GB 3887 Type D Marine Mushroom Ventilator | Large Diameter Marine Ventilation

Product Specification

GB 3887 Type D Marine Mushroom Ventilator | Large Diameter Marine Ventilation Equipment

Product Overview

The GB 3887 Type D marine mushroom ventilator is a large-diameter weather deck ventilation fitting designed for ventilation of larger ship spaces. It is normally installed above freeboard deck position 2 and can be arranged for natural ventilation or connected with a fan through flange connection when mechanical ventilation is required.

The mushroom-shaped cover protects the ventilation opening while the stainless mesh helps prevent rats, insects, and foreign objects from entering the ventilated space. This page is prepared according to the supplied GB 3887-83 Type D data. Final installation position, weather-tight requirements, fan flange details, material selection, coating system, and class approval scope should be confirmed according to vessel drawings and project requirements.

Public marine equipment references also describe GB 3887 Type D mushroom ventilators as large marine ventilation fittings with natural ventilation applications, optional customization, stainless mesh protection, and marine surface treatment options. citeturn0search2turn0search3

Quick Specifications

• Product type: Type D marine mushroom ventilator → large-diameter ventilation fitting for ship weather deck spaces.
• Standard: GB 3887-83 according to supplied data → applicable standard edition should be confirmed for new projects.
• Nominal size range: DN400 to DN1200 → designed for larger ventilation openings and larger internal spaces.
• Ventilation mode: Natural ventilation; fan connection possible through flange connection → fan interface details require drawing confirmation.
• Materials: Mild steel, stainless steel, bronze, copper → select according to corrosion environment and project specification.
• Mesh protection: Stainless mesh → helps prevent rats, insects, and foreign objects entering ventilated spaces.
• Surface treatment: Sa 2.5 blasting + epoxy shop primer reference, galvanized or polished options available → final finish follows vessel requirement.
• Classification: CCS, NK, BV, ABS, DNV, LR, KR, IRS, RS and other inspection scope available according to project requirement.

Main Technical Parameters

Selection & Inquiry Guide

Step 1: Confirm GB 3887 Type D mushroom ventilator and nominal diameter DN400 to DN1200 according to ventilation calculation and vessel arrangement.

Step 2: Confirm natural ventilation or mechanical ventilation requirement, including fan flange connection, fan size, and connection detail if applicable.

Step 3: Confirm installation location: freeboard deck position, weather exposure, opening arrangement, drainage requirement, and surrounding deck clearance.

Step 4: Confirm material requirement: mild steel, stainless steel, bronze, copper, or special corrosion-resistant material according to service environment.

Step 5: Confirm mesh, cover arrangement, surface treatment, coating system, galvanized or polished finish requirement.

Step 6: Confirm class inspection scope, material certificate, maker certificate, quantity, destination, and delivery time.

Structure

Mushroom cover | Ventilation body | Deck mounting flange | Air passage opening | Stainless mesh screen | Fan connection flange when specified | Weather protection arrangement | Marine coating system

Ventilation, Protection & Engineering Advantages

• The mushroom cover design helps protect the ventilation opening from direct weather exposure while maintaining airflow.
• The large Type D diameter range is suitable for ventilation of larger ship spaces where higher air passage area is required.
• Stainless mesh protection reduces the risk of rats, insects, and foreign objects entering the ventilated compartment.
• Natural ventilation or mechanical ventilation connection should be selected according to the vessel ventilation design and approved arrangement.
• Material selection is important because the ventilator is exposed to marine atmosphere, salt spray, and weather conditions.
• Installation should consider deck penetration, welding or mounting detail, drainage, coating repair, and class inspection requirement.

Custom Attributes

• Standard: GB 3887-83 according to supplied data → confirm latest project standard before release.
• Type: Type D → large diameter mushroom ventilator.
• Nominal Diameter: DN400-1200 → select according to ventilation requirement and vessel layout.
• Material: Mild steel / stainless steel / bronze / copper → final material depends on corrosion environment and customer requirement.
• Ventilation Mode: Natural ventilation or fan connection → fan flange details to be confirmed.
• Mesh Protection: Stainless mesh → insect and foreign-object protection.
• Surface Treatment: Blasting, epoxy primer, galvanized, polished, or customized finish.
• Certificate Requirement: Available according to project scope → class approval and inspection requirement should be confirmed.

How It Works

Air enters through the mushroom ventilator opening → Stainless mesh prevents foreign-object entry → Ventilation air passes into ship spaces → Fan connection can provide mechanical ventilation when arranged → Weather protection and coating maintain marine service performance

Applications

Cargo vessels | Tankers | Passenger ships | Gas carriers | Large ship compartments | Engine room auxiliary spaces | Weather deck ventilation systems | Newbuilding and replacement projects

Certifications & Advantages

Certificates can be arranged according to project requirement, inspection scope, material traceability, and classification society approval procedure.

Certification: CCS, NK, BV, ABS, DNV, LR, KR, IRS, RS, RINA, CRS, Makers Test Certificate.

Drawing & Photos

FAQ

Q1: Is GB 3887 Type D only for natural ventilation?

A1: No. The supplied data states natural ventilation use and also allows fan connection by flange when mechanical ventilation is required. The fan interface should be confirmed by drawing.

Q2: Why is stainless mesh installed?

A2: Stainless mesh helps prevent rats, insects, and foreign objects entering the ventilated space while allowing airflow through the ventilator.

Q3: What information is needed before quotation?

A3: Confirm DN size, installation position, ventilation requirement, fan flange requirement if any, material, surface treatment, certificate scope, quantity, vessel type, and delivery requirement.