Does anyone have any experience hot tapping cast iron used for natural gas distribution, probably less than 5 psig. Want to add 4" branch on 4" and above main. Most solutions involve welding fitting to split sleeve or repair clamp, attaching the sleeve/clamp, then hot tapping. Split sleeves are way expensive ($2000 +) Haven't found satisfactory solution at reasonable cost (say $300 for clamp/split sleeve). Are there methods of hot tap and thread?
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