Technical Specification of Stainless Steel Off
Contents
1. mounting plates shall be provided as per the standard API 673 4 General Construction Details 4 1 Material Of Construction The material of construction is as specified below for different parts of the blowers Material test certificates physical amp chemical check of the parts shall be submitted to the purchaser for its review All components with weld upon which welding has to be carried out during fabrication shall have corrosion rate lt 18 mpy when tested as per ASTM A 262 IGC Pr C Check Tests for material conformation shall be carried out in presence of purchaser s inspector Impellers AISI SS 304L 316L as per ASTM A240 Casing AISI SS 304L 316L as per ASTM A240 Casing Stiffeners Bracing AISI SS 304L 316L as per ASTM A240 Shaft AISI SS 304L 316L as per ASTM A276 Flexible bellow Stainless steel Base frame Structural Steel as per IS 2062 Shaft seal Mechanical seal Bearing amp bearing housing Standard Original SKF Hardware nuts blots washers Stainless Steel 4 2 Component Specific Requirements 4 2 1 Blower Casing The housing shall be fabricated from plates of minimum 6 4 mm thick accurately cut amp formed and continuously welded throughout for added strength and total air tight construction The casing shall be suitably stiffened by means of angles flats as required The casing shall be radial split type The cut off shall be so designed to give smooth quiet amp efficient performanc2. Control Method b Control accuracy Rated I P Voltage Output Voltage amp Current with harmonic contents at 25 50 75 and 100 load wo 4 5 6 Output frequency 7 Over Torque Capacity 8 Under Torque Capacity 9 Control Input s 10 Control Output s 11 Communication 12 Acceleration Deceleration Tune 13 Motor Protection 14 Speed Controller Protection 15 Std Functions 16 Degree of Protection 17 Ambient Conditions 18 Operating Position 19 Dimension 20 Weight 21 Control panel details Note After publishing the tender if there is any change in specification it will be published as corrigendum in the MRPU portal Accessories Breakup costs etc if any may be quoted online in the Price Bid Alternate Offer form Page 16 of 16
3. amp Codes Latest edition of the following codes and standards shall be applicable In the event of any conflict between any requirement in this specification and that of the applicable codes and standards the governing requirement shall be the more stringent of the two at the discretion of the purchaser API 673 Centrifugal Fans for Chemical petroleum amp Industrial services IS 4894 DIN 24163 Specification for centrifugal fans ISO 2372 VDI 2056 Vibration severity amp group classification ISO 1940 VDI 2060 Balancing quality requirements ASME Sec V NDT requirements ASME Sec IX Welding Qualifications 3 General Design Requirements as per standard API 673 3 1 The blower shall be of centrifugal type having radial blade design The blower shall be SISW Arrangement 1 3 2 The equipment including auxiliaries shall be designed and constructed for a minimum service life of 20 years and at least 3 years of uninterrupted service 3 3 The vendor shall assume unit responsibility for all auxiliary systems included in the scope of order 3 4 Many factors such as ducting loads alignment at operating condition place of installation effect of other running blowers in nearby at site may adversely affect the performance of blowers To minimize the influence of these factors the vendor shall visit the purchaser s site and review the site conditions and assess the external forces and moments weather amp Page 1
4. and 10V to 10V AIN1 iv OV to 10V and 0 mA to 20mA AIN2 v both can be used as 7 8 digital input Relay Outputs 3 configurable 30V DC 5A resistive 250VAC 2A inductive load Analog Outputs 2 Programmable 0 4 mA to 20 mA Serial interfaces RS 485 optional RS 232 Motor cable length 7 5KW to 90KW Without output choke Max 50m shielded max 100 m unshielded Protection Level IP 20 Temperature range 7 5KW to 90KW 10 C to 40 C 14 F to 104 F Storage temperature 40 C to 70 C 40 F to 158 F Relative Humidity 95 non condensing Installation height 7 5KW to 9OKW upto 1000m above sea level without derating Page 14 of 16 Protection i Under voltage Features for ii Over voltage iii Overload iv Earth faults v Short circuits vi Stall prevention vii Locked motor viii Motor over temperature ix Inverter over temperature x Parameter PIN protection CE Marking Conformity with Low Voltage Directive 73 23 EEC Dimensions amp H x W x D mm max 520 x 275 x 245 Weight approx kg 17 Max weights 20kg Make The VVVFD should be any one of the Make Eurotherm Schneider ABB Siemens Preferred as Siemens Make VVVFD is already in use in Siemens Make Panel It will make supplied VVVFD to be fit in the old panel without any major modifications 5 Installation and commissioning
