Rechercher

Fixes the equivalence of the principal terms used in the field of reliability of structures, in different languages (English, French, Russian and German). An annex contains approximate but simple definitions of, and commentary on, the terms listed, gives indications about their use and quotes the corresponding symbols and subscripts.

Specifies an enzymic method, which is not applicable to fats and oils containing polyunsaturated fatty acids of the omega-8 and omega-9 series or containing branched chain fatty acids. The method consists in saponifying of a test portion at ambient temperature followed by liberation of the fatty acids; enzymic oxidation of the fatty acids; measurement, at the wavelength of maximum absorbance (…

Describes three patterns using round (circular) and square perforations. The sizes of holes range down to 2 mm for square holes and to 0.5 mm for round holes. Five ratios of pitch to hole are specified which result in nominal open areas ranging from about 60 % to 23 %.

Describes two test methods, A and B, for assessing the electric strength of insulating liquids in a divergent field when subjected to standard lightning impulses. Method A is based on a step procedure intended to provide an estimate of impulse breakdown voltage under specific conditions. Method B is a statistical test designed to check a hypothesis about the impulse breakdown probability of an…

Is primarily intended for high purity papers such as are used for insulation in electrical equipment, and does not contain any statement about the tests to be made on the paper. It is left to the parties concerned to determine which tests are appropriate for the type of paper being evaluted.

Describes the preparation of mixtures by continuos mixing of volume flows, whereby the precision of the concentration of each constituent in the range from 10 000 to 10 ppm (V/V) amounts to about 5%. Includes a practical example with figure.

1. Scope 1.1 This Standard applies to the measurement of vinyl chloride in air, using grab samples or integrated samples, usually collected by continuous adsorption in a sorbent tube over a period of time. 1.2 This Standard employs gas chromatography for the measurement of concentrations of vinyl chloride in air between 0.01 mg·m-3 and 2600 mg·m-3 at 25°C and 101.3 kPa. 1.3 Grab…

Contains general data for selection and erection of switchgear and controlgear. It covers devices for protection against indirect contact by automatic disconnection of supply, devices for protection against overcurrent and information about coordination of various protective devices. This second edition is renumbered to fall in line with Part 4 of IEC 364.

A small quantity of the oils is analyzed by gas chromatography under specified conditions on a packed column. The safrole and cis- and trans-isosafrole contents are determined by using the internal standard method. As stationary phase are used polydimethylsiloxane, or polyethylene glycol 20000. Operating temperatures: Oven: isotherm about 100 °C when using polydimethylsiloxane; isotherm about 125…

A small quantity of the oils is analyzed under specified conditions. The alpha- and beta-thujone contents are determined by using the internal standard or addition method. As stationary phase are used cyanopropyl methylphenyl methyl silicone, or trifluoropropylmethyl silicone, or polyethylene glycol 1500. Operating temperatures: Oven: isotherm about 100 °C when using cyanopropyl methylphenyl…