Forehearth tank assembly for a glass distribution channel. The assembly includes a single liner, two plungers and more and a single flow washer that has first and second orifices. The plungers are arranged, at least in part, in the liner. More than three grooves are created on the inner surface of the liner. Each has, in an inner part of the liner that is intended to be in contact with molten glass, a lower portion extending over more than 10% of the length of the lower part and having a length, measured following the groove, of greater than 0.1 times the length of the lower part. The length of the lower part is measured along the axis of the liner.

A glass manufacturing apparatus includes a conduit in fluid communication with a delivery chamber and an inlet of a forming device. The conduit includes a closed sidewall surrounding a channel extending in a flow direction of the conduit. The glass manufacturing apparatus includes an enclosure surrounding the conduit and extending along a length of the conduit. The enclosure includes a refractory material in contact with the conduit such that an inner surface of the enclosure substantially matches a shape of an outer surface of the sidewall. Methods of manufacturing a glass ribbon are provided.

A glass manufacturing apparatus includes a conduit in fluid communication with a delivery chamber and an inlet of a forming device. The conduit includes a closed sidewall surrounding a channel extending in a flow direction of the conduit. The glass manufacturing apparatus includes an enclosure surrounding the conduit and extending along a length of the conduit. The enclosure includes a refractory material in contact with the conduit such that an inner surface of the enclosure substantially matches a shape of an outer surface of the sidewall. Methods of manufacturing a glass ribbon are provided.