Screen Guide

Screen Guide
SST-0607
Figure 4:
STYLE 'B'
Slanted Type Basket
Typically used for larger
sized Simplex and Duplex
Basket Strainers. Slanted
inlet side reduces pressure
drop across the strainer.
Strainer cover presses
down on handle to ensure
straining element remains
securely seated.
One of the most important design considerations when
purchasing a strainer is specifying the perforation or mesh size
of the straining element. The straining element (commonly
referred to as a screen for WYE strainers and a basket for
basket strainers) is a mechanical filter which removes and retains
particles too large to pass through yet allows the flowing media
(liquid or gas) to pass unobstructed. This process is illustrated
in Figure 1. By cleaning the flowing media, the straining element
helps to protect expensive downstream equipment such as
pumps, meters, spray nozzles, compressors, and turbines.
10K
1” Perf (25,400 µm)
½” Perf (12,700 µm)
1/4” Perf (6350 µm)
1/8” Perf (3175 µm)
1K
1/16” Perf (1587 µm)
20 Mesh (914 µm)
1/32”Perf (838 µm)
10
40 Mesh (381 µm)
100 Mesh (139 µm)
0.1
Figure 6:
STYLE 'D'
Temporary Conical
Often referred to as
a cone or witch's hat
strainer. Used during
start-up operations.
DIAMETER
DIAMETER
LENGTH
DIAMETER
LENGTH
PERF
LENGTH
Figure 5:
STYLE 'C'
Basket Type
Typically used for smaller
sized Simplex and
Duplex Basket Strainers.
Strainer cover presses
down on handle to
ensure straining element
remains securely seated.
DIAMETER
Figure 7:
STYLE 'E'
Temporary Conical
Often referred to as a
basket or pilgrim's hat
strainer. Used during
start-up operations.
A Titan FCI stainer should always be installed ahead of pumps
and other expensive, downstream equipment to help ensure
proper protection and trouble-free operation. This even holds
true for "clean lines" to protect against scale and accidentally
introduced items such as: tools, gaskets, nuts, or bolts.
Magnetic screen assemblies are recommended for applications that require the removal and retention of microscopic ferrous
particles. Virtually any Titan FCI strainer can be fitted with powerful ALNICO magnetic inserts to provide protection against both
magnetic and non-magnetic particles. These magnetic inserts create a continuous magnetic field within the interior of the straining
element trapping ferrous particles even the finest mesh would typical not remove. Magnetic screen assemblies can effectively be
employed in lubrication systems, hydraulic systems, and machine coolant systems.
Pleated (Convoluted) Straining Elements:
Particle retention is directly related to the amount of surface area available on the straining element. As straining occurs, the gradual
retention of particles can cause a layered build-up on the surface of the straining element. With cylindrical straining elements, this
accumulation pattern can quickly clog the outlet side of the strainer causing a significant increase in pressure drop. This is illustrated
in Figure 8. To solve this problem, Titan FCI can fabricate pleated straining elements which expand the straining surface area and
disperse the particles in a uniform manner. This alleviates the layered build-up and typical loss in pressure drop. This is illustrated in
Figure 9.
Figure 1: Straining Illustration
Determining Opening Size:
In general, screen openings should be approximately one-half the
diameter of the largest allowable particle. The largest allowable
particle is defined as the size of particle that can pass through
downstream equipment without causing damage. For example,
if the maximum allowable particle is 1/16 inch than the screen
opening would be specified at 1/32 inch. In addition to the size
of particles, the quantity of debris in the flowing media must also
be considered when determining the appropriate opening size.
Straining elements can only be used to remove insoluble floating
impurities. The most common range of particle retention is
1 inch down to 40 microns (.0015 inch). See Figure 2 for a
comparison of sizes for a variety of common particles.
Figure 8: Top View - Basket Strainer - Cylindrical Straining Element
Figure 9: Top View - Basket Strainer - Pleated Straining Element
290 Corporate Drive
PO Box 7408
Lumberton, NC 28358
Maintenance costs are significantly increased due to excessive cleaning requirements.
Pressure drop is increased dramatically.
The straining element may become damaged and fail.
