Overview
IEC TR 61366-2:1998 is a Technical Report (IEC TR, type 3) that provides practical guidelines for preparing technical specifications and tendering documents for Francis turbines. Published by the IEC Technical Committee 4, it is part of a series (IEC 61366-1 to -7) covering tendering documents for hydraulic turbines, pump-turbines and storage pumps. The report is intended to assist Employers, Contractors and tender evaluators in drafting clear, project‑specific tender requirements and in evaluating bids for hydraulic machines.
Key Topics
The report organizes technical requirements and supporting material into concise sections to be included in Tendering Documents. Major topics include:
- Scope of work, limits of contract and supply by Employer - defining responsibilities between buyer and supplier.
- Design conditions and technical performance guarantees - parameters to base turbine design and contractual guarantees upon.
- Mechanical design criteria, materials and construction - guidance on construction, corrosion protection and materials selection.
- Components specifications - fixed/embedded parts (spiral case, stay ring, draft tube), stationary/removable parts (guide vanes, headcover), and rotating parts (runner, main shaft, bearings, seals).
- Guide vane regulating apparatus - servomotors, linkages, overload protection and locking devices.
- Auxiliary systems and instrumentation - lubrication, pressure balancing, air admission, controls, indication and protection.
- Testing and acceptance - shop inspection, model acceptance tests, installation, commissioning and field acceptance tests (including cavitation assessment).
- Spare parts, special tools and documentation - required deliverables, drawings and operational manuals.
(The report also references related IEC publications for terminology and symbols such as IEC 60050 and IEC 60027.)
Applications
IEC TR 61366-2 is used by:
- Project owners and Employers to prepare unambiguous technical specifications and contractual tender packages for Francis turbine procurements.
- Turbine manufacturers and Contractors to ensure proposals meet expected scope, design criteria and test requirements.
- Consultants and engineering firms for writing procurement documents and evaluating technical compliance of tenders.
- Testing laboratories and site commissioning teams as a checklist for model tests, shop tests, installation checks and field acceptance.
Practical benefits include improved tender clarity, more consistent bid evaluation, reduced contractual disputes and better alignment of design, testing and acceptance criteria.
Related Standards
- IEC 61366-1 (General and annexes) - use together with Part 2 for a complete Tendering Document.
- IEC 61366-3 to IEC 61366-7 - companion parts covering Pelton, Kaplan/propeller, tubular turbines, pump-turbines and storage pumps.
- IEC 60050, IEC 60027, IEC 60417 - referenced for terminology and symbols.