The gas line coming into my newly redesigned kitchen and supplying a range has to be routed under the sink because there was no room behind the rear left corner to go behind the studs in the wall. The valve on the left, terminating a 1/2" black pipe, is where it enters and the nipple in the back wall is where it exits the sink to travel another approximately 10' to the range, again via 1/2" black pipe.
Of course, because the area under the sink is messy, busy, and complicated, as can be seen in the picture, with other pipe, cable, garbage disposal etc, running black pipe there, with a minimum of two elbows in a tight space would be inconvenient, obstructing and difficult to turn the wrench so I want to use the yellow flex connector. However, I know that flex is usually used between a black pipe terminal and an appliance and what we have here is mid-line.
So I have several questions:
- Is this generally permissible by the US codes (specifically mid Atlantic, relatively strict)?
- Considering that the two ends of black pipe it connects are 1/2", can I use 1/2" flex (which I think is smaller inside diameter than 1/2" black pipe), which I obviously prefer for spacing reasons, or should I go with 3/4", which I think corresponds more in inside diameter with 1/2" black? The final flex connector at the end that connects the range is 1/2". The picture shows a 3/4" that is 36" long, which is too long and I plan to replace it with 24" so I don't need to wrap around the PVC pipe like it shows here, which comes in both 1/2 and 3/4". Does it actually matter and can using a slightly fatter pipe between two smaller cause any adverse effects?
- Someone (whose advice I am not taking unverified) told me that this connector might need to be electrically grounded. I do have an adjacent junction box in a laundry bay to the left of the sink. Should I ground it using a pipe grounding clamp?