Straining elements are not designed to withstand the same
pressure as the strainer housing. If the straining element
becomes fully clogged, it will be exposed to the same pressure
as the housing. In most cases, this will cause the straining
element to fail. For these types of applications,Titan FCI offers
special drilled or wedge wire screens that can withstand full
line pressure when clogged. A convenient way to monitor the
differential pressure is to install pressure gauges on both the
inlet and outlet sides of the strainer. It is not recommended
to allow the differential pressure to exceed 20 psi.
Magnetic Screen Assembly:
Titan FCI can also fabricate straining elements that will withstand full line pressure when clogged. These straining elements have
individually drilled holes in heavy gauge metal (up to 3/8" thick) or utilize wedge wire.
Determining Opening Size: continued...
•
•
•
Titan Flow Control - Special Screen and Basket Designs
Special Drilled or Wedge Wire Screens:
Figure 2: Particle Size Comparison Chart
A common mistake is to specify a screen opening that is to small
for the application. This can lead to overstraining and should be
avoided for the following reasons:
DIAMETER
DIAMETER
0.001
Colloidal Solids/Virus/Proteins
Some Corrosion Products
ER
Micro Organisms/Bacteria
Oil Emulsion/Clay Algae
ET
Sand/Silt/Flocs
Clay/Pollen Algae
∞
Introduction:
AM
PERF
LENGTH
LENGTH
SCREEN AND BASKET SELECTION GUIDE
Choosing the right straining element
DIAMETER
DIAMETER
LENGTH
DI
TITAN
Small Aquatic Life and Debris
Gravel/Crustacea/Twigs
Figure 3:
STYLE 'A'
Cylindrical Screen
Generally used for "Y"
Type Strainers.
DIAMETER
Please send us your prints, samples, or
simply give us your requirements and
let us design a straining element for
you. In most cases, straining elements
can be ordered by referencing Titan
FCI's or any other manufacturers'
strainer model number.
5. Design Type (cone, basket etc.)
6. Flow Direction
7. Open Area % and Length
8. Pressure Ratio
PERF
LENGTH
When ordering, please specify:
1. Pipe Size
2. Straining Element Type
3. Perforation or Mesh
4. Construction Material
LENGTH
Titan FCI can manufacture straining
elements for all types of strainers
including "Y", "T", and basket in a
wide variety of materials. We can
also manufacture conical/temporary
strainers.
Large Aquatic Life
Large Debris/Branches
Titan Flow Control - Standard Screen and Basket Designs
Microns (µm)
4
In some applications requiring finer filtrations, it may be advisable
to strain in gradual steps. This is accomplished by placing
progressively smaller straining elements in series. As always,
a Titan FCI engineer is available to assist you in developing a
solution for any special straining requirements you may have.
Construction Material:
Irregardless of the strainer housing material being used, the
most common construction material used for straining elements
is stainless steel. This is due to the inherent resistance to
corrosion stainless steel provides. As such, Titan FCI's standard
construction material for all straining elements is Type 304
stainless steel. Other materials (316 SS, 316L, and Monel) are
available upon application. Please consult a Titan FCI engineer
for determining the best material for your application.
Titan Flow Control, Inc.
www.titanfci.com
Tel: 910-735-0000
Fax: 910-738-3848
[email protected]
2
Titan Flow Control - Perforation and Mesh Configurations
Titan Flow Control - Screen and Basket Types
Table 2: Standard Mesh and Perforated Configurations (1)(2)
Screen Types:
In general, strainer elements are available in three types: perforated, wire mesh, and reinforced wire mesh lined.
Perforated:
Titan FCI offers a wide range of perforation sizes. To make the selection process easier,Titan FCI recommends
a standard perforation size suitable for general service for each type of strainer. The standard perforation
size has been determined to provide the best balance of open area ratio (OAR), hole arrangement, and gauge
thickness that results in the least amount of pressure drop. Please refer to each strainer's specification
sheet for standard perforation size recommendations. Additionally, Table 4 presents a general guide for
selecting straining element sizes for water, steam, oil, gasoline and air.
Where permissible,Titan FCI uses a 60° staggered round hole arrangement because of its superior strength
and large open area ratio (OAR). On smaller perforation sizes, Titan FCI uses a straight line, round hole
pattern that allows for a large OAR yet does not compromise gauge thickness. In general, as the hole
diameter becomes smaller and the OAR increases, the gauge thickness inherently becomes thinner.
