TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractFlow assurance is a key aspect of offshore, particularly deepwater developments. Tremendous progress during the past two decades in the understanding of the issues and the required technology has enabled the developments be designed and operated with low risk of flow assurance problems. However, the problems have not been eliminated due to system component failures or un-designed for operating conditions. Real time monitoring of the production and transportation system can help significantly reduce the occurrence and impact. The present paper discusses the use of non-intrusive fiber optic technology for this purpose.A series of fiber optic sensors for temperature, pressure, heat flux, strain, and acoustic measurements have been developed, which form the basis of the methods proposed in this paper for detecting the formation of hydrate plugs in pipelines, for determining the amount and location of paraffin deposition, for pig detection, and slug detection.