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Sampling Procedure for Liquid Raw Materials
What is the proper sampling method for liquid materials such as molasses and oils?
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6 Replies
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Informative
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Is it feed content?
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The proper sampling method for viscous liquid materials like molasses and oils focuses on ensuring the collected sample is truly representative of the bulk material, which can be challenging due to their high viscosity and the potential for stratification (layering) or settling of contaminants.
The method depends heavily on the container type (drums, tanks, circulating systems).
Key Principles for Sampling Viscous Liquids
* Ensure Homogeneity (Mixing):
* Before sampling, the liquid must be thoroughly mixed to ensure any settled solids or stratified layers are uniformly distributed. This is critical for viscous liquids like molasses or used oils.
* Molasses/Bulk Tanks: Use mechanical stirring or circulation through pumps.
* Oil Drums/Barrels: Use a drum mixer or roll the container vigorously.
* Use the Correct Sampler: Specialized tools are required to handle the viscosity and reach different depths.
* Thief or Tri-layer Sampler (for tanks/drums): A weighted device that is lowered to a specific depth, where a valve is opened to collect the sample. This is used to take samples from the top, middle, and bottom of the liquid, which are then typically combined to form an aggregate sample.
* Viscous Sampler (Syringe-type): Works like a large syringe, where the handle is pulled up to draw the thick liquid into the sampler tube.
* Pump Sampler (for bulk/circulating systems): A sampling pump used with a rigid or flexible tube to extract the liquid.
* Choose the Optimal Sampling Point (For Systems/Equipment):
* For lubricating oils in machinery, the best location is from a dedicated sampling valve or port on the main circulating line, after the pump but before the filter or component being monitored. This ensures the sample is representative of the active system and contains contaminants/wear particles before they are filtered out.
* AVOID sampling from drain plugs or static sumps, as these areas accumulate sediment and will yield a non-representative sample.
General Procedure Guidelines
* Cleanliness: Always use pre-cleaned, certified sample bottles and fresh, clean sampling tubes/hoses to prevent cross-contamination.
* Flush the Line: When sampling from a valve or port, allow a sufficient volume of the liquid (the “dead volume”) to flush out before collecting the final sample. This clears any stagnant or contaminated fluid from the sampling point.
* Collection: Fill the sample container to about 2/3 to 3/4 full to leave space for expansion and mixing at the lab.
* Temperature (Oils): For used oils, collect the sample while the equipment is running at normal operating temperature to ensure the oil is circulating and well-mixed.
* Labeling: Immediately and correctly label the sample bottle with all necessary information: source, date, time, equipment/lot ID, and sampling location.The proper sampling method for viscous liquid materials like molasses and oils focuses on ensuring the collected sample is truly representative of the bulk material, which can be challenging due to their high viscosity and the potential for stratification (layering) or settling of contaminants.
The method depends heavily on the container type (drums, tanks, circulating systems).
Key Principles for Sampling Viscous Liquids
* Ensure Homogeneity (Mixing):
* Before sampling, the liquid must be thoroughly mixed to ensure any settled solids or stratified layers are uniformly distributed. This is critical for viscous liquids like molasses or used oils.
* Molasses/Bulk Tanks: Use mechanical stirring or circulation through pumps.
* Oil Drums/Barrels: Use a drum mixer or roll the container vigorously.
* Use the Correct Sampler: Specialized tools are required to handle the viscosity and reach different depths.
* Thief or Tri-layer Sampler (for tanks/drums): A weighted device that is lowered to a specific depth, where a valve is opened to collect the sample. This is used to take samples from the top, middle, and bottom of the liquid, which are then typically combined to form an aggregate sample.
* Viscous Sampler (Syringe-type): Works like a large syringe, where the handle is pulled up to draw the thick liquid into the sampler tube.
* Pump Sampler (for bulk/circulating systems): A sampling pump used with a rigid or flexible tube to extract the liquid.
* Choose the Optimal Sampling Point (For Systems/Equipment):
* For lubricating oils in machinery, the best location is from a dedicated sampling valve or port on the main circulating line, after the pump but before the filter or component being monitored. This ensures the sample is representative of the active system and contains contaminants/wear particles before they are filtered out.
* AVOID sampling from drain plugs or static sumps, as these areas accumulate sediment and will yield a non-representative sample.
General Procedure Guidelines
* Cleanliness: Always use pre-cleaned, certified sample bottles and fresh, clean sampling tubes/hoses to prevent cross-contamination.
* Flush the Line: When sampling from a valve or port, allow a sufficient volume of the liquid (the “dead volume”) to flush out before collecting the final sample. This clears any stagnant or contaminated fluid from the sampling point.
* Collection: Fill the sample container to about 2/3 to 3/4 full to leave space for expansion and mixing at the lab.
* Temperature (Oils): For used oils, collect the sample while the equipment is running at normal operating temperature to ensure the oil is circulating and well-mixed.
* Labeling: Immediately and correctly label the sample bottle with all necessary information: source, date, time, equipment/lot ID, and sampling location. -
Three sampling procedures commonly associated with engine oil sampling include: sampling a pressurized line before the system filter; using a drop tube in the dipstick tube; and procuring a sample midstream from a drain port while draining the engine.
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This post has nothing to do with feed manufacturing – please when you post something make sure your source is related to animal feed manufacturing and not just something you found on the internet.
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In what aspects?
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