20 Mesh
51.8% Open Area
.036 Openings
(.914 mm / 914 µm)
.014 Wire Diameter
60° Staggered Round
Hole Arrangement
30 Mesh
44.8% Open Area
.0223 Openings
(.566 mm / 566 µm)
Wire Size Diameters and
Washburn & Moen
Gauge Equivalents
Inch
Gauge
.120
11 Ga.
.105
12 Ga.
.092
13 Ga.
.080
14 Ga.
.072
15 Ga.
.063
16 Ga.
.054
17 Ga.
.047
18 Ga.
.041
19 Ga.
.035
20 Ga.
.032
21 Ga.
Wire Mesh:
For finer straining applications, down to 40 micron, wire mesh straining elements are available. Titan
FCI utilizes a mono-filament, plain square weave that exhibits large OAR and very low flow resistance.
Other types of weaves, such as plain Dutch and Twilled Dutch weave, are also available upon request.
As with perforated straining elements, Titan FCI has developed standard mesh sizes suitable for
general service for each type of strainer. Unsupported wire mesh straining elements are only suitable
for strainers under 2 inches in size, constructed of 20 or 30 mesh, and operating within low pressure
applications (under 200 psi). For larger strainers, finer mesh sizes, and higher pressure applications
reinforced mesh lined screens must be used.
Wire Mesh Lined:
In most cases, wire mesh straining elements are reinforced with a heavier
gauge, perforated metal backing to provide additional support. Titan FCI's
standard perforated metal backing is 5/32 inch which provides excellent
support without significantly diminishing the OAR.
Air or Gas
Gasoline
Oil - Low Viscosity
Oil - Medium Viscosity
Oil - High Viscosity
Steam
Water
1/2" ~ 2"
2 1/2" ~ 4"
5" and up
1/2" ~ 2"
2 1/2" ~ 6"
8" and up
1/2" ~ 2"
2 1/2" ~ 6"
8" and up
1/2" ~ 2"
2 1/2" ~ 6"
8" and up
1/2" ~ 2"
2 1/2" ~ 6"
8" and up
1/2" ~ 2"
2 1/2" ~ 4"
5" and up
1/2" ~ 2"
2 1/2" ~ 4"
5" and up
1/32" perf.
1/16" perf.
1/8" perf.
1/32" perf.
1/16" perf.
1/10" perf.
1/16" perf.
3/16" perf.
3/8" perf.
1/10" perf.
1/4" perf.
3/8" perf.
1/8" perf.
3/8" perf.
1/2" perf.
1/32" perf.
3/64" perf.
1/16" perf.
1/32" perf.
1/8" perf.
1/4" perf.
40 Mesh
36% Open Area
.015 Openings
(.381 mm / 381 µm)
.010 Wire Diameter
60 Mesh
33.9% Open Area
.0097 Openings
(.246 mm / 246 µm)
.007 Wire Diameter
Fine Straining
60 mesh
3/64" perf.
1/10" perf.
30 mesh
1/32" perf.
1/32" perf.
1/32" perf.
1/8" perf.
1/4" perf.
1/16" perf.
3/16" perf.
1/4" perf.
1/10 perf.
1/4" perf.
3/8" perf.
30 mesh
1/32" perf.
3/64" perf.
20 mesh
1/16" perf.
1/8" perf.
(.033 in / 0.83 mm)
.055 Centers
28% Open Area
330 holes/sq. in.
Straight Line
3/64" Diameter
(.045 in / 1.14 mm)
.066 Centers
36% Open Area
225 holes/sq. in.
Straight Line
1/16" Diameter
(.0625 in / 1.58 mm)
3/32" Centers
41% Open Area
132 holes/sq. in.
Staggered Line
Table 3: Optional Mesh Configurations (3)
Wire
Open
Hole Openings
Mesh
Dia.
