Step Ring learned the advantages of short Raschig ring and ring for the improvement Powell, ring height to diameter ratio of 1:2 and taper rolled edge is added to one end. Reduces the resistance of the gas through the bed, and increased throughput, high-strength filler, due to its structural characteristics, so that gas and liquid distribution, increasing the gas-liquid contact area and improve the mass transfer efficiency. 
 Application: ammonia desulfurization, decarburization system, separation of crude oil distillation unit of separation, for example: methanol separation, separation of organic acid absorption and desorption tower. 

 Name 
 Specification 
 d × h × δ 
 mm 
 Surface area 
 α 
 m2/m3 
 Void 
 ε 
 % 
 Number of accumulation 
 η 
 n/m3 
 Dry packing factor 
 α/ε3 
 m-1 


 Metal ladder ring 
 25 × 25 × 0.5 220 0.93 97160 273.5 
 38 × 19 × 0.6 154.3 0.94 31890 185.8 
 50 × 25 × 0.8 109.2 0.95 12600 127.4 
 76 × 38 × 1.0 90 0.925 3420 112.4