IEC TR 61366-1:1998

Overview

IEC TR 61366-1:1998 is an IEC Technical Report (Type 3) that provides structured guidance for the preparation, submission and evaluation of Tendering Documents for hydraulic turbines, storage pumps and pump‑turbines. Published in 1998 as Part 1 of a seven‑part series, it sets out the general arrangement, content and annex material to be used with the machine‑specific parts (Francis, Pelton, Kaplan/propeller, tubular, pump‑turbines and storage pumps).

Key topics

• Scope and purpose: Guidance to assist owners, consultants and manufacturers in preparing consistent tender packages and in evaluating tenders for hydraulic machines.
• Arrangement of Tendering Documents: Recommended table of contents and main sections (tendering requirements, project information, general/special conditions, technical specifications).
• Instructions to Tenderers (ITT): Rules for submission, validity, clarifications, alternative tenders, evaluation and award procedures.
• Technical data sheets & drawings: Formats and expectations for tenderer submissions to enable fair comparison.
• Contractual provisions: General conditions, special conditions, order of precedence, performance bonds, liquidated damages and acceptance procedures.
• Quality and testing: Quality assurance/control requirements, shop and field acceptance tests, model test specifications and guarantees (performance, cavitation pitting, etc.).
• Project information: Scope of work, schedules, delivery point, operation & maintenance and project facilities.
• Annexes and checklists: Practical tools included (sample TOC for Francis turbines, evaluation factors, tender checklists, example technical data sheets, test and erosion guidance).

Practical applications

IEC TR 61366-1 is practical for:

• Owners and utilities preparing tender packages for hydroelectric projects.
• Consulting engineers who draft technical specifications and evaluate bids.
• Manufacturers and contractors responding to tenders - to ensure compliant proposals.
• Procurement and contract managers assessing bids, bonds and performance guarantees.
• Test laboratories and field teams using the guidance for shop and site acceptance testing.

Using this report helps standardize tendering practice, reduce ambiguity in technical and commercial requirements, and provide objective criteria for tender evaluation and contract award.

Related standards

• Series: IEC 61366‑2 to IEC 61366‑7 (machine‑specific technical specifications).
• Reference vocabularies and symbols: IEC 60050 (IEV), IEC 60027, IEC 60417, IEC 60617.

Keywords: IEC TR 61366-1, hydraulic turbines, tendering documents, pump-turbines, storage pumps, technical specifications, tender evaluation, model tests, performance guarantees.