Why do our Customers want to measure conductivity?
ASTM D4865-98 states, "Every year a number of fires and explosions in petroleum product systems are attributed to spark ignition from accumulated static electricity... A subtle and often misunderstood feature of these incidents is the possible accumulation of hazardous electrostatic charges in systems which are properly bonded and grounded. This can occur because refined hydrocarbon fuels have low electrical conductivities and electrostatic charges may be retained within the fuel and on it's surfaces." ASTM 4865-98 Standard Guide for Generation and Dissipation of Static Electricity in Petroleum Fuel Systems.
Please click on the application notes below for more information.
Application Note 07-005 - Personal and Process Safety
Application Note 07-004 - Safe Truck Loading
Application Note 06-003 - Stability
What happens if you do not control and measure conductivity?
High Flow Insertion Depth
In several instances customers have reported erratic readings when installed in “high” flow rate lines. Typically this is due to vortex air pocket shedding from structures up stream of the JF-1 sensor; however, it may have also been the result of flow separation inside the JF-1 sensor assembly. D-2 defines high flow product lines as lines in which the velocity of product exceeds 1.5M/sec (5 ft/sec). Velocity can be determine by dividing the cross sectional area of your pipe ((I.D./2)^2* 3.14 dived into your product flow rate (in equivalent units of measure). For locations meeting the qualifications for high flow rates a slightly different installation location is recommended. Click on the above manuals link to find more details.
JF -1A Sensor Mounting Adaptors
The JF-1 sensor has a 0.910” maximum diameter. The D-2 supplied sensor mount has a 1” NPT fitting, couple with a 0.980” bore hole. This allows the sensor to clear through a “full port” 1” ball valve.
Note, that the supplied JF-1A Sensor mount with 1” NPT fitting with a 0.980” through hole has a 0.1” wall thickness at the minor diameter of the NPT thread. The user must check local piping requirements to see if minimum wall thickness has been maintained when using this mount.
D-2 also offers optional mounts with larger NPT threads and Standard ANSI 150 flange mounts as options to its standard mount if your specific site requirements need a different adaptor. Please consult the factory prior to order.
Attached is our standard 1” NPT mount drawing (B440-027REV1), and an optional 2"ANSI 150 flange mount drawing (C441-084R1).
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