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Safety trap for vacuum line
VACUUM
Classified Abstracta
Vacuum Apparatus and Auxiliaries -
II -
II
Abstract No. and Befemnces
Contd.
Apparatus for Supplying Charge Material to Mass Spectrometers See Abstract
No.
79/u
: 60/U 80/1x
Safety Trap for Vacuum Line South Africa. Where vacuum is used to transfer liquids from one storage vessel to another a safety trap should be provided to prevent the liquid from being drawn into the vacuum system. The design of a trap is described and shown in an illustration which is employed in a system transferring distilled water from the still to an overhead distribution tank. In operation, any liquid overflow must pass into the trap before it reaches the vacuum system. The liquid collecting in the trap causes a float to rise, which operates a valve closing the connection to the vacuum system. Simultaneously a needle valve opens and admits air to the trap. Now, the The trap is reset for normal operation by depressing the needle valve. trap can be drained by a stopcock. Somnzairc sous vide.
: La construction
d’un piege est decrit, lequel empeche un liquide de penetrer dans un systeme 11 est utilis6, dans un systeme transferrant de I’eau distillee d’un distillateur a un reservoir.
0
29 -
MISCELLANEOUS
Bursting Disc Assembly for Alternating See Abstract No.
APPARATUS
-
29
Pressure and Vacuum at Elevated Temperatures
Environmental
No.
81/H
: 96/I
sap
A Recording Mercurial Manometer for the Pressure Range 0-760 mm. of Mercury See Abstract
Article by R. S. Young & R. Snaddon Lab. Pradica a, Jan. 1958 37
: 47/U 83/11
Test Chamber
U&ed States. This is a testing of sub-assemblies temperatures, humidity In addition, the chamber conditions if desired.
short note describing a recently installed 440 ft.* environmental test chamber for the and materials required in high-flying aircraft. The chamber can produce variable and altitude conditions, all of which may be changed independently of each other. is equipped with a 3,000 r.p.m. drive and other auxiliaries to simulate actual operating
Sommaire : Breve note sur une chambre a atmosphere etc., pour avions.
variable pour l’dtude de produits finis, pieces detachees
Metal Ebulliometers for Vapour Pressure Measurement United States. There are many variations of the ebulliometric method of measuring vapour pressure but only a few are available for use with corrosive materials. The equipment described here has been developed for corrosive materials and can be used for the entire liquid range. Two apparatus are mentioned, the first, for the determination of vapour pressures up to two atmospheres and the second for the determination of vapour pressures as high as 3,000 psia. The first consists of a single boiling point tube where the sample is heated electrically to its boiling point at selected pressures. A platinum resistance thermometer was used for the measurement of the dew point temperatures of the vapour. Coiled copper tubing through which a stream of air could be passed is suspended in a vacuum jacket surrounding the boiling point tube as an additional means A condenser filled with ice water revented the sample from of controlling the temperature in the column. entering the manometer system. This latter consisted of two small liquid nitrogen % aps, a surge tank, a sodalime trap, the controls and a mercury column manometer with a three-metre long reference limb made from 50 mm. precision bore tubing. The reference limb was precisely regulated by continuously bleeding helium to the vacuum pump. Through a different valve high pressure helium was admitted intermittently into the system to act as a buffer between the boiling point tube and the manometer. Details are given of the manustat arrangement incorporated in the system. Initial experiments with benzene yielded data deviating no more than 0.04” from those published by the National Bureau of Standards. The second apparatus consisted of two identical boiling-point tubes connected to a common pressure system. One boiling-point tube was filled with water and constituted a reference system. The vapour pressures of water are accurately known. Thus measuring the boiling temperature of each at the same pressure facilitated the determination of the pressure of the test sample. The temperatures were again measured with a platinum resistance thermometer. Both boiling-point tubes were connected to a common helium supply, surge tank and pressure gauge and a small valve used for evacuating the system releasing excess pressure, etc. The apparatus was used to determine the vapour pressure of n-hexade-cafluoroheptane in the range of 90-195°C. The values obtained by the two methods did not differ by more than 0.05% of the pressure. Sommaire : Details sur un dispositif de mesure de pression de vapeur fonctionnant ebulliometrique convenant a l’emploi de material corrosif.
April,
1953
Vacuum Vol. III No. 2
en rapport avec la m&Rode
Article by G. D. Oliver 8; J. W. Grisard Rev. hi. Instrum. *4a ikzhdg53
201
Classified Abstracta
Vacuum Apparatus and Auxiliaries -
II -
II
Abstract No. and Befemnces
Contd.
