Closure to “Discussions of ‘A Pilot-Plant Investigation of Factors Affecting Low-Temperature Corrosion in Oil-Fired Boilers’” (1965, ASME J. Eng. Power, 87, pp. 202–203)

1965 ◽  
Vol 87 (2) ◽  
pp. 203-204
Author(s):  
R. C. Attig ◽  
P. Sedor
Keyword(s):  
Low Temperature ◽  
Pilot Plant ◽  
Factors Affecting

A Pilot-Plant Investigation of Factors Affecting Low-Temperature Corrosion in Oil-Fired Boilers

1965 ◽  
Vol 87 (2) ◽  
pp. 197-202
Author(s):  
R. C. Attig ◽  
P. Sedor
Keyword(s):  
High Temperature ◽  
Carbon Steel ◽  
Low Temperature ◽  
Corrosion Rate ◽  
Pilot Plant ◽  
Metal Temperature ◽  
Flue Gases ◽  
Factors Affecting ◽  
Excess Air ◽  
Future Work

Methods for controlling or eliminating low-temperature corrosion are continually being sought to improve boiler availability and thermal efficiency. A small pilot plant was constructed at the authors’ company in which factors that affect low-temperature corrosion could be studied under closely controlled conditions. Results of tests on this unit show that: (a) The corrosion rate on carbon steel increases gradually as metal temperature falls below the acid dewpoint, passing through a peak at a metal temperature about 200 F. The corrosion rate then decreases as metal temperature continues to fall but begins to rise rapidly to extremely high values at temperatures just above the water dewpoint (⋍ 120 F). (b) Low-temperature corrosion of carbon steel can be practically eliminated if a method can be found for reducing the sulfur content of oil to about 0.5 percent. (c) The application of low-excess-air operation has the potential of eliminating low-temperature corrosion in boiler plants firing high-sulfur residual oils. (d) Corrosion of carbon steel above approximately 170 F can be reduced 30 percent or more by recirculating 25 percent of the flue gases to the burner. Future work will include a study of the effect of low-excess-air operation on high-temperature oil-ash corrosion and deposition and on the effect of oil ash on low-temperature corrosion.

Flower initiation in pasture legumes. I. Factors affecting flower initiation in Trifolium subterraneum L.

1955 ◽  
Vol 6 (2) ◽  
pp. 211 ◽  
Author(s):  
Y Aitken
Keyword(s):  
Low Temperature ◽  
Subterranean Clover ◽  
Trifolium Subterraneum ◽  
Cold Period ◽  
Effect Of Temperature ◽  
Flower Initiation ◽  
Temperature Level ◽  
Factors Affecting ◽  
Pasture Legumes ◽  
Precise Knowledge

The value of the annual legume Trifolium subterraneum L. (subterranean clover) in Australian agriculture warrants more precise knowledge of factors affecting flowering and prolific seeding. The effect of temperature and photoperiod on flower initiation in early and later flowering varieties has been investigated in an effort to determine the geographical limits of the use of subterranean clover in Australia. At any time of sowing, the length of the growing season of a variety depends greatly on the variety's response to the temperature level and to the photoperiod of the first few weeks after germination. In all varieties of subterranean clover so far examined flower initiation is accelerated by a period of low temperature. In the later varieties, flower initiation is prevented by an insufficient period of low temperature. The length of the necessary cold period is shortened under longer photoperiod. Early varieties are early flowering because they do not require so long a cold period or so low a temperature as late varieties.

Synchroshear Versus Conventional Shear Mechanisms in Transitionmetal Disilicides with the C40 Structure

1999 ◽  
Vol 578 ◽  
Author(s):  
H. Inui ◽  
M. Yamaguchi
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Plastic Flow ◽  
Deformation Mechanism ◽  
Deformation Behavior ◽  
Basal Slip ◽  
Room Temperature ◽  
Onset Temperature ◽  
Factors Affecting ◽  
Temperature Group

AbstractThe deformation behavior of (0001) <1210> basal slip in single crystals of five different transitionmetal disilicides with the C40 structure has been investigated in the temperature range from room temperature to 1500°C in compression. These disilicides are found to be classified into two groups depending on the onset temperature for plastic flow. The low-temperature group, which consists of VSi2, NbSi2 and TaSi2, exhibits the onset temperature for plastic flow around 0.3 T/Tm (melting temperature) and deforms by a conventional shear mechanism. In contrast, the high temperature group, which consists of CrSi2 and Mo(Si,Al)2, exhibits the onset temperature around 0.6T/Tm and deforms by a synchroshear mechanism. Factors affecting the deformation mechanism in these C40 disilicides are discussed in terms of directionality of atomic bonding and the relative stability of the C40 phase with respect to the C11b phase.

Environmental factors affecting the low temperature isomerization of homohopanes in acidic peat deposits, central China

2015 ◽  
Vol 154 ◽  
pp. 212-228 ◽  
Author(s):  
Xianyu Huang ◽  
Philip A. Meyers ◽  
Jiantao Xue ◽  
Linfeng Gong ◽  
Xinxin Wang ◽  
...  
Keyword(s):  
Low Temperature ◽  
Environmental Factors ◽  
Central China ◽  
Factors Affecting ◽  
Peat Deposits
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