INDUSTRY COMPONENT

Manway

A manway is a large access opening in a reflux drum for inspection, cleaning, and maintenance.

Component Specifications

Definition
A manway is a standardized, flanged opening installed on pressure vessels like reflux drums, designed to allow personnel entry for internal inspection, cleaning, maintenance, and repair. It typically consists of a reinforced nozzle, a removable cover (blind flange or door), gasket, and bolting system, engineered to maintain pressure integrity and safety when closed.
Working Principle
The manway provides a sealed, pressure-tight access point. When closed, the cover compresses a gasket against the flange face via bolts, creating a leak-proof seal that withstands internal pressure and vacuum. When opened, it allows safe human entry following lockout/tagout and confined space procedures.
Materials
Carbon steel (ASTM A516 Gr. 70), stainless steel (ASTM A240 316/316L), clad steel, or alloy steel; compatible with process fluids; gaskets: spiral wound (stainless steel + graphite), rubber, or PTFE.
Technical Parameters
  • Size DN 500 to DN 600 (typical)
  • Bolting Stud bolts with nuts
  • Cover Type Blind flange or hinged door
  • Flange Standard ASME B16.5
  • Pressure Rating 150 psi to 300 psi (standard)
  • Temperature Range -20°C to 400°C
Standards
ASME BPVC Section VIII, API 650, ISO 28300

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Manway.

Parent Products

This component is used in the following industrial products

Engineering Analysis

Risks & Mitigation
  • Confined space hazards
  • Pressure release accidents
  • Gasket failure leading to leaks
  • Corrosion weakening integrity
FMEA Triads
Trigger: Improper bolting torque or sequence
Failure: Gasket leak under pressure
Mitigation: Follow ASME PCC-1 bolting procedures; use calibrated torque wrenches; inspect gaskets regularly.
Trigger: Corrosion from process fluids
Failure: Flange or cover degradation
Mitigation: Select corrosion-resistant materials; apply protective coatings; conduct thickness inspections.

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Flange flatness within 0.8 mm per ASME B16.5; bolt hole alignment within 1.6 mm.
Test Method
Hydrostatic pressure test per ASME BPVC Section VIII; pneumatic leak test with soap solution; visual and NDT inspection.

Buyer Feedback

★★★★☆ 4.8 / 5.0 (21 reviews)

"As a professional in the Chemical Manufacturing sector, I confirm this Manway meets all ISO standards."

"Standard OEM quality for Chemical Manufacturing applications. The Manway arrived with full certification."

"Great transparency on the Manway components. Essential for our Chemical Manufacturing supply chain."

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Frequently Asked Questions

What is the primary purpose of a manway on a reflux drum?

To allow safe personnel entry for internal inspection, cleaning, and maintenance while ensuring pressure integrity when sealed.

How is a manway sealed to prevent leaks?

Using a gasket compressed between the flange and cover by bolting, following ASME standards for pressure-tight joints.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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