Corrosion in Fertiliser and Petroleum Industry: Proceedings of Short Course on "Corrosion in Fertiliser and Petroleum Industry" Organised by the Corrosion Advisory Bureau at Udyogamandal from 20th to 24th December 1968K. N. P. Rao, A. K. Lahiri |
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Page 136
... concentration to start with but the threshold limit below which the concentration should not be allowed to fall is 120 ppm . It is economical to produce the chromate by mixing sodium - dichromate and caustic soda in the proportion of ...
... concentration to start with but the threshold limit below which the concentration should not be allowed to fall is 120 ppm . It is economical to produce the chromate by mixing sodium - dichromate and caustic soda in the proportion of ...
Page 137
... concentration of 50 ppm ( as P2O5 ) and calcium or zinc at a concentration of 30 ppm . This method of inhibition is effective over a range of flow velocity from 0.04 to 7 ft . per sec . , and at the latter speed the rate of attack at ...
... concentration of 50 ppm ( as P2O5 ) and calcium or zinc at a concentration of 30 ppm . This method of inhibition is effective over a range of flow velocity from 0.04 to 7 ft . per sec . , and at the latter speed the rate of attack at ...
Page 138
... concentration rises about 0.4 ppm . Concentration by evaporation may increase the original chloride and sulphate content to a level as high as 10 times the original value . Corrosion may be retarded by the addition of lime and make the ...
... concentration rises about 0.4 ppm . Concentration by evaporation may increase the original chloride and sulphate content to a level as high as 10 times the original value . Corrosion may be retarded by the addition of lime and make the ...
Contents
INTRODUCTION | 3 |
CHEMICAL CORROSION AND ITS PREVENTION | 13 |
CORROSION PROBLEMS IN THE MANUFACTURE OF NITROGEN BASED FERTILIZER | 27 |
9 other sections not shown
Common terms and phrases
addition alloys aluminium ammonia ammonium amount anodic application attack bottom carbon steel cast iron cathodic protection cause chemical chloride chromium coatings concentration construction containing cooling corrosion problems corrosion rate cracking crude developed distillation effective environment epoxy equipment exchangers failure fertiliser flow formation give given handling heat higher hydrogen hydrogen sulphide increase industry inhibitor iron lead material metal method mild steel Monel months natural observed occurred operating organic oxide oxygen paint petroleum phosphate pipe pitting plant plates potential practice presence pressure prevent pumps range reaction reduced refinery removal resistance rubber severe shell showing solution specially stainless steel steam storage tanks stress corrosion structure suitable sulphuric acid surface Table tanks temperature tests thickness tower treatment tubes unit various welding zinc