SS 904L Instrumentation Tube Fittings Manufacturer, Supplier and Exporter in India
Arrotop manufactures, supplies and exports SS 904L Instrumentation Tube Fittings for chemical plants, refineries, acid-handling systems, heat exchangers, process skids and industrial lines operating under severe corrosive conditions.
The range covers SS 904L connectors, elbows, tees, unions, bulkhead fittings, reducers, adapters, ferrules, tube caps and plugs. Single ferrule and double ferrule fittings are available for imperial and metric instrumentation tubing.
SS 904L is identified as UNS N08904 / EN 1.4539. It is a high-alloy austenitic stainless-steel grade commonly used in chemical and petrochemical equipment, particularly for handling compatible sulphuric acid and other demanding process fluids.
Arrotop supplies standard, custom and replacement UNS N08904 Instrumentation Tube Fittings for EPC contractors, equipment manufacturers, chemical plants, maintenance teams and international buyers.
SS 904L Fittings for Severe Chemical and Acid Service
SS 904L is normally specified where SS 316L or SS 317L does not provide enough corrosion resistance for the process conditions.
The grade contains higher nickel and molybdenum along with copper, which improves its performance in many acidic and chloride-bearing environments. It was originally developed for sulphuric acid service and is also used in phosphoric acid, acetic acid, chemical-processing and refinery applications.
Arrotop supplies SS 904L Tube Fittings for corrosive chemical lines, including fittings for:
- Acid dosing systems
- Chemical injection skids
- Process sampling panels
- Pressure gauge connections
- Transmitter hook-ups
- Valve and manifold tubing
- Tank and reactor instrumentation
- Pump and metering equipment
- Process analyser connections
- Filter and regulator assemblies
The fitting grade should follow the approved process specification. Chemical concentration, temperature, contamination and operating pressure should be included with the enquiry.
Available SS 904L Compression and Ferrule Instrumentation Tube Fittings
Arrotop manufactures the following SS 904L Instrumentation Tube Fittings:
- SS 904L Male Connectors
- SS 904L SS 904LFemale Connectors
- SS 904L Union Connectors
- SS 904L Male Elbows
- SS 904L Female Elbows
- SS 904L Union Elbows
- SS 904L Male Run Tees
- SS 904L Female Run Tees
- SS 904L Male Branch Tees
- SS 904L Female Branch Tees
- SS 904L Union Tees
- SS 904L Straight Unions
- SS 904L Reducing Unions
- SS 904L Bulkhead Male
- SS 904L Connectors
- SS 904L Bulkhead Female Connectors
- SS 904L Bulkhead Unions
- SS 904L Union Crosses
- SS 904L Reducer Port Connectors
- SS 904L NPT Male Adapters
- SS 904L BSPT Couplings
- SS 904L BSPP Plugs
- SS 904L Tube Caps
- SS 904L Tube Plugs
- SS 904L Front Ferrules
- SS 904L Back Ferrules
Both SS 904L single ferrule fittings and SS 904L double ferrule tube fittings can be supplied against individual product requirements or complete fitting schedules.
Features of SS 904L Instrumentation Tube Fittings
- Manufactured in SS 904L / UNS N08904 / EN 1.4539 for process systems requiring a higher-alloy stainless-steel grade.
- The nickel, molybdenum and copper content gives SS 904L better corrosion resistance than SS 316L in many compatible acidic and chloride-bearing conditions.
- Suitable for instrumentation lines handling compatible sulphuric acid and other reducing process media.
- Offers good resistance to pitting and crevice corrosion in many chloride-containing process environments. Final suitability depends on the chemical concentration and operating temperature.
- The low-carbon composition makes SS 904L suitable for welded process skids, analyser systems and fabricated chemical equipment.
- Commonly selected for chemical plants, refineries, acid-handling systems, heat exchangers and corrosive process lines where SS 316L or SS 317L may not meet the material requirement.
- Available in single ferrule and double ferrule designs for imperial and metric instrumentation tubing.
- Grade marking and material traceability help confirm that the fittings are manufactured in UNS N08904 rather than a common 300-series stainless-steel grade.
