Posts about table 53A written by ronmooring. both ASTM and tables , calculations for Special Applications, LPG/NGL calculations). Volume VII – Generalized Crude Oils (Tables 53A & 54A) Volume VIII – Generalized Products (Tables 53B and 54B) Volume IX – Individual. If ” PRODUCTS ” TABLES 54B and 6B are selected, 1, A.S.T.M. TABLES. 2
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This is because, like with water, air and any other medium in which the weight is present would offer some kind of asym which reduces the weight. In above ullage report, I have applied the WCF to the Gross standard volume but we can easily make one additional column and apply the WCF to the standard volume of each tank to get the weight in the air for each tank.
Here is how the ullage report will look like.
So we then need to either convert the weight in vacuum to weight in the air as we discussed earlier or we can simply convert the density in Vacuum to density in Air. The first page of the ASTM table 56 provides the factor for converting weight in vacuum to weight in air and vice versa. The standard volume of the cargo would also remain same as this is the volume at the fixed temperature 15 Deg C.
Now at many places may be using the standard volume instead of weight. So as we found out the weight conversion factor for API 66 is 0. Will try to write on similar topic for LPG. The cargo calculations, in this case, are also easy.
ASTM Table Series for Oil Survey
If the cargo temperature is between two values in the density table, we just interpolate to the get the density at the desired temperature. In the vacuum, there is no buoyancy and hence the weight is more than the same weight when measured in air. Thank you sir, for explaining complicated topics in such a lucid manner, its an art There are different ASTM tables for crude oil and for product oils.
All this to make sure ttable we have the capacity to load maximum cargo and ship owner has a chance to earn maximum from it.
Short, crisp and full of value. If that was not enough, humans on this planet earth have managed to confuse it further. We multiply both and we get the weight of the cargo. Thank you very much for your kind effort for explaining cargo calculation in a very simple language. This is the reason “Albert Einstein Quotes.
Cargo Calculations on Tankers with ASTM Tables: Here is all you need to know – MySeaTime
Basics about Volume and weight Before we proceed to the complex things, it is better to start with the basics. Remember volume changes astj temperature. While the ASTM tables that we discussed in previous sections are the one that is used mostly, there are other ASTM tables that supplement these main tables.
Density at a particular temperature and correction factor Atm let us say that cargo surveyor has provided us with the density at a particular temperature and correction factor.
So in our case, the WCF would be: The cargo surveyor may provide a table of densities at different temperatures. The one with letter A is for crude oils and the one with letter B is for product oil.
So as we can see for temperature 34 Deg C, the volume correction factor is 0. Share your knowledge by writing answers tavle the question. Rajeev Jassal has sailed for over 19 years mainly on crude oil, product and chemical tankers.
ASTM Table 53 / 54
Now the final ullage report will look like this. Let us say we are interested in calculating the weight in Metric Gable in the air.
We need to follow the information provided by the cargo surveyor because that would be the table that is used for shore calculations and we need to use the same to avoid ship shore quantity difference.
But there are other ASTM tables that supplement these tables that we discussed so far. Your work is greatly appreciated, Sir! Ok, now 53q us get back to basics of cargo calculations on tankers.
These detailed and well researched articles provides value reading for all ranks. Let us say the cargo surveyor has provided the API gravity at 60 F to be The density at 15 Deg C is always the density in Vacuum. Pushkar Oct 30,