Grounding/Bonding Program FISHER SCIENTIFIC Grounding/Bonding Program Program 200.13 2000 Park Lane Pittsburgh, Pennsylvania 15275 Phone 412.490.8300 • Fax 412.490.8930 R E G U L A T O R Y A F F A I R S G R O U N D I N G P R O G R A M M A N U A L S E R I E S 2 0 0 P R O G R A M 2 0 0 . 1 3 Table of Contents 1 2 Application General 2.1 Definitions 2.2 Product Transfer Procedures 2.2.1 Metal to Metal 2.2.2 Metal to Plastic 2.2.3 Metal to Glass 2.2.4 Plastic to Glass 2.2.5 Plastic to Plastic 2.2.6 Glass to Glass 2.3 Waste Transfer Procedures 2.3.1 Metal to Metal 2.3.2 Plastic to Metal 2.3.3 Glass to Metal 2.3.4 Metal to Plastic 2.3.5 Plastic to Plastic 2.3.6 Glass to Plastic 2.4 Training 4 4 4 6 6 7 9 10 11 12 13 13 14 14 15 16 16 17 Mandatory Effective Date: April 2003 Rev. # 1 X Discretionary Page 3 of 17 R E G U L A T O R Y A F F A I R S G R O U N D I N G P R O G R A M 1 M A N U A L S E R I E S 2 0 0 P R O G R A M 2 0 0 . 1 3 APPLICATION The Grounding/Bonding Program applies to any Fisher facility performing a flammable or combustible liquid transfer from one container to another container. 2 GENERAL Electrostatic discharges can be a serious ignition source in any industrial operation. discharges are created through the following sequences: Electrostatic charge generation Charge accumulation Electrostatic discharge These Electrostatic charges can be generated on a surface any time there is a relative motion between those two surfaces. If one surface prefers to accept electrons, it will retain electrons after the separation, becoming negatively charged. The other surface will donate electrons during contact, and be left deficient in electrons after separation. That surface will become positively charged. When an insulating liquid exits a nozzle, the separation between the liquid and nozzle results in a transfer of electrons between the liquid and the nozzle, generating a charge on the surface of the liquid and surface of the nozzle. Electrostatic charges become a hazard when they begin to accumulate on surfaces. A grounded, conducting surface will not accumulate electrostatic charges. Insulating materials, and conductors isolated from ground will accumulate charges, and the charge can reach the high potential necessary to generate an electrostatic discharge. Continuing with this example, if a conducting liquid flows through a properly grounded nozzle, the charge will dissipate from the nozzle as quickly as it is generated, but an insulated nozzle will accumulate the electrostatic charge on its surface. If the liquid is conducting and maintains a constant stream, and flows through a grounded nozzle, the liquid will be grounded. However, if there is a splashing, or the liquid forms a spray, then droplets will be isolated, and can accumulate charge. An insulating liquid will accumulate charge whether it forms, or stays a constant stream. 2.1 Definitions Bonding Bonding is the interconnecting of two objects by means of a clamp and bare wire. Its purpose is to equalize the electrical potential between the objects to prevent a static discharge when transferring a flammable or combustible liquid from one container to another. Clamps that make contact with the charged object provide the conductive path and a low resistance flexible cable allows the charge to equalize. Mandatory Effective Date: April 2003 Rev. # X Discretionary Page 4 of 17 R E G U L A T O R Y A F F A I R S G R O U N D I N G P R O G R A M M A N U A L S E R I E S 2 0 0 P R O G R A M 2 0 0 . 1 3 Brush Discharge A brush discharge is an electrostatic discharge from an insulating solid. Brush discharges can ignite a flammable vapor atmosphere. Field Induction Field induction is an event that can directly or indirectly generates a static charge. Whenever any object becomes electro statically charged, there is an electrostatic field associated with that charge. If a bonding wire is placed in that electrostatic field, a charge may be induced on the device. If the device is grounded while within the electrostatic field, a transfer of charge from the wire occurs. Under the right conditions, fabric can generate static electricity. This can occur when the fabric is brought into contact with other materials and then separated, or when the fabric is rubbed on other surfaces. Most synthetic fabrics (nylon, orlon, dacron and rayon) are more active generators of static electricity than natural fabrics. Rubber and leather-soled shoes can generate static when the wearer walks on dry carpeting or other non-conductive surfaces during periods of low humidity. The potential for a fabric to generate electricity should be considered, and appropriate steps taken to minimize the potential when developing the site specific grounding/bonding procedures. Grounding The procedure used to carry an electrical charge to ground through a conductive path. A typical ground may be connected directly to a conductive water pipe or to a grounding bus