1、STD*BSI BS EN IS0 BBbL-ENGL 1998 = Lb24669 07L0884 438 BRITISH STANDARD Shipbuilding - Engine-room ventilation in diesel-engined ships - Design requirements and basis of calculations The European Standard EN IS0 8861:1998 has the status of a British Standard ICs 47.020.90 NO COPYING WITHOUT BSI PERM
2、ISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW 3s EN IS0 3861:1998 STDmBSI BS EN IS0 B8bl1-ENGL 3998 m 3624669 0730885 374 m Amd. No. BS EN IS0 8861:1998 Date Text affected National foreword This British Standard is the English language version of EN Is0 8861:1998. It is identical with IS0 8861:1998. T
3、he TJK participation in its preparation was entrusted to Technicd Committee SW2, Steering committee for shipbuilding and marine standards, which has the responsibility to: - aid enquirers to understand the text; - present to the responsible internationaVEuropean committee any enquiries on the interp
4、retation, or proposals for change, and keep the K interests informed; - monitor related international and European developments and promulgate them in the UK. This British Standard, having been prepared under the direction of the weering Sector Board, was published under the authority of the Standar
5、ds Board and comes into effect on 15 Juiy 1998 O BSI 1998 A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards normaiiy include an annex which lists normative references to in
6、ternationai publications with their corresponding European publications. The British Standards which implement these international or European publications may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index“, or by using the “Find“ fa
7、cility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correction application. Compliance with a British Standard does not of itself confer immunity from legal o
8、bligations. ISBN O 580 29618 O EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN IS0 8861 May 1998 ICs 47.020.90 Descriptors: see IS0 document English version Shipbuilding - Engine-room ventilation in diesel-engined ships - Design requirements and basis of calculations (IS0 8861 :1998) Construcli
9、on navale - Ventilation du compartiment mechines des navires moteurs diesels - Exigences de concepon et base de calcul (IS0 B861:1998) Schiffbeu - Maschinetnnraum-Ltung auf Schh mH ies b) with the declared power adjusted or corrected as determined by the manufacturer to the stated ambient and operat
10、ing conditions of the engine application; c) with the maintenance prescribed by the engine manufacturer being carried out. IS0 3046-1:1995 See A.1 in annex A of IS0 3046-13995. 4 Design conditions The outside ambient air temperature shall be taken as + 35 OC. Temperature rise from air intake to air
11、passing from the engine room up to the casing entrance shall be max. 12,5 K. The capacity of the ventilation plant should be such as to provide comfortable working conditions in the engine room, to supply the necessary combustion air to the diesel engine(s) and boiler(s), and to prevent heat-sensiti
12、ve apparatus from overheating. In order to meet these requirements, the air should be distributed to all parts of the engine room, so that pockets of stagnant hot air are avoided. Special considerations should be given to areas with great heat emission and to all normal working areas, where reasonab
13、ly fresh and clean outdoor air should be provided through adjustable inlet devices. When arranging the air distribution, all normal conditions at sea and in harbour for in-service machinery shall be taken into account. 5 Airflow calculation 5.1 Total airflow The total airflow Q to the engine room sh
14、all be at least the larger value of the two following calculations. - a: Q = qc + q, as calculated according to 5.2 and 5.3 respectively. - b: Q = 1,5 x qc, .e. the airflow for combustion + 50 %. The total airflow to the engine room shall not be less than the airflow for combustion engine( and boiie
15、r(s) plus 50 %. 2 - - STDmBSI BS EN IS0 8861-ENGL 1998 1624669 0710892 504 EN IS0 8861:1998 Combustion air to, and heat emission from, all equipment installed within the casing and funnel shall not be taken into account. The calculations shall be based on simultaneous maximum rating of main propulsi
16、on diesel engine), diesel generator engine), boiler(s) and other machinery under normal sea conditions, and on a temperature increase of 12,5 K. The calculations should, to the greatest possible extent, be based on information from the manufacturers. Guidance values given in this International Stand
