Rope Stiffness

Rope Stiffness

Definition(s)

Rope Stiffness

rope modulus The ratio of rope stress to strain/the ratio of rope tension to elongation.
  • NOTE: Stiffness is often preferred as it is difficult to determine the area for a synthetic rope. Often the terms
  • dynamic modulus/stiffness and static modulus/stiffness are used. Dynamic refers to modulus/stiffness values
  • obtained when the rope is loaded quickly (seconds to minutes) where static refers to modulus/stiffness values
  • obtained when the rope is loaded slowly (hours to days).
Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global Standards
Rope Production Report

Rope Production Report

Definition(s)

Rope Production Report

A document which completely describes the rope product, including rope design, termination design, and assembly length, and which includes the material certificates, material test results, and the various checklists. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global Standards
Rope Design Specification

Rope Design Specification

Definition(s)

Rope Design Specification

A document which completely describes the design of the rope, including the numbers and arrangements of strands, the strand pitch, the material chemical composition, and the manufacturing method. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global Standards
Rope Construction

Rope Construction

Definition(s)

Rope Construction

The manner in which the fibers, yarns, and strands are assembled together in making the rope. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global Standards
Rope Assembly Interface

Rope Assembly Interface

Definition(s)

Rope Assembly Interface

The physical connection which is part of the end of the rope assembly and is used to interconnect rope assemblies or to connect a rope assembly to another tension member (e.g. a wire rope or chain) or to hardware (e.g. an anchor, a buoy, or a platform). Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global Standards
Rope Assembly Length

Rope Assembly Length

Definition(s)

Rope Assembly Length

The distance between the assembly interface points (as defined in the specification or purchase order) as measured at a defined tension and by a method agreed to by the purchaser and the manufacturer. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global Standards
Rope Assembly

Rope Assembly

Definition(s)

Rope Assembly

The rope, its terminations, and any other accessory gear, as described in the purchaser's specification or order. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global Standards
RBS

RBS

Definition(s)

RBS

Reference break strength. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global Standards

RBS

The reference break strength for sample under test.
  • NOTE: 1 For a full rope assembly, RBS is the catalog break strength of the rope.
  • NOTE: 2 For a subrope, RBS is the break strength of the subrope estimated by the manufacturer.
  • NOTE: 3 For a scaled rope, RBS is the break strength of the scaled rope assembly estimated by the manufacturer.
Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global Standards
Reference Break Strength

Reference Break Strength

Definition(s)

Reference Break Strength

The reference break strength for sample under test.
  • NOTE: 1 For a full rope assembly, RBS is the catalog break strength of the rope.
  • NOTE: 2 For a subrope, RBS is the break strength of the subrope estimated by the manufacturer
  • NOTE: 3 For a scaled rope, RBS is the break strength of the scaled rope assembly estimated by the manufacturer.
Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global Standards
Quality Control Report

Quality Control Report

Definition(s)

Quality Control Report

A document prepared at the completion of a designated step of the rope making and assembly process, which includes the completed quality control checklists, material certificates, and inspection reports. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global Standards
Quality Control Checklist

Quality Control Checklist

Definition(s)

Quality Control Checklist

A document which lists the important parameters in setting up and accomplishing a designated step of the rope making and assembly process, including normal values and tolerances. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global Standards
Quality Assurance Supervisor

Quality Assurance Supervisor

Definition(s)

Quality Assurance Supervisor

An employee of the manufacturer who is responsible for ensuring the manufacturer adheres to quality assurance procedures. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global Standards
Quality Assurance Manual

Quality Assurance Manual

Definition(s)

Quality Assurance Manual

A document which completely describes the manufacturer's quality control and assurance program. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global Standards
Production Rope

Production Rope

Definition(s)

Production Rope

The rope produced for the offshore mooring system order.
  • NOTE: Also, a rope sample removed from production or selected after production for the purpose of testing.
Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global Standards
Potted Socket

Potted Socket

Definition(s)

Potted Socket

A termination generally consisting of a tapered socket into which the rope is inserted with separatedstrands and broomed out yarns and then secured by pouring of a liquid, setting resin or similar compound. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global Standards
Material Chemical Composition

Material Chemical Composition

Definition(s)

Material Chemical Composition

The generic designation of a specific chemical composition and process of material used in the fiber.
  • EXAMPLE Nylon, polyester, aramid, or high modulus polyethylene.
Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global Standards
Material Certificate

Material Certificate

Definition(s)

Material Certificate

A document prepared by the manufacturer and the fiber producer certifying the type and grade of fiber material, the properties of the yarn, and that the material used in rope production is that which is specified in the rope design specification. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global Standards
Material Specification

Material Specification

Definition(s)

Material Specification

A document which completely describes the fiber material used in the rope, including the material chemical composition, the fiber producer, the fiber type and grade, and the yarn test properties. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global Standards
Manufacturing Specification

Manufacturing Specification

Definition(s)

Manufacturing Specification

A document which completely describes the process of making the rope, including instructions for each step of the manufacturing process. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global Standards
Lay Length

Lay Length

Definition(s)

Lay Length

The length along the axis of a rope in which a strand makes one complete spiral around the rope axis. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global Standards
Jacket

Jacket

Definition(s)

Jacket

A braided or plastic covering which is placed over the rope (or over individual strands) for protection and to hold the rope structure together. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global Standards
Insert

Insert

Definition(s)

Insert

A short length of rope which can be installed in the mooring line for the purpose of extraction for testing and/or monitoring. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global Standards
Installation Stretch

Installation Stretch

Definition(s)

Installation Stretch

The increase in length in the synthetic rope due to the application of the installation load is defined as the installation stretch. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards

Installation Stretch

The permanent increase in length introduced after application of the installation loads. Installation stretch is the construction stretch due to the installation tension. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global Standards
Fiber Type

Fiber Type

Definition(s)

Fiber Type

A designation given by the fiber producer, which indicates the manner in which a particular fiber has been drawn or spun, processed, and treated with various finishes and oils. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global Standards
Fiber Grade

Fiber Grade

Definition(s)

Fiber Grade

A designation of the quality of a particular fiber, indicating the adherence of tolerances on properties.

Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards

Fiber Grade

Marine finish. A designation of the quality of a particular fiber, indicating the adherence of tolerances on properties. Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global Standards
Yarn Producer

Yarn Producer

Definition(s)

Yarn Producer

The entity which produces the fiber and/or yarn and applies special processes to that yarn before it is received by the rope manufacturer. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global Standards
Fiber Producer

Fiber Producer

Definition(s)

Fiber Producer

The entity which produces the fiber and/or yarn and applies special processes to that yarn before it is received by the rope manufacturer. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global Standards
Delayed Elastic Stretch

Delayed Elastic Stretch

Definition(s)

Delayed Elastic Stretch

Rope increase in length as a function of time after the rope is loaded from a previously lower load, excluding elastic stretch and permanent elongation. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global Standards
Delayed Elastic Recovery

Delayed Elastic Recovery

Definition(s)

Delayed Elastic Recovery

Rope reduction in length as a function of time after the rope is unloaded from a previously higher load, excluding elastic stretch and permanent elongation. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global Standards
Creep-log Time Plot

Creep-log Time Plot

Definition(s)

Creep-log Time Plot

A graph of creep (ordinate) against the log of time under tension (abscissa). Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global Standards