Page 19 - Schroeder - Hydraulic And Lube Filtration

Dirt holding capacity (DHC) is the amount of Dirt Holding
contaminant (expressed in grams) the element Table 5. Typical Dirt Holding Capacities for Capacity
will retain before it goes into bypass. All other Z-Media Elements
®
factors being equal, an element’s DHC generally Element Medium
indicates how long the element will operate Size Z1 Z3 Z5 Z10 Z25
until it needs to be replaced. The element’s life 3TA 9 7 10 8 8
span is directly related to the cost of operating
the filter. 3TB 27 11 12 11 11
5TB 40 18 21 17 18
Dirt holding capacity, sometimes referred to as KB 110 99 138 110 112
"retained capacity," is a very important and KI 85 88 130 104 106
often overlooked factor in selecting the right KKI 181 185 263 174 214
element for the appli cation. The dirt holding
capacity of an element is measured in grams of 27KI 336 345 357 324 279
ISO medium test dust contaminant as determined 16Q 258 283 254 280 234
from the multi-pass test (ISO 16889). When 39Q 593 1001 691 940 537
selecting filter elements, it is beneficial to 39QCLQF 1259 1293 869 1214 1102
compare the dirt holding capacities of elements 39QPML 1485 1525 1235 1432 1299
with similar particle removal efficiencies. BBI 306 341 272
KG 112 115 119 108 93
KKG 224 230 238 216 186
27KG 336 345 357 247 279
4Y 6 5 6 5 5
8Y 12 10 12 11 9
8R 33 26 51 29 30
K 112 115 119 108 93
KK 224 230 238 216 186
27K 336 345 357 324 279
FZX 6 5 7 5 5
SVZX 27 21 30 24 24
5CT 27 22 31 24 25
8CT 44 35 49 39 40
14CT 94 75 105 84 85
5CTZ 19 16 18 21 17
8CTZ 31 27 34 28 24
14CTZ 66 57 64 72 60S
6G 38 30 42 34 34
9G 64 51 71 57 58
5H 26 28 39 47 48
9H 51 42 59 42 48
13HZ N/A 100 113 119 123
16QCLQF 307 315 364 306 278
16QPML 307 315 364 330 299
25DN N/A 57 62 52 48
40DN N/A 105S 115 104 94

When sizing a filter, it is important to consider the initial differential pressure (ΔP) across the element and Pressure Drop
the housing. Elements offering a lower pressure drop at a high Beta efficiency are better than elements
with a high ΔP at the same efficiency. At every level of filtration, Schroeder’s Excellement Z-Media ®
®
elements offer the best combination of high efficiency, high stability, high dirt holding capacity, and low
pressure drop. The pressure drop of an element is determined by testing according to ISO 3968.

The collapse (crush) rating of a filter (determined by ISO 2941/ANSI B93.25) represents the differential Collapse Rating
pressure across the element that causes it to collapse. The collapse rating of a filter element installed in
a filter housing, with a bypass valve, should be at least two times greater than the full flow bypass valve
pressure drop. The collapse rating for filter elements used in filter housings with no bypass valve should
be at least the same as the setting of the system relief valve upstream of the high-crush element. When
a high collapse element becomes clogged with contamination all functions downstream of the filter will
become inoperative.

SCHROEDER INDUSTRIES 17