Technical Specifications of SS 904L Instrumentation Tube Fittings
- Product : SS 904L Instrumentation Tube Fittings
- Material Grades : Stainless Steel 904L
- UNS Designations : UNS N08904
- European Designation : EN / W.Nr. 1.4539
- European Grade : X1NiCrMoCu25-20-5
- Material Type : High-alloy austenitic stainless steel
- Imperial Tube Sizes : 1/16 inch to 1½ inch
- Metric Tube Sizes : 1.5 mm to 38.1 mm
- Thread Types : NPT, BSPT, BSPP, SAE, UNF and Metric Threads
Applications of SS 904L Instrumentation Tube Fittings
SS 904L Instrumentation Tube Fittings are mainly used in chemical plants, refineries, acid-handling systems, heat exchangers and process lines where common SS 316L fittings may not provide enough corrosion resistance.
Typical applications include:
- Sulphuric acid dosing and sampling lines
- Phosphoric acid plant instrumentation
- Chemical injection skid connections
- Acid transfer and metering systems
- Process analyser panel fittings
- Pressure gauge and transmitter hook-ups
- Tank and reactor instrument lines
- Refinery chemical-processing systems
- Petrochemical sampling connections
- Heat exchanger and condenser instrument lines
- Chloride-bearing cooling-water systems
- Valve and manifold tubing in corrosive service
- Pump, filter and regulator connections
- Pulp and paper process equipment
- Mineral and metallurgical processing plants
- Replacement fittings for existing SS 904L installations
SS 904L is widely used in chemical and petrochemical equipment for handling compatible sulphuric acid. The grade is also used in refineries, heat exchangers, tanks, reactor vessels and process equipment exposed to severe corrosion conditions.
Arrotop supplies SS 904L connectors, elbows, tees, unions, bulkhead fittings, reducers, adapters and ferrules for new projects, plant maintenance and replacement requirements. Share the fitting list, tube size, thread details, process fluid, operating temperature and quantity for quotation.
SS 904L Tube Fittings for Sulphuric Acid Systems
Sulphuric acid plants use small-bore tubing for chemical dosing, sampling, pressure monitoring, flow measurement and analyser connections.
SS 904L is commonly used for medium-concentration sulphuric acid service in chemical and petrochemical plants. Its copper and molybdenum content provides better performance than common stainless-steel grades in many suitable acid conditions.
Arrotop supplies SS 904L Instrumentation Tube Fittings for sulphuric acid handling systems, including:
- Acid sampling line fittings
- Sulphuric acid dosing connections
- Chemical transfer skid fittings
- Tank and vessel instrument connections
- Pressure gauge and transmitter fittings
- Process analyser panel connections
- Pump and valve instrument tubing
- Reducers and mixed-thread adapters
The suitability of SS 904L changes with acid concentration, operating temperature and process contamination. Share these details with the RFQ for a proper product review.
UNS N08904 Tube Fittings for Phosphoric Acid and Fertiliser Plants
Wet-process phosphoric acid may contain chlorides, fluorides and other impurities that make the service more corrosive than pure acid.
SS 904L has been used in phosphoric acid production and technical-acid handling systems. The exact material selection still depends on the acid concentration, contaminants, temperature and plant specification.
Arrotop supplies UNS N08904 Compression Tube Fittings for phosphoric acid and fertiliser plants for:
- Acid production skids
- Chemical dosing systems
- Filtration equipment
- Reactor and vessel instrumentation
- Pressure and flow transmitters
- Sampling and analyser panels
- Heat exchanger connections
- Pump and valve instrument lines
Standard fittings, special reducers and drawing-based connections can be supplied for new equipment and plant maintenance.
SS 904L Fittings for Heat Exchangers and Cooling-Water Systems
Heat exchangers, condensers and cooling systems require instrument connections for pressure, temperature, flow and differential-pressure monitoring.
SS 904L is used in selected heat exchangers handling high-temperature water with chloride contamination and in some seawater-cooling applications. It offers better resistance than common SS 316L in many chloride-bearing conditions, but it should not be treated as suitable for every seawater installation.