Area
(Linear inch)
(in)
(µm)
(in)
(%)
20
20
30
30
40
40
50
60
60
80
80
100
100
120
130
140
150
160
170
180
200
325
400
500
.016
.023
.010
.014
.009
.011
.009
.0065
.0080
.0055
.0060
.0040
.0045
.0037
.0034
.0029
.0026
.0025
.0024
.0023
.0021
.0011
.0010
.0010
.034
.027
.0233
.0193
.016
.014
.011
.0102
.0087
.0070
.0065
.0060
.0055
.0046
.0043
.0042
.0041
.0038
.0035
.0033
.0029
.0020
.0015
.0010
863
685
591
490
406
355
279
259
221
177
165
152
139
116
109
106
104
96
88
83
73
50
38
25
46.2
29.2
48.9
33.5
41.0
31.4
30.3
37.5
27.2
31.4
27.0
36.0
30.3
30.7
31.1
34.9
37.4
36.4
35.1
34.7
33.6
42.0
36.0
25.0
Table 4: Optional Perf. Configurations (3)
Wire Mesh with
Perforated Backing
Table 1: Straining Element Selection Guidelines: (1)
Pipeline Media
Strainer Size
Coarse Straining
.011 Wire Diameter
1/32" Diameter
3
100 mesh
60 mesh
40 mesh
100 mesh
60 mesh
40 mesh
30 mesh
1/16" perf.
1/8" perf.
20 mesh
1/8" perf.
3/16" perf.
1/16" perf.
3/16" perf.
1/4" perf.
60 mesh
30 mesh
1/32" perf.
30 mesh
3/64" perf.
3/64" perf.
1. Represents a general guide for the selection of strainer element sizes. Should not be taken as an absolute guide as each particular application introduces its own set of unique requirements. When in doubt, please contact a Titan FCI engineer.
80 Mesh
36% Open Area
.0075 Openings
(.190 mm / 190 µm)
.005 Wire Diameter
100 Mesh
30.3% Open Area
.0055 Openings
(.139 mm / 139 µm)
.0045 Wire Diameter
1/8" Diameter
(.125 in / 3.17 mm)
3/16" Centers
40% Open Area
33 holes/sq. in.
Staggered Line
5/32" Diameter
(.1563 in / 3.96 mm)
3/16" Centers
63% Open Area
33 holes/sq. in.
Staggered Line
1/4" Diameter
(.25 in / 6.35 mm)
5/16" Centers
58% Open Area
12 holes/sq. in.
Staggered Line
Hole
Diameter (in)
Centers (in)
Open Area
(%)
.027
.045
.045
1/16
1/16
5/64
5/64
3/32
3/32
3/32
.100
.117
1/8
1/8
9/64
5/32
3/16
3/16
3/16
7/32
1/4
1/4
1/4
5/16
3/8
3/8
7/16
1/2
1/2
.05 Straight
.066 Straight
.088 Staggered
7/64 Staggered
1/8 Staggered
7/64 Staggered
1/8 Staggered
5/32 Staggered
3/16 Staggered
1/4 Straight
5/32 Staggered
5/32 Staggered
7/32 Staggered
1/4 Staggered
3/16 Staggered
1/4 Staggered
1/4 Staggered
5/16 Staggered
1/2 Straight
5/16 Staggered
3/8 Staggered
1/2 Staggered
1/2 Straight
7/16 Staggered
1/2 Staggered
9/16 Staggered
5/8 Staggered
11/16 Staggered
3/4 Staggered
23.0
36.0
24.0
30.0
22.5
46
36
33.0
25.0
12.7
36.0
51.0
30.0
23.0
51.0
34.0
50.0
33.0
10.0
45.0
40.0
23.0
20.0
46.0
52.0
40.0
45.0
48.0
40.0
Notes:
1. Titan FCI's standard construction material for all screens and baskets is Type 304 Stainless Steel.
Other materials (i.e. Type 316 and Monel) are available upon request. Please consult factory for pricing and availability for non-stock materials.
2. Table 2 represents Titan FCI's most commonly stocked mesh and perforation arrangements. A large variety of special mesh and perforation options are available. Please consult the factory or your local sales representative regarding the specific requirements of your application.
3. Table 3 & 4 represent optional mesh and perf configurations which are not routinely stocked but can be furnished upon request. Please consult factory for pricing and availability.
4. For mesh lined screens or baskets, 5/32" perf is most commonly used for outer support (backing). If other backing is required, please specify at time of order.
