Main Distribution Header for Urea Melt Systems | Specifications & Verification

Product Specifications

Technical details and manufacturing context for Main Distribution Header

Definition

In a Urea Melt Distribution System, the Main Distribution Header serves as the central distribution point that collects urea melt from the main production or storage source and evenly distributes it to various downstream branches, reactors, or processing equipment. It ensures consistent flow and pressure to all connected lines while maintaining system integrity and preventing backflow or contamination. The header is typically constructed from stainless steel grades such as 316L or duplex stainless steel to withstand the corrosive nature of urea melt and high operating temperatures. Key design parameters include nominal diameters ranging from DN50 to DN300, design pressures of 1.0–1.6 MPa, and design temperatures of 150–200°C. Flow capacity is typically 10–50 m³/h based on a maximum velocity of 1.5 m/s, with a pressure drop of 0.05–0.15 MPa. Wall thickness ranges from 3.0 to 8.0 mm (Sch 40S–80S), and surface roughness is maintained at 0.4–0.8 µm Ra to reduce fouling. End connections are flanged RF per ASME B16.5, and insulation thickness of 50–100 mm is applied to maintain process temperature. The header is designed to meet leakage rate requirements of ≤0.01 mL/min Rate A. Weight varies from 50 to 500 kg depending on length and schedule. All values are reference ranges and must be verified for the specific model and application with the legal manufacturer or supplier. Standards such as ISO 6708, ISO 4126, ASTM A312, ASME B36.10, and ISO 4287 are used as procurement references. The header's internal design may include baffles or flow dividers to ensure even distribution, and pressure regulators or flow control valves can be integrated to maintain consistent flow rates. Proper selection requires consideration of downstream line sizes, process conditions, and material compatibility. Regular inspection for corrosion, erosion, and fouling is essential to maintain performance and safety.

Working Principle

Urea melt flows into the Main Distribution Header under controlled pressure and temperature. The header's internal design (including baffles, flow dividers, or multiple outlets) ensures even distribution to all connected branches. Pressure regulators and flow control valves may be integrated to maintain consistent flow rates to each downstream line. The header operates within a design pressure of 1.0–1.6 MPa and temperature of 150–200°C, with a flow capacity of 10–50 m³/h. The pressure drop across the header is typically 0.05–0.15 MPa, indicating proper sizing. The header is constructed from stainless steel 316L or duplex stainless steel to resist corrosion from urea melt. Surface roughness of 0.4–0.8 µm Ra minimizes fouling, and insulation of 50–100 mm maintains process temperature. The header is designed to achieve a leakage rate of ≤0.01 mL/min. Proper operation requires monitoring of flow rates, pressures, and temperatures to ensure even distribution and prevent backflow or contamination.

Common Materials

Stainless Steel 316L, Duplex Stainless Steel

Technical Parameters

Parameter	Typical range	Notes & selection driver
Nominal Diameter	DN50–DN300 mm	Matches downstream line sizesISO 6708
Design Pressure	1.0–1.6 MPa
Design Temperature	150–200 °C	Above 200°C material strength dropsISO 4126
Flow Capacity	10–50 m³/h	Based on 1.5 m/s max velocity
Pressure Drop	0.05–0.15 MPa	Higher drop indicates undersizing
Material Grade	316L	Corrosion resistance for urea meltASTM A312
Wall Thickness	3.0–8.0 mm	Sch 40S–80SASME B36.10
Surface Roughness	0.4–0.8 µm Ra	Smoother reduces foulingISO 4287
End Connection	DN50–DN300 mm	Flanged RFASME B16.5
Weight	50–500 kg	Depends on length and schedule
Leakage Rate	≤0.01 mL/min	Zero visible leakage
Insulation Thickness	50–100 mm	Maintains process temperatureISO 12241

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Inlet Flange Part
Connects the header to the main urea melt supply line

Material: Stainless Steel
Outlet Nozzles Part
Connection points for downstream distribution lines

Material: Stainless Steel
Pressure Relief Valve
Prevents overpressure in the distribution system

Material: Stainless Steel with PTFE seals
Thermal Insulation Jacket
Maintains urea melt temperature and prevents solidification

Material: Mineral wool with aluminum cladding
Header Body
The jacketed pipe/manifold itself — the product is named for it.

Material: 316L or duplex stainless steel
Baffles or Flow Dividers Optional
Even out the split between branches inside the header, on designs that use them.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Urea Melt Distribution System

View system integration details

Manufacturers of Main Distribution Header

Manufacturer profiles associated with Main Distribution Header.

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Frequently Asked Questions

What materials are used for the Main Distribution Header?

The header is typically made of stainless steel 316L or duplex stainless steel, as listed in the reference data. These materials provide corrosion resistance suitable for urea melt service. Always confirm the exact material grade with the manufacturer for your specific application.

What are the typical design pressure and temperature ranges?

The design pressure range is 1.0–1.6 MPa, and the design temperature range is 150–200°C. These are reference values; actual design limits depend on the specific model and must be verified with the manufacturer.

How is even distribution achieved?

Even distribution is achieved through the header's internal design, which may include baffles, flow dividers, or multiple outlets. Additionally, pressure regulators and flow control valves can be integrated to maintain consistent flow rates to each downstream line.

What standards apply to the Main Distribution Header?

Relevant standards include ISO 6708 for nominal diameters, ISO 4126 for temperature, ASTM A312 for material grade, ASME B36.10 for wall thickness, and ISO 4287 for surface roughness. These are procurement references; compliance must be confirmed with the manufacturer.

Data Basis

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pressure:	Up to 25 bar (design pressure)
flow rate:	10-500 m³/h (depending on diameter)
temperature:	-20°C to 150°C
slurry concentration:	Up to 40% solids by weight

Main Distribution Header

Product Specifications

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards