A good standard must specify all the details that may result in conflicts between vendors and purchasers,
thus avoiding ambiguous terms such as good engineering practice, usual practice, etc. Frequently, different
standards development organizations produce sector-based standards that respond to the particular requirements
of a specific type of industry. For example, the American Petroleum Institute (API) is an association
that normally develops standards for the severe service conditions of the oil-processing industry. Often the
quality requirements for this industry are not necessary in other applications, and other standards development
organizations such as the Tubular Exchan ger Manufacturers Association (TEMA) or the American
National Standards Institute (ANSI) may have different standards for the same type of product. The engineer
has to choose the standard that best adapts to the particular requirements of the project. The adoption
of an unnecessarily stringent standard will increase the cost of the project without any benefit.