Need bonding or not?

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sbarkah

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We're transfering our reject crude oil (hydrocarbon)from our tank to other vessel by using hoses.
Before transfer the reject oil we're jetting the tank with sea water in order to be more low concentrate the reject oil.
Are we required to bonding the hose for jetting sea water to the reject oil tank?
If required, we've got 78 Ohm. But I heard that the resistance maximum for bonding is 2 Ohm.
Please advise me. Thank.

sbarkah
 
Re: Need bonding or not?

This is something you need to ask your company about. Is it standard policy in the industry? No.

[ January 12, 2004, 04:36 AM: Message edited by: mclain ]
 
Re: Need bonding or not?

To: sbarkah, Where I worked in industry, we would call this fault and static. Anytime that you have materials flowing in a pipeline, you are going to have static electricity build-up. How you control this is the following: You would make sure that all of your piping has good continuity to ground.
Then any static that builds up will go to ground.
This is extremely important in a area of a Hazardous Electrical Classification, such as Class 1, Division 1, Groups A,B,C,D. 1-1-A,B,C,D.
or 1-2-A,B,C,D.
I personsally would recommend anytime that you have a situation of a buildup of static electricity, that you have it controlled by grounding.
 
Re: Need bonding or not?

friebel,
I personsally would recommend anytime that you have a situation of a buildup of static electricity, that you have it controlled by grounding.
Click to expand...
Is a connection to earth required to control static, or just bonding between the parts of the transfer system and the containers?
Don
 
Re: Need bonding or not?

Sbarkah in your post you said if you need bonding you have 78 ohms. Where did you measure 78 ohms. You also said you use a salt water hose. Is this hose rubber, canvas or metal piping? What type of hose do you use to pump the diluted mixture to the other vessel? Is this hose bonded?

Don McLain
 
Re: Need bonding or not?

TO: don_resqcapt19, Don, in answer to your question, it has been my experience that you should bond all of your piping, and have it connected to ground. Now their is not a danger if you are not in a hazardous classified area such as 1-1-A,B,C,D. or 1-2-A,B,C,D.
I just said their is not a danger, but their could be a pretty good charge of static electricity build up and then discharge, giving you a good jolt.In the Chemical plant where I worked, we had a policy of checking all piping, tanks, steel for continuity to ground. We would want to see no more than 1 ohms of resistance to ground. But again we were in a electrical classified area.We called this a Fault & Static Inspection, and we did this on a annual basis in a hazardous area.
 
Re: Need bonding or not?

friebel,
If the static is created by the product moving through the system. How can any static build up if all of the parts of the transfer system are bonded?
Don
 
Re: Need bonding or not?

To: don_resqcapt19. Don, you are asking a very good question, one that I feel that I can answer.
I am going to give you an incident that happen to our plant, when I was in the Design department. I worked on a plant that had about 8000 employees.
My boss called me at home and asked if I would go into the plant to look at a bad situation. He said the fire department has the area roped off and the area in question is a Class 1, Divison 2, Group D. The room was about 75 feet by 75 feet in area. The floor was concrete, and the area had painted the floor with an epoxy paint. The area was in a shutdown, and their was a white powder all over the floor. When the personnel would walk on the floor they were actually building up a charge of static electricity, and that floor was waiting to dischage that electrical static charge.
What I did was to get a water hose and I played it gently on the floor, and the water was running to an open grated ditch 12 inches by 12 inches.
As the water was running to the ditch, we had arcing all along the path of water going to the ditch, just like a capacitor discharging. When it got to the ditch the charge was completly discharged because of the steel and grating that had continuity to ground.
I relate this to a material flowing through a pipe. Static electricity is going build up on the pipe if we do not have it bonded to ground. This is why we ground a tank truck when it comes in to be loaded or unloaded. We ground the truck and also the piping where the material is flowing.
I was in the U.S. Navy and one of my jobs was to gas up airplanes. You would always ground the plane and also the gas hose to the plane.
Don, I do appreciate your questions, that is what makes us better electricians.
 
Re: Need bonding or not?

Friebel I have a question on bonding of hoses. I worked off shore for 10 or more years and we took on diesel from workboats. We never gave any thought to running a bonding jumper between the two vessels(ship/boat). The hose was a 4 or 6? wire braded enforced rubber hose. The hose had brass camlock fittings on each end. The hose was connected to metal piping that was welded in place to the metal decking. We always assumed that the vessels (ship/boat) setting adjacent to each other in salt water would need no bonding. What was the practice in the navy as far as bonding two vessels (ship/boat) while transferring fuel.

Don McLain

[ January 13, 2004, 12:17 PM: Message edited by: mclain ]
 
Re: Need bonding or not?

Friebel, our plant has clasification HazLoc Class 1 Div. 2. I agree with your statement that bonding is extremely important in this area especially there will build static electricity.

Mclain, we transferring crude oil (hydrocarbon)from our facility (offshore) to by hose 3-4" wire braded enforced rubber hose. It has brass camlock fitting on each end. One of the end of the hose will be connected to the flange of the pipe of fire water tank which is to be welded to deck (floating ground). And other end hang in our tank (not connected to ground). After the hose connected to the flange, I measured the resistance between hose's brass to deck/ground then got 35 Ohm.
Does the hose need bonding? If yes, where will the bonding be installed?
 
Re: Need bonding or not?

Friebel, our plant has clasification HazLoc Class 1 Div. 2. I agree with your statement that bonding is extremely important in this area especially there will build static electricity.

Mclain, we transferring crude oil (hydrocarbon)from our facility (offshore) to SHIP by hose 3-4" wire braded enforced rubber hose. It has brass camlock fitting on each end. One of the end of the hose will be connected to the flange of the pipe of fire water tank which is to be welded to deck (floating ground). And other end hang in our tank (not connected to ground). After the hose connected to the flange, I measured the resistance between hose's brass to deck/ground then got 35 Ohm.
Does the hose need bonding? If yes, where will the bonding be installed?
 
Re: Need bonding or not?

Your company should have a policy book on bonding/grounding that covers what should be bonded. The next question would be how do you bond a rubber hose?
 
Re: Need bonding or not?

Our rubber hoses has spiral wire inside the hose.
I did to continuity then get 35 & 45 Ohms.
 
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