Dena DiPiazza of Dunlevy died Monday;July 11;1983;at Allegheny General Hospital in Pittsburgh.  She was 62.  Mrs.DiPiazza was born in Dunlevy on March 29;1921;a daughter of the late Sebastiano and Erminia Ferrari Manzini.  She was a member of the Mother of Sorrows Roman Catholic Church in Charleroi.  Survivors include her husband;Joseph;a daughter;Mary Ann at home;three brothers;Pete Manzini of Belle Vernon;Albert Manzini of Speers;and James Manzini of Dunlevy;a sister;Mary Lupori of Dunlevy and several nieces and nephews.  Friends will be received Wednesday from 7 to 9 p.m.and Thursday from 2 to 4 and 7 to 9 p.m.in the Ed Melenyzer Funeral Homes;Inc.;1008 Furlong Ave.;Roscoe.  Blessing Service at the funeral home will be held Friday;July 15;at 9:30 a.m.;followed by Mass of Christian Burial in St.Joseph Catholic Church;Roscoe;with the Rev.Robert A.Kohuch;pastor;as celebrant.  Burial will be in Belle Vernon Cemetery.  Ed Melenyzer Funeral Homes;Inc.;is in charge of arrangements.