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gas line size? and how to determine size.help tim plz
hi,i was on a job today on long island,lady got her oil boiler replaced by a gas boiler by a reputable company of which i wont name.anyway she wants me to run gas lines for a new stove and gas heater in new kitchen.here is my ?.she has a 250 meter bar.of the meter bar is a 3/4 gas line which comes into the house.it feeds a gas heater in the front of the house 16k btu.it then comes to a tee where the boiler tied into it,they increased the size to 1 inch for the boiler70k burnham steam boiler.old gas line then picks up a 50 gallon water heater.there is unions all over the place,it is an old gas line.she now wants to pick up a stove and another 16k heater.boiler company told her pipe was big enough.i need some education on this,i thought once a line was 3/4 it would stay 3/4 even if you increased its size,should an 1.25 inch line been used.also i was always taught to use left to right nipple and coupling when working back and not a union.i appreciate any help.im not to keen on tying into the old line,what do i do?????