API St 677-2010 pdf free download

API St 677-2010 pdf free download.General-Purpose Gear Units for Petroleum, Chemical and Gas Industry Services.
1.4.10 informative element: Describes part of the standard which is provided for information and is intended to assist in the understanding or use of the standard. Compliance with an informative part of the standard is not mandated. Note: An appendix may be informative or normative as indicated. 1.4.11 maximum allowable speed (in revolutions per minute): The highest speed at which the manufacturer’s design will permit continuous operation. 1.4.12 maximum continuous speed (in revolutions per minute): The speed at least equal to 105% of the rated pinion speed for variable-speed units and is the rated pinion speed for constant-speed units. 1.4.13 minimum allowable speed (in revolutions per minute): The lowest speed at which the manufacturer’s design will permit continuous operation. 1.4.14 nominal pressures (PN): A numerical designation relating to pressure that is a convenient round number for refer- ence purposes. 1.4.15 normal transmitted power: The power at which usual operation is expected and optimum efficiency is desired. The normal transmitted power may be equal to or less than the gear-rated power. 1.4.16 normative: A requirement of the standard. 1.4.17 pinion: The higher speed element of a gear set. 1.4.18 rated input speed of the gear unit (in revolutions per minute): The specified (or nominal) rated speed of its driver, as designated by the purchaser on the data sheets. 1.4.19 rated output speed of the gear unit (in revolutions per minute): The specified (or nominal) rated speed of its driven equipment, as designated by the purchaser on the data sheets. 1.4.20 standby service: A normally idle or idling piece of equipment that is capable of immediate automatic or manual start-up and continuous operation. 1.4.21 thermal capacity: The horsepower a unit will transmit continuously for 3 hours or more without exceeding an operat- ing sump temperature rise of 45°C (80°F) above ambient.
1.4.22 total indicator reading (TIR), also known as total indicated runout: The difference between the maximum and minimum readings of a dial indicator or similar device, monitoring a face or cylindrical surface during one complete revolu- tion of the monitored surface. Note: For a perfectly cylindrical surface, the indicator reading implies an eccentricity equal to half the reading. For a perfectly flat face the indi- cator reading gives an out-of squareness equal to the reading. If the diameter in question is not perfectly cylindrical or flat, interpretation of the meaning of TIR is more complex and may represent ovality or lobing. 1.4.23 trip speed (in revolutions per minute): The speed at which the independent emergency overspeed device operates to shut down a prime mover. For steam turbines and reciprocating engines, the trip speed will be at least 110% of the maximum con- tinuous speed. For gas turbines, the trip speed will be at least 105% of the maximum continuous speed. 1.4.24 tooth pitting index (K): Defined in 2.4.3. 1.4.25 unit responsibility: The responsibility for coordinating the technical aspects of the equipment and all auxiliary sys- tems included in the scope of the order. It includes responsibility for reviewing such factors as the power requirements, speed, rotation, general arrangement, couplings, dynamics, noise, lubrication, sealing system, material test reports, instrumentation, pip- ing, and testing of components. 1.4.26 vendor (also known as supplier): The agency that, supplies the equipment. Note: The vendor may be the manufacturer of the equipment or the manufacturer’s agent and normally is responsible for service support. 1.5 REFERENCED PUBLICATIONS 1.5.1 Referenced publications are listed in Appendix F. 1.5.2 All referenced standards, to the extent specified in the text, are normative. 1.5.3 Notes following a paragraph are informative.