SS 304H Instrumentation Tube Fittings Manufacturer, Supplier and Exporter in India
Arrotop is a manufacturer, supplier and exporter of SS 304H Instrumentation Tube Fittings for high-temperature process lines, refinery instruments, boiler auxiliaries, heat exchanger connections and other systems where standard SS 304L may not provide the required strength at elevated temperatures.
The range includes SS 304H Compression Tube Fittings, single ferrule fittings and double ferrule tube fittings for connecting instrumentation tubing with gauges, valves, manifolds, transmitters and process equipment. Standard products are available along with custom connectors, reducers and adapters manufactured against drawings.
SS 304H is not simply another name for SS 304 or SS 304L. Its carbon level is controlled to support better tensile and yield strength during elevated-temperature service. The principal material designations are UNS S30409 and EN 1.4948. Some specifications may also refer to the 304/304H family with EN 1.4301, so the exact grade, product standard and certificate requirement should be confirmed before ordering.
SS 304H Tube Fittings for High-Temperature Instrument Lines
SS 304H Instrumentation Tube Fittings are mainly selected where the fitting and tubing remain exposed to heat during regular plant operation. Typical locations include instrument take-off lines near boilers, furnaces, heat exchangers, hot process vessels and refinery equipment.
The higher-carbon chemistry gives SS 304H an advantage over SS 304L when elevated-temperature mechanical strength forms an important part of the material selection. It does not, however, make the grade more corrosion resistant than every other stainless steel.
For welded systems, the complete service condition needs review. Where resistance to intergranular corrosion after welding is more important than hot strength, SS 304L may be the better choice. Where the system handles chlorides, seawater or more aggressive process media, SS 316H, Duplex or another alloy may be required.
SS 304H Compression and Ferrule Instrumentation Tube Fitting Range
Arrotop supplies SS 304H Instrumentation Fittings in tube-to-tube, tube-to-thread and reducing configurations.
The product range includes:
- SS 304H Male Connectors
- SS 304H Female Connectors
- SS 304H Union Connectors
- SS 304H Male Elbows
- SS 304H Female Elbows
- SS 304H Union Elbows
- SS 304H Male Run Tees
- SS 304H Female Run Tees
- SS 304H Male Branch Tees
- SS 304H Female Branch Tees
- SS 304H Union Tees
- SS 304H Bulkhead Male Connectors
- SS 304H Bulkhead Female Connectors
- SS 304H Bulkhead Unions
- SS 304H Reducing Unions
- SS 304H Union Crosses
- SS 304H Reducer Port Connectors
- SS 304H NPT Male Adapters
- SS 304H BSPT Couplings
- SS 304H BSPP Plugs
- SS 304H Front and Back Ferrules
- SS 304H Tube Caps and Tube Plugs
Both Grade 304H Stainless Steel Single Ferrule Fittings and SS 304H Double Ferrule Tube Fittings can be manufactured to suit the tube size, connection type and project specification.
Where SS 304H Instrumentation Tube Fittings Are Used
SS 304H fittings are generally considered for instrumentation lines connected to equipment operating at elevated temperatures.
- Common requirements include:
- Boiler pressure and temperature instrument lines
- Refinery process instrumentation
- Furnace monitoring and control connections
- Heat exchanger instrument hook-ups
- Hot condensate monitoring lines
- High-temperature sampling systems
- Steam-related instrument connections
- Petrochemical process units
- Hot oil circulation systems
- Instrument lines on heated vessels and reactors
- Power plant auxiliary systems
- Chemical plants handling compatible hot process media
- High-temperature test rigs
- OEM heating and thermal-processing equipment
Custom SS 304H Tube Fittings for Hot-Service Equipment
High-temperature instrumentation packages often require connections that are not available as regular catalogue products. Arrotop manufactures custom UNS S30409 Instrumentation Tube Fittings from customer drawings, samples or dimensional details.
