Antihydrate

Forty-six case studies of hydrate plug formation and remediation are recorded in Hydrate Engineering (Sloan, 2000). In every case, hydrate plugs were remediated. In addition, a rule of thumb is that most of the offshore flowline shut-ins are less than the 10 h no touch time, which requires no antihydrate operation before restart (J.E. Chitwood, Personal Communication, August 1, 2003). However, hydrate prevention methods are very expensive, as shown in the above Canyon Express and Ormen Lange examples, or in the fact that deepwater insulation costs are typically U.S.Sl million per kilometer of flowline. 

D Antihydral (Robugen) Elmitolo (Bayer) wfm J Hexamine(Mohan ... 

Synonyms. Aminoform Esammina Formine Hexamethylen-amine Hexamethylenetetramine Methenamine Urotropine. Proprietary Names. Antihydral Urotropina. 

Drying cannot be entirely relied on to prevent hydrate formation. Minor quantities of water (even at a level of a few parts per million or less) can accumulate in a column over a period of time, and eventually cause a hydrate problem. Facilities for injecting a suitable antihydrate such as methanol or propanol (which act like antifreeze) must be provided. The author found that appropriate differential pressure recording can provide 2m excellent tool for detecting and diagnosing hydrate problems. 

Mitchell (1991), at Monsanto, prepared methionine N-terminated bovine somatotropin zinc salt (ZnMBS) in an oil gel consisting of sesame oil thickened with 5 % antihydration agent, aluminum monostearate (wt. ratio... 

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