Jul,02

API Std 673 2002 pdf download

API Std 673 2002 pdf download

API Std 673 2002 pdf download.Centrifugal Fans for Petroleum, Chemical and Gas Industry Services.
1 Scope 1.1 This standard covers the minimum requirements for centrifugal fans for use in petroleum, chemical, and gas industry services. Fan static pressure rise is limited to differential usually not exceeding 130 in. (330 cm) of water equivalent air pressure from a single impeller or each impeller in a two stage fan. This standard does not apply to axial flow, aerial cooler, cooling tower, and ventilation fans and positive displacement blowers. 1.2 This standard covers equipment for both general purpose and special purpose applications. The purchaser shall determine which classification applies. NOTE Refer to Section 3 for definition of the terms general purpose and special purpose. 1.3 Additional or overriding requirements applicable to special purpose applications are included at the end of each section (e.g. 6.7.5, etc.). 2 Normative References 2.1 The editions of the following standards, codes, and specifications that are in effect at the time of publication of this standard shall, to the extent specified herein, form a part of this standard. The applicability of changes in standards, codes, and specifications that occur after the inquiry shall be mutually agreed upon by the purchaser and vendor. API Specification 5L, Specification for Line Pipe, Forty-Fifth Edition API Recommended Practice 500, Recommended Practice for Classification of Locations for Electrical Installations at Petroleum Facilities Classified as Class I, Division 1 and Division 2, Second Edition API Standard 541, Form-wound Squirrel-cage Induction Motors—500 Horsepower and Larger, Fourth Edition API Standard 546, Brushless Synchronous Machines—500 kVA and Larger, Third Edition API Standard 547, General-purpose Form-wound Squirrel Cage Induction Motors 250 Horsepower and Larger, First Edition API Recommended Practice 578, Material Verification Program for New and Existing Alloy Piping Systems, Second Edition
3.5 critical speed Shaft rotational speed at which the rotor-bearing support system is in a state of resonance. 3.6 evase Transition piece with increasing cross-sectional area in the direction of flow at the fan discharge. 3.7 fan impeller Assembly comprised of the blades, center plate (or back plate), shroud(s), hub, and wear plates, if used. 3.8 fan rated point Defined as 1) the highest speed necessary to meet any specified operating condition and 2) the rated capacity required by fan designs to meet all specified operating points. (The vendor shall select this capacity point to best encompass specified operating conditions within the scope of the expected performance curve.) (See Figure 1.) NOTE This term is NOT to be confused with the AMCA 802-02 definition of RATING point, which more nearly matches “normal point” per paragraph 3.2.5. It is suggested the user add head and/or volume margins for process uncertainties, reduced performance resulting from time related “wear and tear” and other operating conditions known to exist. The API “rated” point will be the same as the AMCA defined “MCR Test Block” (paragraph 3.1.13, AMCA 801-01) condition unless otherwise defined by the user in specifications or datasheets. For most applications this will coincide with “test block” (paragraph 3.1.14, AMCA 801-01). 3.9 fan rotor Assembly of the fan impeller and the shaft. 3.10 forced draft fans Usually have ambient inlet conditions and usually are in air service. This type of fan is providing ambient supply air to a unit such as fired heater for combustion air. 3.11 general purpose application Application that is usually spared or is in noncritical service. NOTE Ambient air fans such as forced draft fans may be unspared and may be deemed as general purpose. 3.12 hold-down bolts mounting bolts Bolts holding the equipment to the mounting plate. 3.13 hydrodynamic bearings Bearings that use the principles of hydrodynamic lubrication. 3.15 inlet volume flow Flow rate expressed in volume flow units at the conditions of pressure, temperature, compressibility, and gas composition, including moisture content, at the fan inlet flange. 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, impeller inlet, discharge, or fan discharge. Actual volume flow should not be used interchangeably therefore with inlet volume flow. 3.16 maximum allowable speed Highest speed at which the manufacturer’s design will permit continuous operation. NOTE The maximum allowable speed is usually set by rotor stress values.

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