Standard No.:	GB/T 3215-2019
English Name:	Centrifugal pumps for petroleum,petrochemical and natural gas industries
Chinese Name:	石油、石化和天然气工业用离心泵
Chinese Classification:	J71    Pump
Professional Classification:	GB    National Standard
Issued by:	SAMR; SAC
Issued on:	2019-12-10
Implemented on:	2020-7-1
Status:	valid
Superseding:	GB/T 3215-2007 Centrifugal pumps for petroleum petrochemical and natural gas industries
Language:	English
File Format:	PDF
Word Count:	87000 words
Price(USD):	2610.0
Delivery:	via email in 1 business day

Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative. This standard is developed in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 3215-2007 Centrifugal pumps for petroleum petrochemical and natural gas industries. The following technical changes have been made with respect to GB/T 3215-2007: —The standard title has been revised from "Centrifugal pumps for petroleum petrochemical and natural gas industries" to "Centrifugal pumps for petroleum, petrochemical and natural gas industries" (see the cover and front page; the cover and front page of the 2007 edition); —The scope has been revised (see Clause 1; Clause 1 of the 2007 edition); —The normative references have been revised (see Clause 2; Clause 2 of the 2007 edition); —The terms and definitions have been revised (see Clause 3; Clause 3 of the 2007 edition); —The classification and type identification, units and specific requirements have been revised (see Clauses 4 and 5; Clause 4 of the 2007 edition); —That the vendor shall specify on the data sheets the NPSH3 based on water [at a temperature of less than 65 °C] at the rated flow and rated speed has been revised to "the vendor shall specify...[at a temperature of less than 55 °C]..." (see 6.1.8; 5.1.10 of the 2007 edition); —In 6.1.12, a note has been introduced to give a description of the best efficiency point flowrate for the pump as furnished (see 6.1.12); —The conditions for which water-cooling systems shall be designed have been expressed in a modified way (see 6.1.20; 5.1.22 of the 2007 edition); —The requirements for bolting and threads have been revised (see 6.1.29; 5.1.31 of the 2007 edition); —The requirements for the tensile stress used in the design of the pressure casing for any material have been revised (see 6.3.4; 5.3.4 of the 2007 edition); —The requirement that the pump-seal chamber and seal gland shall have a pressure-temperature rating at least equal to the maximum allowable working pressure and temperature of the pump casing to which it is attached, in accordance with GB/T 34875-2017 has been introduced (see 6.3.5); —Recommendations on spiral-wound gaskets and gaskets have been introduced to the requirements of radially split casings for metal-to-metal fits, with confined controlled-compression gaskets (see 6.3.10); —Requirements for openings for core support, core removal or waterway inspection and cleaning have been introduced (see 6.3.16); —A parallelism range between the machined faces of pump flanges and the plane as shown on the general arrangement drawing has been introduced (see 6.4.2.6); —The requirements for piping and auxiliary connections to the pressure casing have been revised (see 6.4.3; 5.4.3 of the 2007 edition); —Requirements for piping gussets have been introduced (see 6.4.3.10); —The figure illustrating the measurement of "Seal chamber face runout" has be relocated to the standard body (see 6.8.4 and 6.8.5; Annex K of the 2007 edition); —The requirements for dynamics have been revised (see 6.9; 5.9 of the 2007 edition); —A torsional analysis flow chart has been introduced (see Figure 29); —The items under the type of motor, its characteristics and the accessories that the purchaser shall specify have been revised (see 7.1.5; 6.1.4 of the 2007 edition); —The requirements for couplings have been revised (see 7.2.2; 6.2.2 of the 2007 edition); —A working requirement for coupling guards with potentially explosive atmospheres has been introduced (see 7.2.15); —A requirement of the rim or pan type specified by the purchaser has been introduced (see 7.3.1); —Casing material inspection requirements have been introduced (see Table 14); —A temperature of water used in performance tests has been introduced (see 8.3.3.2 i); —The performance