Custom requirements may include:
- Tube-to-thread adapters
- Unequal reducing connectors
- Extended-body fittings
- Instrument and gauge adapters
- Special bulkhead connections
- Metric-to-imperial transitions
- NPT-to-BSP thread combinations
- Custom thread lengths
- Weld-end connections
- Fittings for restricted installation spaces
- Special body dimensions and wrench flats
- Heat-number or customer-specific marking
- Repeat components for OEM equipment
Send the drawing, material grade, operating temperature and required quantity for review and quotation.
SS 304H Tube Fittings for Refinery, Boiler and Thermal Equipment Projects
Arrotop supplies SS 304H Instrumentation Tube Fittings for refinery packages, boiler systems, heat exchanger assemblies, thermal equipment and other projects involving hot-service instrumentation.
Orders may cover individual replacement fittings, OEM repeat components or complete fitting schedules containing connectors, elbows, tees, unions, bulkhead fittings, ferrules and custom adapters.
Features of SS 304H Instrumentation Tube Fittings
- Manufactured from SS 304H / UNS S30409 / EN 1.4948 material as specified in the order.
- The controlled carbon content helps SS 304H retain better strength at elevated temperatures than SS 304L.
- Suitable for hot instrument lines near boilers, furnaces, heat exchangers, refinery equipment and heated process vessels.
- Available in single ferrule and double ferrule designs for different tubing and project requirements.
- Suitable for use with matching SS 304H tubing and compatible high-temperature system components.
- Custom connectors, reducers, adapters and special tube-to-thread combinations can be manufactured from drawings.
- Material traceability helps confirm that the fittings meet the required UNS S30409 grade rather than standard SS 304.
- A practical choice for elevated-temperature applications where the additional corrosion resistance of SS 316H or a higher alloy is not required.
Technical Specifications of SS 304H Instrumentation Tube Fittings
- Product : SS 304H Instrumentation Tube Fittings
- Material Grades : SS 304H
- Grade Designation : UNS S30409, EN 1.4948
- Design : Single Ferrule & Double Ferrule
- Raw Material Standard : ASTM A479 for machined bar stock and ASTM A182 Grade F304H for forged components, as applicable
- Imperial Tube Sizes : 1/16″ to 1½”
- Metric Size : 1.5 mm to 38.1 mm
- Pressure Rating : Up to 6000 PSI
- Thread Types : NPT, BSPT, BSPP, SAE, UNF and Metric
- Surface Finish : Natural Machined Finish or Project-Specific Finish
Applications of SS 304H Instrumentation Tube Fittings
SS 304H Instrumentation Tube Fittings are mainly used on hot instrument lines connected to boilers, furnaces, heat exchangers and refinery equipment. The grade is selected when the fittings need better strength at elevated temperatures than SS 304L.
- SS 304H tube fittings for boiler pressure gauge lines
- Pressure transmitter connections on industrial boilers
- High-temperature instrument lines near furnaces
- SS 304H fittings for heat exchanger monitoring lines
- Refinery pressure and temperature instrument hook-ups
- Hot oil sampling and measurement lines
- Instrument connections on heated pressure vessels
- Steam and condensate instrument lines
- Power plant boiler auxiliary instrumentation
- SS 304H compression fittings for petrochemical process units
- Tube connections on industrial heating equipment
- Instrumentation lines on thermal-processing systems
- OEM boiler and furnace assemblies
- Replacement fittings for existing UNS S30409 tube systems
- Custom SS 304H fittings for high-temperature instrument panels and skids
SS 304H vs SS 304L for High-Temperature Instrument Lines
SS 304H and SS 304L are used for different operating conditions. SS 304H is mainly selected for hot instrument lines where the fitting needs to retain better strength at elevated temperatures. It is commonly specified for boiler connections, furnace instrument lines, heat exchangers and refinery equipment.
SS 304L is generally used for welded assemblies where the lower carbon content is more important than high-temperature strength.