17、ard should be used only when manufacturers information is not available. In order to ensure satisfactory air distribution, combustion air to, and heat emission from, main propulsion diesel engine(s), diesel generator engine(s), generator(s), boiler(s), and possibly other machinery with considerable
18、heat emission, shall be calculated separately including other conditions as necessary. Spaces separated from the main engine room, such as individual auxiliary engine rooms, boiler rooms and separator rooms, shall also be calculated separately. 5.2 Airflow for combustion 5.2.1 Sum of airflow for com
19、bustion - The sum of the airflow for combustion, 9c, shall be calculated, in cubic metres per second, as follows: E E - - - - e * m ak 9c = 9dp + 9dg + 9b where 9dp is the airflow for combustion for main propulsion diesel engine(s), in cubic metres per second (see 5.2.2); 9dg is the airflow for comb
20、ustion for diesel generator engine(s), in cubic metres per second (see 5.2.3); b is the airflow for combustion for boiler(s), in cubic metres per second (see 5.2.4), if relevant under normal sea conditions. 5.2.2 Airflow for combustion for main propulsion diesel engine(s) The airflow for combustion
21、for the main propulsion diesel engine(s), qdp, shall be calculated, in cubic metres per second, as follows: 3 STD-BSI BS EN IS0 88bL-ENGL 1998 m 1624669 0710893 440 m EN IS0 8861:1998 where Pdp is the service standard power of the main propulsion diesel engine( at maximum continuous power output, in
22、 kilowatts; mad is the air requirement for combustion for diesel engine), in kilograms per kilowatt second; NOTE- Where specific data for mad are not available, the following values may be used for calculation: mad = 0,002 3 kg/(kW-s) for 2-stroke engines, 0,002 O kg/(kW-s) for 4-stroke engines. p =
23、 1,13 kg/m3 (.e. the density of air, at + 35 OC, 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), qdg, shall be calculated, in cubic metres per second, as follows: where is the service standard power of the die
24、sel generator engine(s) at maximum power output, in kilowatts; mad is 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 for calculation: mad = 0,002 3 kg/(kW-s) for 2-stroke engine
25、s, 0,002 O kg/(kW.s) for 4-stroke engines. p = 1,13 kg/m3 (.e. the density of air, at + 35 OC, 70 % RH and 101,3 kPa). 5.2.4 Airflow for combustion for boilers and thermal fluid heaters The airflow for combustion for boiler(s), q, shall be calculated, in cubic metres per second, as follows: In a cas
26、e where the total steam capacity of a boiler is known, the following formula is used: 4 STD-BSI BS EN IS0 8861-ENGL 1998 = 1624669 0710894 387 EN IS0 8861:1998 In a case where the capacity of a boiler or a thermal fluid heater is known in kilowatts, the following formula is used: where Q is the maxi
27、mum continuous rating of the boiler(s), in kilowatts; m, is the total steam capacity (maximum continuous rating) of the boiler(s), in kilograms per second; ps is the fuel consumption, in kilograms of fuel per kilogram of steam, or in kilograms of fuel per second per kilowatt of thermal capacity; NOT
28、E - Where specific data are not available, mf, = 0,077 kgkg may be used for the calculation if the steam capacity is known. if the thermal capacity is known, mf, = 0,ll kg s- kW- may be used. maf is the air requirement for combustion, in kilograms of air per kilogram of fuel; II E NOTE - Where speci
29、fic data are not available, maf = 15,7 kg/kg may be used for calculation. ie u) * p = 1,13 kg/m3 (.e. the density of air, at + 35 OC, 70 YO RH and 101,3 kPa). 5.3 Airflow for evacuation of heat emission The sum of the airflow necessary for heat evacuation, qh, shall be calculated, in cubic metres pe
30、r second, as follows: where is the heat emission from main propulsion diesel engine(s), in kilowatts (see 6.1); GdP is the heat emission from diesel generator engine(s), in kilowatts (see 6.2); dg Gb is the heat emission from boilers and thermal fluid heaters, in kilowatts (see 6.3); QP is the heat
31、emission from steam and condensate pipes, in kilowatts (see 6.4); 5 STD.BSI ES EN IS0 88b3-ENGL 3998 m Lb24bb 0730895 233 m EN IS0 8861:1998 is the heat emission from electrical air-cooled generator(s), in kilowatts (see 6.5); #5l is the heat emission from electrical installations, in kilowatts (see
