Fixed foam fire fighting in tanker explain ?

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For tankers carrying:
1 crude oil or petroleum products having a flash point not exceeding 60 degrees C (closed cup), as determined by an approved flash point apparatus, and a Reid vapour pressure which is below atmospheric or other liquid products having a similar fire hazard, including cargoes in chapter 18 of the IBC Code, having a flashpoint not exceeding 60 degrees C (closed cup) for which a regular foam fire-fighting system is effective (refer to SOLAS regulations II-2/16.1 and 10.8); or
2 petroleum products with a flashpoint exceeding 60 degrees C (closed cup), as determined by an approved flashpoint apparatus (refer to SOLAS 9)regulation II-2/1.6.4); or
3)IBC Code chapter 17 products with a flashpoint exceeding 60 degrees C (closed cup) determined by an approved flashpoint apparatus (refer to paragraph 11.1.3 of the IBC Code and SOLAS regulation II-2/1.6.4),the rate of supply of foam solution shall be not less than the greatest of the following:
- 1 0.6 l/min per square metre of cargo tanks deck area, where cargo tanks deck area means the maximum breadth of the ship multiplied by the total longitudinal extent of the cargo tank spaces
- 2 6 l/min per square metre of the horizontal sectional area of the single tank having the largest such area; or
- 3 3 l/min per square metre of the area protected by the largest monitor, such area being entirely forward of the monitor, but in no case should the output of any monitor be less than 1,250 l/min.
2.2.1.2 For tankers carrying chemical in bulk listed in chapter 17 of the IBC Code having a flashpoint not exceeding 60 degrees C (closed cup), the rate of supply of foam solution shall be as required by the IBC Code.
2.2.1.3 Sufficient foam concentrate shall be supplied to ensure at least 20 minutes of foam generation in tankers fitted with an inert gas installation or 30 minutes of foam generation in tankers not fitted with an inert gas installation or not required to use an inert gas system.
2.3.3 Applicators
2.3.3.1 At least four foam applicators shall be provided on all tankers. The number and disposition of foam main outlets shall be such that foam from at least two applicators can be directed on to any part of the cargo tanks deck area.
in addition 20 mins for tankers with IG and 30 mins without IG