For SS 304H tube fittings for boiler and high-temperature instrument lines, mention UNS S30409 or EN 1.4948 clearly in the RFQ. Writing only “SS 304” may result in the standard grade being quoted.
Arrotop supplies SS 304H connectors, elbows, tees, unions, adapters and ferrules in standard and custom configurations. Share the fitting type, tube size, pressure, temperature, quantity and process media for price and availability.
SS 304H Single Ferrule vs Double Ferrule Fittings for Hot Service
Arrotop manufactures SS 304H single ferrule fittings and SS 304H double ferrule tube fittings for boiler, furnace, refinery and thermal equipment instrumentation.
A single ferrule fitting uses one ferrule to grip and seal the tube. A double ferrule fitting uses a front ferrule for sealing and a back ferrule for gripping.
The correct design depends on the existing fitting system, tube specification, pressure, temperature and vibration at the installation point. A double ferrule fitting should not automatically be treated as suitable for a higher pressure.
Both designs are available in connectors, elbows, tees, unions, bulkhead fittings and adapters. Send the required ferrule design, tube OD, thread type and quantity for a quotation on SS 304H ferrule fittings for hot-service instrument lines.
Tubing Requirements for SS 304H Compression Fittings
The tube used with an SS 304H compression fitting must have the correct outside diameter, wall thickness and surface condition. Matching only the tube OD is not enough.
Share these details with your enquiry:
- Tube outside diameter
- Tube wall thickness
- Tube material grade
- Seamless or welded tube
- Maximum pressure and temperature
The tube should be round and free from deep scratches, dents or damaged ends where the ferrules make contact.
Arrotop can supply UNS S30409 compression tube fittings for imperial and metric tubing. Send the complete tube specification for product selection, pressure review and commercial quotation.
Replacement SS 304H Fittings for Existing Hot-Service Systems
Arrotop supplies replacement SS 304H Instrumentation Tube Fittings for boilers, furnaces, heat exchangers, refinery equipment and existing UNS S30409 tubing systems.
Replacement products include:
- Male and female connectors
- Elbows and tees
- Straight and reducing unions
- Bulkhead fittings
- Front and back ferrules
- Reducer port connectors
- NPT adapters
- BSPT couplings
- BSPP plugs
SS 304H Fittings for Thermal Cycling Applications
Boilers, furnaces, hot oil systems and batch heating equipment regularly move between hot and cold operating conditions. These temperature changes can cause tubing to expand, contract and place extra load on the fitting connection.
SS 304H fittings may be used for:
- Boiler start-up and shutdown instrument lines
- Furnace pressure and temperature connections
- Hot oil process skids
- Heated vessels and reactors
- Heat exchanger monitoring lines
- Thermal testing equipment
Replacement SS 304H Fittings for Existing Hot-Service Systems
Arrotop supplies replacement SS 304H Instrumentation Tube Fittings for boilers, furnaces, heat exchangers, refinery equipment and existing UNS S30409 tubing systems.
Replacement products include:
- Male and female connectors
- Elbows and tees
- Straight and reducing unions
- Bulkhead fittings
- Front and back ferrules
- Reducer port connectors
- NPT adapters
- BSPT couplings
- BSPP plugs
When SS 304H Instrumentation Fittings Should Not Be Used
SS 304H is mainly chosen for strength at elevated temperatures. It is not automatically suitable for every hot or corrosive process line.
SS 304H may not be the right material for:
- Seawater and marine systems
- Hot fluids containing high chlorides
- Concentrated brine
- Strong acids
- Aggressive chemical mixtures
- Systems where corrosive condensate forms during shutdown
- Applications requiring higher pitting and crevice-corrosion resistance
- Welded systems where a low-carbon stainless steel grade is specified
SS 304H should not replace SS 316H, SS 321H, SS 347H or a higher alloy only to reduce the fitting cost. The operating fluid, chloride level, pressure and temperature need to be considered together.