Manhole/Access Hatch: Temperature Range -40°C to 200°C

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

Parameter	Typical range	Notes & selection driver
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

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 14122-3, DIN 28036, ASME BPV Code Section VIII

Parent Products

This component is used in the following industrial products

Chemical Storage Tanks

Industrial chemical storage tanks for feedstocks and process liquids, with material selection matched to chemistry, temperature and pressure.

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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

Typical Suppliers & Equivalents

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

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Manhole/Access Hatch

Manufacturer profiles associated with Manhole/Access Hatch.

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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.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

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.

Manhole/Access Hatch