9.7.1 A method should be devised to test the correct
                           functioning of all units and alarms and it may be necessary to simulate
                           certain conditions to carry out an effective testing programme.
                        
                        
                        
                      
                     
                     
                     
                        
                        
                         
                           9.7.2 Such a programme should include checking:
                        
                        
                        
                        
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                                 .1 all alarm and safety functions;
                               
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                                 .2 the functioning of the flue gas isolating valves;
                               
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                                 .3 the operation of all remotely or automatically
                                 controlled valves;
                               
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                                 .4 the functioning of the water seal and nonreturn
                                 valve (with a backflow pressure test);
                               
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                                 .5 the vibration level of the inert gas blowers;
                               
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                                 .6 for leakages: in systems four years old or
                                 more, deck lines should be examined for gas leakage;
                               
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                                 .7 the interlocking of the soot blowers;
                               
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                                 .8 oxygen measuring equipment, both portable and
                                 fixed, for accuracy by means of both air and a suitable calibration
                                 gas.