Available fittings include:
- Heat exchanger inlet and outlet connections
- Condenser pressure fittings
- Cooling-water monitoring connections
- Differential-pressure transmitter fittings
- Temperature instrument hook-ups
- Sampling line fittings
- Valve and manifold connections
- Vent and drain instrument fittings
- Replacement connectors and ferrules
Water temperature, chloride concentration, flow conditions and stagnant areas should be considered before finalising the fitting grade.
SS 904L Instrumentation Fittings for Refineries and Petrochemical Plants
Refineries and petrochemical plants use instrumentation tubing around acid-handling systems, chemical injection skids, analysers, heat exchangers, pumps, tanks and process vessels.
Arrotop supplies SS 904L Instrumentation Fittings for refinery and petrochemical process lines, including:
- Corrosive process sampling connections
- Chemical injection fittings
- Reactor pressure-instrument lines
- Acid-handling skid connections
- Process analyser panel fittings
- Heat exchanger instrument connections
- Valve and manifold tubing
- Tank and vessel instrumentation
- Maintenance replacement fittings
Oil refineries and chemical and petrochemical plants are established application areas for the UNS N08904 grade family.
For existing equipment, share the original fitting part number, material grade, equipment tag or drawing where available.
Custom and Replacement SS 904L Tube Fittings
Imported machinery, older chemical plants and custom process skids may use fittings that are not available in current catalogue dimensions.
Arrotop manufactures custom SS 904L Instrumentation Tube Fittings from drawings, dimensions or unused samples.
Custom requirements may include:
- Metric-to-imperial adapters
- NPT-to-BSP connections
- Special reducing connectors
- Extended male connectors
- Extended female connectors
- Custom bulkhead lengths
- Gauge and transmitter adapters
- Weld-end connectors
- Long-thread fittings
- Reducer port connectors
- Non-standard body dimensions
- Repeat fittings against OEM part numbers
- Replacement fittings for discontinued equipment
For replacement requirements, share the tube OD, thread type, overall dimensions, UNS N08904 material requirement and quantity. A drawing or unused sample is helpful when the thread or ferrule design is not known.
SS 904L Tube Sizes, Threads and Connections
SS 904L Instrumentation Tube Fittings are available for imperial and metric tubing, subject to the fitting design.
Available options include:
- Imperial tube sizes from 1/16 inch to 1½ inch
- Metric tube sizes from 1.5 mm to 38.1 mm
- Tube-to-tube connections
- Tube-to-male thread connections
- Tube-to-female-thread connections
- Equal and reducing connections
- Bulkhead connections
- NPT threads
- BSPT threads
- BSPP threads
- SAE and UNF threads
- Metric threads
- Mixed-thread adapters
- Connections manufactured from drawings
The working pressure depends on the fitting design, tube OD, wall thickness, tubing condition, operating temperature and end connection.
Mention these details in the enquiry instead of requesting one general pressure rating for all fitting sizes.
SS 904L vs SS 316L and SS 317L Instrumentation Tube Fittings
SS 316L is commonly used for general industrial and chemical-process tubing. SS 317L contains more molybdenum and offers better corrosion resistance in many chemical conditions. SS 904L is normally considered when the service is more demanding, and the project calls for a high-alloy grade with additional nickel, molybdenum and copper.
SS 904L Instrumentation Tube Fittings are often specified for sulphuric acid systems, phosphoric acid plants, corrosive refinery lines and chloride-bearing process equipment where SS 316L or SS 317L may not provide the required service life. Official material data also notes that 904L can outperform both 316L and 317L in several acidic environments.
The grades should not be changed only based on price or availability. Process fluid, acid concentration, chloride content, temperature and the approved material specification should decide whether the requirement calls for:
- SS 316L Instrumentation Tube Fittings
- SS 317L Instrumentation Tube Fittings
- SS 904L / UNS N08904 Instrumentation Tube Fittings
Arrotop supplies SS 904L compression tube fittings for severe chemical service, including connectors, elbows, tees, unions, bulkhead fittings, adapters and ferrules. Share the process conditions and original material specification when comparing SS 904L vs SS 316L or SS 317L tube fittings.
