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By Alice E Beetz; Appropriate Technology Transfer for Rural Areas (Organization)

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Complex manifolds. tube sheets. tube supports. and tube hangers. These are required also in heat resisting alloy grades. Modern petrochemical standards demand levels of cast surface smoothness almost unattainable by traditional foundry techniques; especially in the bore of cast bends where grinding is not always 35 possible. Similarly, casting must achieve high standards of "soundness" (freedom from porosity) and "cleanliness" (freedom from non-metallic inclusions). This has been achieved by modernising foundry practices as follows:1.

Slater, D. , Materials Technoly Symposium (1964) 11. I. RP 530 12. 40 Steel Tube for use in Reformer Furnaces" (SCH-SSCF), National Research Institute for Metals, Japan, Creep Data Sheet No. 16A 13. , Puroshothaman, S. , Scriptam Metallurgica, Vol. 11 (1977) 14. , ASME Conf. (1986) 15. , IMechE, Jan. (1976) 16. T. and Prof. , Cambridge University 17. J. , AFS Transactions 18. , Takemura, K. , INPEC, Bombay (1984) 19. E. , NACE (1983) 20. E. , NACE (1985) 21. 3. R. Keown Metallurgical Consultant Sheffield, England 1.

Ethylene. methanol etc. However. the cast alloys primarily developed for these processes find many other applications throughout industry. Some interesting current developments and future needs particularly in modification are also discussed. 2. PETROCHEMICAL PROCESSES Petrochemical "cracking" processes are carried out in large furnaces where pressurised mixtures of hydrocarbon feedstock. steam and air are passed through long reaction tubes or coils. Since the desired reactions are endothermic (absorbing heat).

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Agroforestry : overview by Alice E Beetz; Appropriate Technology Transfer for Rural Areas (Organization)

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