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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In the vacuum, there is no buoyancy and hence the weight is more than the same weight when measured in air. Also, the volume is measured in Barrels and not in cubic meters. But there are other ASTM tables that supplement these tables that we discussed so far. Rajeev Jassal Oct 14, Written by Capt Rajeev Jassal on September 23, And as the density also changes with the temperature, we would need the density of the cargo at the cargo temperature to convert the observed volume to weight.
The one with letter A is for crude oils and the one with letter B is for product oil.
We just take the density of the cargo to the corresponding cargo temperature that we measured. So, in the same manner, we get the VCF Volume correction factor for other required temperatures that we have measured in each tank. All of your blogs did a vast contribution to pass my orals exam from uk in my first attempt In air or in Vacuum Apart from the units, weight is measured in air or in Vacuum.
ASTM Table 53 / 54
And when we multiply the volume at observed temperature with VCF, we get the standard volume, this time the volume at 60 Deg F. So how these calculations are performed on chemical tankers???
We make sure that there are least constants on the ship, the ballast is pumped out to the last drop and many other things like these. Will try to write on similar topic for LPG. Let us say the provided values are Density at 25 Deg C: But in any case, we still need 5a3 weight of the cargo as the stability calculations need the weight of the cargo in each tank and not the standard volume. Similarly, we need to find the VCF for cargo temperatures of other tanks.
Ivan Sep 23, First, check what cargo surveyor has provided you. Here is all you need to know.
Things as simple as cargo calculations. This is something a chief officer cannot afford to do it wrong. Really helpful sir, I am preparing for Ch Mates phase I exams ans as I am from a dry cargo background, this artice really helped me out.
Ok, so now here is the first thing that we can learn. The density table could look something like this. There is a simple formula to convert these.
Adjunct to D Petroleum Measurement Tables Volume VII D 80 (HISTORICAL) – ADJD
The cargo calculations, in this case, are also easy. We also measure the temperature of the cargo preferably at three tabld and take the mean of these three temperatures to get the temperature of the cargo.
A Table of densities at different temperatures The cargo surveyor may adtm a table of densities at different temperatures. Different manufacturer may have different densities for same chemical. Remember volume changes with temperature. Get your hands on ASTM tables and you will find that cargo calculations are not as difficult as it seems. MySeaTime Blogs Learn the difficult concepts of sailing described in a easy and story-telling way.
So for these ports here tale what the volumes and temperatures in ullage report would look like. If we multiply these two, we get the weight by a simple formula. Share your knowledge by writing answers to the question Ask or answer a question. Volumes are measured in cubic meters at some places and barrels like in the US asstm other Weight is measured in Metric tons at some tablle and in long tons at other places and barrels at 60 deg F at other places. MySeaTime Podcast This podcast on the maritime matters will provide value to the listeners.
So in our case, the WCF would be: This is even easier than the previous section that we discussed. This means that Density at 31 Deg C would be: Knowledge dies if it remains in our head. And it is not that complicated.
ASTM Table Series for Oil Survey
Unit of weight What is the unit of this weight? Even though on ships it is more common to measure the cargo weights in 533a air, sometimes you may find that the charterers would give the requirements for measuring weight in Vacuum.
Thankyou sirvery well explained in simple words with deep explanation. This article would aim to simplify the cargo calculations on tankers. Krishna kumar Nov 10, But we need to understand that tbale the very basic level, we calculate the volume from ullage tables and we need to be provided with density at the same temperature as the aastm.
Vapour weight in LPG If the cargo temperature is between two values in the density table, we just interpolate to the get the density at the desired temperature. This is because, like with water, air and any other medium in which the weight is present would offer some kind of buoyancy which reduces the weight. Weight in air or weight in Vacuum?