Perfect Flame GSN3318N

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by rbest23, Mar 31, 2009.

  1. rbest23

    rbest23 New Member

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    I have a GSN3318 propane grill from perfect flame. It has 4 main burners, a side burner and a back burner for the rotisserie. I want to convert this to natural gas but I am having problems getting correct orifice sizing. Perfect flame makes a natural gas version identical to what I have and when I contact the company to get replacement parts all they could tell me is the parts are out of stock. Look for direction on what drill size I need and where to get replacement orifice blanks in the event I screw up, not that I will. Thanks
     
  2. kingsotall

    kingsotall Plunger/TurdPuncher

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    What are you going to do about the regulator¿
     
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  4. hj

    hj Moderator & Master Plumber Staff Member

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    orifice

    You probably WILL screw up if you do not have a set of orifice drills, and they are not cheap. One way would be to use the drills to find out the LP orifice size and then use a conversion table to find the proper natural gas size for that same btu.
     
  5. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

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    The jets are fairly common parts, but as mentioned, you MUST also change the regulator. If you know what number they are supposed to be, a good plumbing supply store and maybe the big box stores will carry them. The number of burners is not a good guide to the size of the pipe you need...you need to know how many BTU the thing can create when all are on.
     
  6. rbest23

    rbest23 New Member

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    Would any regulator for nayural gas do? I mean one used for BBQ's

     
  7. kingsotall

    kingsotall Plunger/TurdPuncher

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    NHMaster, think we're gonna need that duct tape cranium cap...
     
  8. Redwood

    Redwood Master Plumber

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    Yea sure why not...
    It's not like anything can go wrong is it...

    [​IMG]
     
  9. nhmaster

    nhmaster Master Plumber

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    Everybody, I bring you the three second steak. :D
     
  10. kingsotall

    kingsotall Plunger/TurdPuncher

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    Season's latest BBQ attire:

    [​IMG]
     
  11. Redwood

    Redwood Master Plumber

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    It's good to be thinking about PPE but as always in order to have protection the proper equipment must be selected.

    I think this would be more appropriate...

    [​IMG]
     
  12. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

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    My last grill had a data plate on it that listed the jet size for both NG and propane. The conversion was fairly straightforward...unscrew the propane jets, screw in the NG jets, and replace the regulator, then hook up the gas line.
     
  13. kingsotall

    kingsotall Plunger/TurdPuncher

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    Jim, that's fine and dandy but this is on a whole other tangent. Drilling out orifices, slapping on a regulator from some other unit... Remember what happened with Frankenstein¿ :p
     
  14. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

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    Yes, propane and NG operate on two different supply pressures. Propane is a denser energy content gas, operates at a higher pressure, and therefore needs a smaller orifice in the jet. Drilling out a jet and getting the proper size is not as simple as just making the hole bigger with a common drill bit. Ensuring the hole is exactly the right size and there are no burrs, etc. is critical to proper operation. Get it wrong, either with the jet size or regulator and you can have a very dangerous situation.

    If you know the jet size required, you can find them from other suppliers than the original manufacturer (who almost certainly didn't make them themselves). Know the amount of BTU's required, and you can find a regulator that will work safely. Getting it all together in a safe operating condition takes care and attention to detail.
     
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