Standard No.:	SH/T 3144-2004
English Name:	Engineering Specification of Centrifugal Compressor for Petrochemical Industry
Chinese Name:	石油化工离心压缩机工程技术规定
Professional Classification:	SH    Professional Standard - Petrochemical
Issued by:	NDRC
Issued on:	2004-10-20
Implemented on:	2005-4-1
Status:	superseded
Superseded by:	SH/T 3144-2012 Technical specification for centrifugal and axial compressor in petrochemical industry
Superseded on:	2013-3-1
Language:	English
File Format:	PDF
Word Count:	15000 words
Price(USD):	370.0
Delivery:	via email in 1 business day

1 Scope This Specification specifies the design, manufacture, inspection and test requirements for centrifugal compressor and its driver and auxiliary equipment in petrochemical industry. This Specification is applicable to engineering design and equipment procurement of centrifugal compressor in petrochemical industry and used in other industries for reference. This Specification is not applicable to the compressor with fan, blower and gear increaser, nor centrifugal compressor installed and used on ocean platform. 2 Normative References The following documents contain provisions which, through reference in this Specification, constitute provisions of this Specification. For dated reference, subsequent amendments to (excluding amending errors) to, or revisions of, any of these publications do not be applied. However, the parties whose enter into agreement according to this Specification are encouraged to research the latest editions of these references are applied or not. For any undated references, the latest edition of the document referred to applies. GBZ1-2002 Hygienic Standards for the Design of Industrial Enterprises HG20615 Types and Parameters for Steel Pipe Flanges (American System) SH3406 Steel Pipe Flanges for Petrochemical Industry API Std 611 General Purpose Steam Turbines for Petroleum, Chemical and Gas Industry Services API Std 612 Special Purpose Steam Turbines for Petroleum. Chemical and Gas Industry Services API Std 613 Special Purpose Gear Units for Petroleum, Chemical and Gas Industry Services API Std 614 Lubrication, Shaft-Sealin9, and Control-Oil Systems and Auxiliaries for Petroleum, Chemical and Gas Industry Services API Std 616 Gas Turbine for Refinery Services API Std 617-1995 Centrifugal Compressors for Petroleum. Chemical and Gas Industry Services API Std 670 Vibration, Axial-Position, and Bearing-Temperature Monitoring Systems API Std 671 Special Purpose Couplings For Petroleum, Chemical and Gas Industry Services ASME Boiler & Pressure Vessel Code. Section VIII, Rules for Construction of Pressure Vessels ASME B16.1 Cast Iron Piping Flanges and Flanged Fittings ASME B 16.5 Pipe Flanges and Flanged Fittings NPS l/2 through NPS 24 ASME B16.42 Ductile Iron Pipe Flanges and Flanged Fitting ASME B16.47 Large-Diameter Carbon Steel Flange ASME B31.3 Process piping NACE MR-0175 Sulfide Stress Cracking Resistant Metallic Material for Oil Field Equipment 3 Alternative Design The Vender may provide alternative design favorable to the parties (the Vendee and the Vender) in the aspects of technical and commercial angles. The alternative design provided by the Vender shall cover detailed description, achievement and standards and specifications. The Vendee will assess the alternative design and make a decision on whether to use it. 4 Terms and Definitions For the purpose of this Specification, the terms and definitions in API Std 617-1995, 1.4 apply. 5 Basic Design 5.1 General 5.1.1 The compressor unit (including auxiliary equipment) shall be designed and manufactured to reach the service life not shorter than 20 years and the expected continuous operation not shorter than 3 years. This is the system design criteria. Machine provided by the Vender shall have the specification within the design and manufacturing experience of the Vender unless otherwise the Vendee makes a written approval and the experience shows that it is reliable to operate at similar application conditions. At least two units of the same type have operated in the same or similar process conditions for two years and the type of unit may be considered to be reliable. 5.1.2 Unless otherwise specified, the Vender shall take full responsibility of the whole unit (including the centrifugal compressor, gear transmission (if necessary), driver, oil system, control, instrument, coupling, relevant auxiliary equipment and pipeline system), and shall be responsible for their reasonable matching. See Annex A for the supply scope of the Vender. Unless otherwise specified, the centrifugal compressor, driver and its auxiliary equipment shall be applicable to outdoor start and continuous operation under specified ambient conditions. 