and ground rod. Isolated Conductors A conductive object has little resistance to the flow of electrostatic charge. If a conductive object is in contact with electrical ground, eliminating an electrical field from the object with electrical ground, it is grounded. This state allows any electrostatic charge on the object to easily flow to ground, eliminating an electrical field from the object. A conductor may be considered isolated and capable of accumulating a dangerous electrostatic charge if the resistance to ground is greater than 1 x 108 ohms. Isolated conductors can create an electrostatic discharge if they are brought close to any conductor, which is at a lower electrical potential. The electric field on the isolated conductor ionizes the air between it and the grounded conductor. This ionized channel allows the charge to flow off the isolated conductor to the grounded conductor. The ionized channel is visible as a flash of light, and is accompanied by an audible noise. A discharge between two conductors is classified as a spark discharge. Spark discharges are very energetic, and are capable of igniting flammable vapors and dust clouds. Insulating Isolated Conductors Mandatory Effective Date: April 2003 Rev. # X Discretionary Page 5 of 17 R E G U L A T O R Y A F F A I R S G R O U N D I N G P R O G R A M M A N U A L S E R I E S 2 0 0 P R O G R A M 2 0 0 . 1 3 Isolated conductors can become insulated conductors when an insulated barrier interrupts the grounding path. Some common examples of insulators causing conductors to become isolated from ground include: Metal table placed on a rubber mat or insulated floor Totes on rubber wheels Drums on pallets Metal step ladder with rubber feet Metal reinforcement on a plastic hose Container on a insulated conveyor line Insulating Solids A solid material is classified as insulating or conducting based on its volume and surface resistivity. Insulating materials cannot conduct electrical charge, so any static charges, which are generated on them, will accumulate on them. Most plastic and rubber materials used in a plant are generally electrically insulating. Propagating Brush Discharge A special situation arises when insulating layers are applied to grounded conductors. The energy available for an electrostatic discharge is limited by the amount of charge present on the surface. The charge density on a surface is limited by the breakdown potential of the breakdown medium. In most cases the breakdown medium is air. However, if a thin layer of insulating material is placed on top of a grounded conductor, the charge density on the surface of the insulator may reach a much higher value. The reason is that the electric field from the surface of the insulator is directed through the insulator, rather than the air. In this situation, the breakdown medium becomes the insulating layer, not the air. The charge density is no longer controlled by the breakdown strength of the air, but rather by the breakdown strength of the insulating layer, which can be 100 to 1000 times higher than that of air. Because the charge density is higher, the resulting discharge is also more energetic and can be very dangerous in the plant. These discharges have been known to have energies up to 10 Joules, and can be dangerous to operators. It is possible to avoid propagating brush discharges if the insulating layer is greater than 10 mm thick, or if the breakdown potential of the insulator is less. 2.2 Product Transfer Procedures 2.2.1 Metal to Metal Hand Transfers Mandatory Effective Date: April 2003 Rev. # X Discretionary Page 6 of 17 R E G U L A T O R Y A F F A I R S G R O U N D I N G P R O G R A M M A N U A L S E R I E S 2 0 0 P R O G R A M 2 0 0 . 1 3 The source container from which the liquid is poured is to be attached to an earthen grounding source utilizing a grounding cable designed for this purpose. The clamp will be robust and have sufficient spring force to bite through paint and dust to make a good electrical contact. A bonding mechanism must be connected between the source container and filling container. The bond can be in the form of: o A bonding wire with clamps that are robust and have sufficient spring force to bite through paint and dust to make a good electrical contact. o A design that creates a sound bond between the source and container Fill nozzles will be positioned such that the flammable/combustible liquid will free fall no more than one inch before making contact with the container anywhere within the process. The velocity of the flammable/combustible liquid entering the container is to be 3 feet/second (6.9 meters/second) or less until inlet pipe is submerged. Review employee operations: o Correct attire with antistatic characteristics. o Provide antistatic bonding. Automated Filling The stationary machine is to be attached to an earthen grounding source utilizing a grounding cable designed for this purpose. A bond must be established between the container and filling source. Fill nozzles will be positioned such that the flammable/combustible liquid will free fall no more than one inch before making contact with the container anywhere within the process. The velocity of the flammable/combustible liquid entering the container is to be 3 feet/second (6.9 meters/second) or less until inlet pipe is submerged. Review employee operations: o Correct attire with antistatic characteristics. o Provide antistatic bonding. 