API STD 619-2010 pdf download.Rotary-type Positive Displacement Compressors for Petroleum, Petrochemical and Natural Gas Industries.
1 Scope This part of ISO 10440 specifies requirements for dry and oil-flooded, helical-lobe rotary compressors (see Figure 1) used for vacuum or pressure or both in petroleum, petrochemical, and gas industry services. It is intended for compressors that are in special-purpose applications. It is not applicable to general-purpose air compressors, liquid-ring compressors, or vane-type compressors. NOTE Standard air compressors are covered in ISO 10440-2. 2 Normative references 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. ISO 7 (all parts), Pipe threads where pressure-tight joints are made on the threads ISO 261, ISO general purpose metric screw threads — General plan ISO 262, ISO general-purpose metric screw threads — Selected sizes for screws, bolts and nuts ISO 281, Rolling bearings — Dynamic load ratings and rating life ISO 724, ISO general-purpose metric screw threads — Basic dimensions ISO 945 1) , Cast iron — Designation of microstructure of graphite ISO 965 (all parts), ISO general-purpose metric screw threads — Tolerances ISO 1217, Displacement compressors — Acceptance tests ISO 1328-1:1995, Cylindrical gears — ISO system of accuracy — Part 1: Definitions and allowable values of deviations relevant to corresponding flanks of gear teeth
3.18 maximum allowable differential pressure highest differential pressure that can be permitted in the compressor under the most severe operating conditions of minimum suction pressure and discharge pressure equal to the relief-valve setting 3.19 maximum allowable speed highest rotational speed of the power-input rotor at which the manufacturer’s design permits continuous operation 3.20 maximum allowable temperature maximum continuous temperature for which the manufacturer has designed the equipment (or any part to which the term is referred) when handling the specified fluid at the specified maximum operating pressure 3.21 maximum allowable working pressure MAWP maximum continuous pressure for which the manufacturer has designed the equipment (or any part to which the term is referred) when handling the specified fluid at the specified maximum operating temperature 3.22 maximum continuous speed highest rotational speed of the power-input rotor at which the machine, as built and tested, is capable of continuous operation with the specified fluid at any of the specified operating conditions 3.23 maximum power highest power the compressor and any shaft-driven appurtenances require for any of the specified operating conditions, including the effect of any equipment (e.g. pulsation suppression devices, process piping, intercoolers, after-coolers and separators) furnished by the compressor vendor NOTE Deviations from the specified conditions, such as relief-valve set pressure, are excluded from maximum power. 3.24 maximum sealing pressure highest pressure at which the seals are required to seal during any specified static or operating condition and during start-up and shutdown 3.25 minimum allowable speed lowest rotational speed of the power-input rotor at which the manufacturer’s design permits continuous operation 3.26 minimum allowable temperature lowest temperature for which the manufacturer has designed the equipment or part thereof
3.41 rotor rotating male or female assembly, including rotor body, shaft and shrunk-on sleeves (if furnished) NOTE See Figure 1. 3.42 rotor body helical profile section on or integral with the shaft 3.43 rotor set set consisting of both male and female rotors and, for dry screw compressors, including timing gears and thrust collars 3.44 seal barrier gas clean gas supplied to the area between the seals of a dual seal arrangement at a pressure higher than the process pressure 3.45 seal buffer gas clean gas supplied to the process (inboard) side of a seal 3.46 separation seal gas supply of inert gas or air fed into the region between the seal and the shaft bearing or between the bearing housing and atmosphere 3.47 settle-out pressure highest pressure which the compressor experiences when not running and after equilibrium has been reached NOTE This can be a function of ambient temperature, relief-valve setting and piping-system volume. 3.48 shutdown point preset value of a measured parameter at which automatic or manual shutdown of the system or equipment is required 3.49 slide valve device integral to the compression chamber for varying the volumetric flow through a rotary screw compressor NOTE See Figure B.2, item 8. 3.50 soleplate plate grouted to the foundation, with a mounting surface for equipment or for a baseplate