5. stainless steel components 4 3 2 To achieve the highest reliability of blower manufacturing latest techniques such as laser cutting for cutting of impeller shroud plates low heat welding techniques for welding of blades to the back plate and shroud etc shall be employed The supplier shall specifically mention the machineries available with them to carryout this work 4 3 3 All welding including repairs shall be performed by welders and procedures qualified in accordance with the specification of AWS D1 1 for housings and structural components and AWS D14 6 for rotating components The weldments on impeller and casing shall be subjected to D P test for the first and final pass All butt welds on rotating elements shall be continuous full strength and full penetration welds 5 General Inspection amp Testing Requirements All details of the characteristic curves calculations amp technical details shall be furnished for the above The blower shall be tested in all cases prior to performance test by the supplier and shall furnish the details of the test to the purchaser for approval of carrying out of performance test 6 Inspection amp Testing at Manufacturer s Works 6 1 Inspection The blowers shall be subjected to inspection to cover dimensional accuracy Page 4 of 16 material used workmanship make and quality of bought out items The supplier shall furnish material test certificates physical chemical amp IGC for purcha
6. ANNEXURE TO TENDER NO DPS MRPU NRPP ENG 4653 TPT 1101 Description of item Design Manufacture Assembly Inspection Shop testing Supply and Installation of Stainless Steel Blowers 4 Nos at TRP Tarapur with base frame vibration isolating pads gas inlet outlet flexible bellows counter flanges with fasteners flexible resilient coupling electrical motors and VFD for largest capacity motor including removal of existing blowers motors and VFDs Note Tenderers who are willing to respond for the subject tender may contact with full details address with phone fax and email on email id spradhan barctara gov in apo2mrpu tndae nic in pomrpu tndae nic in so as to get details of prebid meeting before submission of technical and price bids Technical Specification of Stainless Steel Off gas Blowers 1 Scope The scope of work includes design manufacture assembly inspection shop testing supply and installation of stainless steel blowers as detailed below with base frame foundation vibration isolating pads of polybond Dunlop make gas inlet outlet flexible bellows SS 304L counter flanges with gasket amp fasteners flexible resilient coupling electrical motors and VFD for largest capacity motor Removal of existing blowers motors and VFDs is also in the scope of the vendor 1 1 Performance details with quantity Blower Description Blower type No Type 2000 2150 O E 2 2 Applicable Standards
7. able to the Blowers xvii Terminal Box shall be of adequate size to accommodate cable one size higher than the minimum recommended There shall be provision to change orientation of cable box to suit condition for entry of cable Page 10 of 16 4 Drawings Drawings showing general arrangements frame foundation weight etc shall be submitted along with the technical specifications of the bid Approved drawings shall be obtained from the purchaser prior to the fabrication 5 Inspection amp Testing i The supplier shall perform acceptance amp routine tests for all the motors and type test for one motor as per latest version of IS 325 amp IS 4029 at the motor manufacturer works The test reports shall be submitted to the Purchaser for its review before dispatch ii The supplier shall notify the purchaser the date and location for the tests giving sufficient time for the purchaser or his authorized representative to be present The test procedure shall be approved by the purchaser 6 Packaging All motors shall be properly packed to protect for the entire period of dispatch storage and erection against corrosion incidental damage due to vermin sun light rain high temperature humid atmosphere rough handling in transit and storage hi open including delays in transit 7 Spares Prices of recommended Spares for 3 years trouble free operation shall be mentioned in the bid Page 11 of 16 Annexure IV Datasheet o
