instruction manual - BHEL Bhopal
instruction manual - BHEL Bhopal
instruction manual - BHEL Bhopal
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Use only dry Nitrogen gas to IS:1747 with 50 ppm moisture and 1%<br />
oxygen by volume.<br />
If the storage time exceeds 3 months, the transformer is filled with oil<br />
according to directions given in clause 2.5. If for some reason oil filling is not<br />
possible, then nitrogen must be continuously maintained at a positive pressure.<br />
Measures to be taken on receipt at site are given in clause 2.1.<br />
1.2.3 INSTRUCTIONS FOR FILLING DRY PURE NITROGEN GAS WITH<br />
BACK UP CYLINDERS (AT WORKS)<br />
Lower the oil level to the minimum necessary to dismantle the items<br />
(such as bushing and turrets) which must be removed for shipping.<br />
Pull 500 mm mercury vacuum after blanking off all openings.<br />
Break the vacuum by admitting dry nitrogen through a convenient valve<br />
at the top of the tank and drain the oil completely.<br />
Continue to supply nitrogen until it maintains a steady pressure of 0.17<br />
± 0.02 kg/cm 2 above the atmosphere.<br />
Pressure of nitrogen gas shall be maintained at 0.17 ± 0.02 kg/cm 2 at<br />
same reference temperature. Pressure would be monitored by taking three<br />
readings within 24 hours to ensure that there is no leakage of gas.<br />
Shut off the gas supply valve and fit dry nitrogen back up cylinders<br />
through nitrogen regulator valve.<br />
Prepared By Samvet Lahari, <strong>Bhopal</strong>. Phone- 5277412
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