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Street 90 in gas piping

Don_NJMP
Don_NJMP Member Posts: 1
in Gas Heating

In the US, I can not find in the gas codes where it prohibits the use of a street 90.

The reasons I've seen for not using one do not make sense. Not at least with modern street 90s (if there is any difference).

Two 90s and a close nipple can not replace a 90 and street 90. Two 90s and a close nipple have a higher chance of not fully sealing then a street 90 and 90.

Unless prohibited by Code, there isn't any reason not to use a street 90.

Comments

  • Steamhead
    Steamhead Member Posts: 17,669
    edited March 24

    Gas inspectors around here don't like them. And they don't like close nipples either. Or bushings.

    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
    Consulting
    Mad Dog_2
  • delcrossv
    delcrossv Member Posts: 2,035

    Only comment I've gotten is put the street on the top, plain ell on the bottom.

    Guess that's because you cant ream a street. (?)

    Trying to squeeze the best out of a Weil-McLain JB-5 running a 1912 1 pipe system.
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 17,452

    Bushings not allowed in MA where I am. I have never heard of a code that did not allow street 90s or close nipples, but I would avoid both if possible JMHO. I never used a street unless a nipple and two elbows were impossible. I would rather a close nipple than a street

    I have seen specs written for commercial jobs where close nipples and street elbows are not allowed by the engineer.

  • ChrisJ
    ChrisJ Member Posts: 16,537
    edited March 24

    You need to make sure you look at your local code specifically.

    I see no mention in NJ's gas code of even bushings not being allowed, just cast iron bushings are not.

    Cast iron bushings is #3. No mention of street 90s.

    I'm really surprised other cast iron fittings are allowed. It does mention in another section that cast iron pipe is NOT allowed but I guess most fittings are.

    NJ bushing.JPG

    @EBEBRATT-Ed Can you do a screenshot of where MA's code says no bushings are allowed at all?

    @Steamhead I was told inspectors around here don't like plugs in tees, only a nipple and a cap. Yet, I see nothing in the code about it.

    Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.

  • Neild5
    Neild5 Member Posts: 203

    In the Chicago suburbs the local gas company has street 90's going into most meters.

    PeteAdelcrossv
  • GGross
    GGross Member Posts: 1,456
    https://forum.heatinghelp.com/discussion/comment/1849636#Comment_1849636

    I think the issue that comes in to play with bushings is that when transitioning a single pipe size the inspector can't tell if it is cast iron or malleable, at least that's what they tell me (michigan). So we are allowed to use them but only for transitioning multiple sizes. Most guys just use couplings and nipples because it doesn't really make sense and the inspector can always just say he can't tell what type of bushing it is, kind of bogus.

  • pecmsg
    pecmsg Member Posts: 5,836
    https://forum.heatinghelp.com/discussion/comment/1849638#Comment_1849638

    Most gas suppliers dont have to follow OUR rules!

    GGross
  • mattmia2
    mattmia2 Member Posts: 12,142

    Didn't think you could use compression on gas, at least on copper.

    what is flareless?

  • ChrisJ
    ChrisJ Member Posts: 16,537
    https://forum.heatinghelp.com/discussion/comment/1849643#Comment_1849643

    Same with electrical as well.

    They do what they want.

    Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.

  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 17,452

    I am surprised NJ allows CI fittings. They are a no no here except I think there is some allowance for fittings over 4" and maybe CI flanges are ok …..will have to look.

    Maybe some inspectors don't like plugs because plugs are CI except in small sizes where caps are usually malleable. I used to see some really old jobs with CI caps.

    It can get confusing. MA does not allow any galvanized but other states do. MA adopts the NFPA 54 for Natural and 58 for propane but then they have a few pages of their own amendments

  • pecmsg
    pecmsg Member Posts: 5,836
    edited March 24
    https://forum.heatinghelp.com/discussion/comment/1849668#Comment_1849668

    they have rules they have to follow also.

    Now what Greenport power and light does isn’t allowed in Suffolk County

  • PeteA
    PeteA Member Posts: 256

    The utilities definitely have tons of rules and EO's that get followed (electric, gas and steam) but they do not line up with the code books that everyone else is guided by. I can't tell you how many times I was left scratching my head when we would install a #2/0 copper service and connect it to the electricians 600mcm copper or 2 sets of 500mcm copper cables. One side working on load cycles and the other side working on connected loads, big difference in the amount of copper required.

  • mattmia2
    mattmia2 Member Posts: 12,142
    https://forum.heatinghelp.com/discussion/comment/1849691#Comment_1849691

    It is in open air so it isn't going to burn up but it seems like voltage drop would be an issue.

  • PeteA
    PeteA Member Posts: 256
    https://forum.heatinghelp.com/discussion/comment/1849693#Comment_1849693

    no i worked 36 years in Manhattan all underground work only 2 poles in the city none with services :). You'd be surprised to see what feeds some of those buildings, the calculation is done completely differently. They do run warm sometimes but it lasts for many, many years without issue so they get their monies worth out of it. I've taken the lead off of some of the cables we've replaced in the ground and some was almost a hundred years old.

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