Oil sampling process before and after filtering by oil purifier
We usually use oil purifier to check oil samples before and after filtering oil. The most important work before the oil is tested when the oil is sampled. If the sampling is not done in accordance with the regular process, the detection indicators will be inaccurate and will not give the correct oil quality results:
1. The sample used for the test must be representative of the oil sampled. To ensure this, there are many considerations. They depend on the characteristics of petroleum and petroleum liquid products, the tanks and pipelines being sampled, and the nature of the test specimens.
2. Sampling can only be performed when the sample in the oil tank is stationary. In order to take a representative sample from a stationary oil tank, upper, middle and lower samples are usually taken and mixed according to regulations.
Second, according to standards
Oil sampling is divided into manual sampling and automatic sampling
The operation of manual sampling shall be carried out in accordance with the relevant provisions in the standard of GB / T4756-1998 "Manual sampling method for petroleum liquids". This standard is mainly used for various types of containers (such as oil tanks, tank trucks, cruise ships, etc.) and pipeline oil product sampling. When sampling from an oil tank, the pressure inside the tank should be normal pressure, and the temperature of the oil should not be too high, and it should be liquid.
The automatic sampling method should comply with the relevant provisions of SY / T5317-2006 "Petroleum Liquid Pipeline Automatic Sampling Method". This standard is applicable to the continuous automatic sampling of oil pipeline products.
Preparation and requirements for sampling
1. Sampling conditions
Samplers, sampling equipment and sample containers that are clean, dry, leak-proof, and of sufficient strength and capacity should be selected.
The sample container is a receptacle for storing and transporting samples, with a volume of 0.25-5L. It can be glass bottles, plastic bottles (not for oil storage), bottles with metal caps, and should have appropriate stoppers. , Cap or valve seal specimen.
1. Samples obtained from the oil tank supplied by the gas station, or in the gas pipeline at any time during the fueling process. (Gas station sampling)
2. The samples obtained in the fuel tank should be sampled at 1/2 below the liquid level of the large oil tank. It is not possible to take samples from the residual tank of the daily oil tank, which does not meet the sampling requirements, and also causes the oil product to fail the test because the residual tank drains the condensed water and residues inside the tank. (External inspection)
3. Sampling method and operation precautions
(1) When sampling, first rinse the sampler once with the oil to be sampled. At the location specified in the sampling, lower the sampler until the mouth reaches the required depth, and open the plug with a suitable method. Keep the sampler at the liquid level until it is full.
(2) The gas station samples were taken in duplicate, and one copy was left for each party receiving the oil; the external inspection was made in triplicate, one copy was left by each party, and one was sent to a nationally recognized authority for testing.
(3) The oil product testing is divided into on-site testing and authoritative agency submission. There is a certain positive and negative error value in the on-site rapid sulfur measurement instrument. Therefore, it is recommended to submit the stamped inspection report to the authoritative agency.
(4) After the sample is taken, it should be sealed in a dry and clean bottle for sample analysis and arbitration. Put a label, indicate the sampling location, container (tank) number, date, oil product name, brand name and sample type, etc., seal the visa on both sides, and keep in a cool and dark place.