Manhole/Cleaning Port for Liquid Storage Tanks

Product Specifications

Technical details and manufacturing context for Manhole/Cleaning Port

Definition

A manhole/cleaning port is a critical safety and maintenance component of liquid storage tanks that provides personnel access to the tank interior for inspection, cleaning, repair, and emergency response. It typically consists of a reinforced opening with a removable cover or door that can be securely sealed to maintain tank integrity and prevent leaks or contamination. This component is used in fabricated metal product manufacturing, particularly for tanks in industries such as chemical processing, water treatment, and food and beverage. The manhole/cleaning port is designed to withstand the operating conditions of the tank, including pressure and temperature, while ensuring a tight seal to prevent leakage. It is available in various materials, including stainless steel, carbon steel, and fiberglass reinforced plastic, to suit different media and environmental conditions. Key parameters include nominal diameter (450–600 mm), operating pressure (1.0–1.6 MPa), design temperature (-40–85 °C), leakage rate (0.01–0.1 cm³/min), material grade (304–316L), flange thickness (16–30 mm), bolt hole diameter (18–26 mm), surface roughness (0.8–3.2 μm), and weight (15–45 kg). These values are reference ranges and must be verified for the specific model and application. The component is manufactured according to standards such as GB/T 150, ASTM A240, and GB/T 9112, which serve as procurement and verification references. It is essential to confirm compliance with applicable standards and regulations with the legal manufacturer or supplier before installation. Proper selection and installation are crucial for safe operation, and regular inspection and maintenance are necessary to ensure the integrity of the tank and the safety of personnel.

Working Principle

The manhole/cleaning port functions as a sealed access point that can be opened when needed for tank entry or cleaning equipment insertion, then securely closed and sealed to maintain the tank's containment integrity, pressure rating (if applicable), and prevent environmental contamination. The cover or door is typically secured with bolts or clamps, and a gasket or seal ensures a leak-tight closure. When closed, the port maintains the tank's pressure boundary and prevents the escape of contents or ingress of external contaminants. When opened, it provides a safe and convenient entry point for personnel and equipment, facilitating inspection, cleaning, and maintenance operations. The design must account for the tank's operating pressure and temperature, as well as the nature of the stored liquid, to ensure safe and reliable performance.

Common Materials

Stainless Steel, Carbon Steel, Fiberglass Reinforced Plastic

Technical Parameters

Parameter	Typical range	Notes & selection driver
Nominal Diameter	450–600 mm	Standard sizes for personnel access.
Operating Pressure	1.0–1.6 MPa
Design Temperature	-40–85 °C	Beyond this range, material properties degrade.GB/T 150
Leakage Rate	0.01–0.1 cm³/min
Material Grade	304–316L ASTM	316L for corrosive media.ASTM A240
Flange Thickness	16–30 mm	Thicker for higher pressure ratings.GB/T 9112
Bolt Hole Diameter	18–26 mm	Matches standard bolt sizes.GB/T 9112
Surface Roughness	0.8–3.2 μm	Smoother for sanitary applications.GB/T 1031
Weight	15–45 kg	Depends on size and pressure class.

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

Cover/Flange Part
Seals the opening and provides mounting surface

Material: steel
Gasket/Seal Part
Creates leak-proof seal between cover and tank

Material: rubber or synthetic polymer
Bolts/Clamps Part
Secures the cover in place

Material: steel
Hinge (if applicable) Optional Part
Allows cover to swing open while remaining attached

Material: steel

Applied To / Applications

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

Liquid Storage Tank

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Admixture Storage Tank

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Manufacturers of Manhole/Cleaning Port

Manufacturer profiles associated with Manhole/Cleaning Port.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 16 September 2026

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

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Inspection readiness

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Frequently Asked Questions

What is the purpose of a manhole/cleaning port?

It provides personnel access to the interior of a liquid storage tank for inspection, cleaning, repair, and emergency response, while maintaining a sealed closure when not in use.

What materials are available for manhole/cleaning ports?

Common materials include stainless steel, carbon steel, and fiberglass reinforced plastic. The choice depends on the stored media, environmental conditions, and required corrosion resistance.

What standards apply to manhole/cleaning ports?

Relevant standards include standards for leakage and pressure testing, GB/T 150 for pressure vessels, ASTM A240 for stainless steel plates, and GB/T 9112 for flanges. Always verify compliance with the manufacturer.

How do I select the correct manhole/cleaning port for my tank?

Consider the tank's operating pressure, temperature, and the nature of the liquid. Verify the nominal diameter, material grade, and other parameters against your requirements, and consult the manufacturer for model-specific data.

Data Basis

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

Preliminary Technical Classification

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pressure:	Atmospheric to 1.5 bar (standard), up to 10 bar with reinforced design
other spec:	Slurry concentration: Up to 40% solids by weight, Flow rate: N/A (static access port)
temperature:	-20°C to 120°C (standard), up to 200°C with special seals

Manhole/Cleaning Port

Product Specifications

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards