Standard Test Method for Salts in Crude Oil (Electrometric Method).
This test method covers the determination of the approximate chloride (salts) concentration in crude oil. The range of concentration covered is 3.5 mg/kg to 500 mg/kg or 1.0 lb/1000 bbl to 150 lb/1000 bbl (PTB) as chloride concentration/volume of crude oil.
This test method measures conductivity in the crude oil due to the presence of common chlorides, such as sodium, calcium, and magnesium. Other conductive materials may also be present in the crude oil.
The mixing system is composed by a motorized syringe fed by 6 tanks that are connected to a motorized 7 ways valve.
The valve selects the tank from wich the solvent is pulled an has a position for pushing to the cell through a calibrated pipe that contains the fresh sampl of oil.
The result is written as a 4..20mA linearized to 0 to 20PTB on 2 analog outputs (the second analog output marked as “ANALOG RESULT BACKUP” in electrical drawing is a duplicate of the first one has been foressen in case of fault of the first channel).
The result is also written in register 40001 of modbus as a fixed point value.
From modbus it is possible to access also the last 100 analysis of the instrument.
Instrument is equipped with reundant Modbus RTU interface.
If the result is grater than 10PTB (Pounds per Thousands of Barrels).
The alarm trigger can be configured via HMI on analysis options page.
An internal fast loop provided with adequate pressure reducer and mutex filter to feed the analyzer.
A slow loop after the fast loop outlet provides the right quantity of sample needed by the system.
Tubing 6 × 4 mm
Measuring principle: Electrometric
Detector: Conductivity cell
Solvent Mixture: absolute Methanol/Butanol
Cleaning Solution: Naphta
3 × 12 litre for Methanol/Butanol, CRM and Blank
2 × 19 litre for rinse solution and Xylene carrier