2
Titan Flow Control - Perforation and Mesh Configurations
Titan Flow Control - Screen and Basket Types
Table 2: Standard Mesh and Perforated Configurations (1)(2)
Screen Types:
In general, strainer elements are available in three types: perforated, wire mesh, and reinforced wire mesh lined.
Perforated:
Titan FCI offers a wide range of perforation sizes. To make the selection process easier,Titan FCI recommends
a standard perforation size suitable for general service for each type of strainer. The standard perforation
size has been determined to provide the best balance of open area ratio (OAR), hole arrangement, and gauge
thickness that results in the least amount of pressure drop. Please refer to each strainer's specification
sheet for standard perforation size recommendations. Additionally, Table 4 presents a general guide for
selecting straining element sizes for water, steam, oil, gasoline and air.
Where permissible,Titan FCI uses a 60° staggered round hole arrangement because of its superior strength
and large open area ratio (OAR). On smaller perforation sizes, Titan FCI uses a straight line, round hole
pattern that allows for a large OAR yet does not compromise gauge thickness. In general, as the hole
diameter becomes smaller and the OAR increases, the gauge thickness inherently becomes thinner.
20 Mesh
51.8% Open Area
.036 Openings
(.914 mm / 914 µm)
.014 Wire Diameter
60° Staggered Round
Hole Arrangement
30 Mesh
44.8% Open Area
.0223 Openings
(.566 mm / 566 µm)
Wire Size Diameters and
Washburn & Moen
Gauge Equivalents
Inch
Gauge
.120
11 Ga.
.105
12 Ga.
.092
13 Ga.
.080
14 Ga.
.072
15 Ga.
.063
16 Ga.
.054
17 Ga.
.047
18 Ga.
.041
19 Ga.
.035
20 Ga.
.032
21 Ga.
Wire Mesh:
For finer straining applications, down to 40 micron, wire mesh straining elements are available. Titan
FCI utilizes a mono-filament, plain square weave that exhibits large OAR and very low flow resistance.
Other types of weaves, such as plain Dutch and Twilled Dutch weave, are also available upon request.
As with perforated straining elements, Titan FCI has developed standard mesh sizes suitable for
general service for each type of strainer. Unsupported wire mesh straining elements are only suitable
for strainers under 2 inches in size, constructed of 20 or 30 mesh, and operating within low pressure
applications (under 200 psi). For larger strainers, finer mesh sizes, and higher pressure applications
reinforced mesh lined screens must be used.
Wire Mesh Lined:
In most cases, wire mesh straining elements are reinforced with a heavier
gauge, perforated metal backing to provide additional support. Titan FCI's
standard perforated metal backing is 5/32 inch which provides excellent
support without significantly diminishing the OAR.
Air or Gas
Gasoline
Oil - Low Viscosity
Oil - Medium Viscosity
Oil - High Viscosity
Steam
Water
1/2" ~ 2"
2 1/2" ~ 4"
5" and up
1/2" ~ 2"
2 1/2" ~ 6"
8" and up
1/2" ~ 2"
2 1/2" ~ 6"
8" and up
1/2" ~ 2"
2 1/2" ~ 6"
8" and up
1/2" ~ 2"
2 1/2" ~ 6"
8" and up
1/2" ~ 2"
2 1/2" ~ 4"
5" and up
1/2" ~ 2"
2 1/2" ~ 4"
5" and up
1/32" perf.
1/16" perf.
1/8" perf.
1/32" perf.
1/16" perf.
1/10" perf.
1/16" perf.
3/16" perf.
3/8" perf.
1/10" perf.
1/4" perf.
3/8" perf.
1/8" perf.
3/8" perf.
1/2" perf.
1/32" perf.
3/64" perf.
1/16" perf.
1/32" perf.
1/8" perf.
1/4" perf.
40 Mesh
36% Open Area
.015 Openings
(.381 mm / 381 µm)
.010 Wire Diameter
60 Mesh
33.9% Open Area
.0097 Openings
(.246 mm / 246 µm)
.007 Wire Diameter
Fine Straining
60 mesh
3/64" perf.
1/10" perf.
30 mesh
1/32" perf.
1/32" perf.
1/32" perf.
