Pex AL Pex for gas

Is been available overseas for sometime.

I’m wondering if my pex-al-pex pressing tongues will work with it?

The firefighter in me says nope and seeing first hand the failures that occur in pex during a structure fire. Granted we always shut off the gas to a house when we arrive and the house is on fire. It's those few minutes before we arrive that would have me concerned, especially if it's in a house with modern construction methods. All that OSB in new builds is basically compressed gasoline when it burns. Using poly gas pipe underground no problem. Ill stick with black pipe inside. Here is the European standard that's listed on the cut sheet of that tubing.

https://www.peroni.com/lang_UK/_download/EN_Reaction_to_Fire_Classification.pdf

It does however have an aluminum layer. If you have a fire intense enough to melt the aluminum, melting the thin stainless of csst isn't far off.

Like most building materials that are approved these days it meets "code", but is it the best choice? Case in point. Stick build homes where the trusses were built on site and nailed have less failure rate in a fire than those trusses using gusset plates. Sheath those gusset plate trusses in OSB and you loose the roof integrity very quickly under fire conditions. But hey at least it was cheaper to build lol. 
We have have a few fires where the house was piped in PEX for the water lines and melting of the PEX actually helped suppress the fire. Having seen that not totally sold on poly tube for gas pipe in a home. Underground where the likelyhood of fire is much less no problem. One might argue but what if a gas main in poly pipe gets hit and broken. Most of the time when mains get hit they are too fuel rich to burn. 
@ChrisJ google UL legacy fuel vs modern fuel. You will see time lapse videos of rooms containing old furniture vs new furniture and the time it takes to reach flashover temps.

@mattmia2 somewhat accurate if you are referring to a single family home that is standalone. It's a bit different when you get into multi family construction like condos , apartments and townhomes. Where codes most likely dictate a fire stop or partition between units. In this case they are trying to stop the spread between units. One of the reasons some places get all worked up about fire caulk around mechanical pipes / conduit / etc passing through walls in this type of construction. Heck even regular drywall has a fire resistive properties and that hollow core door in your bedroom. Google close before you doze. The UL has a awesome video showing how simply closing a door in your bedroom helps stop fire spread. It's worth a watch

There’s also a bonding/ground issue.

mattmia2 said:

There’s also a bonding/ground issue.

technically the nec requires you to bond the aluminum in pex-al-pex in other applications as well. not sure if the fittings accomplish this or not.

I’ve never heard of this. Can you cite the code section that requires this for pex-al-pex?

This is specific to plumbing and you could argue that it won't get energized. Normally this requirement is covered by the equipment it is connected to being bonded through the equipment grounding conductor and it being connected to the metallic parts of the equipment. Also brings in to question the legality of dielectric fittings. I thought there was a more general section applying to all metalic building components but I can't find that at the moment.

If this is now ok, can we have close nipples and 1 nominal size reducing bushings?