Gas pipe sizing--summation method Q

EBEBRATT-Ed

The ductwork will already be bonded by the Equipment Grounding Conductor that feeds the equipment connected to the ductwork, etc. air conditioner or furnace as long as there are no canvas connectors in the ductwork. If they are canvas connectors bond around them

Zel

OK, folks, I ended up doing hard pipe. There was just too much complication and uncertainty for me in this situation.
Thanks to everyone who helped, especially on the calculations.

Zel

Actually, one more question. Does the cooktop gas regulator need to be mounted oriented vertically? I have shelves beneath and I am trying to keep the connector and regulator out of danger.
My supply line is coming into the cabinet horizontally, so it could be mounted there, or I could use and elbow on the cooktop inlet and then mount the regulator. I just want to make sure there is no reason not to turn the regulator horizontal.
For reference, it is pretty much this one: http://m.homedepot.com/p/Whirlpool-36-in-Gas-Cooktop-in-Stainless-Steel-with-5-Burners-including-15000-BTU-SpeedHeat-Burner-WCG51US6DS/205526166

ChrisJ

Zel said:

Actually, one more question. Does the cooktop gas regulator need to be mounted oriented vertically? I have shelves beneath and I am trying to keep the connector and regulator out of danger.

My supply line is coming into the cabinet horizontally, so it could be mounted there, or I could use and elbow on the cooktop inlet and then mount the regulator. I just want to make sure there is no reason not to turn the regulator horizontal.

For reference, it is pretty much this one: http://m.homedepot.com/p/Whirlpool-36-in-Gas-Cooktop-in-Stainless-Steel-with-5-Burners-including-15000-BTU-SpeedHeat-Burner-WCG51US6DS/205526166

I highly doubt it matters, but I'd look up the instructions to the regulator and see what it says to be sure.

Whenever in doubt, whip the data sheet out.

Zel

Well, I was looking at the cooktop install doc. It makes a point to say that the arrow on the reg should be pointing to the bottom of the cooktop, but I suspect that refers to the flow of gas. An alternate install shows the reg mounted after the valve, which is vertical. In other words, insufficient data.

Tim McElwain

It can be mounted horizontally or vertically just make sure the vent on the regulator is not blocked by any cabinets or shelves.

Zel

Thanks, Tim. I figured out the right number to look up and got it from the manufacturer's site. It said there would be a slight decrease in output. They did note certain models that needed to be upright, but not mine.

gennady

https://www.dropbox.com/s/9bhszzzzozblb4a/gas line sizing.pdf?dl=0

BTW, unions on gas line are illegal. (in New York)

ChrisJ

gennady said:

https://www.dropbox.com/s/9bhszzzzozblb4a/gas line sizing.pdf?dl=0

BTW, unions on gas line are illegal. (in New York)

Just another reason to never live in NY.
I'd love to know how you hard pipe something without a union. Spin the water heater around until it's tight?

gennady

We are using left right couplings in rare occasions. Unions allowed after appliance gas valves.

ChrisJ

gennady said:

We are using left right couplings in rare occasions. Unions allowed after appliance gas valves.

Between me and you, don't you think that's a silly rule?
They're ok after appliance shutoffs, because if it leaks there it's somehow less dangerous than anywhere else?

I understand you must follow what code says, I'm just saying.

Rich_49

gennady said:

We are using left right couplings in rare occasions. Unions allowed after appliance gas valves.

Well , then they are not illegal are they Gennady ? Unions must be accessible in New Jersey , cannot be buried . Similar to junction boxes for electrical installs

EBEBRATT-Ed

So you need to cut a tee into a existing main. Guess you have to take all the piping apart if you can't use a union.

Left right couplings. I know they were used in the old days. can you still buy them?? do they even have dies available to cut left hand threads in the field??

rick in Alaska

In our area, we can use unions on the main piping, but only outside, and you have to have a valve just before them. Inside the house, we can use them on the appliances only, but again, right after the valve. I heard one of the other local contractors say we can't use left/right couplings though. The rules seem to change weekly though.
Rick

ChrisJ

> @rick in Alaska said:
> In our area, we can use unions on the main piping, but only outside, and you have to have a valve just before them. Inside the house, we can use them on the appliances only, but again, right after the valve. I heard one of the other local contractors say we can't use left/right couplings though. The rules seem to change weekly though.
> Rick

Do the unions know they can only leak when the valve is off. Or....? Otherwise not seeing the point in this rule.

Rich_49

@ChrisJ

You have your entire life to be a Tool . Why don't you take a day off occasionally ?

The rule makes complete sense as you can turn off gas and open a union to perform work . There should always be a valve between a union and the meter .

ChrisJ

Rich said:

@ChrisJ

You have your entire life to be a Tool . Why don't you take a day off occasionally ?

The rule makes complete sense as you can turn off gas and open a union to perform work . There should always be a valve between a union and the meter .

@Rich Why don't you go haunt someone else? Did you miss the forum rule about being nice or just forget about it? I don't appreciate being insulted nor was it called for.

According to Rick "In our area, we can use unions on the main piping, but only outside, and you have to have a valve just before them."

That doesn't make any sense. It doesn't say a valve 100 foot from it outside at the meter, it says just before it. With your reasoning, I guess a shutoff at the gas main, or even the gas company counts. 5 feet, 100 feet, 20,000 feet, what's the difference, it's before the union right?

Perhaps I misunderstood what they mean, it happens. No reason to call names though.