32、 6.6); #ep is the heat emission from exhaust pipes including exhaust gas-fired boilers, in kilowatts (see 6.7); #t is the heat emission from hot tanks, in kilowatts (see 6.8); is the heat emission from other components, in kilowatts (see 6.9); is the airflow for main propulsion diesel engine combust
33、ion, in cubic metres per second (see 5.2.2); QdP is the airflow for diesel generator engine combustion, in cubic metres per second (see 5.2.3); qds qb is the airflow for boiler combustion, in cubic metres per second (see 5.2.4); p = 1,13 kg/m3 (.e. the density of air, at + 35 OC, 70 % RH and 101,3 k
34、Pa); c = 1 ,O1 kJ/(kg.K) (the specific heat capacity of the air); AT= 12,5 K (the increase of the air temperature in the engine room .e. the difference between inlet and outlet temperature measured at design conditions. The outlet temperature shall be measured at the outlet from engine room to casin
35、g or funnel without heat-sensitive installations). The factor 0,4 is based on the usual arrangements of engine room and ventilation ducts. In a case of special arrangements, the value of the factor should be considered. 6 Calculation of heat emission 6.1 Heat emission from main propulsion diesel eng
36、ine) The heat emission from main propulsion diesel engine(s), dp, shall be taken, in kilowatts, as follows: where Pdp is the service standard power of the main propulsion diesel engine(s) at maximum continuous rating, in kilowatts; Ahd is the heat loss from the diesel engine(s), in percentage. 6 EN
37、IS0 8861:1998 NOTE - Where specific data are not available, pds Stand-by units are not to be included. Ahd is the heat loss from the diesel engine(s), in percentage. NOTE - Where specific data are not available, mfc is the fuel consumption, in kilograms of fuel per kilogram of steam; NOTE - Where sp
38、ecific data are not available, q, = 0,077 kg/kg may be used for calculation. 7 STD-BSI BS EN IS0 B8b3-ENGL 3998 W 3b24bb O730897 0b EN IS0 8861:1998 h is the lower calorific value of the fuel, in kilojoules per kilogram; NOTE - Where specific data are not available, h = 40,200 kJ/kg may be used for
39、calculation. Ab is the heat loss, in percentage, at the maximum continuous rating of the boiler or thermal fluid heater; NOTE - Where specific data are not available, data according to 7.2 may be used for calculation. Bi is a constant that applies to the location of the boiler(s) and other heat exch
40、angers in the engine room (refer to text in 6.7 for value of BI); Q is the maximum continuous rating of the thermal fluid heater or boiler in kilowatts. 6.4 Heat emission from steam and condensate pipes The heat emission from steam and condensate pipes, $p, shall be calculated, in kilowatts, as foll
41、ows: where m, is the total steam consumption, in kilowatts (1 kW - 1,6 kg/h of steam); Ahp is the heat loss from steam and condensate pipes, in percentage of the steam consumption in kilowatts. NOTE - Where specific data are not available, Ahp = 0,2 % may be used for calculation. 6.5 Heat emission f
42、rom electrical generator($) The heat emission from air-cooled generator(s), #g, shall be calculated, in kilowatts, as follows: where Pg is the power of installed air-cooled generator(s), in kilowatts (stand-by sets shall be ignored); q is the generator efficiency, in percentage. NOTE - Where specifi
43、c data are not available, q = 94 % may be used for calculation. 8 EN IS0 8861:1998 6.6 Heat emission from electrical installations The heat emission from electrical installations, or b) for conventional ships where full details of the electrical installations are not known, the heat emission is take
44、n as 20 % of the rated power of the electrical apparatus and lighting that are in use at sea. 6.7 Heat emission from exhaust pipes and exhaust gas-fired boiler(s) The heat emission from exhaust pipes and exhaust gas-fired boiler(s) may be determined from the curves in 7.3, in kilowatts per metre of
45、pipe. If specific figures are not available, At= 250 K may be used for 2-stroke engines and At = 320 K for 4-stroke engines. Exhaust gas pipes and exhaust gas-fired boiler(s) situated in the casing and funnel shall not be taken into account. If a case of exhaust gas boiler(s) placed directly below e
46、xposed casing exists, the same factor BI = 0,l as in 6.3 is to be used. 6.8 Heat emission from hot tanks The heat emission from hot tanks, 6, in kilowatts, shall be based on the sum of the hot tank surfaces contiguous with the engine room, using the values given in table 1. Table 1 - Heat emission f
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