8. ally balanced Balancing shall be carried out with impellers mounted on its own shaft while maintaining the actual assembly conditions The balancing grade shall be Gr 2 5 as per ISO 1940 VDI 2060 and the vibration level shall be as per ISO 2372 VDI 2056 Wheel radial amp axial run out shall not be greater than 0 003 X OD Welded counterweights shall not be thicker than base material full radius corners continuous weld min one inch distance from wheel outer periphery All welding of weights to be completed prior to balancing A copy of balancing report showing balance machine calibration amp date initial unbalance final unbalance residual unbalance check weight correction and location shall be submitted to the purchaser The impeller shall be positively locked to the shaft to prevent it from getting loosened Locking device shall be amply designed for full force of sudden start and stop Impeller blades shall be die formed Shrouds back plate shall normally be of one piece construction Blades shall be fully welded to back plate on one side and on other side it will be partially welded and partially plug welded to the shroud However preference will be given to the best design Blades shall be designed and constructed to prevent internal accumulation of condensable foulants or corrosion products The class of construction shall be one or higher grade The minimum thickness of the components shall be 3mm Model testing and FEA shall be carried out
9. ce drawings for each type of blower The manual shall include instructions on alignment lubrication details specifications of parts etc The purchaser shall approve the manual before full supply is made Cleaning Protection and Painting All equipments shall be neatly finished in workmanship like manner All exposed metal surfaces shall be smooth and free from burrs Finished surfaces shall be protected against corrosion and mechanical damage Packaging amp Shipment The blowers shall be shipped to PREFRE stores NRB BARC Complex Tarapur P O Ghivali Dist Thane Maharashtra 401502 only after obtaining a shipping release from the purchaser or his authorized representative The supplier shall be fully responsible for protective measures to ensure the safe delivery of blower s by this specification to the site All the parts shall be packed properly boxed and protected to prevent all possible damage during transportation The supplier shall consult the representative of the purchaser to satisfy himself that adequate measures have taken 13 Installation amp commissioning 14 15 Installation and commissioning will be under the scope of the supplier It includes design detailing and erection of foundation isolation from external effects installation of equipment and connection with existing pipeline After installation performance check of the machine and its drivers will be carried out for meeting the specified acceptance c
10. e i Type of blower drive ii Drive losses in HP and of motor BHP 16 GD2 value kg m2 of impeller 17 Vibration isolator i Manufacturer ii Size iii Numbers 18 Flexible Bellow i Type ii Size iii Bellow thickness iv No of convolutions v Vibration attenuation factor 19 Noise level in decibels 20 Vibration RMS Velocity 21 Shaft Seal i Make ii Type 22 List of spares Page 9 of 16 Annexure Ill Specification of Squirrel Cage Induction Motors 1 Scope This specification covers technical requirements for the design manufacture inspection testing packing for shipment and supply of energy efficient squirrel cage induction motors required as prime movers for and as an integral part of centrifugal type off gas blowers as specified in this document 2 Applicable Standards Latest version of the following standards shall be used IS 12615 Energy efficient 3 phase squirrel cage induction motor IS 325 Specifications for 3 phase Induction Motors IS 1231 Dimensions of 3 phase foot mounted induction motor IS 1271 Thermal evaluation and classification of electrical insulation IS 2253 Designation for types of construction and mounting arrangement of rotating electrical machines IS 3202 Code of Practice for climate proofing of electrical equipment IS 4029 Guide of testing 3 phase induction motors IS 4691 Degrees of protection provided by the enclosure for rotating
11. e of air from blower outlet All bolts studs welded to the casing for end cover or stiffening angles support shall be welded from out side with pad plate Inside surface of casing shall be smooth without any projections of bolt heads etc The casing weldments shall be D P tested for root and final passes If necessary provision for ready access to interiors of casings and other possible trouble points shall be made by means of readily removable bolted on plates or hinged and latched doors Inlet and Page 2 of 16 discharge connections shall be flanged and bolted ASME B 16 5 or 16 47 standard flanges shall be provided Casing shall have drain point at bottom 4 2 2 Mounting The fan amp motor should be