A New York man was sentenced today to 18 months in federal prison after a jury convicted him of stealing submarine parts from the Navy and selling them for scrap.Frank E. Spaulding, 37, also known as Khalif Immanuel Bey, confessed to stealing submarine acoustic domes in December 2006 after the parts had been removed from the Hampton, according to the U.S. Attorney’s Office.Spaulding sold the parts, worth $21,000, to a local scrap yard for about $2,000, the U.S. Attorney’s Office said.