1/8" perf.
1/4" perf.
1/16" perf.
3/16" perf.
1/4" perf.
1/10 perf.
1/4" perf.
3/8" perf.
30 mesh
1/32" perf.
3/64" perf.
20 mesh
1/16" perf.
1/8" perf.
(.033 in / 0.83 mm)
.055 Centers
28% Open Area
330 holes/sq. in.
Straight Line
3/64" Diameter
(.045 in / 1.14 mm)
.066 Centers
36% Open Area
225 holes/sq. in.
Straight Line
1/16" Diameter
(.0625 in / 1.58 mm)
3/32" Centers
41% Open Area
132 holes/sq. in.
Staggered Line
Table 3: Optional Mesh Configurations (3)
Wire
Open
Hole Openings
Mesh
Dia.
Area
(Linear inch)
(in)
(µm)
(in)
(%)
20
20
30
30
40
40
50
60
60
80
80
100
100
120
130
140
150
160
170
180
200
325
400
500
.016
.023
.010
.014
.009
.011
.009
.0065
.0080
.0055
.0060
.0040
.0045
.0037
.0034
.0029
.0026
.0025
.0024
.0023
.0021
.0011
.0010
.0010
.034
.027
.0233
.0193
.016
.014
.011
.0102
.0087
.0070
.0065
.0060
.0055
.0046
.0043
.0042
.0041
.0038
.0035
.0033
.0029
.0020
.0015
.0010
863
685
591
490
406
355
279
259
221
177
165
152
139
116
109
106
104
96
88
83
73
50
38
25
46.2
29.2
48.9
33.5
41.0
31.4
30.3
37.5
27.2
31.4
27.0
36.0
30.3
30.7
31.1
34.9
37.4
36.4
35.1
34.7
33.6
42.0
36.0
25.0
Table 4: Optional Perf. Configurations (3)
Wire Mesh with
Perforated Backing
Table 1: Straining Element Selection Guidelines: (1)
Pipeline Media
Strainer Size
Coarse Straining
.011 Wire Diameter
1/32" Diameter
3
100 mesh
60 mesh
40 mesh
100 mesh
60 mesh
40 mesh
30 mesh
1/16" perf.
1/8" perf.
20 mesh
1/8" perf.
3/16" perf.
1/16" perf.
3/16" perf.
1/4" perf.
60 mesh
30 mesh
1/32" perf.
30 mesh
3/64" perf.
3/64" perf.
1. Represents a general guide for the selection of strainer element sizes. Should not be taken as an absolute guide as each particular application introduces its own set of unique requirements. When in doubt, please contact a Titan FCI engineer.
80 Mesh
36% Open Area
.0075 Openings
(.190 mm / 190 µm)
.005 Wire Diameter
100 Mesh
30.3% Open Area
.0055 Openings
(.139 mm / 139 µm)
.0045 Wire Diameter
1/8" Diameter
(.125 in / 3.17 mm)
3/16" Centers
40% Open Area
33 holes/sq. in.
Staggered Line
5/32" Diameter
(.1563 in / 3.96 mm)
3/16" Centers
63% Open Area
33 holes/sq. in.
Staggered Line
1/4" Diameter
(.25 in / 6.35 mm)
5/16" Centers
58% Open Area
12 holes/sq. in.
Staggered Line
Hole
Diameter (in)
Centers (in)
Open Area
(%)
.027
.045
.045
1/16
1/16
5/64
5/64
3/32
3/32
3/32
.100
.117
1/8
1/8
9/64
5/32
3/16
3/16
3/16
7/32
1/4
1/4
1/4
5/16
3/8
3/8
7/16
1/2
1/2
.05 Straight
.066 Straight
.088 Staggered
7/64 Staggered
1/8 Staggered
7/64 Staggered
1/8 Staggered
5/32 Staggered
3/16 Staggered
1/4 Straight
5/32 Staggered
5/32 Staggered
7/32 Staggered
1/4 Staggered
3/16 Staggered
1/4 Staggered
1/4 Staggered
5/16 Staggered
1/2 Straight
5/16 Staggered
3/8 Staggered
1/2 Staggered
1/2 Straight
7/16 Staggered
1/2 Staggered
9/16 Staggered
5/8 Staggered
11/16 Staggered
3/4 Staggered
23.0
36.0
24.0
30.0
22.5
46
36
33.0
25.0
12.7
36.0
51.0
30.0
23.0
51.0
34.0
50.0
33.0
10.0
45.0
40.0
23.0
20.0
46.0
52.0
40.0
45.0
48.0
40.0
Notes:
1. Titan FCI's standard construction material for all screens and baskets is Type 304 Stainless Steel.
Other materials (i.e. Type 316 and Monel) are available upon request. Please consult factory for pricing and availability for non-stock materials.