Apparatus for Supplying Charge Material to Mass Spectrometers See Abstract
No.
79/u
: 60/U 80/1x
Safety Trap for Vacuum Line South Africa. Where vacuum is used to transfer liquids from one storage vessel to another a safety trap should be provided to prevent the liquid from being drawn into the vacuum system. The design of a trap is described and shown in an illustration which is employed in a system transferring distilled water from the still to an overhead distribution tank. In operation, any liquid overflow must pass into the trap before it reaches the vacuum system. The liquid collecting in the trap causes a float to rise, which operates a valve closing the connection to the vacuum system. Simultaneously a needle valve opens and admits air to the trap. Now, the The trap is reset for normal operation by depressing the needle valve. trap can be drained by a stopcock. Somnzairc sous vide.
: La construction
d’un piege est decrit, lequel empeche un liquide de penetrer dans un systeme 11 est utilis6, dans un systeme transferrant de I’eau distillee d’un distillateur a un reservoir.
0
29 -
MISCELLANEOUS
Bursting Disc Assembly for Alternating See Abstract No.
APPARATUS
-
29
Pressure and Vacuum at Elevated Temperatures
Environmental
No.
81/H
: 96/I
sap
A Recording Mercurial Manometer for the Pressure Range 0-760 mm. of Mercury See Abstract
Article by R. S. Young & R. Snaddon Lab. Pradica a, Jan. 1958 37
: 47/U 83/11
Test Chamber
U&ed States. This is a testing of sub-assemblies temperatures, humidity In addition, the chamber conditions if desired.
short note describing a recently installed 440 ft.* environmental test chamber for the and materials required in high-flying aircraft. The chamber can produce variable and altitude conditions, all of which may be changed independently of each other. is equipped with a 3,000 r.p.m. drive and other auxiliaries to simulate actual operating
Sommaire : Breve note sur une chambre a atmosphere etc., pour avions.
variable pour l’dtude de produits finis, pieces detachees
Metal Ebulliometers for Vapour Pressure Measurement United States. There are many variations of the ebulliometric method of measuring vapour pressure but only a few are available for use with corrosive materials. The equipment described here has been developed for corrosive materials and can be used for the entire liquid range. Two apparatus are mentioned, the first, for the determination of vapour pressures up to two atmospheres and the second for the determination of vapour pressures as high as 3,000 psia. The first consists of a single boiling point tube where the sample is heated electrically to its boiling point at selected pressures. A platinum resistance thermometer was used for the measurement of the dew point temperatures of the vapour. Coiled copper tubing through which a stream of air could be passed is suspended in a vacuum jacket surrounding the boiling point tube as an additional means A condenser filled with ice water revented the sample from of controlling the temperature in the column. entering the manometer system. This latter consisted of two small liquid nitrogen % aps, a surge tank, a sodalime trap, the controls and a mercury column manometer with a three-metre long reference limb made from 50 mm. precision bore tubing. The reference limb was precisely regulated by continuously bleeding helium to the vacuum pump. Through a different valve high pressure helium was admitted intermittently into the system to act as a buffer between the boiling point tube and the manometer. Details are given of the manustat arrangement incorporated in the system. Initial experiments with benzene yielded data deviating no more than 0.04” from those published by the National Bureau of Standards. The second apparatus consisted of two identical boiling-point tubes connected to a common pressure system. One boiling-point tube was filled with water and constituted a reference system. The vapour pressures of water are accurately known. Thus measuring the boiling temperature of each at the same pressure facilitated the determination of the pressure of the test sample. The temperatures were again measured with a platinum resistance thermometer. Both boiling-point tubes were connected to a common helium supply, surge tank and pressure gauge and a small valve used for evacuating the system releasing excess pressure, etc. The apparatus was used to determine the vapour pressure of n-hexade-cafluoroheptane in the range of 90-195°C. The values obtained by the two methods did not differ by more than 0.05% of the pressure. Sommaire : Details sur un dispositif de mesure de pression de vapeur fonctionnant ebulliometrique convenant a l’emploi de material corrosif.
April,
1953
Vacuum Vol. III No. 2
en rapport avec la m&Rode
Article by G. D. Oliver 8; J. W. Grisard Rev. hi. Instrum. *4a ikzhdg53
201