Marine Ventilator B300 CB∕T 4444-2017 (Indicating: Type B External Opening And Closing Ventilator With Nominal Diameter

CB∕T 4444-2017
Fungus-shaped ventilating tube for ships-Fungus-shaped ventilating cap for ships
MARINE MUSHROOM VENTILATORS
FH-B-TYPE External opening and closing ventilator
EXTERNAL OPENING AND CLOSING VENTILATOR
This standard replaces CB/T295-2000 marine mushroom-shaped ventilators, which are suitable for the design, manufacture and acceptance of ventilators installed on the open deck of marine ships.

Fungus-shaped ventilators for ships-B type external opening and closing fungus-shaped ventilators are usually marked as:

Marine ventilator B300 CB∕T 4444-2017 (indicating: Type B external opening and closing ventilator with nominal diameter DN=300)
Marine fungus-shaped ventilating tube B400 CB∕T 4444-2017 (indicating: Type B external opening and closing ventilating tube with nominal diameter DN=400)
B500 CB∕T 4444-2017 for marine external opening and closing fungus-shaped ventilating cap

About the technical agreement of marine CB∕T 4444-2017 marine mushroom ventilator-marine mushroom ventilator:

1. Marine ventilating tube-the surface of the marine fungus-shaped ventilating tube should be flat and smooth, without sharp edges, distortion, or skewing.
2. The diameter deviation of the air duct and the hood of the marine ventilating tube is ±3mm, and the verticality deviation is 2/h1000 (h is the height of the ventilating tube body)
3. The welding surface of the fungus-shaped ventilating head for ships shall be free of defects such as cracks, slag inclusions, burn-through, and non-fusion.
4. The weathertight cover of the marine fungus-shaped vent should be opened flexibly, and the movable part should be coated with neutral lubricating grease.
5. The inner and outer surfaces of the steel parts of marine mushroom-shaped vent caps should be derusted to Sa2 or St2 specified in GB/T8923, followed by two anti-rust primers.

About the test method of CB∕T 4444-2017 Marine Fungus Ventilator-Marine Fungus Vent Cap:
1. Flushing experiment of marine fungus-shaped ventilating tube:
Use a nozzle with a diameter of not less than 12.5, a water pressure of not less than 0.25Mpa, and a distance of no more than 1.5mm from the ventilating tube for flushing. The flushing time is 3min. The width of the indentation is not less than 0.5t (t is the thickness of the air cylinder) ".

2. Imprinting experiment of marine mushroom-shaped ventilating tube:
At the weathertight seal packing, apply white powder evenly, close the weathertight cover, then open it, and check the width of the indentation between the seal packing and the edge of the wind tube. The result should meet the requirements of 4.7.

3. Appearance inspection of B-type external open-close fungus-shaped ventilating tube for ship:
Visually inspect the appearance, and the result must meet the standard.

4. Dimension inspection of marine fungus-shaped ventilating tube:
Check the diameter and vertical deviation of the air duct and hood with a measuring tool, and the result should meet the requirements of 4.3.

Marine CB∕T 4444-2017 Marine external opening and closing fungus-shaped ventilating tube-marine fungus-shaped ventilating cap The selection table is as follows:

MUSHROOM VENTILATORS FOR SHIP

This standard CB/T295-2000 marine mushroom ventilator is suitable for the design, manufacture and acceptance of ventilators for installation on the open deck of marine vessels.

Marine mushroom ventilator - the form of marine mushroom ventilating cap is mainly divided into:

Technical agreement on marine CB/T295-2000 marine mushroom ventilator-marine mushroom ventilating cap:

1. Marine ventilator - The surface of the marine ventilating cylinder should be smooth and smooth without sharp edges, distortion and skew.
2. The diameter deviation of the air cylinder and the hood of the marine ventilator is ±3mm, and the deviation of the verticality is 2/h1000 (h is the height of the ventilating cylinder)
3. The welding surface of the marine mushroom-shaped ventilating head shall be free from cracks, slag inclusions, burn through, and unfused defects.
4. The weathertight cover of the marine mushroom-shaped ventilator should be flexible, and the active part should be coated with neutral grease.
5. The internal and external surfaces of the steel parts of the marine mushroom ventilating cap shall be derusted to the Sa2 or St2 level specified in GB/T8923, and then the second antirust primer.

Test method for CB/T295-2000 marine marine mushroom ventilator-marine mushroom ventilating cap:

1. Flushing experiment of marine mushroom-shaped ventilator:
Use a nozzle with a diameter of not less than 12.5, the water pressure is not less than 0.25Mpa, and then flush with the ventilator not exceeding 1.5mm. The flushing time is 3min. The result should be consistent with the "waterless beads in all parts, the sealing packing is in contact with the air cylinder. The width of the indentation is not less than 0.5t (t is the thickness of the cylinder body).

2. Imprint experiment of marine mushroom-shaped ventilator:
At the weathertight sealing packing, evenly apply white powder, close the weathertight cover, and then open it to check the width of the indentation of the sealing packing in contact with the edge of the air cylinder. The result should meet the requirements of 4.7.

3. Appearance inspection of marine mushroom ventilator:
The visual inspection was carried out by visual inspection, and the results were to comply with the standards.

4. Dimensional inspection of marine mushroom ventilator:
The gauge is used to check the diameter of the air duct and the hood, and the result should meet the requirements of 4.3.

Marine ventilator - mushroom ventilator is usually marked as:

Marine ventilator A300 CB/T295-2000 (indicate: Type A internal opening and closing ventilator with nominal diameter DN=300)
Marine mushroom ventilator B300 CB/T295-2000 (indicate: Type B external opening and closing ventilator with nominal diameter DN=300)

Marine mushroom-shaped ventilating cap C300 CB/T295-2000 (indicate: C-type internal opening and closing belt axial fan ventilator with nominal diameter DN=300)
Marine mushroom vent head D300 CB/T295-2000 (indicate: D type marine fixed ventilator with nominal diameter DN=300)

Yangzhou Feihang Ship Accessories Factory is a production enterprise specializing in marine pipe fittings, marine hydraulic valve parts and marine interior armored products.

The marine accessories produced by our company are complete in specifications, such as cast iron, cast steel, bronze and stainless steel, which are widely used in ships, oil and offshore platforms.

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