mounted on a common base An inertia mass may be provided to restrict the amplitude of vibration Center of gravity must be below the top of the mass Wide flange steel beams with depth equal to greater than the 1 10 of longest span of equipment Vibration Isolators shall be so arranged that load is distributed equally to all isolators to achieve equal static deflection Isolation efficiency shall be minimum 92 Isolator transmissibility ratio shall be less than 0 01 No global frame resonance is allowable within design operating frequency range Make of the vibration isolator shall be Dunlop or Polybond 4 2 3 Impellers Impeller blade design shall be radial type solid blades of minimum 6mm thick Impellers shall be both statically amp dynamic
12. e on all drives This device shall incorporate a lateral adjustable base with guides and hold down bolts two belt tensioning screws and locking bolts To reduce bearing moment loading the sheave overhang distance from sheave to shaft bearing shall be minimized Sheave runout shall be less than 0 002 inch radial and axial direction Sheaves shall meet the balance requirements of ISO 1940 VDI 2060 Grade 6 3 Pulley shall be FENNER make Taper lock bushing 4 2 8 Flexible Bellows All blowers shall be supplied with a pair of stainless steel bellow suitable for inlet and outlet connections with counter flanges nuts and bolts Supporting design calculations and selection for number of convolutions and thickness shall be furnished to the purchaser All blowers shall be supplied with bellows face welded to flanges 4 2 9 Lifting Provision Suitable lifting lugs shall be provided with each type of blower for handling during installation and maintenance as well 4 2 10 Drive Motors The prime movers for blowers shall be of squirrel cage type induction motors with rating as per Table IV of API standard 673 Refer Annexure lll 4 2 11 Spare Parts The supplier shall quote separately for spare parts of blower for trouble free service for at least five years However it will be at the purchaser s discretion whether to buy it or not 4 3 Fabrication 4 3 1 The work shall be carried out in clean and dust free environment so as to avoid contamination of
13. electrical machinery IS 4722 Rotating Electrical machines IS 4728 Terminal marking and direction of rotation of rotating electrical machinery IS 4800 Enameled copper winding wires IS 12075 Specifications for limits of vibration of the motors IS 12802 Temperature Rise Measurement of rotating Electrical machines IS 12824 CBIP Recommendation of Motors 3 Technical Specifications i Make M s Bharat Bijlee M s ABB M s Siemens ii Type of enclosure T E F C IP 55 as per IS 4691 amp degree of protection iii Type of Duty Continuous iv No of phases 3 phase v Rated Voltage 415 V 10 vi Frequency 50 Hz 5 vii Class of Insulation F Temperature rise limited to class B viii Speed of Revolution Shall be compatible with Blower ix Earthing Two nos of earthing terminals of proper size shall be provided x Rotor Squirrel Cage xi Control of Speed Variable Voltage Variable Frequency Drive xii F L Starting current Not exceeding 600 of FL current DOL Starter xiii Winding Copper wound Inverter Grade VFD Compatible xiv Fault Capacity of System to which motor is to be connected 35 MVA xv Motor is driven by VWF drive which will introduce harmonics Motor should be designed to withstand temperature rise due to harmonics Motor winding shall have nos of Thermal switches of proven performances to trip motor in case temperature exceeds preset limit xvi Rating of motors shall be suit
14. f LT Squirrel Cage Induction Motors for Blower To Be Furnished along with offer 1 Make 2 Applicable Standard 3 Type of enclosure amp degree of protection 4 Type of Duty 5 No of Phases 6 Voltage amp Frequency with variation 7 Class of Insulation 8 Frame Size 9 Rating in KW 10 Speed of Revolution 11 Direction of Rotation 12 Earthing 13 Rotor 14 F L Starting current FL 15 Fault Capacity of System to which motor is to be connected 16 Torque Speed Characteristics 17 Thermal Withstand Capacity 18 Temp Rise of Winding 19 Temp Rise of Bearing 20 Degree of Protection 21 Fault Withstand capacity amp Duration 22 Thermal Switch for Motor winding a Make b Contact rating c Insulation Resistance d Temp Setting 23 Type Test Certificates 24 Winding Connection a Stator b Rotor 25 Whether Suitable for being controlled by VWF with Total Harmonic Distortion upto 5 in both Voltage and Current 26 Recommended Cable Size 27 Terminal Box Dimensions Page 12 of 16 Annexure V Specification of Variable Voltage Variable Frequency Drives 1 Scope This specification covers the inspection amp testing manufacturer s works and supply installation amp commissioning of Variable Voltage Variable Frequency AC Drive VVVF Drives required for speed control of 3 phase squirrel cage induction motors specified in this document for largest capacity Centrifugal Blowers to maintain the ups