SS 904L Fitting Packages for Acid Plant Shutdowns and Maintenance
Acid-plant shutdowns usually require several fitting types for dosing lines, sampling panels, analysers, tanks, reactors, pumps and heat exchangers. Maintenance teams may need standard fittings along with special adapters or replacements for older UNS N08904 installations.
Arrotop supplies SS 904L fitting packages for acid plant shutdowns, refinery maintenance and chemical equipment repairs against bills of materials, marked-up drawings or equipment lists.
A shutdown package may include:
- Male and female connectors
- Male and female elbows
- Run tees and branch tees
- Straight and reducing unions
- Bulkhead connectors and unions
- Front and back ferrules
- NPT, BSPT and BSPP adapters
- Reducer port connectors
- Tube caps and plugs
- Special replacement fittings
- Drawing-based connectors and adapters
The fittings can be grouped equipment-wise or line-wise to simplify purchasing and site identification. Material certificates, heat-number traceability and inspection documents can also be included when agreed at the quotation stage.
For SS 904L fittings for sulphuric acid plant maintenance, share the fitting schedule, tube size, thread details, process medium, quantity, required certificates and delivery schedule.
SS 904L Tube Fittings for Scrubbers and Flue-Gas Cleaning Systems
Wet scrubbers and flue-gas cleaning systems use instrumentation tubing for pressure monitoring, chemical dosing, pH measurement, wash-water control and gas sampling. These lines may handle acidic condensate, chlorides and treatment chemicals.
Arrotop supplies SS 904L Tube Fittings for scrubber and emission-control equipment, including:
- Scrubber pressure-line fittings
- Differential-pressure transmitter connections
- Chemical dosing fittings
- pH analyser tubing connections
- Flue-gas sampling fittings
- Wash-water monitoring connections
- Condensate sampling fittings
- Valve and manifold connections
- Filter and regulator fittings
- Custom NPT and BSP adapters
SS 904L may be specified for flue-gas cleaning systems where the process conditions require better corrosion resistance than common stainless-steel grades. The final material should follow the scrubber design, process chemicals and approved project specification.
For UNS N08904 fittings for scrubber and emission-control systems, share the equipment drawing, fitting list, tube OD, thread details, operating conditions and required quantity.
SS 904L Instrumentation Fittings for Pulp and Paper Bleaching Equipment
Pulp and paper bleaching systems use chlorine-based chemicals, acidic process fluids and wash solutions that can be more demanding than normal mill utility service.
SS 904L is used in pulp and paper bleaching equipment where acidic chemicals and chlorine-based process media require better corrosion resistance than common stainless-steel grades.
Arrotop supplies SS 904L Instrumentation Fittings for pulp and paper bleaching equipment, including connections for:
- Bleaching chemical dosing lines
- Process sampling panels
- Pressure and flow transmitters
- Bleach towers and process vessels
- Chemical storage and transfer skids
- Wash-water monitoring systems
- Heat exchanger instrumentation
- Valve and manifold tubing
- Filter and pump connections
- Maintenance replacement requirements
Standard and custom SS 904L Tube Fittings for pulp and paper plants can be supplied against equipment drawings, fitting schedules or existing samples.
Share the bleaching chemical, operating temperature, tube size, thread details, quantity and material certificate requirements for quotation.
Request a Quote for SS 904L Instrumentation Tube Fittingses, Threads and Connections
Arrotop supplies SS 904L Instrumentation Tube Fittings for sulphuric acid systems, phosphoric acid plants, chemical-processing units, refineries, heat exchangers and corrosive process lines.
For a quotation, share the required fitting type, UNS N08904 or EN 1.4539 grade, tube OD, wall thickness, thread type, pressure, temperature, process fluid, concentration, quantity and certificate requirements. Arrotop manufactures and exports standard, custom and replacement SS 904L ferrule tube fittings from Mumbai, India, for domestic and international requirements.