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Lid / Manway Component – Chemical Manufacturing

Component Specifications

Definition

A lid or manway is a critical safety and access component on chemical storage tanks, designed to seal the tank opening to prevent leaks, contain pressure, and allow for inspection, cleaning, and maintenance. It typically consists of a cover, gasket, and fastening mechanism (e.g., bolts, clamps) to ensure a tight seal against chemical exposure and environmental factors.

Working Principle

The lid/manway operates by creating a pressure-tight seal using a gasket and fastening system, preventing chemical leakage and maintaining tank integrity. It may include safety features like pressure relief valves or locking mechanisms to control access.

Materials

Stainless steel (e.g., SS316L for corrosion resistance), carbon steel with coatings, or specialized alloys (e.g., Hastelloy, titanium) depending on chemical compatibility. Gaskets are often made from PTFE, EPDM, or Viton.

Technical Parameters

Weight 5kg to 50kg
Diameter 300mm to 1000mm
Seal Type Bolted or clamped
Pressure Rating Up to 10 bar
Temperature Range -40°C to 200°C

Standards

ISO 14122, ASME B16.5, DIN 28011

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Lid / Manway.

Parent Products

This component is used in the following industrial products

Chemical Storage Tank

A container designed for the safe storage of chemicals within a dosing system.

View Product Details

Engineering Analysis

Risks & Mitigation

Chemical leakage due to seal failure
Pressure buildup causing explosion
Corrosion from aggressive chemicals
Human error in improper closure

FMEA Triads

Trigger: Gasket degradation from chemical exposure
Failure: Leakage of hazardous chemicals
Mitigation: Use chemical-resistant gaskets and regular inspection

Trigger: Improper bolt tightening
Failure: Inadequate seal leading to pressure loss
Mitigation: Implement torque specifications and training

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance

Seal flatness within 0.1mm, bolt torque ±10%

Test Method

Pressure testing per ASME Section VIII, leak detection with helium or soap bubble test

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 is the difference between a lid and a manway?

A lid is a simple cover, while a manway includes a larger, accessible opening for personnel entry, often with safety features like handrails or ladders.

How often should a chemical tank lid be inspected?

Inspect every 6-12 months for corrosion, gasket wear, and seal integrity, or as per regulatory and operational guidelines.

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.

Lid / Manway