Heat resistant electric-insulating coating for steel tubes in heating installations

1963 ◽  
Vol 20 (2) ◽  
pp. 98-100
Author(s):  
N. I. Voronin ◽  
N. I. Krasotkina ◽  
V. F. Yudin
Keyword(s):  
Steel Tubes ◽  
Heat Resistant

Magnetic evaluation of the external surface in cast heat-resistant steel tubes with different aging states

2018 ◽  
Vol 456 ◽  
pp. 346-352 ◽  
Author(s):  
Mónica P. Arenas ◽  
Rosa M. Silveira ◽  
Clara J. Pacheco ◽  
Antonio C. Bruno ◽  
Jefferson F.D.F. Araujo ◽  
...  
Keyword(s):  
External Surface ◽  
Resistant Steel ◽  
Steel Tubes ◽  
Heat Resistant Steel ◽  
Heat Resistant

PYROLYSIS OF THE LOWER PARAFFINS: V. THE CONVERSION OF THE GASEOUS PARAFFINS TO AROMATICS IN BAFFLED METAL TUBES AND THE CHEMICAL COMPOSITION OF THE PRODUCTS

1934 ◽  
Vol 10 (2) ◽  
pp. 145-163
Author(s):  
Adrien Cambron ◽  
Colin H. Bayley
Keyword(s):  
Chemical Composition ◽  
Turbulent Flow ◽  
Alloy Steel ◽  
Nickel Alloys ◽  
Gas Flow ◽  
Thermal Conversion ◽  
Chemical Methods ◽  
Steel Tubes ◽  
Heat Resistant ◽  
Light Oil

The thermal conversion of propane to aromatics has been investigated by passing the gas through externally heated alloy steel tubes under conditions of turbulent flow. Recycling experiments carried out under pressure have shown that, when the gas flow is turbulent, high rates of conversion can be obtained at temperatures as low as 800–810 °C. Heat resistant chromium-nickel alloys of the 18:8 type have been found unsuitable for this purpose owing to the catalytic formation of carbon. Yields of 23.3 lb. of light oil per 1,000 cu. ft. of propane put through were obtained at 800 °C. together with 10 lb. of liquids boiling above 200 °C. The composition of the liquids obtained in these experiments has been determined by fractionation and chemical methods. The light oil obtained under the above conditions contains about 64% benzene, 14% toluene, 7.8% styrene and small amounts of cyclopentadiene, xylenes and higher aromatics. The liquids boiling above 200 °C. contain about 25% naphthalene and 12.5% anthracene together with smaller amounts of mono- and dimethyl naphthalenes, acenaphthene and phenanthrene.

PYROLYSIS OF THE LOWER PARAFFINS: III. PRODUCTION OF OLEFINES IN BAFFLED METAL TUBES

1933 ◽  
Vol 9 (6) ◽  
pp. 583-590 ◽  
Author(s):  
Adrien Cambron ◽  
Colin H. Bayley
Keyword(s):  
Thermal Treatment ◽  
Alloy Steel ◽  
Steel Tubes ◽  
Heat Resistant ◽  
Special Alloy Steels ◽  
Special Alloy ◽  
Alloy Steels ◽  
Elementary Carbon

Results have been obtained which indicate that the conversion of the lower paraffins to olefines by thermal treatment can be satisfactorily carried out in special alloy steel tubes at 800–820 °C. By using baffled tubes it has been found possible to obtain high rates of conversion at temperatures considerably lower than when using open tubes. Actually the temperature has been brought within the range of usefulness of special alloy steels. Heat-resistant alloys of the 18–8 type have been found unsuitable for this purpose, because nickel appears to catalyze the formation of elementary carbon, but nickel-free alloys containing over 20% of chromium have been found satisfactory.

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