ISO TR 13637-1997 PDF

Full title and description

St ISO TR 13637-1997 — Petroleum and natural gas industries — Mooring of mobile offshore drilling units (MODUs) — Design and analysis. This technical report provides guidance on the design and analytical methods for mooring and stationkeeping of mobile offshore drilling units.

Abstract

This Technical Report describes methodologies used to evaluate and design mooring arrangements for mobile offshore drilling units (MODUs), including considerations of environmental actions (wind, wave, current), mooring line behaviour, limit states and analysis approaches relevant to short-term, site-specific stationkeeping operations. It served as an industry guidance document until it was incorporated into later ISO standards.

General information

• Status: Withdrawn (replaced by later ISO standards).
• Publication date: December 1997 (1997-12).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 75.180.10 (Exploratory, drilling and extraction equipment).
• Edition / version: Edition 1 (1997).
• Number of pages: 107.

Scope

ISO/TR 13637:1997 covers design and analysis practices for mooring systems of mobile offshore drilling units (MODUs). It addresses stationkeeping objectives for temporary or site-specific operations, outlines environmental load considerations (wind, wave, current), discusses mooring component characteristics and provides guidance on analytical approaches for assessing mooring performance and limit-state behaviour. The technical content was later consolidated into ISO 19901-7.

Key topics and requirements

• Overview of mooring and stationkeeping concepts for MODUs.
• Assessment of environmental actions (wind, waves, current) and their application in mooring analysis.
• Mooring-line behaviour, material considerations and component strength requirements.
• Design and analysis methodologies for short-term/mobile mooring systems (spread moorings, single-point arrangements and thruster-assisted configurations).
• Limit-state considerations, operational criteria and safety margins for stationkeeping performance.
• Guidance for site-specific evaluation and selection of mooring arrangements.

Typical use and users

Used by offshore engineers, mooring designers, drilling contractors, naval architects, classification societies and regulatory authorities involved in planning and executing temporary mooring operations for MODUs and other mobile offshore units. It was applied during site assessments, mooring design studies, and risk evaluations for drilling and construction campaigns.

Related standards

The technical content of ISO/TR 13637:1997 was incorporated into and superseded by ISO 19901-7 (Stationkeeping systems for floating offshore structures and mobile offshore units) — initially published in 2005 and updated later. Other related industry documents and recommended practices (e.g., API mooring guidance such as API RP 2SK/related API documents) are also used alongside ISO guidance for mooring design and integrity management.

Keywords

MODU, mobile offshore drilling unit, mooring, stationkeeping, spread mooring, single-point mooring, mooring analysis, limit states, offshore, ISO/TR 13637.

FAQ

Q: What is this standard?

A: ISO/TR 13637:1997 is a technical report titled "Petroleum and natural gas industries — Mooring of mobile offshore drilling units (MODUs) — Design and analysis" that provided guidance on mooring design and analysis for MODUs.

Q: What does it cover?

A: It covers methodologies for evaluating and designing mooring and stationkeeping systems for mobile offshore drilling units, including environmental loading, mooring-line behaviour, component strength and limit-state analysis for site-specific, short-term operations.

Q: Who typically uses it?

A: Offshore/mooring engineers, drilling contractors, naval architects, classification societies and regulatory bodies involved in planning and approving MODU mooring arrangements.

Q: Is it current or superseded?

A: It has been withdrawn and its technical content was superseded by ISO 19901-7 (first issued in 2005 and subsequently updated). Users should consult the later ISO 19901-7 series for current stationkeeping and mooring requirements.

Q: Is it part of a series?

A: ISO/TR 13637 itself is a standalone technical report, but its subject matter was incorporated into the ISO 19901 series (Part 7) addressing stationkeeping systems for floating offshore structures and mobile offshore units.

Q: What are the key keywords?

A: MODU, mooring, stationkeeping, spread mooring, single-point mooring, mooring analysis, limit state, offshore structures, ISO 13637.