INDUSTRY COMPONENT

Manhole/Access Hatch

A sealed access point on chemical storage tanks for inspection, cleaning, and maintenance.

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Component Specifications

Definition
A manhole or access hatch is a critical safety and maintenance component installed on chemical storage tanks, designed to provide secure, leak-proof entry for personnel, equipment, or tools. It typically consists of a removable cover, a sealing gasket, and a bolted or clamped flange assembly that maintains tank integrity under operational pressures and chemical exposures. These hatches are engineered to withstand corrosive environments, pressure differentials, and temperature variations while ensuring compliance with industrial safety standards.
Working Principle
The manhole operates by creating a pressure-tight seal between the tank and the removable cover using a gasket and bolting mechanism. When closed, it maintains the tank's containment integrity; when opened, it allows safe access for inspection, cleaning, or emergency intervention without compromising structural safety.
Materials
Stainless steel (AISI 316L, 304), carbon steel with epoxy/phenolic coatings, fiberglass-reinforced plastic (FRP), or Hastelloy for highly corrosive chemicals. Gaskets: PTFE, Viton, EPDM, or silicone.
Technical Parameters
  • Diameter 400mm to 600mm standard
  • Seal Type Double-bolted with safety lock
  • Cover Thickness 6mm to 12mm
  • Flange Standard ANSI/ASME B16.5
  • Pressure Rating Up to 10 bar
  • Temperature Range -40°C to 200°C
Standards
ISO 14122-3, DIN 28036, ASME BPV Code Section VIII

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Manhole/Access Hatch.

chemical tank manhole access hatch industrial hatch tank inspection port pressure vessel access safety manhole maintenance hatch corrosion-resistant hatch Manhole/Access Hatch Manhole/Access Hatch in Chemical Manufacturing

Parent Products

This component is used in the following industrial products

Chemical Storage Tanks

Specialized containers designed for the safe storage of chemicals within an industrial neutralization system.

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Recovery Tank

A vessel designed to collect, store, and temporarily hold recovered fluids or materials within a drainage and recovery system.

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Engineering Analysis

Risks & Mitigation
  • Chemical leakage
  • Pressure buildup
  • Corrosion failure
  • Unauthorized access
  • Gasket degradation
FMEA Triads
Trigger: Gasket deterioration due to chemical attack
Failure: Seal leakage leading to chemical spill
Mitigation: Regular inspection and replacement with chemical-resistant gaskets (e.g., PTFE)
Trigger: Corrosion of bolting components
Failure: Structural weakness and potential cover detachment
Mitigation: Use corrosion-resistant materials and apply protective coatings
Trigger: Improper closure or over-torquing
Failure: Seal distortion or bolt failure
Mitigation: Follow torque specifications and use calibrated tools

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±0.5mm on flange flatness, seal compression within 15-20% of gasket thickness
Test Method
Hydrostatic pressure test at 1.5x operating pressure, helium leak test for critical applications

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 primary safety feature of a chemical tank manhole?

Pressure-rated, leak-proof sealing with lockable bolts to prevent accidental opening during tank operation.

How often should manhole gaskets be replaced?

Typically every 1-2 years or after any maintenance opening, depending on chemical exposure and inspection results.

Can manholes be customized for specific chemicals?

Yes, materials and seals are selected based on chemical compatibility, temperature, and pressure requirements.

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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