5.1.3 The Vender shall, according to component of process gas given by the Vendee and their physical property of single component, check and calculate specific heat and compressibility factor of multi-component process gas and other physical parameters of gas necessary to design the compressor and shall take final responsibility for the physical parameters of the gas. 5.1.4 Unless otherwise specified, outlet head of compressor shall be free from any negative deviation under specified flow and an appropriate shaft power shall not exceed 104% of expected value of the Vender. The Vender shall ensure the pressure head, flow and power when the compressor operates at rated condition as required by the process; the compressor shall be able to operate at other conditions required and the pressure head shall meet relevant requirements. 5.1.5 Unless otherwise specified, pressure head - flow characteristic curve shall rise continuously by 5% of rated head at least between normal operation point and surge point; at 110% rated flow, polytropic head shall not be less than 85% of nominal polytropic head. If two compressors are so designed to operate in the same condition and in parallel, the head difference on the two curves shall be less than 2% at any point with equal flow. 5.1.6 Cooling water system shall be designed in accordance with utilities provided by the Vendee and shall be equipped with measures to completely empty and evacuate water therein. 5.1.7 See 2.1.6~2.1.8 in API Std 617-1995. 5.1.8 Selection of all the electrical equipment, electrical elements, instrument and other E&I materials and their installation shall meet the requirements of electrical hazards area classification and site ambient conditions specified by the Vendee data sheet (see Annex B). 5.1.9 See 2.1.11~2.1.14 and 2.1.16~2.1.18 in API Std 617-1995. 5.2 Casing 5.2.1 See 2.2.1~2.2.2 of API Std 617-1995. 5.2.2 Casing outrigger shall be vertical to pedestal and the support leg shall be installed with jackscrew in vertical direction and drilled with lead holes. Vertical stainless steel adjustable pad shall be adopted and jacking measures shall be provided to increase or decrease the adjustable pad. 5.2.3 The Vender shall specify maximum permissible working pressure of casing which shall be at least equal to 1.25 times the sum of maximum suction pressure and maximum possible pressure rise when the compressor operates at the combination of all worst conditions required at the trip speed or at least equal to specified safety valve setting value, whichever is larger. 5.2.4 See 2.2.5~2.2.9 in API Std 617-1995. 5.2.5 Axially split casing shall adopt metal to metal connection (with suitable adhesive agent) and be appropriately bolted up. The axially split connection shall not use gaskets (including ribbon-shaped gasket). If agreed by the Vendee, axially split casing may be connected by o-shaped ring or processed circular groove on the connecting flange surface. If the gasket is used for connection between end cover and cylinder, for the radially split casing, the gasket shall be fastened securely. The gasket shall be in a continuous single sheet structure instead of overlapped or stacked type. Gasket material shall adapt to all the specified service conditions. The sealing face shall have roughness Ra at least 1.57 μm. 5.2.6 See 2.2.11~2.2.15 in API Std 617-1995. 5.2.7 The thread of metric system (ISO/M system) should be adopted for the thread of fasteners. Where the thread of British system (UN/UNC system) is adopted, it shall be approved by the Vendee. The general fasteners thread shall meet the following requirements: a) The bolts shall be arranged such to leave enough space for socket wrench or ring spanner (external thread only); b) Bolts with inner hexagon head, castellated nut or monkey spanner type bolts shall not be used unless otherwise agreed by the Vendee; c) Inner casing fastening bolts shall be tightly locked to avoid fall into air duct. 5.3 Interstage Diaphragms and Inlet Guide Vane 5.3.1 Interstage diaphragms and inlet guide vane shall be appropriate at all the specified operating conditions, start, shut-down, tripping, restoring stability and instant surge. Diaphragms shall be such designed to bear the maximum differential pressure likely to be present at any prescribed operating conditions and in case of loading down or shut-down. Internal fasteners (bolt and nut) in gas circuit shall be arranged in place to prevent fasteners from falling into the gas circuit due to breakdown or looseness to damage the compressor. 