bonding CSST

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Old 04-29-14, 11:46 AM
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bonding CSST

I'm trying to properly bond a length of flexible propane tube. A 500 gallon tank is buried 50' from home, iron pipe then it enters the basement. It runs essentially the length of the basement where it re-emerges outside at the standby generator, which is located very near the entrance panel, meter, and GEC/rods. The code calls for #6 min. attached near building penetration, going to bonding system. Would it be reasonable to bond the end nearest the service entrance? Exact wording of the code references downstream of the meter and doesn't describe the case where the CSST enters a building and then exits the same building.
 
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Old 04-29-14, 11:59 AM
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Is there already a #6 to the black iron gas line? The NEC does not cover the bonding of CSST.
 
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Old 04-29-14, 12:12 PM
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CSST bonding is a little confusing. The actual CSST pipe is not bonded.... the black iron is. The PDF below explains it.
 
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Old 04-29-14, 12:58 PM
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The referenced bulletin does specify "a single bond connection shall be made
downstream of the individual gas meter for each housing unit and upstream of the first CSST connection." So, if the same CSST penetrates the building twice, I can choose either end to bond? That is my question.
 
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Old 04-29-14, 01:30 PM
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The black iron feeding the CSST get the bond, not the flex itself.
 
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Old 04-29-14, 01:51 PM
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PCboss is correct. It states right in that PDF that the CSST does not get a bond connected to it.
 
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Old 04-29-14, 02:22 PM
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You need to bond the black pipe before it enters the house.
Fuel gas code 7.13.2
 
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Old 04-29-14, 02:51 PM
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I thinks its..... "at the point where it enters the house."
I don't think it has to be before it enters.
 
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Old 04-29-14, 03:06 PM
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A 500 gallon tank is buried 50' from home, iron pipe then it enters the basement.
doesn't describe the case where the CSST enters a building and then exits the same building.


Can you be more clear on what you have first of all..

You have iron pipe buried?
You have csst buried?
Whats in the home and what exits?

I assume permits were taken out?

I ask because code dictates no burial of either pipe you mention. AFAIK...
 
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Old 04-29-14, 03:24 PM
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Iron pipe only is buried. A shutoff is at the outside, a transition occurs just inside the home. CSST is run clear thru the basement to the far end of the home; a continuous length. The CSST then exits the basement to service a generator with connection to iron pipe, a regulator, and then the generator itself. This flex run services only the genset. 2009 and later gas code seems to apply as reported by my home inspector. The run is not directly bonded. My plan is to bond the generator side iron pipe to a close-by GEC. Seem to make sense?
 
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Old 04-29-14, 03:37 PM
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The CSST then exits the basement to service a generator with connection to iron pipe,

CSST cannot run outside. There must be a transition on the gen side too.

Iron pipe only is buried.
Was this inspected and passed? Did they tar the iron pipe? You sure they did not bury poly pipe and the iron you see are just the risers at the house side?

Before we talk about bonding it is my opinion that we establish the install was performed too code.

No sense bonding it if you have csst outside. A lightning strike to the csst will probably just blow the house up...Or burn it down..
 
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Old 04-29-14, 06:43 PM
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CSST bonding is a little confusing. The actual CSST pipe is not bonded.... the black iron is. The PDF below explains it.
To make the bonding of CSST even a little more confusing, here is yet another code opinion.

Code Question of the Day Archives | NECA-NEIS
 
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Old 04-29-14, 07:29 PM
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The two pieces of black iron could be bonded with a jumper between the two sections.
 
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Old 04-30-14, 07:28 AM
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lawrosa: Correction; I don't have iron pipe running to the buried 500 gal tank, its flexible "rubber" hose; in any case, not CSST. CSST is only in dry space in the ceiling area of the basement.

PJ: it appears the gas code was strengthened in 2009, with "direct bonding" now a requirement. THat is, no longer approved to only use gas appliance grounding; you must now use a separate 6AWG bonding conductor. I suppose they see lightning flashover as a threat to the indoor .08" wall SS corrugated tubing.

New disclosure: I have gas leaks outside, near the generator. A fairly major one out of the regulator vent, and some minor ones at taped joints in the iron piping. Looks like some piping rework will be in short order; I like PST as pipe dope, but I haven't ever worked with propane systems. Agree that teflon tape is a NO-NO?
 
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Old 04-30-14, 12:04 PM
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I believe pipe dope is used on gas pipe, not teflon.
 
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Old 04-30-14, 12:43 PM
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where it re-emerges outside at the standby generator,
Does the csst leave the home on the generator side???

Csst fittings at the ends are flared. No joint compound or tape required..

I don't have iron pipe running to the buried 500 gal tank, its flexible "rubber" hose;
Rubber???? Are you sure, or how do you know this?

That of course is not an approved underground material...

I would like to ask you again... were permits taken out for this job?
 
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Old 05-02-14, 03:24 PM
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Law: yes, permitted job, but before my time here. The buried hose is PE, ASTM D-2513 cat 1 rated. No CSST outside.
 
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Old 05-02-14, 05:49 PM
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OK so PE from tank to house..

Is there one of these at the end of the home on the tank side? It should be a steel riser sticking out of the ground.

[ATTACH=CONFIG]31031[/ATTACH]

RThen from there should go in the home with threaded pipe...

Then CSST in basement.

Then threaded pipe to other side of csst and out to gen..

Is this correct?

Sometimes bulk head transitions are uses at each end of the home..( I use these all the time..)

[ATTACH=CONFIG]31032[/ATTACH]
 
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Old 05-03-14, 07:42 AM
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From the flexible PE, it does fit to a rated fitting, and i'm not sure it's purpose. About 4" long, hex female both ends, same manufacturer as the PE tube. THen a quarter turn shut off, then iron piping to a T, when one leg has a regulator, then iron pipe all the way to service a furnace and a WH, the other line also enters the basement, fitted to the CSST, headed to the genset.
 
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