Ships and Marine Technology — Ship's Mooring and Towing Fittings — Shipside Roller Fairleads
1 Scope
This standard specifies the design, size and technical requirements for shipside roller fairleads.
This standard is applicable to the design, manufacture and acceptance of shipside roller fairleads.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 13755 Ships and Marine Technology — Ship's Mooring and Towing Fittings — Steel Rollers
IMO Circular MSC/
Circ.1175 Guidance on Shipboard Towing and Mooring Equipment
3 Terms and Definitions
For the purposes of this document, the following terms and definitions apply.
3.1
safe working load (SWL)
maximum load, in kN, on the rope that should normally be applied in service conditions
4 Classification
4.1 Types
Depending on the construction, roller fairleads shall be classified as the following two types:
— 2-roller type;
— 3-roller type.
4.2 Nominal sizes
The nominal sizes, Dn, of roller fairleads are denoted by reference to the outside diameter of the roller, in millimeters, from a basic series of preferred numbers. The nominal sizes are: 150, 200, 250, 300, 350, 400, 450 and 500.
5 Dimensions
Roller fairleads have dimensions and particulars in accordance with Tables 1 and 2, and Figures 1 and 2.
a) 2-roller type b) 3-roller type
Figure 1 Layout of roller fairleads
Table 1 Dimensions and SWL of roller fairleads
Dimensions in millimeters
Nominal size Dn 2-roller type 3-roller type l1 l2 Pe SWLb
l We l We θa = 90° θa = 20°
kN t kN t
a θ is the relative angle of ropes on the roller fairlead (refer to Annex A).
b The SWL is the maximum applicable rope tension based on 90° (θ = 90°) and 160° (θ = 20°) deflection of rope direction by the roller fairlead.
The SWLs shown in this table are for reference only. These are based on the loadings as mentioned in Annex A.
The “SWL” may be adjusted depending on the actual loading conditions, and the actual marking shall be agreed between the user and the manufacturer.
c P and W are for reference only. The opening size on the shell or bulwark shall be determined considering overhauling space of the roller.
Dimensions in millimeters
Key:
1 — seat;
2 — steel rollers.
H: The height of the roller fairlead shall be determined in accordance with the height of the shipside gutter coaming.
α: The inclination of α° is to be determined in accordance with the rope leading inclination.
Note: The end shape of the fairleads shown in “Detail Y” can be changed as per manufacturer’s standard based on no sharp edges to avoid rope damage.
Foreword II
1 Scope
2 Normative References
3 Terms and Definitions
4 Classification
5 Dimensions
6 Materials
7 Manufacturing and Inspection
8 Marking
Annex A (Informative) Basis for Strength Assessment of Shipside Roller Fairleads
Annex NA (Informative) Marking
Bibliography
Ships and Marine Technology — Ship's Mooring and Towing Fittings — Shipside Roller Fairleads
1 Scope
This standard specifies the design, size and technical requirements for shipside roller fairleads.
This standard is applicable to the design, manufacture and acceptance of shipside roller fairleads.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 13755 Ships and Marine Technology — Ship's Mooring and Towing Fittings — Steel Rollers
IMO Circular MSC/
Circ.1175 Guidance on Shipboard Towing and Mooring Equipment
3 Terms and Definitions
For the purposes of this document, the following terms and definitions apply.
3.1
safe working load (SWL)
maximum load, in kN, on the rope that should normally be applied in service conditions
4 Classification
4.1 Types
Depending on the construction, roller fairleads shall be classified as the following two types:
— 2-roller type;
— 3-roller type.
4.2 Nominal sizes
The nominal sizes, Dn, of roller fairleads are denoted by reference to the outside diameter of the roller, in millimeters, from a basic series of preferred numbers. The nominal sizes are: 150, 200, 250, 300, 350, 400, 450 and 500.
5 Dimensions
Roller fairleads have dimensions and particulars in accordance with Tables 1 and 2, and Figures 1 and 2.
a) 2-roller type b) 3-roller type
Figure 1 Layout of roller fairleads
Table 1 Dimensions and SWL of roller fairleads
Dimensions in millimeters
Nominal size Dn 2-roller type 3-roller type l1 l2 Pe SWLb
l We l We θa = 90° θa = 20°
kN t kN t
a θ is the relative angle of ropes on the roller fairlead (refer to Annex A).
b The SWL is the maximum applicable rope tension based on 90° (θ = 90°) and 160° (θ = 20°) deflection of rope direction by the roller fairlead.
The SWLs shown in this table are for reference only. These are based on the loadings as mentioned in Annex A.
The “SWL” may be adjusted depending on the actual loading conditions, and the actual marking shall be agreed between the user and the manufacturer.
c P and W are for reference only. The opening size on the shell or bulwark shall be determined considering overhauling space of the roller.
Dimensions in millimeters
Key:
1 — seat;
2 — steel rollers.
H: The height of the roller fairlead shall be determined in accordance with the height of the shipside gutter coaming.
α: The inclination of α° is to be determined in accordance with the rope leading inclination.
Note: The end shape of the fairleads shown in “Detail Y” can be changed as per manufacturer’s standard based on no sharp edges to avoid rope damage.
Contents of GB/T 37448-2019
Foreword II
1 Scope
2 Normative References
3 Terms and Definitions
4 Classification
5 Dimensions
6 Materials
7 Manufacturing and Inspection
8 Marking
Annex A (Informative) Basis for Strength Assessment of Shipside Roller Fairleads
Annex NA (Informative) Marking
Bibliography