tolerances have been revised (see Table 16; Table 14 of the 2007 edition); —A test method of net positive suction head required has been introduced (see 8.3.4.3.3); —Shaft stiffness and bearing system life have been introduced (see Annex I). This standard has been redrafted and modified in relation to International Standard ISO 13709:2009 Centrifugal pumps for petroleum, petrochemical and natural gas industries. This standard has made a few structural changes with regard to ISO 13709:2009. Corresponding numbering of equivalent clauses between this standard and the International Standard ISO 13709: 2009 is given in Annex A. There are technical deviations between this standard and the International Standard ISO 13709: 2009. The clauses/subclauses related to these deviations have been identified by vertical single line (|) marked in the blank position of the outer page margin. The technical deviations, together with their justifications, are given in Annex B. This standard was proposed by the China Machinery Industry Federation. This standard is under the jurisdiction of the National Technical Committee on Pumps of Standardization Administration of China (SAC/TC 211). The previous editions of this standard are as follows: —GB/T 3215-1982 and GB/T 3215-2007. Introduction It is necessary that users of this standard be aware that further or differing requirements can be needed for individual applications. This standard is not intended to inhibit a vendor from offering, or the purchaser from accepting, alternative equipment or engineering solutions for the individual application. This can be particularly appropriate where there is innovative or developing technology. Where an alternative is offered, it is necessary that the vendor identify any variations from this standard and provide details. A bullet (●) at the beginning of a clause or subclause indicates that either a decision is required or the purchaser is required to provide further information. It is necessary that this information should be indicated on data sheets or stated in the enquiry or purchase order (see Figure C.1, Figure C.2 and Figure C.3). In this standard, where practical, US Customary, or other, units are included in parentheses for information. Centrifugal pumps for petroleum, petrochemical and natural gas industries 1 Scope This standard specifies requirements for centrifugal pumps, including pumps running in reverse as hydraulic power recovery turbines, for use in petroleum, petrochemical and gas industry process services. This standard is applicable to overhung pumps, between-bearings pumps and vertically suspended pumps (see Table 1). Clause 9 provides requirements applicable to specific types of pump. All other clauses of this standard are applicable to all pump types. Illustrations are provided of the various specific pump types and the designations assigned to each specific type. Relevant industry operating experience suggests pumps produced to this standard are cost effective when pumping liquids at conditions exceeding any one of the following: —discharge pressure (gauge): 1,900 kPa (275 psi; 19.0 bar); —suction pressure (gauge): 500 kPa (75 psi; 5.0 bar); —pumping temperature: 150 °C (300 °F); —rotative speed: 3,600 r/min; —rated total head: 120 m (400 ft); —impeller diameter, overhung pumps: 330 mm (13 in). Note: For sealless pumps, reference can be made to API Std 685. For heavy duty pump applications in industries other than petroleum, petrochemical and gas processing, reference can be made to ISO 9905. 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 (including any amendments) applies. GB/T 193 General purpose metric screw threads—General plan (GB/T 193-2003, ISO 261:1998, MOD) GB/T 196 General purpose metric screw threads—Basic dimensions (GB/T 196-2003, ISO 724:1993, MOD) GB/T 755 Rotating electrical machines—Rating and performance (GB/T 755-2008, IEC 60034-1:2004, IDT) GB/T 3216 Rotodynamic pumps—Hydraulic performance acceptance tests—Grades 1,2 and 3 (GB/T 3216-2016, ISO 9906:2012, IDT) GB/T 3768 Acoustics—Determination of sound power levels and sound energy levels of noise sources using sound pressure—Survey method using an enveloping measurement surface over a reflecting plane (GB/T 3768-2017, ISO 3746:2010, IDT) GB/T 