pipe still

pipe still

[′pīp ‚stil]
(chemical engineering)
A petroleum-refinery still in which heat is applied to the oil while it is being pumped through a coil or pipe arranged in a firebox, the oil then running to a fractionator with continuous removal of overhead vapor and liquid bottoms.
References in periodicals archive ?
These were used across the world until 1936 when engineers from Scottish Oils designed a new system based on pipe stills.