CENTER PIPE
Center pipe is a cylindrical element placed in the radial flow reactor center to collect or to distribute flow.It will be installed through manhole on top of the vessel and will be supported to maintain in its position.
when flow direction is inward though the center pipe,process flow will have highest temperature &highest concentration after reaction at center pipe location,so it will come from highest grade of stainless steel material such as SS.321/SS.347 or nickel base alloy steel such as Inconel 600/625.
Gas flow and pressure drop through the catalyst bed are required process conditions to define diameter,length and perforation ratio meanwhile catalyst weight,axial and radial loads are key parameters for mechanical strength calculation against burst and collapse forces.

Center pipe will come from a combination of a smooth V-Wire screen layer with vertical wires as outer layer in contact with catalyst assembled on a perforated cylinder as inner support.
Perpendicularity of center pipe than vessel cross section,smooth outer surface,regular arrangement of holes and high precision slots are some key characters in fabrication of center pipes.

SLW ADVANTAGES
▶Custom design that fit the application or detailed design as per specification.It can be designed for any mechanical load and catalyst size in any height and diameter.
▶V-Wire screen with high open area which is balanced by accurate sizing,precise manufacturing,and tight dimensionalcontrol of the overall assembly including its flow distribution system and tight slot tolerances(50μ).
▶Plumpness and straightnessare checked,using laser controltools duringeach production step,in order to ensure that the equipment can perfectly be centered to the vessel axis during installation.
▶ Tight tolerances are matched for the full equipment as well as with its vessel interface in such a way that there is no damage to the catalyst during operation and no possibility for the catalyst to escape.
▶To ensure that all requirements are applied during installation,Seliwei screens will provide technical assistance for onsite operation at customer's site.

OUTER BASKET
Outer basket is the outer internal component of radial flow reactor whichis concentric by center pipe.It has a little distance with vessel inside wall that allows flow to swirl and come through in or out.The outer basket will come from one single piece construction method that has to be installed over the full vessel cross section so it should be installed inside reactor before welding of top head.
Outer basket is self-standing on a support ring attached to vessel inside wall.Annular space between that and center pipe on top of the bed will be blinded by cover plate assembly.
Gas flow and pressure drop through the catalyst are required process conditions to define diameter,length and perforation ratio meanwhile catalyst weight,axial and radial load are key parameters for mechanical strength calculation against burst and collapse forces.
Outer basket will come from a smooth V-Wire screen layer with vertical wires in contact with catalyst,in some cases a perforated cylinder willbe used as outer support.
Perpendicularity of outer basket than vessel cross section,smooth inner surface,regular arrangement of holes and high precision slots are some key characters in fabrication of outer baskets.

SLW ADVANTAGES
Custom design that fit the application or detailed design as per specification.It can be designed for any mechanical load and catalyst size in any height and diameter.
V-Wire screen with high open area which is balanced by accurate sizing,precise manufacturing,and tight dimensional control of he overall assembly including its flow distribution system and tight slot tolerances(50μ).
Plumpness and straightness are checked,using laser controltools during each production step,in order to ensure that the equipment can perfectly be centered to the vessel axis during installation.
Tight tolerances are matched for the full equipment as well as with its vessel interface in such a way that there is no damage to the catalyst during operation and no possibility for the catalyst to escape.
However due to its weight,tight tolerances and sealing requirements,it is recommended to install outer basket once the vesselhas been erected in its final position vertically and before welding top head,but Seliwei screens will provide required aspects to install outer basket horizontally through the vessel in vessel manufacturer's shop.
To ensure that all requirements are applied during installation,Seliwei screens will provide techncal assistance for onsite operation at customer's site.