6391-2010 Rolling bearings—Dynamic load ratings and rating life (ISO 281: 2007, IDT) GB/T 6557 Mechanical vibration—Methods and criteria for the mechanical balancing of flexible rotors (GB/T 6557-2009, ISO 11342:1998, IDT) GB/T 7307 Pipe threads with 55 degree thread angle where pressure-tight joints are not made on the threads (GB/T 7307-2001, ISO 228-1:1994, MOD) GB/T 8196 Safety of machinery—Guards—General requirements for the design and construction of fixed and movable guards (GB/T 8196-2003, ISO 14120:2002, MOD) GB/T 8923 (all parts) Preparation of steel substrates before application of paints and related products—Visual assessment of surface cleanliness [ISO 8501 (all parts)] GB/T 9144 General purpose metric screw threads—Preferable plan (GB/T 9144-2003, ISO 262:1998, MOD) GB/T 9239.1 Mechanical vibration—Balance quality requirements for rotors in a constant (rigid) state—Part 1: Specification and verification of balance tolerances (GB/T 9239.1-2006, ISO 1940-1:2003, IDT) GB/T 19867 (all parts) Specification and qualification of welding procedures for metallic materials—Welding procedure specification [ISO 15609 (all parts)] GB/T 20972.1 Petroleum and natural gas industries—Material for use in H2S-containing environments in oil and gas production—Part 1: General principles for selection of cracking resistant materials (GB/T 20972.1-2007, ISO 15156-1:2001, IDT) GB/Z 32458 Centrifugal pumps handling viscous liquids—Performance corrections (GB/Z 32458-2015, ISO/TR 17766:2005, IDT) GB/T 34875-2017 Pumps—Shaft sealing systems for centrifugal and rotary pumps (ISO 21049: 2004, IDT) GB/T 35147 Petroleum and natural gas industries—Flexible couplings for mechanical power transmission—General purpose applications (GB/T 35147-2017, ISO 14691:2008, MOD) ISO 7-1 Pipe threads where pressure-tight joints are made on the threads—Part 1: Dimensions, tolerances and designation ISO 286 (all parts) ISO system of limits and fits ISO 965 (all parts) ISO general-purpose metric screw threads—Tolerances ISO 3117 Tangential keys and keyways ISO 4200 Plain end steel tubes, welded and seamless—General tables of dimensions and masses per unit length ISO 5753 Rolling bearing—Radial internal clearance ISO 7005-1 Metallic flanges—Part 1: Steel flanges for industrial and general service piping systems ISO 7005-2 Metallic flanges—Part2: Cast iron flanges ISO 9606 (all parts) Approval testing of welders—Fusion welding1) ISO 10438: 2007 (all parts) Petroleum, petrochemical and natural gas industries—Lubrication, shaft-sealing and control-oil systems and auxiliaries ISO 10441 Petroleum, petrochemical and natural gas industries—Flexible couplings for mechanical power transmission—Special-purpose applications ISO 10721-2 Steel structures—Part2: Fabrication and erection ISO 15649 Petroleum and natural gas industries—Piping IEC 60034-2-1 Rotating electrical machines—Part2-1: Standard methods for determining losses and efficiency from tests (excluding machines for traction vehicles) IEC 60079 (all parts) Electrical apparatus for explosive gas atmospheres2) EN 953 Safety of machinery—Guards—General requirements for the design and construction of fixed and movable guards EN 13445 (all parts) Unfired pressure vessels EN 13463-1 Non-electrical equipment for use in potentially explosive atmospheres—Part1: Basic method and requirements ANSI/ABMA 7 Shaft and housing fits for metric radial ball and roller bearings (except tapered roller bearings) conforming to basic boundary plan 3) ANSI/AGMA 9000 Flexible couplings—potential unbalance classification4) ANSI/AGMA 9002 Bores and keyways for flexible couplings (inch series) ANSI/AMT B15.1 Safety standard for mechanical power transmission apparatus5) ANSI/API Std 541 Form-wound squirrel-cage induction motors—500 horsepower and larger ANSI/API Std 611 General-purpose steam turbines for petroleum, chemical and gas industry services ANSI/API Std 670 Machinery protection systems ANSI/API Std 671/ISO 10441 Special purpose couplings for petroleum, chemical and gas industry services ANSI/ASME B1.1 Unified inch screw threads, UN and UNR thread form6) ANSI/ASME B16.1 Gray iron pipe flanges and flanged fittings: Classes 25, 125 and 250 ANSI/ASME B16.5 Pipe flanges and flanged fittings: NPS1/2 through NPS 24 