Читать книгу Automation of Water Resource Recovery Facilities - Water Environment Federation - Страница 163

It is important to list critical equipment tag numbers and equipment descriptions in a table to provide information and to avoid process errors that can result if incorrect equipment and/or valves are operated. Although the International Society of Automation (ISA) has developed a widely used method for assigning tag numbers (ANSI and ISA, 2009), some utilities prefer to use site-specific tagging methods. However, the method or standard used is less important than the result; that is, every piece of equipment has a unique tag number, thereby avoiding uncertainty. Tag numbers should also be used in process descriptions.