2.2.2 Metal to Plastic Hand Transfers Mandatory Effective Date: April 2003 Rev. # X Discretionary Page 7 of 17 R E G U L A T O R Y A F F A I R S G R O U N D I N G P R O G R A M M A N U A L S E R I E S 2 0 0 P R O G R A M 2 0 0 . 1 3 The metal source container from which the liquid is poured is to be attached to an earthen grounding source utilizing a grounding cable designed for this purpose. The clamp will be robust and have sufficient spring force to bite through paint and dust to make a good electrical contact. The plastic container to which the liquid is poured into must be bonded. The bond can be accomplished by: Establish a bond between the metal fill source and the plastic fill container by: o Place a ground rod into the container, then o Place a bond wire onto the fill container ground rod, then o Connect the bond wire to the fill source ground. The bonding clamps must be robust and have sufficient spring force to bite through paint and dust to make a good electrical contact. Fill nozzles will be positioned such that the flammable/combustible liquid will free fall no more than one inch before making contact with the container. o When possible, direct contact of fill nozzle and container should be achieved. o When possible liquid flow should be diverted to container side. The velocity of the flammable/combustible liquid entering the container is to be 3 feet/second (6.9 meters/second) or less until inlet pipe is submerged. Review employee operations: o Correct attire with antistatic characteristics. o Provide antistatic bonding. Automated Filling The stationary machine is to be attached to an earthen grounding source utilizing a grounding cable designed for this purpose. A bond must be established between the container and filling source. A bond can be created by: o Wetting the exterior surface of the container, maintaining a wet conveyor belt, and achieving a ground by physical contact with equipment. o Position fill nozzle such that the flammable/combustible liquid will free fall no more than one inch before making contact with the container. Mandatory Effective Date: April 2003 Rev. # X Discretionary Page 8 of 17 R E G U L A T O R Y A F F A I R S G R O U N D I N G P R O G R A M M A N U A L S E R I E S 2 0 0 P R O G R A M 2 0 0 . 1 3 The velocity of the flammable/combustible liquid entering the container is to be 3 feet/second (6.9 meters/second) or less until inlet pipe is submerged. Review employee operations: o Correct attire with antistatic characteristics. o Provide antistatic bonding. 2.2.3 Metal to Glass Hand Transfers The metal source container from which the liquid is poured is to be attached to an earthen grounding source utilizing a grounding cable designed for this purpose. The clamp will be robust and have sufficient spring force to bite through paint and dust to make a good electrical contact Establish a bond between the metal fill source and the glass fill container by: o Place a ground rod into the container, then o Place a bond wire onto the fill container ground rod, then o Connect the bond wire to the fill source ground. The bonding clamp must be robust and have sufficient spring force to bite through paint and dust to make a good electrical contact. Fill nozzles will be positioned such that the flammable/combustible liquid will free fall no more than one inch before making contact with the container. o When possible, direct contact of fill nozzle and container should be achieved. o When possible liquid flow should be diverted to container side. The velocity of the flammable/combustible liquid entering the container is to be 3 feet/second (6.9 meters/second) or less until inlet pipe is submerged. Review employee operations: o Correct attire with antistatic characteristics. o Provide antistatic bonding. Automated Filling The stationary machine is to be attached to an earthen grounding source utilizing a grounding cable designed for this purpose. Mandatory Effective Date: April 2003 Rev. # X Discretionary Page 9 of 17 R E G U L A T O R Y A F F A I R S G R O U N D I N G P R O G R A M M A N U A L S E R I E S 2 0 0 P R O G R A M 2 0 0 . 