Method for reducing forces (hot fill/re-fill)

A method of designing a container for accommodating solid ammonia storage material where a process temperature for ammonia saturation/resaturation TSAT and a target density of the storage material, DMAT, are fixed, and the outcome of the design method is a container design capable of withstanding a resulting exerted pressure from the material, PMAT, or force FMAT, upon ammonia saturation/resaturation, the method comprising using a known relation between TSAT, DMAT, and PMAT, or FMAT, to establish a value of PMAT, or FMAT, and use this value for the design of the container such that its mechanical strength measured in terms of a hydraulic-limit parameter PLIMIT, or FLIMIT, under which walls of the container do not undergo plastic deformation, or do not undergo deformation of more than 200% of a deformation at a yield point of the container walls, is equal to or exceeds the value of PMAT, or FMAT.

A container filled with a solid ammonia storage material with a storage density, DMAT, capable of desorbing and absorbing/reabsorbing ammonia, said container having a mechanical strength corresponding to a limit-pressure parameter, PLIMIT, or limit-force parameter FLIMIT, at which pressure, or force, inside the container the container does not undergo plastic deformation, or does not undergo deformation of more than 200% of a deformation at a yield point of the container walls, and

• said storage material in the container being filled with ammonia by a saturation/re-saturation process in which the saturation/resaturation of the storage material is performed with the storage material inside the container at a process temperature, TSAT, fulfilling the condition TSAT≧TSATMIN,
• where TSATMIN is a minimum temperature of the saturation/resaturation process where PMAT, or FMAT, exerted by the storage material is kept below the limit for the mechanical strength in terms of PLIMIT, or FLIMIT, of the container.