FIA strainers are a range of angleway and
straightway strainers, which are carefully
designed to give favourable ow conditions.
The design makes the strainer easy to install,
and ensures quick strainer inspection and
cleaning.
FIA strainers are used ahead of automatic
controls, pumps, compressors etc., for initial
plant start-up and where permanent ltration
of the refrigerant is required. The strainer
reduces the risk of undesirable system
breakdowns and reduces wear and tear on
plant components.
FIA strainers are equipped with a screen mesh
of stainless steel, available in sizes 100, 150, 250
and 500μ (microns*), (US 150, 100, 72, 38
mesh*).
* Mesh is the number of threads per inch. μ
(microns) is the distance between two threads
(1μ = 1 /1000 mm).
AI367729235609en-000101
Strainer housing, type FIA 65
Features
• Modular Concept:
◦ Each valve housing is available with DIN and ANSI butt weld connection and in several dierent sizes.
◦ Possible to convert FIA strainers to any other product in the SVL family (Shut-o valve, regulating valve, check &
stop valve or check valve) just by replacing the complete top part.
• Quick and easy maintenance. Replacement of top part does not require welding.
• Filter net of stainless steel mounted direct without extra gaskets means easy servicing.
• Two types of strainer inserts are available:
◦ A plain insert made of stainless steel.
◦ A pleated insert (DN 15-200) with extra large surface, which ensures long intervals between cleaning and low
pressure drop.
• FIA 15-40 (½ – 1 ½ in.):
A special insert (50μ) can be used in combination with a standard version when cleaning a plant during
commissioning.
• FIA 50-200 (2 - 8 in.):
A large capacity lter bag (50μ) can be inserted for cleaning plant during commissioning.
• FIA 65-200 (2½ - 8 in.) can be equipped with a magnetic insert for detention of iron particles and other magnetic
particles.
• Each strainer clearly marked with type, size and performance range
• Housing and bonnet of low temperature steel in accordance with the requirements of the Pressure Equipment
Directive and those of other international classication authorities
• Classication: DNV, CRN, BV, EAC etc. To get an updated list of certication on the products please contact your
local Danfoss Sales Company.
• Equipped with 42CrMo5 bolts to withstand high pressure.
Media
Refrigerants
Applicable to HCFC, HFC, R717 (Ammonia), R744 (CO₂) and ammable refrigerants.
For further information refer to the product instruction for FIA.
New refrigerants
Danfoss products are continually evaluated for use with new refrigerants depending on market requirements.
When a refrigerant is approved for use by Danfoss, it is added to the relevant portfolio, and the R number of the
refrigerant (e.g. R513A) will be added to the technical data of the code number. Therefore, products for specic
refrigerants are best checked at store.danfoss.com/en/, or by contacting your local Danfoss representative.
The design ts with all copper pipes having following tolerance to the nominal diameter.
Table 7: Tolerance for nominal diameter
Table 8: Available SVL products for 65 bar (943 psi)
(1)
(1)
To be used for SCA-X, CHV-X (all sizes) and REG-SA/SB (sizes 10 to 40).
To be used for SCA-X, CHV-X (all sizes) and REG-SA/SB (sizes 10 to 40).
x = Available
Design
Strainer Insert
A lter grid and lter net of stainless steel ensure long element life. The lter net oers a very high degree of
cleanability.
Housing
The strainer housing is made of special, cold resistant steel.
Installation/Maintenance
The strainer is designed to resist high internal pressures. However, the piping system in general should be designed
to avoid liquid traps and reduce the risk of hydraulic pressure caused by thermal expansion.
Install the strainer with the cover in downward position.
Danfoss recommends replacement/cleaning of the strainer when the dierential pressure loss >0.5 bar (7.3 psi) in
the liquid line and >0.05 bar (0.7 psi) in the suction line. The max. permissible dierential pressure is 1 bar (15 psi).
First start up:
(Use strainer element with removable insert for FIA DN15-40 or separate lter bag
for FIA DN 50-200. 50μ insert should normally
be removed after the rst 24 hours of operation)
50μ
Ahead of pumps:
500μ [38 mesh]
After pumps:
150μ [100 mesh] / 250μ [72 mesh]
In front of AKVA valves:
100μ [150 mesh]
Generally
150μ [100 mesh] / 250μ [72 mesh]
Sensitive equipment, e.g.
suction regulators with low temperature
250μ [72 mesh]
Ahead of screw compressor
250μ [72 mesh]
Ahead of piston compressor
150μ [100 mesh]
Connection
size (DN)
μ
Mesh
Wire
Wire
Free space
Screen area
Plain elements
Pleated elements
FIAmmin.
%
cm2in2cm2in
2
15 - 20
(½” - ¾”)
100
0.068
0.0033525
3.9457.0
150
100
0.10
0.0043625
3.9457.0
250720.10
0.0045125
3.9457.0
500380.16
0.006
57.6253.9457.0
25 - 40
(1” - 1½”)
100
0.068
0.003357111160
25.0
150
100
0.10
0.004367111160
25.0
250720.10
0.004517111160
25.0
500380.16
0.006
57.67111
160
25.0
Strainer housing, type FIA 65
For further information refer to installation instruction for FIA.
Figure 5: Example of marking ring, FIA
Selection of strainer size
The mesh aperture size of the strainer must satisfy the requirements stated by the suppliers of the equipment to be
protected.
The following recommendations of aperture size apply in general to refrigeration installations:
Table 9: All lines
Table 10: Liquid Lines
Table 11: Protection of automatic regulation equipment
Table 12: Suction Lines
NOTE:
Mesh is the number of threads per inch. μ (microns) is the distance between two threads (1μ = 1 /1000 mm).
The list contains all certicates, declarations, and approvals for this product type. Individual code number may have
some or all of these approvals, and certain local approvals may not appear on the list.
Some approvals may change over time. You can check the most current status at danfoss.com or contact your local
Danfoss representative if you have any questions.
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