SCALLOPS
Scallops is an assembly of D-shaped segments which extend parallel to vessel height where the outer surface of each scallop willbe tangent to vessel inner walland the inner surface will show bed criteria.
Each scallops will be passed though manhole while in totala assembly each scallop will be placed adjacent to side one.They are self-standing on a support ring attached to vessel inside wall and will be fixed by an expander ring in required levels.
Annular space between that and center pipe on top of the bed will be blinded by cover plate assembly.
Gas flow and pressure drop through the catalyst are required process conditions to define required cross section area,length and perforation ratio meanwhile catalyst weight,axial&radial loads are key parameters for mechanical strength calculation against burst and collapse forces.
Since scallops will have contact with vessel inner wall,in case of high temperature operations,due to avoid hot spots on the vessel shll,maybe some refractory of liner materials applied on the vessel inner shell.
Because of easier installation/maintenance and increasing catalyst volume,scallops will be preferred to old outer baskets design.
There are many configuration for manufacturing scallops:
-Slotted liner
-V-Wire Screen
-Combination of V-Wire Screen and Perforated plate.
Perpendicularity of scallops than vessel cross section,an integrated and adjacent Final assembly,smooth outer surface and high precision slots are some key characters in fabrication of scallops.

SLW ADVANTAGES
▶ Scallops is mechanically designed by considering the loads applied on the equipment during operation.
▶ V-Wire screen with high open area which is balanced by accurate sizing,precise manufacturing,and tight dimensional control of the overall assembly including its flow distribution system and tight slot tolerances(50μ).
▶ Plumpness and straightness are checked,using laser control tools during each production step,in order to ensure that the equipment can perfectly be centered to the vessel axs during installation.
▶ Gap between scallops will be considered in order to match vessel tolerances and different thermal expansion.
▶ To ensure that all requirements are applied during installation,Seliwei screens will provide technical assistance for onsite operation at customer's site.

PROCESS REPLACEMENT PARTS
Oleflexm Process Replacement Parts provide end users with a proven supplier and trusted partner that provides end users with parts that withstand the horshest conditions,all while protecting expensive catalysts.We are is a globa manufacture of profiled wire used in a multitude of refinery applications and reactor internals though out the world.
Oleflex Reactor internals are manufactured,supplied and designed using patented technology that has developed.

OUTER SCREEN
Utilizes patented one piece channel rod technology for themonufacturing of the Outer Screen Assembly.The single piece design ensurehigh strength,high reliability and exacting perforation patterns to maximize theefficiency of the gas flow across the catalyst.The channel rod design is uniqueond has been supplied by to Olefex reactor internals for over30 yecrs.

INNER SCREEN
Attention to detailswhen building Oleflex Inner Screensallows for exacting stondords and aproduct that performs to desigmed tothe specification.
▶Various option in T-rod design to ensure maximum process
▶Goes throughgreat steps of exactly place T-Rodsto precisely control gas fow and maximize output
▶ Control slot accuracy during production
▶Outer base and support plate welds are smooth so there will be no damage to catalyst, no hangups and a smooth catalystflow
▶Non-binding screen

PLUG DISTRIBUTOR
Plug Distributor allows for the even distribution of the gas,ensuring maximum return on investment.
▶Continuous vessel pressures
▶Reliability and quality workmanship
▶Intensive inspection processes and proper finishing of welds,ensures catalyst will not be damaged
▶Variety of exotic material available
▶Built to withstond high temperatures and extreme conditions

CATALYST REGENERATION
▶ Quality Workmonship
▶ Variety of exotic materials available
▶ Can be constructed to withstand high temperatures and extreme conditions

AMMONIA SYNTHESIS CONVERTOR
One of the most important equipment in an ammonia plant we can call it the heart of plant is "Ammonia Synthesis Converter",where ammonia will be produced from Nitrogen and Hydrogen by synthesis reaction.
Generally to reach higher conversion of synthesis gas into ammonia and hence increased production efficiency,this equipment will come in multiple catalyst bed restricted by an internal basket.
With the number of ammonia synthesis converter basket installation &under operating equipmentSeliwei screens is now a well-known local designer &manufacturer of this type of equipment who has worked on many licensor's design in fertilization plants.