metric/inch standard ANSI/ASME B16.11 Forged steel fittings, socket-welding and threaded ANSI/ASME B16.42 Ductile iron pipe flanges and flanged fittings, Classes 150 and 300 ANSI/ASME B16.47 Larger diameter steel flanges: NPS 26 through NPS 60 ANSI/ASME B18.18.2M Inspection and quality assurance for high-volume machine assembly fasteners ANSI/ASME B31.3 Process piping ANSI/HI 1.6 Centrifugal tests 7) ANSI/HI 2.6 American national standard for vertical pump tests API Std 547 General-purpose form-wound squirrel cage induction motors—250 horsepower and larger API Std 677 General-purpose gear units for petroleum, chemical and gas industry services ASME Boiler and pressure vessel code BPVC, Section V, Nondestructive examination ASME Boiler and pressure vessel code BPVC, Section VIII, Rules for construction of pressure vessels ASME Boiler and pressure vessel code BPVC, Section IX, Welding and brazing qualifications DIN 910 Heavy-duty hexagon head screw plugs8) IEE 841 IEEE standard for petroleum and chemical industry—Severe Duty Totally Enclosed Fan-Cooled (TEFC) squirrel cage induction motors—Up to and including 370 kW (500 hp)9) MSS SP-55 Quality standard for steel castings for valves, flanges and fittings and other piping components—Visual method for evaluation of surface irregularities 10) NACE MR0103 Materials resistant to sulfide stress cracking in corrosive petroleum refining environments11) NFPA 70:2008 National electrical code12) SSPC SP 6 Commercial blast cleaning13) 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 axially split principal mating face of pump casing parallel to the axis 3.2 allowable operating region portion of a pump's hydraulic coverage over which the pump is allowed to operate, based on vibration within the upper limit of this standard or temperature rise or other limitation, specified by the manufacturer 3.3 barrel pump horizontal pump of the double-casing type 3.4 barrier fluid externally supplied fluid, at a pressure above the pump seal chamber pressure, introduced into an Arrangement 3 seal (pressurized dual mechanical seal) to completely isolate the pump process liquid from the environment 3.5 best efficiency point; BEP flowrate at which a pump achieves its highest efficiency at rated impeller diameter Note: The best efficiency point flowrate at maximum impeller diameter is used to determine pump specific speed and suction-specific speed. The best efficiency point flowrate is reduced with reduced impeller diameters. 3.6 buffer fluid externally supplied fluid, at a pressure lower than the pump seal chamber pressure, used as a lubricant and/or to provide a diluent in an Arrangement 2 seal (unpressurized dual mechanical seal) 3.7 cartridge-type element assembly of all the parts of the pump except for the casing 3.8 classically stiff characterized by the first dry critical speed being above the pump's maximum continuous speed by the following: 20 % for rotors designed for wet running only; 30 % for rotors designed to be able to run dry. 3.9 critical speed shaft rotational speed at which the rotor-bearing-support system is in a state of resonance 3.10 datum elevation elevation to which values of NPSH are referred (see 6.1.8) See net positive suction head (3.33). 3.11 design manufacturer's calculated parameter Note: “Design” is a term that may be used by the equipment manufacturer to describe various parameters, such as design power, design pressure, design temperature, or design speed. This term should be used only by the equipment manufacturer and not in the purchaser's specifications. 3.12 double casing type of pump construction in which the pressure casing is separate from the pumping elements contained in the casing Note: Pumping elements include diffuser, diaphragms, bowls and volute inner casings. 3.13 drive-train component item of the equipment used in series to drive the pump Examples: Motor, gear, turbine, engine, fluid drive, clutch. 