Lately, we have actually been reading and also hearing reports from mobile offshore boring rig owners that a number of Methods are going to be stacked– sadly, this is a cycle that we have actually been through in the past. From past experience, we have discovered that laying up rigs with correct dehumidification equipment mounted 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 resorts to the ideal faster as well as in better problem than a gear that is cool piled at Ship Layup Labuan or in the middle of a bay.
Iron begins to significantly wear away (corrosion) at 60% RH and over (Garverick, Deterioration in the Petrochemical Sector). According to the American Bureau of Shipping, for the best lead to maintaining listed below deck tools and equipment rooms, they recommend “full dehumidification at 35% to 45% RH … to prevent sweating or moisture rust damage”. Holding a relative humidity of 40% to 75% will preserve the honesty of seals and gaskets. Provided all these aspects, we normally recommend around 45% RH for rig layups.
Desiccant Wheel DH Units
Cooling Agent DH Units
Desiccant Wheel DH Units are made use of by the US Naval Reserve Fleet as well as are the “gold criterion” for lay-ups due to the fact that they are not adversely influenced by low ambient air temperatures like Cooling agent DH Units.
HOW IT FUNCTIONS
The Desiccant Wheel DH System uses a rotating, regenerative, open fluted matrix wheel that is impregnated with a hygroscopic, safe aspect. A humidistat checks the family member humidity in the space and also transforms the DH Unit on or off to achieve as well as maintain the wanted moisture set factor. The humidistat can be constructed into some DH Units at the return air inlet, which is where the air is going to be the most damp.
Dry air is much heavier than damp air, so the completely dry air will displace the moist air and also press the damp air back to the DH Device, which is mounted in the dehumidified area. Dry air will certainly likewise seek out areas where there is more damp air. So hard-to-reach areas, crawl spaces, containers, and spaces that are allowed to be common to the location being dehumidified will certainly also be dried out and also appropriately protected.
Typically, we recommend one dehumidifier for all the listed below deck machinery spaces and one dehumidifier for the quarters– the very same technique relates to both areas. Evaporating the equipment rooms below deck is evident. Nevertheless, it is likewise an excellent idea to evaporate the living quarters if the gear is not mosting likely to be lived in throughout lay-up. Dehumidifying the quarters stops mold as well as mold from expanding in the enclosed quarters– all the bedding remains great and dry and also the overhead ducting and framework does not rust.
There are additionally a variety of semi-submersibles with DH Units in the caissons and pontoons, which must be made use of for conservation of these locations in case of a lay-up.
To determine the proper size of the dehumidifier, we would calculate the gross quantity of the area to be dried and after that figure that the DH Device will transform that gross quantity over every 4 to 6 hours on a stacked rig. This generally ends up being a small DH Device such as a 600 CFM or 1200 CFM size unit.
With a Desiccant Wheel DH Device, we extend flex air duct that manages the completely dry supply air to the farthest point far from the DH area. After that, the return air circulates back to the DH Device via all the open doors. The resurgence air consumption and exhaust needs to be ducted from outside the dehumidified room to stop ambient, moist air leakages. Low cost, shielded adaptable duct can be made use of.
You can also utilize really little DH Units (60 CFM) to evaporate separated locations such as crane cabs as well as drillers/dog homes. Usually small Cooling agent DH Units are utilized in these areas as well as only a drainpipe line needs to be run outside of the area.
Typically, rig hands as well as gear electrical contractors are greater than efficient in setting up a dehumidification system on a gear Ship Layup Labuan, which removes the pricey requirement to employ an outside specialist for this job
BE PREPARED TO PROGRESS
No person suches as to think of gear Ship Layup Labuan. That is not what this energy market is all about. We desire top speed onward. Not reverse. Not stop. Yet a rig that is appropriately preserved and also evaporated will endure being temporarily out of action and will be able to go back to procedure faster than one that is not.
Must the demand arise to stack a rig, call Eldridge and also we will certainly aid you with dehumidifier application, sizing, and also flex duct/fitting routing design as a value added solution.
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