2. Table 2 represents Titan FCI's most commonly stocked mesh and perforation arrangements. A large variety of special mesh and perforation options are available. Please consult the factory or your local sales representative regarding the specific requirements of your application.
3. Table 3 & 4 represent optional mesh and perf configurations which are not routinely stocked but can be furnished upon request. Please consult factory for pricing and availability.
4. For mesh lined screens or baskets, 5/32" perf is most commonly used for outer support (backing). If other backing is required, please specify at time of order.
SST-0607
Figure 4:
STYLE 'B'
Slanted Type Basket
Typically used for larger
sized Simplex and Duplex
Basket Strainers. Slanted
inlet side reduces pressure
drop across the strainer.
Strainer cover presses
down on handle to ensure
straining element remains
securely seated.
One of the most important design considerations when
purchasing a strainer is specifying the perforation or mesh size
of the straining element. The straining element (commonly
referred to as a screen for WYE strainers and a basket for
basket strainers) is a mechanical filter which removes and retains
particles too large to pass through yet allows the flowing media
(liquid or gas) to pass unobstructed. This process is illustrated
in Figure 1. By cleaning the flowing media, the straining element
helps to protect expensive downstream equipment such as
pumps, meters, spray nozzles, compressors, and turbines.
10K
1” Perf (25,400 µm)
½” Perf (12,700 µm)
1/4” Perf (6350 µm)
1/8” Perf (3175 µm)
1K
1/16” Perf (1587 µm)
20 Mesh (914 µm)
1/32”Perf (838 µm)
10
40 Mesh (381 µm)
100 Mesh (139 µm)
0.1
Figure 6:
STYLE 'D'
Temporary Conical
Often referred to as
a cone or witch's hat
strainer. Used during
start-up operations.
DIAMETER
DIAMETER
LENGTH
DIAMETER
LENGTH
PERF
LENGTH
Figure 5:
STYLE 'C'
Basket Type
Typically used for smaller
sized Simplex and
Duplex Basket Strainers.
Strainer cover presses
down on handle to
ensure straining element
remains securely seated.
DIAMETER
Figure 7:
STYLE 'E'
Temporary Conical
Often referred to as a
basket or pilgrim's hat
strainer. Used during
start-up operations.
A Titan FCI stainer should always be installed ahead of pumps
and other expensive, downstream equipment to help ensure
proper protection and trouble-free operation. This even holds
true for "clean lines" to protect against scale and accidentally
introduced items such as: tools, gaskets, nuts, or bolts.
Magnetic screen assemblies are recommended for applications that require the removal and retention of microscopic ferrous
particles. Virtually any Titan FCI strainer can be fitted with powerful ALNICO magnetic inserts to provide protection against both
magnetic and non-magnetic particles. These magnetic inserts create a continuous magnetic field within the interior of the straining
element trapping ferrous particles even the finest mesh would typical not remove. Magnetic screen assemblies can effectively be
employed in lubrication systems, hydraulic systems, and machine coolant systems.
Pleated (Convoluted) Straining Elements:
Particle retention is directly related to the amount of surface area available on the straining element. As straining occurs, the gradual
retention of particles can cause a layered build-up on the surface of the straining element. With cylindrical straining elements, this
accumulation pattern can quickly clog the outlet side of the strainer causing a significant increase in pressure drop. This is illustrated
in Figure 8. To solve this problem, Titan FCI can fabricate pleated straining elements which expand the straining surface area and
disperse the particles in a uniform manner. This alleviates the layered build-up and typical loss in pressure drop. This is illustrated in
Figure 9.
