Overview
IEC TR 61366-6:1998 - a Technical Report (type 3) from the International Electrotechnical Commission - provides guidance for preparing Tendering Documents and technical specifications specifically for pump‑turbines. It is part of the IEC 61366 series on hydraulic turbines, storage pumps and pump‑turbines and is intended to help Employers, Contractors and Tenderers produce clear, consistent and project‑specific contract specifications and to evaluate tenders for hydraulic machines.
Key facts:
- Title: Hydraulic turbines, storage pumps and pump‑turbines - Tendering Documents - Part 6: Guidelines for technical specifications for pump‑turbines
- Purpose: Assist preparation of Tendering Documents, tender proposals, and tender evaluation
- Document type: Technical Report (informative guidance, state‑of‑the‑art)
Key topics and technical requirements
IEC TR 61366‑6 outlines the typical structure and content of technical specifications for pump‑turbines. Main topics covered include:
- Scope of work and limits of contract - delineating contractor versus employer responsibilities.
- Design conditions - site and hydraulic inputs required for specification.
- Technical performance and guarantees - performance acceptance criteria, cavitation/pitting considerations and other guarantees.
- Mechanical design criteria and materials/construction - expectations for mechanical integrity and corrosion/erosion protection.
- Design documentation - drawings, calculation reports and manufacturing records to be supplied.
- Component‑level specifications for:
- Fixed/embedded components (spiral case, stay ring, draft tube, pit liner)
- Stationary/removable components (headcover, guide vanes)
- Rotating parts, bearings and seals (runner, main shaft, guide bearings, main shaft seals, thrust bearings)
- Guide vane regulating apparatus and actuator requirements (servomotors, linkages, locking and overload protection).
- Auxiliary systems (bearing lubrication, draft tube air admission, tailwater depression where applicable).
- Instrumentation, controls and protection for safe operation and monitoring.
- Testing and acceptance: model acceptance tests, shop tests, site installation and commissioning tests, and field acceptance tests including inspection for cavitation pitting.
- Spare parts, lifting fixtures and special tools requirements.
Practical applications
This report is used to:
- Prepare clear, project‑specific tendering documents and technical specifications for pump‑turbines.
- Standardize bid evaluation criteria and contractual guarantees.
- Define requirements for manufacturing, shop testing, installation, commissioning and field acceptance.
- Support procurement, engineering and project management teams in hydroelectric and pumped‑storage projects.
Who should use it
- Employers / Owners and their procurement teams preparing tenders
- Engineering consultants and spec writers
- Turbine manufacturers and contractors preparing proposals
- Commissioning teams and test laboratories involved in model, shop and field acceptance tests
Related standards
- IEC 61366‑1 (General and annexes) and other parts of the IEC 61366 series (Parts 2–7) covering Francis, Pelton, Kaplan/propeller, tubular turbines and storage pumps - useful for preparing a complete set of Tendering Documents.