Iranian Classification Society Rules

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Section 1 General


101. Application


1. In application to Ch 3, Sec 101, 1 of the Rules, it shall be complied with the requirement of Pt 5, Ch 3, 203 and 204 of Rules for the Classification of Steel Ships.

(1) Intermediate shaft and thrust shaft

(A) The diameter of intermediate shaft and thrust shaft shall be not less than




mm


: according to Pt 5, Ch 3, 203 of Rules for the Classification of

Steel Ships.

(B) For ship restricted in coastal service, it may be reduced to 95 % of values calculated by (a) above.

(2) Propeller shaft and stern tube shaft water corrosion shall be not less than


mm


: according to Pt 5, Ch 3, 203 and 204 of Rules for the Classification

of Steel Ships




: specified minimum tensile strength (N mm ) of proposed material. For the

(B) For propeller shaft and stern tube shaft with corrosion-resistant materials or without effective

protection against seawater corrosion it shall be applied to Pt

for the Classification of Steel Ships.

5, Ch 3, 204 of Guidance

(C) For a ship of 25 m in length and belows, the following formula shall be complied with


mm


: according

to Pt 5, Ch 3, 204 of Rules for the Classification of Steel


: factor concerning material of shaft is to be complied with the requirement given in Table 5.3.1 of the Guidance

(D) For a ship restricted in coastal service, it may be reduced to 95 % of values calculated by

(A) or (B) above. image

image


Table 5.3.1 Factor

image

Concerning Material of Shaft


Shaft material

Specified minimum yield strength (N mm )

Specified minimum tensile strength (N mm )



Material


Chemical composition (%)


Application 1


Application 2 (2)


Stern tube shaft

Carbon steels or Manganese steels

Carbon


According

Ch 1.


to


Pt


2,


200


400


126


114


114

Authentic-stainless steels (KS STS 316 series)


175


470


91


81


81


Martensitic-stainless


C :


0.20 max


675


850


88


80


80

Si :

0.80

steels

Mn :

1.0

(KS STS 431 series)

Ni :

2.0-3.0

Cr :

15.0-18.0

Duplex stainless steels

(3)

470

660

63

57

57


Manganese bronze copper


Cu :

Pb :

Mn :

Fe :

Zn :


52-62

0.5 max

2.0 max

1.20 max remains


245


510


92


84


84


Nikel - Aluminum bronze copper


Ni :


4.0-6.0


390


740


85


77


77

Al :

Fe :

Nn :

7.0-11.0

2.0-6.0

2.0 max

Cu :

remains


Nikel-copper alloy


Ni :

Fe :

Mn :

C :

Cu :


63-68

3.0 max

2.0 max

0.30 max remains


350


550


85


77


77


Nikel-copper alloy


Ni :


63-70


690


960


71


64


64

Al :

2.0-4.0

Fe :

Mn :

2.0 max

1.5 max

C :

1.25 max

Cu :

remains


(NOTES)

(1) For application 1 and 2, it is to be referred to the requirement of Table 5.3.1 of the Guidance.

(2) For stern tube sealing devices at the forward side, from the forward end to intermediate shaft coupling it may be reduced to the required diameter of the intermediate shaft.

(3) For the composition and characteristics, it is to be complied with the requirement recognized by the Society.