5.3.2 See 2.3.2~2.3.3 for API Std 617-1995. 5.3.3 Unless otherwise agreed by the Vendee, the axially split diaphragms shall be used and arranged with hoisting bolt hole or other hoisting measures for easy disassembly. The horizontally split compressor shall have all the diaphragms interlocked with casing. 5.3.4 Unless otherwise specified, partition with internal cooling passage shall not be adopted. 5.4 Casing Connections 5.4.1 General 5.4.1.1 The piping design, manufacture, inspection and test shall meet the requirements of one or more standard(s) among HG20615, SH3406, ASME B31.3, ASMEB16.47 and ASMEB16.5. 5.4.1.2 See 2.4.1.1~2.4.1.5 in API Std 617-1995. 5.4.1.3 All the pores on the casing for connecting pipes shall not be less than DN 20 (3/4 in) and shall be subjected to flange connection or processed into a flat face to be studded or welded. Full-penetration butt welding shall be adopted for all. If the pores are less than DN 25 (1 in), they may be provided with enhanced pipe connection with edges reinforced, but threaded connection shall not be used; If the socket welding is adopted as a connection mode, approval of the Vendee shall be obtained. 5.4.2 Connecting Pipe in Main Process Flow 5.4.2.1 Inlet and outlet shall be flanged or connected with stud after processing plane and the pipe orifice shall face the direction as specified in the data sheet. The connecting pipe at inlet and outlet of barrel compressor shall be arranged on the outer casing but not on the end cover. For the radially split cantilever compressor, connecting pipe at inlet and outlet of process gas may be arranged on end cover. 5.4.2.2 Flange pressure class is ANSI 300 at least and meets the following requirements: a) Face flange is used only for ductile cast iron casing and full raised face shall be provided; b) See 2.4.2.2.2~2.4.2.2.3 in API Std 617-1995. 5.4.2.3 If the ductile cast iron flange is equal to or less than DN 200 (8 in), it shall be a face flange and minimum thickness shall be ANSI 300 flange thickness in ASMEB 16.1. 5.4.3 Auxiliary Pipe Connection 5.4.3.1 Auxiliary connection includes, but not limited to connecting pipes for air discharge, liquid filling, sewage discharge, cooling water, lubricating and seal oil, flushing, buffer gas and balance disk cavity.

Foreword I 1 Scope 2 Normative References 3 Alternative Design 4 Terms and Definitions 5 Basic Design 5.1 General 5.2 Casing 5.3 Interstage Diaphragms and Inlet Guide Vane 5.4 Casing Connections 5.4.1 General 5.4.2 Connecting Pipe in Main Process Flow 5.4.3 Auxiliary Pipe Connection 5.5 External Force and External Moments 5.6 Rotating Element 5.7 Bearings and Bearing Housings 5.7.1 General 5.7.2 Radial Bearing 5.7.3 Thrust Bearing 5.7.4 Bearing Housings 5.8 Shaft End Seal 5.9 Dynamics 5.9.1 Critical Speed 5.9.2 Transverse Vibration Analyses 5.9.3 Factory Verification of Imbalance Response Analysis 5.9.4 Torsional Vibration Analyses 5.9.5 Vibration and Balance 5.10 Lubricating Oil and Shaft Seal Oil System 5.11 Materials 5.11.1 General 5.11.2 Pressure Parts 5.11.3 Low Temperature 5.11.4 Pressure Components Material Inspection 5.11.5 Inspection of Impeller Material 5.12 Noise 6 Accessories 6.1 Driver 6.2 Gear Transmission 6.3 Couplings and Guards 6.4 Base Plate 6.4.1 General 6.4.2 Base Plate 6.5 Instrumentation and Controls 6.5.1 General 6.5.2 Flow Rate Control 6.5.3 Local Instrumentation and Control Panel 6.5.4 Instrumentation 6.5.5 Alarm and Shutdown 6.5.6 Electric System 6.5.7 Detector of Vibration, Displacement and Bearing Temperature 6.6 Piping System 6.6.1 General 6.6.2 Process Piping 6.6.3 Auxiliary Piping 6.7 Special Tools 7 Inspection and Testing 7.1 General 7.2 Inspection 7.3 Testing 7.3.1 General Requirements 7.3.2 Hydraulic Pressure Test 7.3.3 Impeller Overspeed Test 7.3.4 Mechanical Operation Test 7.3.5 Gas Leakage Test of Compressor after Assembly 7.3.6 Optional Test 8 Painting, Marking, Package and Shipment 8.1 Painting 8.2 Nameplate and Rotation Arrow 8.3 Marking 8.4 Package and Shipment 9 Guarantee 9.1 Mechanical Guarantee 9.1.1 Shaft End Seal Leakage 9.1.2 Bearing Temperature 9.1.3 Bearing Housing Vibration 9.2 Performance Guarantee 10 Vendor's Data 10.1 General 10.2 Quotation Data 10.3 Contract Data Annex A (Informative) Referenced Scope of Supply Annex B (Informative) Format of Data Sheet for Centrifugal Compressor Annex C (Informative) Comparison of Major Materials Used for Compressor Annex D (Informative) Supplementary Normative References Annex E (Informative) Comparison of Piping Materials Annex F (Informative) Vendor’s Drawings and Documentation Wording Explanation