Standards are an extremely important part of the industrial and commercial environment. By specifying products that comply with the standards, companies can be confident that the products they purchase will meet important performance and safety requirements, even if they come from companies the company has never worked with before. Standards also ensure that even products manufactured by different suppliers will have the same basic features.
Given that standards are so useful, it is not surprising that there are many, including standards set by “industry standards” trade associations (e.g., NEMA for electrical equipment or API for petroleum). This article will focus on a comparison of two important sets of standards for industrial pumps: ANSI B73.1 and ISO 5199.
Historical development
The American National Standards Institute (ANSI) is a private, nonprofit membership organization founded in 1918 as a joint venture by engineering organizations such as IEEE, ASME, and ASCE, and various U.S. government agencies. There are currently more than 10,000 American National Standards (ANS) covering a wide range of products and processes.
ISO's roots date back to 1946, when delegates from 25 countries met in London to discuss the future of international standards that could bridge many national and sector-specific standards. There are now more than 19,500 international standards covering many aspects of technology and business.
Historically, ISO standards have been more dominant in Europe and Asia, while ANSI standards are much more widely used in the United States and other parts of the Americas. However, recently, both standards have found many common denominators, and with the impact of globalization, ISO standards have become more widespread all over the world.
ANSI B73.1 (Bazen ASME B73.1 olarak anılır.)
This standard was developed to meet the needs of the chemical industry for a family of single-stage end-suction centrifugal pumps. The standard covers 27 pump sizes and specifies a set of basic sizes for each of them. Dimensions include the overall height and length of the bare pump, flange and shaft diameters, size, location and spacing of mounting bolts, etc. Contains. This standard also defines the pump's performance and some design features, as well as service and basic maintenance (e.g. back pull out for replaceable wear rings).
Standardization of dimensions, mounting arrangements and basic layout means that ANSI B73.1 pumps from different manufacturers are easily interchangeable.
ISO 5199 (ve ISO 2858)
These two standards cover the same types of industrial pumps as ANSI B73.1. While the older ISO 2858 focused on external dimensions and assembly details, ISO 5199 also specifies various performance requirements (e.g. minimum bearing life) and construction features (e.g. general layout, seal configurations). In some respects (e.g. maximum allowable vibration levels) ISO 5199 is more stringent than ANSI B73.1.
In general, pumps manufactured to meet the ISO 5199 standard meet or exceed ANSI B73.1 requirements for performance, reliability, serviceability and longevity. However, ISO 5199 pumps cannot be used directly as a direct replacement for ANSI B73.1 machines without some adaptations to the base and couplings. This is because mounting bolt patterns, shaft diameters, and suction/discharge flange locations are different, even for equivalently sized pumps. Because of their respective areas of origin, many ANSI B73.1 pumps are designed to be compatible with 50 Hz electrical services, while ISO 5199 pumps are designed to be connected to 60 Hz asynchronous electric motors. However, most ISO 5199 pump manufacturers have 60 Hz models available.
Many of the ISO-certified products coming out of Europe, and especially Germany, feature impressive new energy-efficient technologies that may not be available in their ANSI counterparts. There's a reason why German-designed products are known for their quality, efficiency and long service life. The energy savings from a European ISO product may be worth the effort.
Source: KSB Global
