INDUSTRY COMPONENT

Lower Head

The lower head is the bottom closure component of a filter vessel, designed to withstand internal pressure and facilitate fluid discharge.

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Component Specifications

Definition
The lower head is a critical pressure-retaining component that forms the bottom enclosure of a filter vessel. It is engineered to contain process fluids under pressure while providing structural integrity to the vessel assembly. Typically hemispherical, elliptical, or torispherical in shape, it connects to the cylindrical shell via a welded joint and often includes outlet nozzles, drain ports, or support attachments. Its design must account for pressure loads, thermal stresses, corrosion resistance, and compatibility with filtration media.
Working Principle
The lower head functions as a pressure boundary that seals the bottom of the filter vessel. During operation, it withstands internal pressure from the filtration process, directs filtered fluid toward discharge outlets, and supports internal components like filter elements or baskets. Its curved geometry distributes stress evenly to prevent failure under cyclic loading.
Materials
Carbon steel (ASTM A516 Gr.70), stainless steel (ASTM A240 316/316L), duplex stainless steel (UNS S32205), nickel alloys (Hastelloy C-276), or fiber-reinforced polymers. Material selection depends on corrosion resistance, pressure rating, and temperature requirements.
Technical Parameters
  • Head Type Hemispherical/Elliptical (2:1 ratio)
  • Surface Finish Ra ≤ 0.8 μm for sanitary applications
  • Design Pressure Up to 150 psi (10.3 bar)
  • Thickness Range 6-50 mm
  • Design Temperature -20°C to 200°C
  • Connection Standard ASME B16.5 flanges
Standards
ISO 9095, DIN 28011, ASME BPVC Section VIII

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Lower Head.

filter vessel lower head pressure vessel bottom head industrial filtration components ASME head design stainless steel vessel head Lower Head Lower Head in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Filter Vessel

The pressure vessel housing the filter media in a multi-media filtration system.

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Engineering Analysis

Risks & Mitigation
  • Stress corrosion cracking
  • Fatigue failure from pressure cycles
  • Improper weld leading to leakage
  • Material incompatibility with process fluids
FMEA Triads
Trigger: Corrosive fluid exposure
Failure: Wall thinning and perforation
Mitigation: Use corrosion-resistant materials, apply protective coatings, implement thickness monitoring
Trigger: Cyclic pressure loading
Failure: Fatigue cracks at stress concentration points
Mitigation: Design with smooth transitions, perform fatigue analysis, use forged rather than fabricated heads
Trigger: Improper installation
Failure: Misalignment causing uneven stress distribution
Mitigation: Follow ASME alignment tolerances, use precision jigs during welding, conduct post-weld heat treatment

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±1.5 mm on diameter, ±0.5° on angular alignment
Test Method
Hydrostatic pressure test at 1.5x design pressure, liquid penetrant testing (PT) for welds, ultrasonic thickness measurement

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What are the common shapes for filter vessel lower heads?

Hemispherical (best pressure distribution), elliptical (standard for most applications), and torispherical (cost-effective for moderate pressure).

How is the lower head attached to the filter vessel?

Typically welded to the cylindrical shell using full-penetration welds per ASME standards, with possible flanged connections for removable designs.

What maintenance does the lower head require?

Regular inspection for corrosion, weld integrity checks, and cleaning of internal surfaces to prevent contamination or buildup.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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