Abstract: The present invention provides methods and systems for an upstream pipe plug that includes a first bulkhead, a second bulkhead, a vent pipe engaged to the second bulkhead, and an insertion pipe engaged to the second bulkhead.

Abstract: The present invention provides methods and systems for an upstream pipe plug that includes a first bulkhead, a second bulkhead, a vent pipe engaged to the second bulkhead, and an insertion pipe engaged to the second bulkhead.

Abstract: A commercially feasible method is provided for molding high quality seamless, irregularly shaped articles such as wax candles which are essentially free of surface defects and other molding imperfections by provision of relatively thin-walled, self-sustaining but distensible molds having high heat transfer properties, in conjunction with mold-receiving housing structure including liquid delivery, circulation and removal apparatus for supporting the molds against perceptible distension under the weight of molding material while accelerating solidification of the wax, and for inducing distension of the molds by the technique of removing only a small portion of the cooling liquid without creating significant liquid-free voids in the mold tank. Thus, the method hereof avoids the necessity of complete draining of the mold tank during each molding cycle which in turn speeds the process and renders it more economical.