They are used as covering and supporting materials of catalysts in reaction vessels and as packing in towers.
Metallic Ring Series of Tower Packing Feature Parameters
Name
Type
Specification D*H*mm
Heaping Num
Heaping weight kg/m3
Specific surface area m2/m3
Void space
m3/m3
Dry packing factor
Pall ring
Dg16
16×16×0.4
171000
427.5
239
0.928
299
Dg25
25×25×0.6
55900
519.87
219
0.934
269
Dg38
38×38×0.8
13700
394.56
129
0.945
153
Dg50
50×50×1
6300
390.6
112.3
0.949
131
Rectangle saddle ring
Dg25
25×20×0.5
101160
354.06
185
0.96
209.1
Dg38
38×20×0.5
33600
278.88
140.4
0.968
126.1
Dg50
50×28×0.8
10400
237.12
90.4
0.97
84.7
Dg76
76×48×1
3320
205.84
57.6
0.97
63.1
Ladder ring
Dg25
25×12.5×0.6
97160
446.936
220
0.93
273.5
Dg38
38×19×0.8
31890
459.216
154.3
0.94
185.8
Dg50
50*28*0.8
11600
296
109.2
0.95
127.4
Conjugate ring
ø16
23×16×0.4
211231
339
311
0.97
324
ø25
25×25×0.5
75001
300.004
181
0.96
193
ø38
38×38×0.7
19500
280.8
108
0.97
119
ø50
50×50×0.8
9772
278.502
82
0.96
96.8
Inner curved arc jointed plate ring
Dg25
25×9×0.5
160000
448
228
0.936
324
Dg38
38×12.7×0.7
48000
403.2
150
0.95
Dg50
50×17×0.8
21500
365.5
115
0.965
Dg75
75×22.5×1
5800
243.6
88
0.975
Improved pall ring
Dg/p>
25×25×0.5
55700
430.43
174
0.961
Dg38
38×38×0.6
13700
295.92
101
0.964
Dg50
50×50×0.8
6300
313.74
68
0.97
Dg76
76×76×1
1927
277.102
45
0.97
Improved inner arc ring
Dg38
38×38×0.6
14500
313.2
138
0.947
164
Dg50
50×50×0.8
7000
348.6
121
0.95
144
Rasching
ring
15
15*15*0.5
248000
793.6
350
0.92
460
25
25*25*0.8
55000
687.3
220
0.92
290
38
38*38*1.0
13700
493.2
150
0.93
190
50
50*50*1.6
6300
630
110
0.95
130
76
76*76*1.6
1927
443.21
68
0.95
80
