Page 482 - Handbook of Electrical Engineering

PREPARING EQUIPMENT SPECIFICATIONS 471

• Spare parts.
• Documentation.
• Packing and transportation.
• Appendices, if necessary.

19.2.1 Introduction

In this introductory section there should be a brief description of where the equipment is to be
located, what type of installations will use the equipment and whether the environment is hazardous
or non-hazardous (or both).

19.2.2 Scope of Supply

A summary listing should indicate all the main components that constitute the equipment, e.g.
AC generator, coupling, exciters, AVR, terminal boxes, lubrication system, stator cooling system,
heat exchangers.

Where appropriate it is prudent to describe or list what is not included in the scope of supply.
This will minimise misunderstandings at a later stage when quotations are being compared, e.g. for
the above example, gearbox, prime mover, base frame or skid assembly.

19.2.3 Service and Environmental Conditions

Here should be explained the range of environmental (ambient) temperatures, humidity, winds, and
available cooling water conditions. The design ambient temperature should be stated. The type of
weather throughout the year may have an influence on the design of the equipment, e.g. dust-laden
wind, heavy storms, corrosive rain, air contaminated with chemicals. Outdoor and indoor conditions
should be described if appropriate.

19.2.4 Compliant International Standards

A list of only the most appropriate international standards should be included. The title, identification
number and latest revision number should be given. If too many standards for the type of equipment
are listed, then much confusion can arise at a later date when the quality assurance checks are made.
Some standards have similar titles but have subtle differences and applications. (Mixing European
and US standards can give rise to misinterpretations of their definitions and suitability as they are not
necessarily identically equivalent to each other, such as in the case with some BSI and IEC standards
that meet the CENELEC harmonisation norms.)

19.2.5 Definition of Technical and Non-technical Terms

When it is proposed to issue an enquiry for the purchase of equipment on an international basis, it
should be borne in mind that the interpretation of words and phrases, which may not be in regular use