Support grid provide the most efficient means to introduce gas to the bottom of the packed bed and reduce initial pressure drop & vessel height requirement.It is not only used in support packing or liquid attached packing’s weight,but ensure that upward gas will pass through smoothly. Therefore, enough strength & rigidity is very important. Of course, when free cross-sectional area is less than 50% of tower area, it is very easy to cause flooding phenomena. Support Grid is shaped and designed to provide maximum open area such that there is minimum resistance to gas flow. Therefore,enough support strength & Large throughput is very important. In addition, column diameter,design load,packing type,liquid hold up,system corrosivity and so on also influnce support grid's design.

All support grid rest directly on a support ring since the weight of the packing is sufficient to keep the support plate in place. If required however, they can be clamped to the ring.