ASTM D [ Withdrawn ]. Standard Practice for Sampling Insulating Liquids for Gas Analysis and Determination of Water Content. For complete instructions on sampling electrical insulating fluids for GAS ANALYSIS and determination of water content refer to ASTM D Adjust flow. electric equipment, are detailed in the Doble Reference Book on Insulating Liquids and Gases , ASTM Practices. D  and D . GOOD SAMPLE.
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A number in parentheses indicates the year of last reapproval.
Dpdf – Documents
Asuperscript epsilon e indicates an editorial change since the last revision or reapproval. Care must be taken in drawing samples to preventcontamination and to ensure a truly representative sample. Syringes having precision ground barrels andpistons are preferred. These cylindershave the disadvantage of not allowing visual inspection of theinterior of the cylinder.
To minimizewaste and potential spills a length of 60 cm 24 in.
ASTM D for Sampling Insulating Liquids for Gas Analysis and Water Analysis – YONGRUN
Cleaning of Apparatus 5. See Test Methods D for further details about generalcleaning requirements. When thedrying period has expired, syringe pistons shall be placed intheir barrels, valves closed; stainless steel cylinder valvesshould be closed; or cans sealed with their screw cap.
It isdesirable that stainless steel cylinders be evacuated and sealedafter cleaning. Cleaning thetubing should be considered impractical. Current edition approved April 10, Originallypublished as D — astn Last previous edition D — This should involve a volumeof air equivalent to at least 55 changes of the cylinder volumeduring the 15 min period of drying.
The air may be dried bypassing the air through two drying towers in series, each toweris at least 9 cm diameter and 28 cm in height. Preparation for Sampling 6. If the slug moves towardsthe electrical apparatus, a negative pressure exists. If the slug moves away from theelectrical apparatus, a positive pressure exists.
Samples can beobtained safely. Extreme care should be used in performingthis procedure. Wipethe inside of the valve and threads with a clean lint-free cloth. Drain at least 1. One of twoprocedures may then be used to prepare the sample outlet. Remove the security pipe plug fromthe drain valve. Wipe the inside of the valve and threads witha clean lint free cloth. Install the drain valve security plug. Test Method DTable 1,provides coefficients of d361 for different gas-in-oil analy-sis from samples collected in the three containers recom-mended in this practice.
However, gas-saturated samples will begin to release gases bubbles soon after sampling. Do not release any evolvedgases bubbles since these gases must be included in thedissolved gas analysis.
Astmm Samples Using Syringe 8. Attach the plastic tube tothe syringe as shown in Fig. Position the handle toward the syringe. Immediately close the port into the syringe Fig. Slowly depress the syringepiston until all the oil is evacuated from the syringe completing FIG.
Perform this condition procedure onemore time. A large variancefrom normal should be considered when evaluating the testresults obtained when the syringe conditioning was not used. Care shall be taken not tocontaminate the syringe inlet port. Immediately close the port to thesyringe Fig. Close thestopcock, with the handle toward the syringe. Do not pull thepiston manually since this can result in bubble formation.
Separate the syringe from the tubing and inspect forair bubbles.
Transformer Oil Gas Analyser (TOGA)
If air is present, discharge oil with the syringevertical stopcock up and obtain another sample. Connectthe oil-resistant tubing to the lower valve port on the steelcylinder and connect a short piece approximately 60 cm 24in. Open the lower valve on the steel cylinder. With all three valves openand the cylinder held in a vertical position see Fig. Remove the sample adapter if used, andreinstall the security plug with a non-hardening thread sealant. If any sound is heard,the cylinder should be drained and the sampling repeated.
Once the container is full, install thecap immediately. The tubing should not be reused. Packaging and Shipping Do not allow the oil to be exposed tosunlight. Convenient cardboard cartons for storing and trans-porting syringes can be obtained.
Samples should be forwardedto the laboratory as quickly as possible.
The samples should notbe stored. Epidemiology, pathogenesis, and clinical manifestations of Ebola and Marburg virus disease. Chalmers The Components v3613 Content. Ethics for managements consultans.
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