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API STD 618-2010 pdf free download

API STD 618-2010 pdf free download.Reciprocating Compressors for Petroleum, Chemical, and Gas Industry Services.
3 Definitions of Terms For the purposes of this document, the following terms and definitions apply: 3.1 acoustic simulation: The process whereby the one-dimensional acoustic characteristics of fluids and the influence of the reciprocating compressor dynamic flow on these characteristics are modeled, taking into account the fluid properties and the geometry of the compressor and the connected vessels and piping. Note: The model is mathematically based upon the governing differential equations (motion, continuity, etc.). The simulation should allow for determination of pressure/flow modulations at any point in the piping model resulting from any generalized compressor excitation (see 3.1, 3.4, 3.9, 3.28, 3.39, and 3.57). 3.2 active analysis: A portion of the acoustic simulation in which the pressure pulsation amplitudes, due to imposed compressor operation for the anticipated loading, speed range, and state conditions, are simulated (see 3.1). 3.3 alarm point: A preset value of a measured parameter at which an alarm is actuated to warn of a condition that requires corrective action. 3.4 analog simulation: A method using electrical components (inductances, capacitances, resistances and current supply devices) to achieve the acoustic simulation (see 3.1). 3.5 anchor bolts: Bolts used to attach the mounting plate or machine to the support structure (concrete foundation or steel structure). Note: See 3.13 for definition of hold down bolts. Also see Figure L-1. 3.6 baseplate: A fabricated steel structure designed to provide support to the complete compressor and/or the drive equipment and other ancillaries which may be mounted upon it. 3.7 combined rod load: The algebraic sum of gas load and inertia force on the crosshead pin. Note: Gas load is the force resulting from differential gas pressure acting on the piston differential area. Inertia force is the force resulting from the acceleration of reciprocating mass.
3.10 drive train: Includes all drive equipment up to the compressor shaft free-end and all components coupled to the free-end of the crankshaft. 3.11 fail safe: A system which causes 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. 3.12 gauge board: A bracket or plate used to support and display gauges, switches, transmitters, and other instruments. A gauge board is open and not enclosed. Note: A gauge board is not a panel. A panel is an enclosure. See 3.35 for the definition of a panel. 3.13 hold down bolts (mounting bolts): Bolts holding the equipment to the mounting plate. 3.14 informative: Describes part of the standard that is provided for information and is intended to assist in the understanding of use of the standard. Note 1: Compliance with an informative part of the standard is not mandatory. Note 2: An annex may be informative or normative as indicated. See 3.32 for definition of normative. 3.15 inlet volume flow: The flow rate expressed in volume flow units at the conditions of pressure, temperature, compressibility and gas composition, including moisture content, at the compressor inlet flange. To determine inlet volume flow, allowance must be made for pressure drop across pulsation suppression devices and for interstage liquid knockout. Note: Inlet volume flow is a specific example of actual volume flow. Actual volume flow is the volume flow at any particular location such as interstage, compressor inlet flange or compressor discharge. Therefore, actual volume flow should not be used interchangeably with inlet volume flow. 3.16 local: The location of a device when mounted on or near the equipment or console. 3.17 manufacturer: The organization responsible for the design and manufacture of the equipment. Note: The manufacturer is often a different entity from the vendor.
3.18 manufacturer’s rated capacity: The capacity used to size the compressor, which is the quantity of gas, taken into the compressor cylinder at the specified inlet conditions, while the compressor is operating at the specified discharge pressure. Note: See 3.43, 3.48, and 6.1.3. 3.19 maximum allowable continuous combined rod load: The highest combined rod load at which none of the forces in the running gear (piston, piston rod, crosshead assembly, connecting rod, crankshaft, bearings etc.) and the compressor frame exceed the values in any component for which the manufacturer’s design permits continuous operation.

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