The volume of sea chest The volume of sea chest myvo (Mechanical) (OP) 14 Mar 16 08:32 Hello. Can you do me a favor? I want to know how to calculate the volume of sea chest? Can you show me please? Thank you very much and have a nice day. RE: The volume of sea chest IRstuff (Aerospace) 14 Mar 16 13:17 As in luggage? Is this for school? Student posting is not allowed TTFN I can do absolutely anything. I'm an expert! FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers RE: The volume of sea chest myvo (Mechanical) (OP) 14 Mar 16 15:36 I'm sorry. I graduated in 2014. Now I'm an engineer.and i dont have many experience. I have a trouble in volume of sea chest. I really need your help. Please! RE: The volume of sea chest Compositepro (Chemical) 14 Mar 16 17:31 IR, a sea chest is where a ship draws sea water from for whatever needs it has like cooling water of fire fighting. RE: The volume of sea chest IRstuff (Aerospace) 14 Mar 16 17:45 OK, so does the OP have drawings, dimensions, or what? TTFN I can do absolutely anything. I'm an expert! FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers RE: The volume of sea chest BUGGAR (Structural) 14 Mar 16 20:40 "a sea chest is where a ship draws sea water from for whatever needs it has like cooling water of fire fighting." There's part of you answer. Another part is what are your needs? I presume the sea chest acts as a reservoir to allow timed release for cooling or firefighting or whatever. Figger the time of need and the rate of use for that need and compute the volume from there, with a reserve. Like Civils do with detention/retention ponds. Or air receivers on compressors. Am I anywhere near understanding what you are talking about? Should there be rum involved? RE: The volume of sea chest MikeHalloran (Mechanical) 15 Mar 16 01:03 The sea chest is also where the engine cooling pumps draw their 'raw' water from. They are typically pretty big pumps. At the hull surface, the sea chest typically has some sort of grillage to keep out sea monsters and subsurface junk. At its upper end, the sea chest typically has a removable (often transparent) cover and a gasket. The top plane of the sea chest should be a little above the static waterline, so that one can stop the engines, stop the boat, remove the covers, and observe and hopefully remove whatever has clogged the inlet grillage, like seaweed, fishing line, fishing nets, scraps of canvas, body parts, whatever. The sea chest itself should be large enough to supply the raw water pumps for at least a few seconds while the hull surface grillage is temporarily obscured by something sliding along the hull surface while being run over, like an inflatable dinghy, or anything else you can imagine. I do not recall seeing a rule about this; it just seems like common sense. You should, however, double check the requirements, for instance by scanning the various Rules For Classing Ships, downloadable for free from eagle.org. Allow considerable time, and do use automated tools like the multiple file search function in Acrobat Reader; there is an awful lot of text to look at. As for the calculation itself, it should be as simple as cross sectional area x vertical dimension, roughly. Mike Halloran Pembroke Pines, FL, USA RE: The volume of sea chest chicopee (Mechanical) 16 Mar 16 01:26 I guess that a sea chest is anything like a hope chest. RE: The volume of sea chest BUGGAR (Structural) 16 Mar 16 14:30 Hoping it doesn't clog. So those are those things that kept shutting down the catamaran From Seattle to Vancouver when they ran over logs and orcas and stuff. I used to love that - it meant open bar. RE: The volume of sea chest DSGPDE (Mechanical) 29 Mar 16 20:22 To calculate a sea chest volume: - calculate sea water consumption (sea water cooling, firewater, sea water service, watermaker systems) for each sea chest - find sea chest nominal diameter from the consumption - check Regulations. Should the unit comply with the latest EPA regulations? Some examples: 1.5 ft/s for common use, 1 m/s for ice class, 0.5 ft/s for EPA. find required open cross-sectional area - calculate actual open cross-sectional area. Make sure to subtract the grill - make adjustments and start over RE: The volume of sea chest myvo (Mechanical) (OP) 30 Mar 16 02:30 we caculated the sum of flow of pumps use for cooling, fire fighting... And we caculated the dimension of grating in the sea chest and dimension of pipe joint with sea chest. But i can't calculate the volume of the sea chest. Can you give me the fomula to calculate it, please? Thank you so much. RE: The volume of sea chest MikeHalloran (Mechanical) 30 Mar 16 03:12 Can you tell us what Class Rules apply to your boat? Mike Halloran Pembroke Pines, FL, USA RE: The volume of sea chest DSGPDE (Mechanical) 30 Mar 16 14:00 myvo, the volume should accommodate dimension of grating and dimension of pipe joint. Sea water velocity inside the sea chest should not exceed the allowable velocity (by Regulations and by requirements of piping systems). Usually the safety margin involved. Basically, it is not a volume calculation, but just a dimensioning. I do not use a formula, but draw a conclusion based on aforesaid. RE: The volume of sea chest myvo (Mechanical) (OP) 15 Apr 16 07:27 We usually use the Viet Nam register, NK, sometimes apply Lloyd. RE: The volume of sea chest bratk (Marine/Ocean) 16 Apr 16 10:30 Myvo, there are regulations and rules to calculate the grating sizes and the seachest cross over pipe size. If you are looking at size of the chest, it has to be able to accommodate your pipe size. Suppose your cross over pipe is 12", you will need the chest of atleast 1 m x 1 m considering the stiffners and plates. It should also match with your frame spacing of the vessel. For calculating the grating and cross over, it has been explained. Please note as per NK and LR, the area of the grating should be twice the area of the cross over pipe.