Cochin laboratory

ELECTRICAL CONDUCTIVITY (D 2624, IP 274, ISO 6297)

The ability of a fuel to dissipate charge that has been generated during pumping and filtering operations is controlled by its electrical conductivity, which depends upon its ionic species content. If the conductivity is high enough, charges dissipate fast to prevent their accumulation and avoid dangerously high potentials in a receiving tank. These test methods cover the determination of the electrical conductivity of aviation and distillate fuels with and without a static dissipator additive.

FLASH POINT

Flash point measures the tendency of a sample to form a flammable mixture with air under controlled laboratory conditions. Flash point data are used in shipping and safety regulations to define “flammable” and “combustible” materials. Flash point data can also indicate the possible presence of highly volatile and flammable material in a relatively nonvolatile or nonflammable material. Erroneously high flash points can be obtained when precautions are not taken to avoid the loss of volatile material. Samples should not be stored in plastic bottles, since the volatile material may diffuse through the walls of the container. The containers should not be opened unnecessarily. The samples should not be transferred between containers unless the sample temperature is at least 20°F (11°C) below the expected flash point. Below mentioned are some of the methods for determining the flash point of petroleum products

Cleveland Open Cup (P 69, D 92, IP 36, ISO 2592)

Pensky Martens Closed Cup Tester (P 21, D 93, IP 34, ISO 2719)

Tag Closed Tester (P 20, D 56, IP 170, ISO 13736)

Small Scale Closed Tester (D 3828, IP 303, ISO 3679)

Continuously Closed Cup Flash Point (D 6450)
GUM CONTENT

Oxygen-containing impurities in the form of gum are limited by the existent gum method and potential gum method