3.14 dry critical speed rotor critical speed calculated assuming that there are no liquid effects, that the rotor is supported only at its bearings and that the bearings are of infinite stiffness 3.15 element bundle assembly of the rotor plus the internal stationary parts of a centrifugal pump 3.16 hydraulic power recovery turbine; HPRT turbomachine designed to recover power from a fluid stream 3.17 hydrodynamic bearing bearing that uses the principles of hydrodynamic lubrication 3.18 identical pump pump of the same size, hydraulic design, number of stages, rotational speed, clearances, type of shaft seal (axial face or breakdown bushing), type of bearings, coupling mass, coupling overhang, and pumping the same liquid 3.19 maximum allowable speed highest speed at which the manufacturer's design permits continuous operation 3.20 maximum allowable temperature maximum continuous temperature for which the manufacturer has designed the pump (or any part to which the term is referred) when pumping the specified liquid at the specified maximum operating pressure (does not include mechanical seal) See pressure casing (3.43). 3.21 maximum allowable working pressure; MAWP maximum continuous pressure for which the manufacturer has designed the pump (or any part to which the term is referred) when pumping the specified liquid at the specified maximum operating temperature (does not include mechanical seal) 3.22 maximum discharge pressure maximum suction pressure plus the maximum differential pressure of the pump when operating at rated speed and the specified normal relative density (specific gravity) 3.23 maximum dynamic sealing pressure highest pressure expected at the seals during any specified operating condition and during start-up and shut-down Note: Both dynamic and static sealing pressures are important to selection of the mechanical seal. They are dependent on the pump suction pressure, operating point and pump clearances. They are also affected by the pressure of the seal flush. This pressure is specified by the seal vendor. See GB/T 34875-2017 or ANSI/API Std 682/ISO 21049. 3.24 maximum operating temperature highest temperature of the pumped liquid, including upset conditions, to which the pump is exposed Note: This temperature is specified by the seal vendor. See GB/T 34875-2017 or ANSI/API Std 682/ISO 21049. 3.25 maximum static sealing pressure highest pressure, excluding pressures encountered during hydrostatic testing, to which the seals can be subjected while the pump is shut down 3.26 maximum suction pressure highest suction pressure to which the pump is subjected during operation (non-transient; does not include waterhammer) 3.27 minimum allowable speed lowest speed at which the manufacturer's design permits continuous operation Note: The speed is expressed in units of revolutions per minute (r/min). 3.28 minimum continuous stable flow lowest flow at which the pump can operate without exceeding the vibration limits imposed by this standard 3.29 minimum continuous thermal flow lowest flow at which the pump can operate without its operation being impaired by the temperature rise of the pumped liquid 3.30 minimum design metal temperature lowest mean metal temperature (through the thickness) expected in service, including operation upsets, auto-refrigeration and temperature of the surrounding environment, for which the equipment is designed 3.31 multistage pump pump with three or more stages See also 4.2. 3.32 nominal pipe size; NPS designation, usually followed by a size designation number, corresponding approximately to the outside diameter of the pipe Note: The NPS is expressed in inches (in). 3.33 net positive suction head; NPSH absolute inlet total head above the head equivalent to the vapour pressure referred to the NPSH datum plane Note: NPSH is expressed in metres (m) or feet (ft). 3.34 net positive suction head available; NPSHA NPSH determined by the purchaser according to the pump conditions (the liquid at the rated flow and normal pumping temperature) 3.35 net positive suction head required; NPSH3 NPSH that results in a 3 % loss of head (first-stage head in a multistage pump) determined by the vendor by testing with water 3.36 normal operating point point at which the pump is expected to operate under normal process conditions 3.37 normal-wear part part normally restored or replaced at each pump overhaul Examples: Wear rings, inter-stage bushings, balancing device, throat bushing, seal faces, bearings and gaskets. 