Figure 1: Straining Illustration
Determining Opening Size:
In general, screen openings should be approximately one-half the
diameter of the largest allowable particle. The largest allowable
particle is defined as the size of particle that can pass through
downstream equipment without causing damage. For example,
if the maximum allowable particle is 1/16 inch than the screen
opening would be specified at 1/32 inch. In addition to the size
of particles, the quantity of debris in the flowing media must also
be considered when determining the appropriate opening size.
Straining elements can only be used to remove insoluble floating
impurities. The most common range of particle retention is
1 inch down to 40 microns (.0015 inch). See Figure 2 for a
comparison of sizes for a variety of common particles.
Figure 8: Top View - Basket Strainer - Cylindrical Straining Element
Figure 9: Top View - Basket Strainer - Pleated Straining Element
290 Corporate Drive
PO Box 7408
Lumberton, NC 28358
Maintenance costs are significantly increased due to excessive cleaning requirements.
Pressure drop is increased dramatically.
The straining element may become damaged and fail.
Straining elements are not designed to withstand the same
pressure as the strainer housing. If the straining element
becomes fully clogged, it will be exposed to the same pressure
as the housing. In most cases, this will cause the straining
element to fail. For these types of applications,Titan FCI offers
special drilled or wedge wire screens that can withstand full
line pressure when clogged. A convenient way to monitor the
differential pressure is to install pressure gauges on both the
inlet and outlet sides of the strainer. It is not recommended
to allow the differential pressure to exceed 20 psi.
Magnetic Screen Assembly:
Titan FCI can also fabricate straining elements that will withstand full line pressure when clogged. These straining elements have
individually drilled holes in heavy gauge metal (up to 3/8" thick) or utilize wedge wire.
Determining Opening Size: continued...
•
•
•
Titan Flow Control - Special Screen and Basket Designs
Special Drilled or Wedge Wire Screens:
Figure 2: Particle Size Comparison Chart
A common mistake is to specify a screen opening that is to small
for the application. This can lead to overstraining and should be
avoided for the following reasons:
DIAMETER
DIAMETER
0.001
Colloidal Solids/Virus/Proteins
Some Corrosion Products
ER
Micro Organisms/Bacteria
Oil Emulsion/Clay Algae
ET
Sand/Silt/Flocs
Clay/Pollen Algae
∞
Introduction:
AM
PERF
LENGTH
LENGTH
SCREEN AND BASKET SELECTION GUIDE
Choosing the right straining element
DIAMETER
DIAMETER
LENGTH
DI
TITAN
Small Aquatic Life and Debris
Gravel/Crustacea/Twigs
Figure 3:
STYLE 'A'
Cylindrical Screen
Generally used for "Y"
Type Strainers.
DIAMETER
Please send us your prints, samples, or
simply give us your requirements and
let us design a straining element for
you. In most cases, straining elements
can be ordered by referencing Titan
FCI's or any other manufacturers'
strainer model number.
5. Design Type (cone, basket etc.)
6. Flow Direction
7. Open Area % and Length
8. Pressure Ratio
PERF
LENGTH
When ordering, please specify:
1. Pipe Size
2. Straining Element Type
3. Perforation or Mesh
4. Construction Material
LENGTH
Titan FCI can manufacture straining
elements for all types of strainers
including "Y", "T", and basket in a
wide variety of materials. We can
also manufacture conical/temporary
strainers.
Large Aquatic Life
Large Debris/Branches
Titan Flow Control - Standard Screen and Basket Designs
Microns (µm)
4
In some applications requiring finer filtrations, it may be advisable
to strain in gradual steps. This is accomplished by placing
progressively smaller straining elements in series. As always,
a Titan FCI engineer is available to assist you in developing a
solution for any special straining requirements you may have.
Construction Material:
Irregardless of the strainer housing material being used, the
most common construction material used for straining elements
is stainless steel. This is due to the inherent resistance to
corrosion stainless steel provides. As such, Titan FCI's standard
construction material for all straining elements is Type 304
stainless steel. Other materials (316 SS, 316L, and Monel) are
available upon application. Please consult a Titan FCI engineer
for determining the best material for your application.
Titan Flow Control, Inc.
www.titanfci.com
Tel: 910-735-0000
Fax: 910-738-3848
[email protected]
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