1 3 A bond must be established between the container and filling source. A bond can be created by: o Wetting the exterior surface of the container, maintaining a wet conveyor belt, and grounding by physical contact with equipment. o Position fill nozzle such that the flammable/combustible liquid will free fall no more than one inch before making contact with the container. Fill nozzles will be positioned such that the flammable/combustible liquid will free fall no more than one inch before making contact with the container. o When possible, direct contact of fill nozzle and container should be achieved. o When possible liquid flow should be diverted to container side. The velocity of the flammable/combustible liquid entering the container is to be 3 feet/second (6.9 meters/second) or less until inlet pipe is submerged. Review employee operations: o Correct attire with antistatic characteristics. o Provide antistatic bonding. 2.2.4 Plastic to Glass Hand Transfers The plastic container from which the liquid is poured into must be grounded. The ground can be accomplished by: o Place a ground rod into the container, then o Place a ground wire onto the container ground rod, then Connect the ground wire to an earthen grounding source utilizing a grounding cable designed for this purpose. The clamp will be robust and have sufficient spring force to bite through paint and dust to make a good electrical contact. Establish a bond between the plastic source container and the glass fill container by: o Place a ground rod into the glass container, then o Place a bond wire onto the glass container ground rod, then Mandatory Effective Date: April 2003 Rev. # X Discretionary Page 10 of 17 R E G U L A T O R Y A F F A I R S G R O U N D I N G P R O G R A M o M A N U A L S E R I E S 2 0 0 P R O G R A M 2 0 0 . 1 3 Connect the bond wire to the fill source ground. The bonding clamp must be robust and have sufficient spring force to bite through paint and dust to make a good electrical contact. Fill nozzles will be positioned such that the flammable/combustible liquid will free fall no more than one inch before making contact with the container. o When possible, direct contact of fill nozzle and container should be achieved. o When possible liquid flow should be diverted to container side. The velocity of the flammable/combustible liquid entering the container is to be 3 feet/second (6.9 meters/second) or less until inlet pipe is submerged. Review employee operations: o Correct attire with antistatic characteristics. o Provide antistatic bonding. Automated Filling The automatic filling of flammable/combustible liquids into glass containers from a plastic source should not be performed due to the inability to create a proper electrostatic ground and bond. 2.2.5 Plastic to Plastic Hand Transfer The plastic container from which the liquid is poured into must be grounded. The ground can be accomplished by: o Place a ground rod into the container, then o Place a ground wire onto the container ground rod, then Connect the ground wire to an earthen grounding source utilizing a grounding cable designed for this purpose. The clamp will be robust and have sufficient spring force to bite through paint and dust to make a good electrical contact. Establish a bond between the plastic source container and the plastic fill container by: o Place a ground rod into the plastic container, then o Place a bond wire onto the source container ground rod, then Mandatory Effective Date: April 2003 Rev. # X Discretionary Page 11 of 17 R E G U L A T O R Y A F F A I R S G R O U N D I N G P R O G R A M o M A N U A L S E R I E S 2 0 0 P R O G R A M 2 0 0 . 1 3 Connect the bond wire to the fill source ground. The bonding clamp must be robust and have sufficient spring force to bite through paint and dust to make a good electrical contact. Fill nozzles will be positioned such that the flammable/combustible liquid will free fall no more than one inch before making contact with the container. o When possible, direct contact of fill nozzle and container should be achieved. o When possible liquid flow should be diverted to container side. The velocity of the flammable/combustible liquid entering the container is to be 3 feet/second (6.9 meters/second) or less until inlet pipe is submerged. Review employee operations: o Correct attire with antistatic characteristics. o Provide antistatic bonding. Automated Filling The automatic filling of flammable/combustible liquids into plastic containers from a plastic source should not be performed due to the inability to create a proper electrostatic ground and bond. 2.2.6 Glass to Glass Hand Transfer The glass container from which the liquid is poured into must be grounded. The ground can be accomplished by: o Place a ground rod into the container, then o Place a ground wire onto the container ground rod, then Connect the ground wire to an earthen grounding source utilizing a grounding cable designed for this purpose. The clamp will be robust and have sufficient spring force to bite through paint and dust to make a good electrical contact. Establish a bond between the glass source container and the glass fill container by: o Place a ground rod into the glass fill container, then o Place a bond wire onto the source container ground rod, then Mandatory Effective Date: April 2003 Rev. # X Discretionary Page 12 of 17 R E G U L A T O R Y A F F A I R S G R O U N D I N G P R O G R A M o M A N U A L S E R I E S 2 0 0 P R O G R A M 2 0 0 . 