Is it ok to run sprinklers in a closed loop?

Las Vegas, NV(Zone 9b)

Are there any benefits to, or reasons that I shouldn't run sprinklers in a closed loop?

I have a small L shaped area where I'm planting grass. One leg is about 5'x15' the other is about 12'x4'. About 130 total sq. feet. In order to have what I understand to be proper sprinkler coverage, (the spray from neighboring heads overlapping completely) I'm installing 16 heads. Each head will only spray between four and five feet. I hope to water the entire area from one valve. Is it ok to run a T from the valve and close the loop or should I leave the loop open? I'm hoping I'll have enough pressure for complete coverage. If not I'll have to install a new valve and run new wires. If that is the case, my original question is moot.:(

Thanks in advance, David

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