Ammonia : Ammonia Receiver are available in twelve standard sizes for ammonia liquid storage capacity from 100 to 200 kgs. However if required for very large ammonia storage capacity two or three receivers can be installed in parallel. Safety : For safety reason it has become a practice all over the world to use the minimum quantity of ammonia gas charge per ton of refrigeration system. It is necessary to select the ammonia refrigeration equipment, which may be more efficient with minimum charge of ammonia gas.