15. he panel make is Siemens The supplied VVVF Drives should be compatible with existing panel and its rating should be higher enough to drive the supplied motor and fan The supplied VVVFD shall be fitted in the existing panel without doing any major modifications The supply of input filter choke along with VVVF Drive is in the scope of the supplier Page 13 of 16 4 Technical Specifications of VVVFD Specification Technical Data Input Voltage 380 to 480V 10 3AC Power To Suit the Motor and Fan Input Frequency 47 Hz to 63 Hz Output Frequency 0 Hz to 650 Hz Power Factor 20 95 Invertor efficiency 96 to 97 Overload Capability Overload current 1 4 x rated output current i e 140 overload capability for 3s and 1 1 x rated output current i e 110 overload capability for 60s cycle time 300s Inrush current Less than rated input current Control method Linear V f characteristics quadratic V f characteristics multi point characteristic programmable V f characteristics flux current control FCC energy saving mode Pulse frequency 4kHz standard 2kHz to 16kHz in 2kHz steps Fixed Frequency 15 programmable Skip Frequency bands 4 programmable Set point resolution 0 01 Hz digital 0 01 Hz serial 10 bit analog Digital Inputs 6 fully programmable isolated digital inputs switchable PNP NPN Analog Inputs 2 Programmable Analog inputs iii O V to 10V OMA to 20mA
16. o obtain 0 002 to 0 003 inch foot flatness Anti friction bearings shall be grease lubricated The vendor shall perform a thermal analysis of the bearings taking into account the heat conducted by the shaft and maximum specified ambient temperature The lubrication method will be reviewed and approved by the purchaser The vendor shall provide in the service manual a lubricant specification a recommended re lubrication interval and a recommended clean and repack interval for the specific application Bearing housing shall have a threaded connection for permanently mounting vibration transducers in accordance to API 670 Page 3 of 16 4 2 6 Shaft Seal Out side mounted unbalanced multi spring mechanical seal shall be offered for all the blowers The seal material shall be compatible for the service fluid i e air with acidic fumes The seal shall be of reputed make proven design and shall be approved by the purchaser Material for mating surfaces SiC hardware stainless steel and secondary seals PTFE 4 2 7 Power transmission V belt drive suitable to transmit the required power shall be provided to all blowers All belts shall be oil resistant and shall be of static conducting type The service factor shall not be less than 1 75 times the driver name plate power rating The V belt drive shall be suitable for the operating speed specified and shall facilitate ease of assembly amp maintenance The vendor shall provide a positive belt tensioning devic
17. of 16 environmental conditions and shall ensure that these effects will not affect the performance of blower 3 5 The design shall be such as to select blower for optimum static amp mechanical efficiency The blower shall have stable operation in the range of 20 to 110 of the rated capacity 3 6 Blowers shall preferably be of single stage design In case more then one impeller is needed to achieve desire static proper justification for its selection shall be provided 3 7 Operating speed of the blowers shall be less than 2500 rpm The critical speed of the blower shall be at least 1 5 times the operating speed The operating speed range shall be 20 to 105 of maximum speed The vendor shall determine that the drive train critical speeds will not excite any critical speed of machinery being supplied The entire drive train shall be suitable for operation in the specified operating speed range A list of all undesirable speeds from zero to trip shall be submitted to the purchaser for review 3 8 The blower shall be suitable for exhaust air at 50 deg C and containing low concentration of nitrous corrosive fumes 3 9 The discharge and inlet of the blowers shall be circular In case if it is rectangular transition piece shall be provided It shall have suitably drilled flanges for ease of flexible bellow connections and it shall be rounded off to next higher nominal sizes of standard pipes and flanges meeting the standards 3 10 Base plate amp
