Spray Headers

Product Specifications

Technical details and manufacturing context for Spray Headers

Definition

Spray headers are pressurized distribution manifolds that divide one cooling-fluid inlet across multiple nozzle outlets. Header diameter, internal volume and port layout determine pressure distribution and spray uniformity across the target surface. Procurement should compare total flow, working pressure, port count and spacing, inlet and outlet connections, wall thickness, material, surface finish, fluid temperature, mounting, duty cycle and access for inspection. The connected nozzles must be selected against the required per-nozzle flow and coverage. Typical inlet connection sizes range from 1/2" to 4" NPT or BSP, with outlet port counts from 2 to 24 and port spacing from 50 to 300 mm. Maximum working pressure is typically 10 to 100 bar, with flow rate capacity from 5 to 500 L/min. Materials commonly specified include stainless steel 304/316/316L, carbon steel, and brass, with wall thicknesses from 2 to 10 mm. End connections may be threaded, flanged, welded, or quick-connect. Surface finish ranges from Ra 0.8 to 3.2 µm, and temperature ratings from -20 to 200 °C. Duty cycle can be continuous or intermittent, with service life typically 10 to 20 years. Fluid temperature and working pressure must stay within the specified ranges to avoid material degradation, seal failure, or poor atomization. Ambient environment considerations include indoor/outdoor, washdown, or corrosive atmospheres. Relevant standards for verification include ASME B31.1, ASME B16.5, ASME B1.20.1, ASTM A312, ASTM A53, ASTM B16, ASME B36.10M, and ASME B46.1. Always verify model-specific values and standards with the legal manufacturer or supplier.

Working Principle

Pressurized cooling fluid enters the spray header through an inlet connection. The header's internal manifold design distributes the fluid evenly to multiple outlet ports where spray nozzles are attached. The header maintains consistent pressure and flow rate to all connected nozzles, enabling uniform spray coverage over the target surface or area being cooled. The internal geometry, including diameter and volume, influences pressure drop and distribution. Proper selection of port count and spacing ensures even coverage. The header must be matched to the system's flow and pressure requirements, and the nozzles must be chosen to achieve the desired spray pattern and droplet size.

Common Materials

Stainless Steel 304/316, Carbon Steel, Brass

Technical Parameters

Parameter	Typical range	Notes & selection driver
Inlet connection size	1/2" - 4" NPT or BSP inches	1/2" - 4" NPT or BSP — Match to existing piping system. Match to existing piping system.ASME B1.20.1
Number of outlet ports	2 - 24 ports	2 - 24 — Depends on spray coverage area and nozzle spacing. Depends on spray coverage area and nozzle spacing.
Outlet port spacing	50 - 300 mm	50 - 300 — Determines spray pattern uniformity. Determines spray pattern uniformity.
Maximum working pressure	10 - 100 bar	10 - 100 — Higher pressure requires thicker wall and stronger material. Higher pressure requires thicker wall and stronger material. Outside this range: Exceeding maximum pressure can cause rupture or leakage at joints. Below minimum may result in poor spray atomization.ASME B31.1
Flow rate capacity	5 - 500 L/min	5 - 500 — Depends on nozzle flow requirements and header size. Depends on nozzle flow requirements and header size. Outside this range: Exceeding design flow may cause pressure drop and uneven distribution. Below minimum may cause nozzle clogging or poor coverage.
Material of construction	SS304, SS316, SS316L, Carbon Steel, Brass	SS304, SS316, SS316L, Carbon Steel, Brass — SS316L for corrosive or high-temperature fluids; carbon steel for cost-sensitive applications; brass for low-pressure water. SS316L for corrosive or high-temperature fluids; carbon steel for cost-sensitive applications; brass for low-pressure water.ASTM A312, ASTM A53, ASTM B16
Wall thickness	2 - 10 mm	2 - 10 — Must withstand maximum working pressure with safety factor. Must withstand maximum working pressure with safety factor.ASME B36.10M
End connections	Threaded, flanged, welded, or quick-connect	Threaded, flanged, welded, or quick-connect — Flanged for large sizes, threaded for small, welded for permanent installations. Flanged for large sizes, threaded for small, welded for permanent installations.ASME B16.5
Surface finish	Ra 0.8 - 3.2 µm	Ra 0.8 - 3.2 — Smoother finish for food or pharmaceutical applications to prevent bacterial growth. Smoother finish for food or pharmaceutical applications to prevent bacterial growth.ASME B46.1
Temperature rating	-20–200 °C	-20 to 200 — Higher temperature may require derating of pressure and material selection. Higher temperature may require derating of pressure and material selection. Outside this range: Above 200°C may cause material degradation, seal failure, or pressure rating reduction. Below -20°C may cause brittleness in carbon steel.ASME B31.1
Duty cycle	Continuous or intermittent	Continuous or intermittent — Continuous duty requires better heat dissipation and material fatigue resistance. Continuous duty requires better heat dissipation and material fatigue resistance.
Service life	10 - 20 years	10 - 20 — Depends on material, environment, and maintenance. Depends on material, environment, and maintenance.
Ambient environment	Indoor/outdoor, washdown or corrosive atmosphere	Indoor/outdoor, washdown or corrosive atmosphere — Outside this window: Corrosive atmosphere without proper material selection leads to pitting and premature failure. Washdown requires IP65 rating for electrical components if present. Outside this window: Corrosive atmosphere without proper material selection leads to pitting and premature failure. Washdown requires IP65 rating for electrical components if present.

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

Header Body
Main fluid distribution chamber

Material: Stainless Steel
Inlet Connection Part
Fluid entry point from supply line

Material: Stainless Steel
Outlet Ports Part
Connection points for spray nozzles

Material: Stainless Steel
Mounting Brackets Part
Secure header to supporting structure

Material: Carbon Steel

Applied To / Applications

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

Cooling Spray System

View system integration details

Manufacturers of Spray Headers

Manufacturer profiles associated with Spray Headers.

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Frequently Asked Questions

What are the typical inlet connection sizes for spray headers?

Inlet connection sizes typically range from 1/2" to 4" NPT or BSP, as per ASME B1.20.1. The size should match the existing piping system.

How many outlet ports can a spray header have?

The number of outlet ports typically ranges from 2 to 24, depending on the required spray coverage area and nozzle spacing. Port spacing can vary from 50 to 300 mm.

What materials are commonly used for spray headers?

Common materials include stainless steel 304/316/316L, carbon steel, and brass. Stainless steel 316L is suitable for corrosive or high-temperature fluids, carbon steel for cost-sensitive applications, and brass for low-pressure water.

What standards apply to spray headers?

Relevant standards include ASME B31.1 for pressure piping, ASME B16.5 for flanges, ASME B1.20.1 for threads, ASTM A312/A53/B16 for materials, ASME B36.10M for wall thickness, and ASME B46.1 for surface finish. Always verify compliance with the manufacturer.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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