Ventilations / Fans
Air Ducting for Gas Freeing Fans
Air Ducting for Gas Freeing Fans is a group of 10 IMPA-coded items (codes 591515–591528) under Ventilations / Fans in the Pneumatic & Electrical Tools section (IMPA 59). All of them are priced per lgh. The list runs through 2 metric sizes from 300 mm to 400 mm.
Buying guide
This is the flexible ducting that carries air from a portable gas-freeing fan into a tank, hold or other enclosed space, or draws foul air out of it. The group lists it in 300 mm and 400 mm diameter, in 10, 15, 20, 25 and 30 m lengths.
It is used with the air-driven, water-driven and electric fans in the neighbouring groups. The job is ventilating spaces before and during entry, after tank cleaning, and for hot work. The chief officer or chief engineer raises it when a duct is torn, crushed or lost overboard, or when a longer run is needed to reach the bottom of a space.
How to specify it
Give the diameter to match the fan’s outlet or inlet spigot (300 or 400 mm), the length, and the fan it will be used on. Say whether the duct will blow air in (supply) or draw air out (exhaust), and where the fan will be used, so the supplier offers a duct suitable for that duty.
Choose the length to reach the lowest part of the space from where the fan stands. A duct that ends near the hatch leaves pockets of bad air below. COSWP requires the space to be ventilated thoroughly so that no oxygen-deficient pockets remain.[1]
Rules and certificates
COSWP, preparing a space for entry: ventilate it thoroughly, preferably by mechanical means, then test the atmosphere to confirm harmful gases are gone. Discharge the vented gases away from the entry point and from other spaces. Never use compressed oxygen to ventilate.[1]
During entry, ventilation should continue while the space is occupied and during breaks. If the ventilation fails, everyone in the space should leave at once. The atmosphere is retested periodically and the results recorded.[1]
Questions buyers ask
- Does ventilating a tank with a fan mean we can skip the gas test?
- No. COSWP asks for the space to be ventilated and then tested before entry, and tested periodically while people are inside. Ventilation and testing go together.
- 300 mm or 400 mm duct?
- Whichever matches the fan’s spigot. The duct has to fit the fan it is used with; the catalogue lists both sizes in 10 to 30 m lengths.
Published by Sherif Awad, founder of GeoMarineHub — in ship supply since 1990, a family business since 1981 (45 years). Last checked .
At a glance
Part of Pneumatic & Electrical Tools (IMPA section 59): Power tools — drills, grinders, deck scalers, needle guns, impact wrenches and their consumables.
It is one of 20 groups under Ventilations / Fans; the others include Air Driven Gas Freeing Fans, Air Movers Portable, Air Supply Hose - Black for Gas Freeing Fan, Blowers Deck Mount, Gas Freeing Fan Trolley and 14 more.
Post the ones you need as a requirement and verified suppliers activated at your port bid on them — sealed, so nobody sees another bid.
- Items
- 10
- IMPA codes
- 591515–591528
- Priced
- per lgh
- Sizes
- 300 mm – 400 mm
Items
Also under Ventilations / Fans
- Air Driven Gas Freeing Fans
- Air Movers Portable
- Air Supply Hose - Black for Gas Freeing Fan
- Blowers Deck Mount
- Gas Freeing Fan Trolley
- Gas Freeing Fans Air Driven
- Gas Freeing Fans Portable
- Gas Freeing Fans Water Driven
- Gas Freeing Fans Water Driven Portable
- Jet Fan Air Movers
- Layflat Hoses for Gas Freeing Fans
- Portable Electric Industrial Fan Heaters
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