Recently, we have read and hearing reports from mobile offshore boring gear owners that a variety of Methods are mosting likely to be piled– sadly, this is a cycle that we have actually been through before. From past experience, we have learned that Lay Up Malaysia gears with correct dehumidification equipment installed aids to maintain the stability of the listed below deck equipment and the quarters. When it comes time for the gear to be reactivated, it looks to the right faster and in much better problem than a gear that is chilly stacked at dockside or in the middle of a bay.
Iron starts to dramatically rust (corrosion) at 60% RH as well as above (Garverick, Rust in the Petrochemical Sector). According to the American Bureau of Delivery, for the best cause protecting below deck tools as well as machinery areas, they recommend “total dehumidification at 35% to 45% RH … to avoid sweating or moisture rust damages”. Holding a family member humidity of 40% to 75% will protect the honesty of seals and gaskets. Provided all these aspects, we generally recommend around 45% RH for gear layups.
Desiccant Wheel DH Units
Refrigerant DH Units
Desiccant Wheel DH Units are made use of by the US Naval Reserve Fleet and also are the “gold requirement” for Lay Up Malaysia due to the fact that they are not detrimentally affected by low ambient air temperatures like Refrigerant DH Units.
HOW IT FUNCTIONS
The Desiccant Wheel DH Unit uses a rotating, regenerative, open fluted matrix wheel that is fertilized with a hygroscopic, safe aspect. A humidistat keeps an eye on the relative moisture in the room and transforms the DH System on or off to achieve and maintain the desired humidity set point. The humidistat can be developed right into some DH Units at the return air inlet, which is where the air is mosting likely to be one of the most humid.
Dry air is larger than damp air, so the completely dry air will displace the moist air and push the damp air back to the DH System, which is mounted in the dehumidified space. Dry air will also look for areas where there is even more humid air. So hard-to-reach locations, crawl spaces, storage tanks, and also spaces that are permitted to be usual to the location being evaporated will additionally be dried as well as correctly maintained.
Normally, we advise one dehumidifier for all the below deck equipment spaces and one dehumidifier for the quarters– the exact same method puts on both rooms. Dehumidifying the machinery rooms listed below deck is noticeable. Nonetheless, it is also a great concept to evaporate the living quarters if the rig is not mosting likely to be inhabited throughout lay-up. Evaporating the quarters prevents mold and mildew and also mildew from growing in the encased quarters– all the bedding remains great as well as completely dry and also the overhanging ducting as well as structure does not rust.
There are also a number of semi-submersibles with DH Units in the caissons as well as pontoons, which must be made use of for conservation of these areas in the event of a lay-up.
To identify the proper dimension of the dehumidifier, we would determine the gross quantity of the location to be dried and after that figure that the DH Unit will certainly turn that gross quantity over every 4 to 6 hrs on a stacked rig. This typically turns out to be a little DH Unit such as a 600 CFM or 1200 CFM size unit.
With a Desiccant Wheel DH System, we prolong flex duct that handles the dry supply air to the farthest point away from the DH location. Then, the return air flows back to the DH Device via all the open doors. The reactivation air consumption as well as exhaust requires to be ducted from outside the dehumidified space to avoid ambient, humid air leaks. Affordable, protected flexible duct can be utilized.
You can also utilize really small DH Units (60 CFM) to evaporate isolated areas such as crane taxis and also drillers/dog homes. Usually small Refrigerant DH Units are utilized in these locations and only a drainpipe line requires to be run outside of the location.
Usually, rig hands and rig electricians are greater than capable of setting up a dehumidification system on a gear Lay Up Malaysia, which eliminates the costly need to work with an outdoors service provider for this work
BE PREPARED TO PROGRESS
No person suches as to think of rig lay-ups. That is not what this power industry is everything about. We want full steam forward. Not turn around. Not quit. But a gear that is effectively maintained as well as dehumidified will survive being briefly out of action and also will have the ability to go back to operation faster than one that is not.
Should the need develop to pile a rig, contact Eldridge and we will certainly assist you with dehumidifier application, sizing, and flex duct/fitting directing format as a worth included service.
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