air distribution, all normal conditions at sea and in harbour for in-servicemachinery shall be taken into account.5
Airflow calculation5.1
Total airflowThe total airflow Q to the engine room shall be at least the larger value of the two followingcalculations.a:Q = qc + qh as calculated according to 5.2 and 5.3 respectively.b:Q = 1,5 x qc, i.e. the airflow for combustion + 50 %. The total airflow to the engine roomshall not be less than the airflow for combustion [engine(s) and boiler(s)] plus 50 %.SIST EN ISO 8861:2000

© ISOISO 8861:1998(E)3Combustion air to, and heat emission from, all equipment installed within the casing and funnelshall not be taken into account.The calculations shall be based on simultaneous maximum rating of main propulsion dieselengine(s), diesel generator engine(s), boiler(s) and other machinery under normal seaconditions, and on a temperature increase of 12,5 K.The calculations should, to the greatest possible extent, be based on information from themanufacturers. Guidance values given in this International Standard should be used only whenmanufacturers' information is not available.In order to ensure satisfactory air distribution, combustion air to, and heat emission from, mainpropulsion diesel engine(s), diesel generator engine(s), generator(s), boiler(s), and possiblyother machinery with considerable heat emission, shall be calculated separately including otherconditions as necessary.Spaces separated from the main engine room, such as individual auxiliary engine rooms, boilerrooms and separator rooms, shall also be calculated separately.5.2
Airflow for combustion5.2.1
Sum of airflow for combustionThe sum of the airflow for combustion, qc, shall be calculated, in cubic metres per second, asfollows:qc =
qdp + qdg + qbwhereqdpis the airflow for combustion for main propulsion diesel engine(s), in cubic metresper second (see 5.2.2);qdgis the airflow for combustion for diesel generator engine(s), in cubic metres persecond (see 5.2.3);qbis the airflow for combustion for boiler(s), in cubic metres per second (see 5.2.4), ifrelevant under normal sea conditions.5.2.2
Airflow for combustion for main propulsion diesel engine(s)The airflow for combustion for the main propulsion diesel engine(s), qdp, shall be calculated, incubic metres per second, as follows:dpdpad =
qPm´rSIST EN ISO 8861:2000
ISO 8861:1998(E)© ISO4wherePdpis the service standard power of the main propulsion diesel engine(s) at maximumcontinuous power output, in kilowatts;madis the air requirement for combustion for diesel engine(s), in kilograms per kilowattsecond;NOTE —
Where specific data for mad are not available, the following values may be used forcalculation:mad=0,002 3 kg/(kW×s) for 2-stroke engines,0,002 0 kg/(kW×s) for 4-stroke engines.r = 1,13 kg/m3 (i.e. the density of air, at + 35 °C, 70 RH and 101,3 kPa).5.2.3
Airflow for combustion for diesel generator engine(s)The airflow for combustion for diesel generator engine(s), qdg, shall be calculated, in cubicmetres per second, as follows:dgdgad =
qPm´rwherePdgis the service standard power of the diesel generator engine(s) at maximum poweroutput, in kilowatts;madis the air requirement for diesel engine combustion, in kilograms per kilowatt second;NOTE —
Where specific data for mad are not available, the following values may be used forcalculation:mad=0,002 3 kg/(kW×s) for 2-stroke engines,0,002 0 kg/(kW×s) for 4-stroke eng
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