Upper Head for Filter Vessels | Component Specifications

Product Specifications

Technical details and manufacturing context for Upper Head

Definition

The Upper Head is a critical pressure-retaining component located at the top of a filter vessel. It serves as the primary closure mechanism for the vessel's upper opening, providing structural integrity and containment for the filtration process. This component typically includes openings for inlet connections, inspection ports, pressure relief devices, and other process interfaces required for filter operation and maintenance. The Upper Head is designed to withstand internal pressure and external loads, ensuring a leak-tight seal under operating conditions. It is manufactured from materials such as Stainless Steel 316L or Carbon Steel, with design parameters that must be verified for each specific application. Key parameters include design pressure (1.0–1.6 MPa per GB/T 150), design temperature (-40–150 °C per GB/T 150), inner diameter (300–3000 mm), wall thickness (6–60 mm), surface roughness (Ra 0.8–3.2 μm), material grade (304/316L per ASTM A240), head height (75–750 mm), straight flange length (25–50 mm per ASME), weight (10–500 kg), tolerance on diameter (±0.5% per GB/T 25198), tolerance on thickness (+0.5/-0.2 mm per GB/T 25198), and hydrostatic test pressure (1.25× design pressure per GB/T 150). These values are reference ranges; the actual values must be confirmed with the legal manufacturer or supplier for the intended model and application. The Upper Head is a component used in machinery and equipment manufacturing, specifically in filter vessels. It is not a standalone product but part of a larger system. For procurement, verify that the component meets the required standards and specifications for your process conditions.

Working Principle

The Upper Head functions as a pressure boundary that contains the internal pressure and media within the filter vessel. It distributes mechanical loads from internal pressure and external connections across the vessel structure. During operation, it maintains a sealed environment while allowing controlled access for media input, venting, and monitoring through integrated ports and connections. The head's geometry and material thickness are designed to resist deformation and failure under specified pressure and temperature conditions. It also provides attachment points for piping, instruments, and other components, ensuring proper alignment and support. The sealing mechanism, typically a gasket or O-ring, is compressed between the head and the vessel flange to prevent leakage. The head must be inspected regularly for signs of corrosion, cracking, or deformation, and any damage should be addressed promptly to maintain safety and performance.

Common Materials

Stainless Steel 316L, Carbon Steel

Technical Parameters

Parameter	Typical range	Notes & selection driver
Design Pressure	1.0–1.6 MPa	Exceeding this range requires special designGB/T 150
Design Temperature	-40–150 °C	Below -40°C requires low-temp steelGB/T 150
Inner Diameter	300–3000 mm	Custom sizes available
Wall Thickness	6–60 mm	Depends on pressure and diameter
Surface Roughness	Ra 0.8–3.2 μm	Lower for sanitary applications
Material Grade	304/316L	Other alloys on requestASTM A240
Head Height	75–750 mm	Includes straight flange
Straight Flange Length	25–50 mm	Standard per ASME
Weight	10–500 kg	Approx. per piece
Tolerance on Diameter	±0.5%	Tighter on requestGB/T 25198
Tolerance on Thickness	+0.5/-0.2 mm	Per plate toleranceGB/T 25198
Hydrostatic Test Pressure	1.25× design pressure	Minimum 30 min holdGB/T 150

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

Flange Connection Part
Provides mating surface for vessel shell connection

Material: Stainless Steel
Inlet Nozzle Part
Entry point for unfiltered media into the vessel

Material: Stainless Steel
Manway
Access opening for inspection and maintenance

Material: Carbon Steel
Pressure Relief Valve Port Part
Mounting interface for safety pressure relief device

Material: Stainless Steel
Head Closure
The dished plate itself — it is the pressure boundary all the ports are cut into.
Gasket / O-Ring
Compressed between head and vessel flange; it is what actually stops the leak.

Applied To / Applications

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

Filter Vessel

View system integration details

Manufacturers of Upper Head

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Frequently Asked Questions

What materials are available for the Upper Head?

The Upper Head can be made from Stainless Steel 316L or Carbon Steel, as listed in the product data. Other alloys may be available on request, but this must be confirmed with the supplier.

What is the design pressure range for the Upper Head?

The design pressure range is 1.0–1.6 MPa, per GB/T 150. Exceeding this range requires special design. Always verify the actual design pressure for your specific application with the manufacturer.

What standards apply to the Upper Head?

Relevant standards include GB/T 150 for pressure and temperature, GB/T 25198 for tolerances, and ASTM A240 for material grade. These are reference standards; compliance must be confirmed with the supplier.

How should the Upper Head be inspected?

Regular inspection for corrosion, cracking, or deformation is recommended. Hydrostatic testing at 1.25× design pressure is specified per GB/T 150. Always follow the manufacturer's maintenance guidelines.

Data Basis

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

Preliminary Technical Classification

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pressure:	Up to 150 psi (standard), 300 psi with reinforced design
other spec:	Flow rate: 0-500 GPM, Slurry concentration: ≤40% solids by weight
temperature:	-20°C to 150°C (standard elastomers), up to 300°C with specialized gaskets

Upper Head

Product Specifications

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards