Abstract: A method and apparatus for detecting the presence or absence of an undesirable fluid, such as water, in a pipeline and for removing the undesirable fluid are disclosed. A detecting substance, for example, sugar, naphthalene or a pigmented solid is carried by a sweeping pig. The sweeping pig is inserted into the pipeline, propelled along the pipeline and recovered from the pipeline. The detecting substance is examined upon recovery of the sweeping pig to determine whether the undesirable fluid is present in the pipeline. The pipeline can be swept multiple times until examination of the detecting substance indicates that the undesirable fluid is not present in the pipeline.

Abstract: Disclosed are methods for transporting one or more synthetic products produced from a carbonaceous source, such as coal, natural gas, or biomass, which may be located in a location that is remote from markets for such products. The synthetic products may include lower molecular weight alcohols such as methanol, lower molecular weight ethers such as dimethyl ether, olefins and/or the products of a Fischer-Tropsch or other hydrocarbon synthesis. The methods include transport of such synthetic products via a pipeline in the dense phase state, either neat or blended with light hydrocarbons, such as natural gas.

Abstract: A method and apparatus for detecting the presence or absence of an undesirable fluid, such as water, in a pipeline and for removing the undesirable fluid are disclosed. A detecting substance, for example, sugar, naphthalene or a pigmented solid is carried by a sweeping pig. The sweeping pig is inserted into the pipeline, propelled along the pipeline and recovered from the pipeline. The detecting substance is examined upon recovery of the sweeping pig to determine whether the undesirable fluid is present in the pipeline. The pipeline can be swept multiple times until examination of the detecting substance indicates that the undesirable fluid is not present in the pipeline.