A cast-nylon insulating flange for use on marine docks and terminals that provides greater electrical resistance than regular insulating gasket kits. It prevents any possibility of an electric arc upon disconnection of the hose and eliminates the need for a separate bonding wire.
Insul-Flange retains the properties of insulating flange gasket kits, but is much easier to install and inspect for the properties of non-conductivity.
Features
- Construction: Cast Nylon
- Resistant to most common solvents, lubricants, hydrocarbons, esters, key tone, and aqueous solutions of acids and alkalies at PH5 to Ph 11
- For more sever chemical service, PTFE lining is an option
- Melting Point: 428ºF/220ºC
- Electrical Resistivity: 1012 ohm/cm
- Compliances: California State Lands Commission, M.F.D. 2380; U.S.C.G. 154.810 Vapor Line Connections, Section G - Facility Vapor Connections; ISGOtt Chapter 6 - Electrical Insulation
Specifications
More Info
Electrical Properties of Marine Dock Hose Assemblies
Low conductivity petroleum products and solvents such as gasoline and toluene, become electrostatically charged when flowing through a pipeline, and the pipeline itself, acquires a charge of opposite polarity
If the pipeline is earthed, the accumulated charge flows safely to the ground.
If the pipeline is not earthed, a charge could accumulate, and possibly discharge instantaneously, by an incendive spark to a nearby earthed conductor. If the spark has sufficient energy and an inflammable air/product mixture is present, an explosion will result.
Hoses should specify if they are electrically conductive with a maximum resistance of 10 ohms, which will continuously drain away the electrostatic charge. A maximum flow velocity of 7m/sec when pumping low conductivity products should also be specified to ensure that a charge is not generated more quickly than can be dissipated through normal arrangements.
Charges generated can be of many thousands of volts, but currents are of the order of a few micro amps.
If the piping system of a marine terminal is electrically conductive, an electrical charge flows along the piping because of dock/pier-side cathodic protection systems.
With the potential inductive effect of the piping system, a spark could occur the moment a hose is disconnected.
Insul-Flange controls undesirable electrical currents by preventing the heavy electrical flow in the piping system and eliminating the risk of an electrical arc when the hose is disconnected.
