API610MajorChangesfrom5ththrough8thEditions.docVIP

API 610 Major Changes from 5th through 10th Editions Item 5th Ed 6th Ed 7th Ed 8th Ed 9th/10th Edition * Pump Types No limitation on pump types Close coupled, two stage overhung or double suction overhung pumps require purchaser approval ? Close coupled, two stage overhung or double suction overhung and ring section single casing pumps require purchaser approval. ? In-line pump specified is rigid coupled type. ? Rigid coupled in-lines, horizontal foot mounted overhung, and built in mechanical seal pumps added to list requiring customer approval. ? In-line pump must be bearing frame type unless specified by the purchaser. Foot mounted design now allowed, if approved by customer, if service temp. is 150 deg. C (300 deg. F). Casing design pressure Design for max. discharge pressure for service Design for max. discharge pressure plus allowances for head and speed increase Design for max. discharge pressure plus allowances for head and speed increase Design pressure no less than 600 psig No change. Flanges Pressure class not specified Pressure class not specified Pressure class not specified 300 RF minimum implied (based on 600 psig casing design pressure) No change. Casing joints Externally confined gaskets Metal to metal joint with confined controlled compression gasket Metal to metal joint with confined controlled compression gasket Metal to metal joint with confined controlled compression gasket No change. Bolting Type of bolting not specified Studs and nuts preferred to cap screws Stud and nuts preferred to cap screws Studs and nuts required. Cap screws require purchase approval No change. Casing mount Centerline mount for T350oF Centerline mount for T350oF Centerline mount for T350oF ? Casing mount (with baseplate) must be sufficiently rigid to limit coupling end shaft displacement to levels permitted by API 610. A bearing housing support (frame foot) cannot be used. Centerline mounting required for horizontal overhung pumps. ? Casing mount (with baseplate)