portable x ray machine for non destructive testing

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PORTABLE DIRECTIONAL X-RAY EQUIPMENT (for non destructive testing) General specification of the equipment will be as follows, suppliers will be asked to quote their nearest model to these specifications: BASIC EQUIPMENT: (i) Output voltage: 150 – 300 kV (ii) Current: 1 – 5 mA (iii) Focal spot: 2 – 2.5 mm square (iv) Insulation: SF6 gas (v) Penetration: 46 mm steel (should be able to detect weld joint cracks, slag inclusions, blow-holes etc) (vi) Filtration: 2.5 – 3 mm Al (to filter out soft x rays from the hard x rays) (vii) Beam Angle: 40 degree cone (viii) Weather proofing: IP65 to DIN:60529 (protection against dust and water) (ix) Duty cycle: 85% (x) Power requirement; 220+/-10% V AC, single phase, 50 Hz (xi) Temperature cut off: 75 degree C (xii) Maxm exposure time: 10 – 12 minutes (xiii) Cooling: Water/ Air cooled (xiv) Power supply cable: 10 m long (xv) Interconnecting cable: 20 m long (xvi) Approximate size: 220 mm dia x 820 mm length (excluding carrying rings) (xvii) Approximate weight: 50 kg ACCESSORIES (i) Beam limiting diaphragm (ii) Centering device (iii) Telescopic pointer (iv) Focussing light for the center CONTROL PANEL FEATURES Mandatory features (i) Selector switches and meters for 150 kV to 300 kV and 1mA to 5 mA operation (ii) Sockets for safety interlocks for door, warning lamps etc. (iii) Emergency exposure stop switch (iv) Anode and cathode overload protection (v) Over temperature cut off (vi) Over voltage protective circuit (vii) Pre warning exposure control (viii) Red warning lamp for X ray on (ix) Indicator lamp for standby and tube hot stage (x) Key lock power on-off Preferred features (i) Automatic timer : 1 – 999 seconds (ii) Manual or automatic exposure control for repetitive exposures (iii) Microprocessor based circuitry matching to high voltage transformer (iv) Digital displays (v) Digital keypad to select kV and mA values (vi) Memory for 5000 exposures which can be downloaded on a PC. TEST REPORT (i) Manufacturer should submit their standard test chart/ calibration report before dispatching the equipment. (ii) They should take photograph of 46 – 50 mm thick steel sample with known defects ( crack, slag inclusion, blow hole etc) and ascertain the effectiveness of the equipment to carry out non destructive testing. INSTALLATION, COMMISSIONING, TRAINING (i) Will be done by an authorized representative of the manufacturer. TERMS AND CONDITIONS (i) Supplier should reply to the clauses mentioned in “Terms for Purchase of Capital Goods” enclosed with the enquiry. Approved By: Dept Sign Date FPIG: S. Chatterjee 25.10.06 QA: S. Bose MAINTENANCE: S.S. Joshi 26.10.06