- Email: [email protected]
Fuel tablet
I54
CURRENT
TOPICS.
[J. r;. I.
After making a study of the various fuel gases that could be used in metal spraying of zinc and copper it was decided to install a booster pump in the plant’s natural gas line and pipe the gas to the metal spray booths. The booster pump is capable of supplying the spray guns with pressure up to 150 lb. It has been found, however, that a 50 lb. pressure apparently is the most efficient and economical to use. Gas pressures higher than that do not increase the number of pounds of metal sprayed per hour in proportion to the amount of gas and oxygen consumed. A further advantage was obtained by installing an oxygen manifold and piping the oxygen to the metal spray booths, thereby eliminating any cylinder handling by the operators. Lower fuel costs can be achieved, although a natural gas and oxygen flame does not have as high a flame temperature as oxy-acetylene, because a higher pressure can be used to offset this B.t.u. loss. Using high pressure natural gas also provides a wide range of spraying speeds and makes possible a 15 per cent. saving in operating time. The number of square feet of metal that can be sprayed per hour is governed b! how many pounds of wire can be melted at the gun. R. H. 0. Fuel Tablet.-( Chemical and Metallurgical Engineering, Vol. 51, No. 6.) A new type of fuel tablet for heating the meat component of combat rations or heating water in a canteen cup in the field for coffee or cocoa has been developed by the Quartermaster Corps in collaboration with the Office of Scientific Research and Development, the War Department has announced. The tablet is a synthetic compound, known as trioxane, with a binder to hold it in solid form when burning, and coloring matter to distinguish it as nonedible. It has several advantages over the previously developed square candle, made principally of paraffin, such as a fast rate of heating, light weight, compactness and a blue flame of low luminosity. The tablets are flat, weigh slightly more than one ounce, and each will heat an individual meal from the “C” or “K” combat rations in 6 or 7 minutes. The new fuel is substantially free from smoke-producing ingredients and will not smudge the bottom of the It is packed in a moisture-proof foil envelope and may vessel being heated. be burned in a small trench or behind a small shield to protect the flame from wind. R. H. 0. Condition Aircraft Plant By Centrifugal Machines.-(Refrigerating Engineering, Vol. 47, No. 6.) The construction of giant aircraft plants in wartime America has set no more significant pattern for future industry than the increasing use of complete, year-round air conditioning as a major production tool. Typical of the trend is the new windowless, II-acre plant of. Jacobs Aircraft Engine Company, at Pottstown, Pa. Its air conditioning boosts production by eliminating time and material losses due to dust and variations in the temperature and humidity of the air. Indicative of the size of the system and the job it does, is the fact that it requires five Carrier centrifugal refrigerating machines, supplying a cooling
CURRENT
TOPICS.
[J. r;. I.
After making a study of the various fuel gases that could be used in metal spraying of zinc and copper it was decided to install a booster pump in the plant’s natural gas line and pipe the gas to the metal spray booths. The booster pump is capable of supplying the spray guns with pressure up to 150 lb. It has been found, however, that a 50 lb. pressure apparently is the most efficient and economical to use. Gas pressures higher than that do not increase the number of pounds of metal sprayed per hour in proportion to the amount of gas and oxygen consumed. A further advantage was obtained by installing an oxygen manifold and piping the oxygen to the metal spray booths, thereby eliminating any cylinder handling by the operators. Lower fuel costs can be achieved, although a natural gas and oxygen flame does not have as high a flame temperature as oxy-acetylene, because a higher pressure can be used to offset this B.t.u. loss. Using high pressure natural gas also provides a wide range of spraying speeds and makes possible a 15 per cent. saving in operating time. The number of square feet of metal that can be sprayed per hour is governed b! how many pounds of wire can be melted at the gun. R. H. 0. Fuel Tablet.-( Chemical and Metallurgical Engineering, Vol. 51, No. 6.) A new type of fuel tablet for heating the meat component of combat rations or heating water in a canteen cup in the field for coffee or cocoa has been developed by the Quartermaster Corps in collaboration with the Office of Scientific Research and Development, the War Department has announced. The tablet is a synthetic compound, known as trioxane, with a binder to hold it in solid form when burning, and coloring matter to distinguish it as nonedible. It has several advantages over the previously developed square candle, made principally of paraffin, such as a fast rate of heating, light weight, compactness and a blue flame of low luminosity. The tablets are flat, weigh slightly more than one ounce, and each will heat an individual meal from the “C” or “K” combat rations in 6 or 7 minutes. The new fuel is substantially free from smoke-producing ingredients and will not smudge the bottom of the It is packed in a moisture-proof foil envelope and may vessel being heated. be burned in a small trench or behind a small shield to protect the flame from wind. R. H. 0. Condition Aircraft Plant By Centrifugal Machines.-(Refrigerating Engineering, Vol. 47, No. 6.) The construction of giant aircraft plants in wartime America has set no more significant pattern for future industry than the increasing use of complete, year-round air conditioning as a major production tool. Typical of the trend is the new windowless, II-acre plant of. Jacobs Aircraft Engine Company, at Pottstown, Pa. Its air conditioning boosts production by eliminating time and material losses due to dust and variations in the temperature and humidity of the air. Indicative of the size of the system and the job it does, is the fact that it requires five Carrier centrifugal refrigerating machines, supplying a cooling