Author Topic: Csst piping right off the meter  (Read 226 times)

Offline Hvacpimp

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Csst piping right off the meter
« on: April 11, 2019, 04:00:57 PM »
Does anyone know the code and how many inches of black iron piping has to be off the meter. Some people say 18" and some say 24" of black iron before the csst. I've scanned a couple of manuals but haven't been able to find it. Any help would be great. Thanks!!

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Re: Csst piping right off the meter
« Reply #1 on: April 11, 2019, 05:57:10 PM »
The Gas Code allows it if the meter is supported.

Quote
Clause 6.14.8 - Corrugated stainless steel tubing (CSST) or copper tubing shall not be used to connect to a meter, unless the meter assembly is independently supported.

It really depends on your gas distributor and CSST manufacturer.  Most distributors still allow connecting CSST to a meter when installed in a meter box.  Enbridge wants 24” of rigid otherwise.

Download the Enbridge Meter Connections to Flexible Supply Piping Bulletin - Here

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There shall be a minimum of 0.6m (2ft.) of black iron piping from the meter outlet before transitioning to flexible tubing. The piping shall be adequately supported to the wall to prevent stress on the meter and/or transition fitting.

The Gas Tite manual says,

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4.5 METER - The gas piping for the meter stub-out is usually subject to local requirements such as size, location, and material type. It is always important to confirm local code and utility requirements. Gastite®/FlashShield recommends the use of 1/2" CSST or greater as the minimum trunk line size. Size 3/8" should not be used for trunk lines. This will allow for the addition of future gas appliances and minimize the opportunity for whistling.

a) Unsupported Meters – Meters that depend on the service supply line and/or the house piping for support shall not be directly connected to the Gastite®/FlashShieldTM CSST. As shown in the Figures 4-51 and 4-52, a rigid connection point is created using a Gastite®/FlashShieldTM termination fitting, Gastite® designed stub-out or rigid pipe components.

b) Self-Supported Meters – Meters that are independently supported with a bracket can be directly connected to the Gastite®/FlashShieldTM CSST as shown in Figure 4-53. If practical, direct Gastite®/FlashShieldTM CSST connections shall include a 3 to 6 inch loop of tubing (as shown) to accommodate differential settling and meter movement. No mechanical protection of the tubing is required for outdoor meter connections; however, ensure that the local utility supports this practice as some utilities have regulations specifying meter attachments.

Offline Porcupinepuffer

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Re: Csst piping right off the meter
« Reply #2 on: April 14, 2019, 08:52:51 AM »
I recall a minimum 2' with 2 pipe hangers. This was required for the newer style meters that are supported to the wall near the lower portion of the riser by their shut off valve. They require this since their 3 elbow swing joint would never move if frost raises/lifts the piping. It would simply move the easiest component, which is the CSST.
The old style meters with the higher clamp didn't require it.

Offline Hvacpimp

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Re: Csst piping right off the meter
« Reply #3 on: April 14, 2019, 11:05:52 PM »
You guys are amazing, thank you so much. I run into this quite a bit and have been tagging for this now I can back it up in writing not only hear say. Thankfully I have been using the same clause as mentioned above lol.  As for the csst off of the meter in a meter box, it is allowed only if there is a piece of wood underneath to support it.
Thanks again!

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Re: Csst piping right off the meter
« Reply #4 on: April 15, 2019, 04:15:32 AM »
The wood is required and supplied by Enbridge.  It really has nothing to do with supporting the gas meter.  Its purpose is to keep the gas meter above the bottom lip of the meter box, so it can be removed easily.