3.38 observed inspection observed test inspection or test where the purchaser is notified of the timing of the inspection or test and the inspection or test is performed as scheduled, regardless of whether the purchaser or his representative is present 3.39 oil-mist lubrication lubrication provided by oil mist produced by atomization and transported to the bearing housing by compressed air 3.40 operating region portion of a pump's hydraulic coverage over which the pump operates 3.41 overhung pump pump whose impeller is supported by a cantilever shaft from its bearing assembly 3.42 preferred operating region portion of a pump's hydraulic coverage over which the pump's vibration is within the base limit of this standard 3.43 pressure casing composite of all stationary pressure-containing parts of the pump, including all nozzles, seal glands, seal chambers and auxiliary connections but excluding the stationary and rotating members of mechanical seals Note: The seal flush piping, auxiliary piping and valves on the atmospheric side of the seal gland are not part of the pressure casing. 3.44 purchaser owner, or owner's agent, who issues the order and specification to the vendor 3.45 pure oil-mist lubrication (dry sump) system in which the mist both lubricates the bearing(s) and purges the housing and there is no oil level in the sump 3.46 purge oil-mist lubrication (wet sump) systems in which the mist only purges the bearing housing 3.47 radially split split with the principal joint of pump casing perpendicular to the pump axis 3.48 rated operating point point at which the vendor certifies that pump performance is within the tolerances stated in this standard Note: Normally, the rated operating point is the specified operating point with the highest flow. 3.49 relative density specific gravity property of a liquid expressed as the ratio of the liquid's density to that of water at standard temperature Note: Standard temperature is 4 °C (39.2 °F). 3.50 rotor assembly of all the rotating parts of a centrifugal pump 3.51 similar pump pump that is accepted, by agreement between purchaser and manufacturer as sufficiently similar to not require a lateral analysis, taking into account the factors listed for an identical pump (3.18) 3.52 specific speed index relating flow, total head and rotational speed for pumps of similar geometry 3.53 stage one impeller and associated diffuser or volute and return channel, if required 3.54 suction-specific speed index relating flow, NPSH3 and rotative speed for pumps of similar geometry 3.55 throat bushing device that forms a restrictive close clearance around the sleeve (or shaft) between the seal or inner seal of a dual seal cartridge and the impeller 3.56 total indicator reading total indicated runout; TIR difference between the maximum and minimum readings of a dial indicator or similar device, monitoring a face or cylindrical surface, during one complete revolution 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 indicator reading gives an 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 can represent ovality or lobing. 3.57 trip speed (electric motor driver) electric motor driver-synchronous speed at maximum supply frequency 3.58 trip speed (variable-speed driver) variable-speed driver-speed at which the independent emergency over-speed device operates to shut down the driver 3.59 unit responsibility responsibility for coordinating the documentation, delivery and technical aspects of the equipment and all auxiliary systems included in the scope of the order Note: The technical aspects for consideration include, but are not limited to, such factors as the power requirements, speed, rotation, general arrangement, couplings, dynamics, lubrication, sealing system, material test reports, instrumentation, piping, conformance to specifications and testing of components. 3.60 vendor supplier manufacturer or manufacturer's agent that supplies the equipment and is normally responsible for service support 3.61 vertical in-line pump vertical-axis, single-stage, overhung pump whose suction and discharge connections have a common centreline that is perpendicular to the pump axis Note: Types VS6 and VS7 are not considered in-line pumps. 3.62 vertically suspended pump vertical-axis pump whose liquid end is suspended from a column and mounting plate Note: The pump's liquid end is usually submerged in the pumped liquid. 