TECHNICAL SPECIFICATIONS FOR BOLT HEATING EQUIPMENT

Transcription

1 III IV. Annexure-1 TECHNICAL SPECIFICATIONS FOR BOLT HEATING EQUIPMENT I- INPUT & OUTPDUT Rated Power : 95 / 125 KVA at 50% duty cycle. Primary Voltage : 415V, 2 Phase, 50 Hz Secondary Voltage : 12.5 Volts (max.) Primary Current : 300 Amps (max) Secondary Current : 10 KA at 50% duty factor Current adjustment : Adjustable through potentiometer Cable : 2-1/2 Core, 150 Sq. mm copper flexible, 25 mtrs. Long. Duty cycle (continuous) : (a)8 mts. ON 15 mts. OFF at 10 KA load (b)30 mts. ON 15 mts. OFF at 5 KA load Output cable : 3.5 mtr. Long, 300 sq. mm water cooled cable with Water cooled output electrodes. II- METERING: 1- Input AC Ammeter 2- AC voltmeter across heating transformer primary winding. 3- AC Voltmeter across heating transformer secondary winding 4- Water pressure gauge. CONTROLS: 1- Input Switch fuse unit 2- Control ON/IOFF switch 3- Water flow switch ( 2 Nos; one at inlet & one at outlet) 4- Timer ON/ OFF switch 5- Timer PROTECTION 1 Input fuse 2 Control fuse 3 Surge suppressor for thyristor 4 Thermal switch for thyristor 5 Thermal switch for transformer 6 Electronic over load / cut off V. INDICATION 1- Input supply ON 2- Control supply ON 3- Over load 4- Water flow low 5- Thyristor temperature high 6- Transformer winding temperature high

2 7- Timer trip. VI. WATER COOLING 1. Minimum water pressure : 1.5 Kg/cm2 2. Maximum water pressure : 5 kg/cm2 3. Minimum water flow : 6-8 LPM 4. Quality of water : Non-Salty, Non Corrosive Normal drinking water 5. Air tightness : 5 Kg/ Cm2 for 30 minutes VII. ENVIRONMENT: 1. Ambient 0 to 45 o C 2. Humidity 0 to 95 oc 3. Altitude : up to 1000 mtrs.

3 ANNEXURE-A DGM (Mtls), National Fertilizers Ltd., Nangal Unit, Naya Nangal UNDER TA KIN G Sub: Your Tender Notice No. ST/2012/9 DUE ON for Supply of Bolt Heating Equipment. Dear Sir, With reference to above we hereby confirm that- 1. Tender documents have been read, understood with all clarifications pertaining to various clauses provided therein. 2. Terms & conditions laid out in the tender documents are fully acceptable to us and we have signed each page of the tender documents as a token of acceptance of the same. 3. No deviation to any of the terms & conditions of NIT has been quoted by us. 4. Our offer is valid for acceptance for a period of 90 days from the date of opening. 5. Earnest Money Deposit is enclosed with the following details (in case, the EMD has been deposited through more than one DD the details may be furnished separately. DD No. Dated Amount Drawn on (Bank) payable at Naya Nangal/ Nangal 6. Rates quoted are on FOR, NFL Stores basis and the rates including transportation charges shall remain firm till the complete execution of the order. 7. This is to certify that none of the NFL employees is related to us. (In case any relative is working NFL, furnish details separately). 8. That no other firm/ sister concern / associate belonging to the same group is participating / submitting this tender. 9. That the bidder s, their associates, sister concern, etc. have not been black listed by any Institutional agency/ Govt. Deptt. / Public sector undertaking in the last two years. In case of concealment of any fact, if detected later on such tenderer will be debarred from all future dealing with NFL. Dated: Place: Signature of Tenderer or Their Authorised Representative: Name & Address of Tenderer: PHONE NO.: FAX No. : E.Mail :

4 PROFORMA FOR PRICE BID ANNEXURE-B The DGM (Matls.) National Fertilizers Ltd., Nangal unit, Naya Nangal PIN (P.B) Sub:- Your Tender No. ST/2012/9 DUE ON for Supply of Bolt Heating Equipment. Dear Sir, With reference to above-mentioned tender, we hereby submit our Price Bid for subject material as under: - Sr. Description Unit Qty. Rates / Unit No. in figure 1. Cost of Bolt Heating Equipment No. 1 Rates / Unit in words - Packing & Forwarding Charges :- - Excise Duty including Cess :- - CST/VAT/Service Tax :- - Prices- EX-works/FOR Destination :- - Freight Charges ( if any) :- - Other levies & Duties ( if any) :- - Validity of offer from :- Tender opening date - Delivery Period :- - Payment Term :- - MSMED Act Status :- (Micro/Small/Medium) - Our Liquated Damages Clause :- (Accepted / Remarks) - Our Guarantee / Warrantee Clause :- (Accepted / Remarks) Dated: Place: Signature of Tenderer or Their Authorized Representative: Name & Address of Tenderer: Phone No: Fax no.:

5 ANNEXURE-II ELIGIBILITY CRITERIA The price bids of only such eligible tenderers shall be opened whose offer meet the NIT specifications and also fulfill the following:- 1. Vendor should be manufacturer for similar Bolt Heating Machines for the last three years ending 31 st March Vendor should have executed minimum of TWO (2) PO s for similar Bolt Heating Machine during last 10 years ending 31 st March Vender shall submit at least one satisfactory performance report of the similar Bolt Heating Machine supplied by them during last 10 years ending 31 st March The vendor shall have to furnish Last 3 Years Balance Sheet/ Audited results/profit & Loss account (ending 31/03/2012). Definition of Similar Bolt Heating Machine: Machine which suits the Application, matches the Function of Equipment & Mode of Operation as described below: APPLICATION: The joint Flange bolts of turbines need considerable pretensioning because of the longitudinal expansion which occurs under operating conditions. This pretensioning of bolts can be achieved by either: The application of suitably high mechanical force to the bolts when cold or heating the bolts and screwing down the nuts while in this condition. The joint flange bolt heating unit is used for heating the bolts to allow the subsequent screwing down the nuts to give required preloading. The heating effect is generated by passing down the nuts to give the required preloading. The heating effect is generated by passing a high electric current through the bolt to be expanded (Resistance heating). FUNCTION OF THE EQUIPMENT: The function of the heating transformer is to convert the available mains current into a current suitable for the heating process. This current is then fed to the ends of the bolts through water-cooled leads and electrode. MODE OF OPERATION AND DESCRIPTION OF THE UNIT: The unit is connected to the mains by a power supply cable: Actuating the ON/OFF toggle switch on the front panel connects the primary side of the TRANSFORMER to the mains through water-cooled thyristors. The high primary voltage is stepped down to a lower secondary voltage. The THYRISTORS, the HEATING TRANSFORMER and the SECONDARY LEADS are WATER-COOLED and have flow monitors. The current flowing in the secondary-circuit, which depends on the series resistance s in this circuit (leads, electrodes, bolts), heats the bolts to the required temperature in approximately 2 to 10 minutes. (Documents in support of the above must be submitted along with Techno-Commercial Bid i.e. Part-I)