18. of VVVFD The installation and commissioning of the VVVFD is in the scope of the supplier The VVVFDs will be installed in the existing panel in the place of existing Siemens make VVVFD without any major modifications in the panel The commissioning of the VVVFD shall be done by the qualified personnel from the manufacturer or its authorized service centre 6 Applicable Standards IEC IEEE Standard 7 Inspection amp Testing 7 1 All tests necessary to assure conformity with technical specifications for VVVF Drive shall be carried out 7 2 The supplier shall perform Acceptance and Routine Tests for all VVVF Drives as per relevant standards These test reports shall be submitted to the Purchaser for its review before dispatch of the drives 7 3 The supplier shall notify the purchaser the date and location for the tests giving sufficient time for the purchaser or his authorized representative to be present The test procedure shall be approved by the purchaser 7 4 The supplier shall demonstrate to the purchaser the successful run of complete VFD Motor Blower assembly to meet the requirements of this technical specification 8 Packaging a VVVF Drives shall be protected for ocean shipment inland transport carriage at the site and out door storage transit at the site b Supplier shall be responsible for any damage to the items during transit due to improper and inadequate packing c Only packages constructed out of suitable material and
19. of dimensions proportional to the size and wt Of contents shall be used d All items shall be protected for the entire period of dispatch storage and ejection against corrosion incidental damage due to vermin sun light rain high temperature humid atmosphere rough handling in transit and storage in open including delays in transit 9 Transport a No material shall be dispatched without prior consent of the purchaser or hi representative b Supplier shall intimate in writing the probable date when the equipment shall be ready for dispatch at least within 10 days for foreign supply and five days for domestic supply in advance Page 15 of 16 10 It is not the intent to specify here the complete details of design and construction of the VVVEF Drives required for Off Gas Blowers However VVVF Drives shall conform to the high standards of engineering design and workmanship and be capable of performing in continuous operation up to the seller s guarantee in a manner acceptable to the purchaser who will interpret the meaning of drawings amp specifications and shall have the power to reject any work or material which in his judgment are not in full accordance with specifications 11 Spares Prices of recommended Spares for 3 years trouble free operation shall be mentioned in the bid Annexure VI Datasheet of Variable Voltage Variable Frequency Drive VVVF To Be Furnished along with offer 1 Make 2 Applicable Standard a
20. or OEM authorized dealer shall have to show already supplied and installed by them the blower of similar type and capacity which has vibration and noise level less than or equal to the limits mentioned in the technical specifications and offer shall contain performance certificate from user Failing to do so will result into outright rejection of offer Since the item is being procured for critical application after sales services support from the OEM is most important requirement for us In view of this offers from OEM or authorized dealers preferred channel partners of OEM only will be considered In case OEM is unable to quote directly a letter marked to the department confirming the competence and experience of the bidder in handling supply amp after sales services support from the OEM must be submitted This is to ensure proper and timely supply of the material and uninterrupted after sales service support Offers without OEM authorization letter as said above will be outright rejected Page 7 of 16 Annexure Specific Requirements of Blower 1 Blower Characteristics Operating Fluid Operating Fluid temperature Duty Operating speed rpm Range of Operation Shaft seal Shaft Bearing Oo MONOD OA KR WD Impeller balancing 10 Vibration level RMS Velocity 11 Noise Level 12 Bearing Temperature 13 Bellows Performance details with quantity Sr Description Blower type a et 1 Capaci