3.63 wet critical speed rotor critical speed calculated considering the additional support and damping produced by the action of the pumped liquid within internal running clearances at the operating conditions and allowing for stiffness and damping within the bearings 3.64 witnessed test witnessed inspection inspection or test for which the purchaser is notified of the timing of the inspection or test and a hold is placed on the inspection or test until the purchaser or his agent is in attendance 4 General 4.1 Unit responsibility Unless otherwise specified, the pump vendor shall have unit responsibility. The pump vendor shall ensure that all sub-vendors comply with the requirements of this standard and all reference documents. 4.2 Classification and designation 4.2.1 Description of codes The pumps described in this standard are classified and designated by type codes, as shown in Table 1.   Table 1 Pump classification type identification Pump type a Orientation Type code Centrifugal pumps Overhung Flexibly coupled Horizontal Foot-mounted OH1 Centreline-supported OH2 Vertical in-line with bearing bracket — OH3 Rigidly coupled Vertical in-line — OH4 Close-coupled Vertical in-line — OH5 High-speed integrally geared — OH6 Between-bearings 1- and 2-stage Axially split — BB1 Radially split — BB2 Multistage Axially split — BB3 Radially split Single casing BB4 Double casing BB5 Vertically suspended Single casing Discharge through column Diffuser VS1 Volute VS2 Axial flow VS3 Separate discharge Line shaft VS4 Cantilever VS5 Double casing Diffuser — VS6 Volute — VS7 a Illustrations of the various types of pump are provided in 4.2.2. 4.2.2 Pump designations and descriptions 4.2.2.1 Pump type OH1 Foot-mounted, single-stage overhung pumps shall be designated pump type OH1, see Figure 1. (This type does not meet all the requirements of this standard; see Table 3.) Figure 1 Pump type OH1 4.2.2.2 Pump type OH2 Centreline-mounted, single-stage overhung pumps shall be designated pump type OH2, see Figure 2. They have a single bearing housing to absorb all forces imposed upon the pump shaft and maintain rotor position during operation. The pumps are mounted on a baseplate and are flexibly coupled to their drivers.

Foreword i Introduction iv 1 Scope 2 Normative references 3 Terms and definitions 4 General 4.1 Unit responsibility 4.2 Classification and designation 5 Technical requirements 5.1 Units 5.2 Statutory requirements 5.3 Requirements 6 Basic design 6.1 General 6.2 Pump types 6.3 Pressure casings 6.4 Nozzles and pressure casing connections 6.5 External nozzle forces and moments 6.6 Rotors 6.7 Wear rings and running clearances 6.8 Mechanical shaft seals 6.9 Dynamics 6.10 Bearings and bearing housings 6.11 Lubrication 6.12 Materials 6.13 Nameplates and rotation arrows 7 Accessories 7.1 Drivers 7.2 Couplings and guards 7.3 Baseplates 7.4 Instrumentation 7.5 Piping and appurtenances 7.6 Special tools 8 Inspection, testing, and preparation for shipment 8.1 General 8.2 Inspection 8.3 Testing 8.4 Preparation for shipment 9 Specific pump types 9.1 Single-stage overhung pumps 9.2 Between-bearings pumps (types BB1, BB2, BB3 and BB5) 9.3 Vertically suspended pumps (types VS1 through VS7) 10 Vendor's data 10.1 General 10.2 Proposals 10.3 Contract data Annex A (Informative) Corresponding numbering of equivalent clauses between this standard and ISO 13709: 2009 Annex B (Informative) Technical deviations of this standard from ISO 13709: 2009 and their justifications Annex C (Informative) Pump datasheets and electronic data exchange Annex D (Normative) Hydraulic power recovery turbines Annex E (Informative) Specific speed and suction-specific speed Annex F (Normative) Cooling water and lubrication system schematics Annex G (Normative) Materials and material specification for pump parts Annex H (Normative) Criteria for piping design Annex I (Informative) Shaft stiffness and bearing system life Annex J (Informative) Materials class selection guidance Annex K (Normative) Standard baseplates Annex L (Informative) Inspector's checklist Annex M (Informative) Test data summary Annex N (Informative) Vendor drawing and data requirements Annex O (Normative) Lateral analysis Annex P (Normative) Determination of residual unbalance Bibliography