Iranian Classification Society Rules
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Section 7 Couplings between Rudder Stocks and Main Pieces
701. Horizontal flange couplings
1. Coupling bolts are to be reamer bolts.
2. Couplings are to comply with the requirements in Table 4.1.5.
Parameter | Requirement |
| 6 |
|
|
|
|
| 0.67 |
: total number of bolts. : bolt diameter (mm ). : stock diameter (mm ), the greater of the diameters or according to 501. and 502. (mm ). : mean distance (mm ) of the bolt axes from the centre of the bolt system. : material factor for the rudder stock as given in 102. : material factor for the bolts as given in 102. : material factor for the coupling flange as given in 102. : the thickness (mm ) of the coupling flanges. : the width (mm ) of the material outside the bolt holes of the coupling flanges. | |
NOTE: (1) In way horizontal flange couplings, are to be calculated from and determined by a num- ber of bolts not exceeding 8. | |
Table 4.1.5 The Minimum Requirements for Horizontal Flange Couplings
(not less than 0.9
702. Cone couplings
1. Cone couplings without hydraulic arrangements (oil injection and hydraulic and dismounting the coupling are to comply with the following :
nut, etc.) for mounting
(1) The couplings are to have a taper on diameters of 1:8 ~ 1:12 and be secured by the slugging nut (refer to Fig 4.1.3).
(2) The taper length of rudder stocks fitted into the rudder plate is generally not to be less than
1.5 times the rudder stock diameter at the top of the rudder.
(4) The dimensions of the slugging nut as specified in (1) above are to be as follows, (refer to Fig
4.1.3).
≥
mm
≥ , whichever is
:
:
:
(5) The nuts
external thread diameter (mm ). length of nut (mm ).
outer diameter of nut (mm ).
fixing the rudder stocks must have efficient locking devices such as lock nut, nut
stopper, etc. (refer to Fig 4.1.3).
(6) Couplings of rudder stocks are to be properly protected from corrosion.
Fig 4.1.4 Cone Coupling with Hydraulic Arrangement
Fig 4.1.3 Cone Coupling without Hydraulic Arrangement
2. Cone couplings with hydraulic arrangements (oil injection and hydraulic nut, etc.) for mounting and dismounting the coupling are to comply with the following :
(1) Couplings are to have a taper on diameters of 1:12 ~ 1:20. The push-up force and push-up length are to be at the discretion of the Society.
(2) Nuts fixing the rudder stocks must have efficient locking devices. However, a plate for securing
the nut against the rudder body is not to be provided.
(3) Couplings of rudder stocks are to be protected from corrosion.
(4) The dimensions of the securing nuts are to be as specified in Par 1 (4).