1 3 Connect the bond wire to the fill source ground. The bonding clamp must be robust and have sufficient spring force to bite through paint and dust to make a good electrical contact. Fill nozzles will be positioned such that the flammable/combustible liquid will free fall no more than one inch before making contact with the container. o When possible, direct contact of fill nozzle and container should be achieved. o When possible liquid flow should be diverted to container side. The velocity of the flammable/combustible liquid entering the container is to be 3 feet/second (6.9 meters/second) or less until inlet pipe is submerged. Review employee operations: o Correct attire with antistatic characteristics. o Provide antistatic bonding. Automated Filling The automatic filling of flammable/combustible liquids into glass containers from a glass source should not be performed due to the inability to create a proper electrostatic ground and bond. 2.3 Waste Transfer Procedures 2.3.1 Metal to Metal The filling container to which the liquid is poured is to be attached to an earthen grounding source utilizing a grounding cable designed for this purpose. The clamp will be robust and have sufficient spring force to bite through paint and dust to make a good electrical contact. A bonding mechanism must be connected between the source container and filling container. The bond can be in the form of: o A bonding wire with clamps that are robust and have sufficient spring force to bite through paint and dust to make a good electrical contact. o A design that creates a sound bond between the source and container A self-closing funnel with extended fill tube that reaches the bottom of the container will be used when filling container. The spout of the transfer container must be in direct contact with the funnel when pouring. Mandatory Effective Date: April 2003 Rev. # X Discretionary Page 13 of 17 R E G U L A T O R Y A F F A I R S G R O U N D I N G P R O G R A M M A N U A L S E R I E S 2 0 0 P R O G R A M 2 0 0 . 1 3 Slowly pour the waste liquid directly onto the funnel side. Review employee operations: o Correct attire with antistatic characteristics. o Provide antistatic bonding. 2.3.2 Plastic to Metal The filling container to which the liquid is poured is to be attached to an earthen grounding source utilizing a grounding cable designed for this purpose. The clamp will be robust and have sufficient spring force to bite through paint and dust to make a good electrical contact. A self-closing funnel with extended fill tube that reaches the bottom of the container will be used when filling container. Establish a ground for the plastic transfer container. o Place a ground rod into the transfer container. o The ground rod will be connected to the metal container utilizing a bonding wire. The bonding clamps must be robust and have sufficient spring force to bite through paint and dust to make a good electrical contact. The spout of the transfer container must be in direct contact with the funnel when pouring. Slowly pour the waste liquid directly onto the funnel side. Review employee operations: o Correct attire with antistatic characteristics. o Provide antistatic bonding. 2.3.3 Glass to Metal The filling container to which the liquid is poured is to be attached to an earthen grounding source utilizing a grounding cable designed for this purpose. The clamp will be robust and have sufficient spring force to bite through paint and dust to make a good electrical contact. A self-closing funnel with extended fill tube that reaches the bottom of the container will be used when filling container. Establish a bond between the glass fill source and the metal fill container by: o Placing a bond wire onto the fill container ground rod. Mandatory Effective Date: April 2003 Rev. # X Discretionary Page 14 of 17 R E G U L A T O R Y A F F A I R S G R O U N D I N G P R O G R A M o M A N U A L S E R I E S 2 0 0 P R O G R A M 2 0 0 . 1 3 Connect the bond wire to the fill container. The bonding clamps must be robust and have sufficient spring force to bite through paint and dust to make a good electrical contact. The spout of the transfer container must be in direct contact with the funnel when pouring. Slowly pour the waste liquid directly onto the funnel side. Review employee operations: o Correct attire with antistatic characteristics. o Provide antistatic bonding. 