┌───────────────────────────────┐ │ API 610 Pump Types │ └───────────────┬───────────────┘ │ ┌────────────────────────┼────────────────────────┐ ▼ ▼ ▼ ┌─────────────────┐ ┌─────────────────┐ ┌─────────────────┐ │ Overhung (OH) │ │ Between Bear- │ │ Vertically Sus- │ │ Pumps │ │ ings (BB) │ │ pended (VS) │ └─────────────────┘ └─────────────────┘ └─────────────────┘ Overhung Pumps (OH Series)
: To prevent "dead-heading" (where one pump pushes another back to shut-off), pumps with discharge nozzles larger than 3 inches (80 mm) must now have head values within 3% of each other when operating in parallel.
In between-bearings pumps, the impeller(s) are mounted on a shaft supported by bearings at both ends. This design is inherently more stable at high pressures and flow rates. api 610 12th edition pdf
The 12th edition streamlines materials to ensure durability:
The standard ensures that pumps operate safely for a minimum service life of 20 years, with at least 3 years of uninterrupted continuous operation. Over successive editions, the standard has increasingly integrated advanced computational fluid dynamics (CFD) and rigorous vibration analysis to prevent catastrophic mechanical seals and bearing failures. The 12th edition streamlines materials to ensure durability:
Double-casing, radially split multistage pumps (commonly called barrel pumps). These are reserved for the highest pressure and temperature duties, such as hydrocracker feeds. Vertically Suspended Pumps (VS Series)
The 12th Edition introduces numerous changes that affect everything from nomenclature to service life expectations. The following sections highlight the most important updates. These are reserved for the highest pressure and
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In overhung pumps, the impeller is mounted on the end of a shaft supported by bearings on only one side.
Understanding API 610 12th Edition: The Standard for Petroleum, Petrochemical, and Natural Gas Industries Centrifugal Pumps