Hiram in 1851 :
1851 census :
HO107/2367, Folio 203, Page 28
Yorkshire, Bridlington
Chestnut Cottages
Hiram Porterfield, head, wdr, 50, Boatman Coast Guard, b. Durham, Spittal   
Jane, dau, unm, 18, Dress Maker, b.Sussex, Hastings    
Grace, dau, 13, Scholar. b. Sussex, Hastings    
Charles, son, 11, Scholar, b. Sussex, Hastings 
In all the later census returns they were living in Scarborough.
Also, the one and only time I can see the name Portfield written was on the marriage registration.
Pels.