API STD 676 2009 pdf free download
API STD 676 2009 pdf free download.Positive Displacement Pumps—Rotary.
1 Scope This standard covers the minimum requirements for rotary positive displacement process pumps and pump units for use in the petroleum, petrochemical, and gas industry services. Controlled-volume pumps, hydraulically driven pumps and positive displacement reciprocating pumps are not included (see API 674 for positive displacement reciprocating pumps and API 675 for controlled-volume pumps). For rotary positive displacement pumps in auxiliary services (e.g. lube oil systems), manufacturer’s standard with demonstrated experience is acceptable. Annex A contains datasheets which purchasers are encouraged to use (informative). Annex B provides guidance for factors affecting twin screw efficiencies (informative). Annex C contains an inspector’s checklist (informative). Annex D contains forms which may be used to indicate vendor drawing and data requirements (VDDRs) (informative). Annex E gives guidance regarding net positive suction head (NPSH) vs net positive inlet pressure (NPIP) (informative). Annex F gives guidance on pulsation and vibration control techniques (informative). Annex G provides a typical piping and instrumentation diagram for multiphase pump (MPP) skids (informative). This standard requires the purchaser to specify certain details and features. A bullet ( ) at the beginning of a paragraph indicates that either a decision by, or further information from, the purchaser is required. Further information should be shown on the datasheets (see example in Annex A) or stated in the quotation request and purchase order. 2 Normative References 2.1 The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
3.6 certified material test report CMTR Certified report documenting the actual chemical composition and/or physical properties of critical materials. 3.7 datum elevation Elevation to which values of NPSH are referred (concrete foundation or steel structure to which the baseplate is attached); also see paragraph defining NPSH (see 3.38). 3.8 depressurization valve Valve, external to the MPP, used to relieve the gas pressure within the MPP package to a blow-down system or flare. NOTE Also known as a blow-down valve. 3.9 design Manufacturer’s calculated parameter. NOTE A term used by the equipment manufacturer to describe various parameters such as design power, design pressure, design temperature, or design speed. It is not intended for the purchaser to use this term. 3.10 differential pressure Change in energy of the pumped liquid due to its pressure change in the pump. Typically, the discharge pressure minus the suction pressure. 3.11 discharge pressure Energy of the pumped liquid due to its pressure as measured immediately downstream of the pump discharge flange. 3.12 displacement Volume transferred from the suction to discharge per revolution of the rotor(s). In pumps incorporating two or more rotors operating at different speeds, the displacement is the volume transferred per revolution of the driving rotor. Displacement depends only on the physical dimensions of the pumping elements. 3.13 drive train components Item of the equipment used in series to drive the pump (e.g. motor, gear, turbine, engine, fluid drive, clutch). 3.14 fail safe System which will cause the equipment to revert to a permanently safe condition (shutdown and/or depressurized) in the event of a component failure or failure of the energy supply to the system. 3.15 flammable liquid Liquid that has a closed-cup flash point below 38 °C (100 °F), as determined by recommended test procedures and apparatus. NOTE Suitable test procedures are those set forth in NFPA 3.
3.17 gas oil ratio GOR Ratio of gas in a well stream expressed in standard cubic meters of gas per cubic meter of oil, Nm 3 /m 3 in SI units or standard cubic feet of gas per barrel of oil, ft 3 /bbl in USC units. 3.18 gas volume fraction GVF Ratio of volume of gas to that of the total volume of the fluid (oil, water, and gas) at pump suction temperature and pressure, the fraction being expressed as a percentage. 3.19 gauge board Bracket or plate used to support and display gauges, switches, and other instruments. NOTE A gauge board is open and not enclosed. 3.20 hold-down bolt mounting bolt Bolt holding the equipment to the baseplate. 3.21 hydrostatic test pressure Static test pressure used for leak testing. NOTE Depending upon pump type, areas or regions of the pump subject to suction pressure may be hydrotested at a lower pressure than regions subject to discharge pressure. 3.22 inspection and test plan ITP Single project-specific document used with extended scope for heavy duty pumps in complex packages to consolidate all inspection and test elements, the criteria required to be met, and the roles and responsibilities. 3.23 local Position of devices mounted on or near the equipment or console.
