314 Calculo Del Foam Para Un Chemical Tanker

7/25/2019 314 Calculo Del Foam Para Un Chemical Tanker.

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MSC/Circ.314

29 May 1981

CODE FOR THE CONSTRUCTION AND EQUIPMENT OF SHIPS CARRYIN

DANEROUS CHEMICA!S IN "U!#

Ca$c%$a&i'( ') &*+ ca,aci&y ') )'a- y&+- )'r c*+-ica$ &a(+r

1 In section 3.14 of the Bulk Chemical Code concerning fire extinguishingarrangements for cargo tank areas (ninth set of amendments) the foam supply has to

be determined in accordance ith 3.14.! to 3.14." of the Bulk Chemical Code. In orderto pro#ide for a correct interpretation of the re$uirements the %ub&Committee on 'ire

rotection agreed on the folloing example for a calculation of foam system for achemical tanker of 1* tonnes deadeight.

+ ,he -aritime %afety Committee at its forty&fourth session agreed that thisexample be folloed hen calculating the capacity of foam systems for chemical

tankers. In addition this example ill be included in the ne edition of the Bulk

Chemical Code.

E0a-,$+ ') )'a- y&+- ca$c%$a&i'( )'r c*+-ica$ &a(+r ') 1 & S*i,,ar&ic%$ar

& Beam 14.! m

& /ength of cargo area !0 m

& /ength of largest cargo tank m

& Cargo deck area 14.!m 2 !0m 1+ m+

& ori5ontal sectional area of single largest tank 14.! m 2 m 13.!m+

(6ote7 for the purposes of this illustration* a single tank encompasses the entire beam of theship)

& roposed monitor spacing m

& 8rea protected by largest monitor m x 14.!m 13.! m+

Ca$c%$a&i'(

1 D+&+r-i(a&i'( ') )'a- %,,$y ra&+5

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3.14.! 1 & ,he largest of7

999999991 aragraphs refer to 1 edition of the Bulk Chemical Code.

3.14.!(a) & the foam supply rate based upon the entire cargo deck area.

+ l:m+ :min 2 1+ m+ 1*0+4 l:min

3.14.!(b) & the foam supply rate based upon the hori5ontal sectional area of the single largesttank

+ l: m+ :min 2 13.! m+ +*01 l:min

3.14.!(c) & the foam supply rate based upon the area protected by the largest monitor

1 l: m+ :min 2 13.! m+ ;1*3! l:min

9999999

; shall not be less than 1*+! l:min

,he foam supply rate is therefore +*01 l:min hich is the largest of the three abo#ecalculated rates.

2 D+&+r-i(a&i'( ') &*+ r+6%ir+ 6%a(&i&y ') )'a- c'(c+(&ra&+5

3.14.0 & +*01 l:min is the foam supply rate from <egulation 3.14.!. ,his flo rate for thirtyminutes ill re$uire 3 min 2 +*01 l:min "*3 litres of foam&ater solution. If a

!= foam concentrate is used* then != of the "*3litres must be foam concentrate*or .! 2 "*3 3*1! litres.

3 D+&+r-i(a&i'( ') &*+ -i(i-%- -'(i&'r ca,aci&y5

3.14." & >ach monitor must supply at least7

(a) != of the re$uired foam rate? or

(b) 1 l: m+ :min for the area it protects? or

(c) 1*+! literes:min* hiche#er is greater

!= of the foam supply rate +*01 l:min 2 .! 1*3! l:min

1l: m+ :min times the area the monitor protects 13.! m+ 2 1l: m+ :min 1*3!l:min

,he minimum monitor capacity is therefore 1*3! l:min.

D+i7(+r i*+ &' i(cr+a+ -'(i&'r ,aci(7 &' 1 -+&r+ +&++( -'(i&'r.

1 Recalculate required foam supply:

3.14.!(a) & same as before & 1*0+4 l:min

3.14.!(b) & same as before & +*01 l:min

3.14.!(c) & larger area co#ered by monitor is 1! m 2 14.! +1".! m+

1l: m+ :min 2 +1".! m+ +*1"! l:min

,he re$uired foam rate therefore remains +*01 litres per minute

2 Recalculate required foam concentrate supply:





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314 Calculo Del Foam Para Un Chemical Tanker