21. ower in operation shall be recorded to determine the noise level of the blower Maximum noise level shall not exceed 80 dB 6 2 5 Each blower shall be run continuously for six hours or till the bearing temperature stabilizes During this the bearing temperatures motor current supply voltage etc shall be monitored 6 2 6 Performance tests of all the blowers will be carried out at suppliers works as per AMCA 210 Performance Guarantee Supplier shall give performance guarantee for the blowers running under the specified condition and shall replace any part in the event of failure due to design and manufacturing faults for a minimum period of one year from the date of installation 8 Documents Drawings amp Data to be Furnished with Offer Supplier shall submit catalogues drawings and the followings along with the offer Blower datasheet as per annexure l Price schedule amp Schedule of recommended spares as per annexure ll General arrangement drawing with major dimensions Part list with codes and material of construction Performance curve with duty point marked Selection charts or curves List of similar orders executed for various DAE units with its reference Quality assurance programme 9 Documents to be Submitted after Award of Contract After receipt of purchase order the supplier shall submit to the purchaser for his approval 4 copies of the certified dimensional drawings of the blower motor assembly charac
22. riteria The performance will be observed for atleast three months and its parameters should be within acceptable limits Drawings All the drawing shall be made on computers using latest version of Auto Cad software and shall be submitted along with delivery Vendor Evaluation Criteria The following information is to be submitted along with the offer for evaluating the vendor 1 Annual turnover of the company Similar orders executed preferably within DAE unit Performance report submitted by the user for the executed orders A separated dedicated facility for SS machining and fabrication like storage workshop tools equipments etc CNC machines to carry out precision machining of components Advanced low heat welding equipments for welding of SS components Test rigs for conducting blower performance test as per AMCA requirements Latest instruments to measure the critical parameters like surface finish linearity alignment balancing vibration noise etc AON ONDU Page 6 of 16 16 General 1 The installation work will be in radioactive area 2 First order for one blower will be given and its performance will be observed at site after installation for period of three month The order for the remaining blowers will be given after satisfactory performance of the first blower 3 Supplier shall quote spares for five years of trouble free operation 17 Essential Criteria for vendor for qualifying in Part The vend
23. ser s review Cross examination will be carried out by the purchase and if necessary involvement of third party will be arranged by the supplier and charges will be under their scope The supplier shall also furnish all the relevant test certificates on bought out items A detailed QAP and time related chart indicating different stages of work shall be submitted to the purchaser for approval Supplier shall inform well in advance the different stage of the work progress for stage inspection as per the approved QAP Run Test This test shall be carried out on each unit at manufacturer s work to examine vibration amp noise after assembly 6 2 1 Prior to rotor assembly the shaft shall be inspected for mechanical run out and concentricity at impeller mounting surface and bearing journal Total indicator reading shall not exceed 50 25 microns as per 2 7 4 1 of API standard 673 6 2 2 After the final balancing of each assembled rotating element has been completed residual unbalance check shall be performed and recorded and residual unbalance shall not exceed the values for balance grade G2 5 6 2 3 Each blower unit shall be run at various speeds The amplitude amp frequency of vibration shall be measured at various locations on the blowers The maximum allowable unfiltered peak amplitude of vibration in any plane shall not exceed the limits specified in table 2 of API standard 673 6 2 4 Background level of noise Db amp noise level with bl
24. teristics curves for blowers and motors considering minimum and maximum ambient temp minimum and maximum humidity minimum and maximum frequency materials of construction make type specification of motor bearings Flexible coupling shaft seal etc and design information to support the correctness of selection on bearing shaft critical speed Detailed to scale dimensioned general arrangement drawing of blower and motor giving foundation details loading data like static and dynamic loads unbalanced forces and moments if any pocket details etc Overall space and headroom requirement with details of handling during erection operation and maintenance of the equipment The fabrication and use of the parts shall start only on receipt of purchaser s Page 5 of 16 10 11 12 approval on these Also the supplier shall furnish a detailed schedule of manufacture amp delivery Final Documentation The supplier shall furnish 5 copies of inspection documents along with instruction manuals Five copies of documents pertaining to inspection and testing containing material test reports stage inspection reports radiographic report if any performance report balancing report motor test report VFD drive test report etc shall be submitted along with delivery of the blowers Soft copy of drawings and manual shall also be submitted in CDs The supplier shall furnish 5 copies of instruction manuals to cover installation operation and maintenan
