Del. Code tit. 10, § 9552

An execution shall not bind goods and chattels until it is delivered to the constable or other officer to be executed. An execution shall, from the time it is so delivered, bind all the goods and chattels of the defendant, within the bailiwick of such constable or other officer which are actually levied upon within 30 days thereafter. No levy upon goods and chattels, made by virtue of execution process, shall be of any force or effect as against a subsequent execution levied upon the same goods and chattels for a longer period than 3 years from the making of such first mentioned levy.