2.3.4 Metal to Plastic The stationary plastic container to which the liquid is poured must be grounded. The ground can be accomplished by: o Placing a ground rod into the container and connect it to an earthen ground. Ground rod must make a tight seal with container opening. The ground clamps will be robust and have sufficient spring force to bite through paint and dust to make a good electrical contact. A self-closing funnel with extended fill tube that reaches the bottom of the container will be used when filling container. Establish a bond between the metal fill source and the plastic fill container by: o Placing a bond wire onto the fill container ground rod. o Connect the bond wire to the fill source container. The ground and bonding clamps must be robust and have sufficient spring force to bite through paint and dust to make a good electrical contact. Establish a ground for the funnel by: o Placing a bond wire between the fill container ground rod and funnel. The bonding clamps must be robust and have sufficient spring force to bite through paint and dust to make a good electrical contact. The spout of the transfer container must be in direct contact with the funnel when pouring. Slowly pour the waste liquid directly onto the funnel side. Review employee operations: Mandatory Effective Date: April 2003 Rev. # X Discretionary Page 15 of 17 R E G U L A T O R Y A F F A I R S G R O U N D I N G P R O G R A M M A N U A L S E R I E S 2 0 0 P R O G R A M 2 0 0 . 1 3 o Correct attire with antistatic characteristics. o Provide antistatic bonding. 2.3.5 Plastic to Plastic The stationary plastic container to which the liquid is poured must be grounded. The ground can be accomplished by: o Placing a ground rod into the container and connect it to an earthen ground. Ground rod must make a tight seal with container opening. A self-closing funnel with extended fill tube that reaches the bottom of the container will be used when filling container. Establish a ground for the funnel by: o Placing a bond wire between the fill container ground rod and funnel. The bonding clamps must be robust and have sufficient spring force to bite through paint and dust to make a good electrical contact. Establish a bond between the plastic fill source and the plastic fill container by: Placing a ground rod into the plastic transfer container. o Placing a bond wire onto the fill container ground rod. o Connect the bond wire to the fill source container ground rod. The ground and bonding clamps must be robust and have sufficient spring force to bite through paint and dust to make a good electrical contact. The spout of the transfer container must be in direct contact with the funnel when pouring. Slowly pour the waste liquid directly onto the funnel side. Review employee operations: o Correct attire with antistatic characteristics. o Provide antistatic bonding. 2.3.6 Glass to Plastic The stationary plastic container to which the liquid is poured into must be grounded. The ground can be accomplished by: o Placing a ground rod into the container and connect it to an earthen ground. Ground rod must make a tight seal with container opening. Mandatory Effective Date: April 2003 Rev. # X Discretionary Page 16 of 17 R E G U L A T O R Y A F F A I R S G R O U N D I N G P R O G R A M M A N U A L S E R I E S 2 0 0 P R O G R A M 2 0 0 . 1 3 A self-closing funnel with extended fill tube that reaches the bottom of the container will be used when filling container. Establish a ground for the funnel by: o Placing a bond wire between the fill container ground rod and funnel. The bonding clamps must be robust and have sufficient spring force to bite through paint and dust to make a good electrical contact. Establish a bond between the glass fill source and the plastic fill container by: o Placing a ground rod into the glass transfer container. o Placing a bond wire onto the fill container ground rod. o Connect the bond wire to the fill source container ground rod. The ground and bonding clamps must be robust and have sufficient spring force to bite through paint and dust to make a good electrical contact. The spout of the transfer container must be in direct contact with the funnel when pouring. Slowly pour the waste liquid directly onto the funnel side. Review employee operations: o Correct attire with antistatic characteristics. o Provide antistatic bonding. 2.4 Training Each employee involved in the process of transferring flammable or combustible liquids form one container to another container will be trained on the procedures described within the Grounding/Bonding Program. Employees that perform flammable or combustible liquid transfers must demonstrate an understanding of the program and possess the skills necessary to apply grounding and bonding equipment. Awareness training of grounding/bonding program will be provided to employees working in areas where grounding/bonding is performed. Training is to be documented using the Fisher Scientific record of Environmental, Safety and Health Training with an outline of the training review attached. Retraining will be provided when employee does not demonstrate program procedural requirements or on an annually. Mandatory Effective Date: April 2003 Rev. # X Discretionary Page 17 of 17