25. to determine fan resonance structural resonance critical speed etc 4 2 4 Shaft Shaft of the blower shall be amply designed to take up the various torque and bending moments of the total system It should be well designed with fillets amp radii to take discontinuous stress at various section changes The shaft shall be finished to close tolerances at impeller seal bearing and pulley diameters The size of shaft shall be calculated on the basis of combined shear stress This shear stress shall not exceed 30 percent of elastic limit in tension or 18 percent of ultimate tensile strength The shaft shall be UT tested as per ASTM A 503 609 Raw material test for checking chemical properties for shaft material shall be carried out Shafts shall be of one piece hot rolled steel heat treated after machining The shaft shall be stress relieved after rough machining 4 2 5 Bearings The bearing of the shaft shall be of anti friction type of original SKF make Independent plumber blocks for housing two bearings shall be provided Bearings selected shall be designed for the life of at least 1 00 000 hours and capable to take necessary radial load and net axial thrust Bearing housing shall be of original SKF make and rest on machined surface and properly located by dowels The bearing support plate shall not exhibit structural resonance within the operating speed range of fan Minimum thickness of bearing support plate shall be 1 inch and shall be machined t
26. tream vacuum of the system Sr No Description No of drives Type II 1 Quantities 2 2 Functional Requirements VVVF Drives selected should meet the following functional requirements The VVVF Drive shall be capable to operate the blowers up to 110 of blowers rate capacity by increasing the speed of the blowers if need arises It should also be able to operate as low as 20 of the rated capacity of the blowers 3 General Specifications of VVVF Drives a Variable Voltage Variable Frequency Drive VVVF Drive shall be air cooled static speed controller using IGBT having total harmonic distortion not exceeding 5 b These Drives used for speed control of 3 phase squirrel cage induction motors coupled with centrifugal Blowers used in Off Gas System in order to control upstream vacuum of the Off Gas System by varying the frequency and voltage applied to the motor terminals e It shall have provision for digital indication for Measured Variable MV Set Point S and Output f It shall have in built RFI filter and AC choke for harmonics suppression g It shall have both lockable local amp remote operation facility h Drive shall have alphanumeric control panel with LCD indications of all essential parameters like output frequency voltage current etc i Presently Siemens Make VVVF Drives of Type Micromaster 430 Rating 18 5kW 38A Code 6SE430 2UD31 8DA0 are being used for driving 15kW Motor T
27. ty CMH 1000 Static Pressure mm WC 1725 3 Quanity hos 2o p Centrifugal type Radial blade with SISW Arrangement 1 preferably single stage Gas containing nitric acid fumes 50 Deg C Continuous Heavy duty Below 2500 rpm 20 110 of rated Capacity Mechanical seal Original SKF make As per VDI2060 G 2 5 conforming to IS01940 1 As per VDI 2056 Less than 3 0 mm sec Below 80 dBA Ambient 40 Deg C max Spring rate 4 Kg mm Page 8 of 16 Annexure Il Blower Datasheet To be furnished by bidder along with the offer Manufacturer and model no Type Numbers Blower rated speed rpm Performance i At air standard density at 760mm of Mercury and 20 deg C temperature and at rated speed ii At operating temperature 50 Deg C 6 Outlet velocity m min 7 Critical speed rpm 8 Air B H P i B H P required at rated speed at 50 Deg C ii B H P required at rated speed at 20 deg C 9 Limit load BHP 10 Static efficiency percentage 11 Details i Wheel diameter mm ii Blower tip speed m s iii Blower outlet area m2 iv Temp rise deg C 12 Overall wheel width mm 13 Materials and their thickness ROND Sr No Item Material Thickness Dia Sr No Item Material meter mm Thickness Dia meter mm i Casing iv Impeller i Back plate V Gaskets il Shroud vi Shaft 14 Blower Bearing i Type ii Size ili Life 15 Blower driv
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