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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Let us say cargo surveyor provided the density at 15 deg C as 0. 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. Knowledge dies if it remains in our head.

This will be the volume at the observed temperature. Glad you found it helful Jorge. So we then tabe 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.

We need to apply Weight correction factor WCF to the standard volume to get the weight of the cargo. But in any case, we still need the weight of the cargo as the stability calculations need the weight of the cargo in each tank and not the standard volume.

In the vacuum, there is no buoyancy and hence the weight is more than the same weight when measured in air. Coming back to the topic, can you guess for the same amount of cargo which weight would be more?


We then need to apply the weight correction factor WCF to convert the standard volume to weight. And even for the main ASTM tables, the information about which table need to be used for cargo calculation is provided by cargo surveyor.

Basics of 53 calculations Ok, now let us get back to basics of cargo calculations on tankers. The density table could look something like this. Now at many places may be using the standard volume instead of weight. And to do that we need to apply the volume correction factor. This means that Density at 31 Deg C would be: Conclusion Cargo calculations are sometimes tricky.

We need the density of the cargo to convert the volume of cargo to the weight. How to convert weight in Vacuum to weight in Air? Rajeev Jassal has sailed for over 19 years mainly on crude oil, product and tabls tankers. Take a deep breath and read on. Well, the weight is Vacuum is always more than the weight in Air.

So as we found out the weight conversion factor for API 66 is 0. And as you might have guessed correctly, these ports also do not measure the temperature in Deg C but in Deg F. This article would aim to simplify the cargo calculations on tankers.

ASTM Table 53 / 54

ASTM tables without any letter are common for both crude oils and product oils. Tun Oct 18, Ok, so now here is the first thing that we can learn.

MySeaTime Blogs Learn the difficult concepts of sailing described in a easy and story-telling way. There are so many tables to use and so many terms that float.

ASTM Table Series for Oil Survey

Density at 15 Deg C and ASTM table to use The previous two methods are useful and applicable for cargoes the density for which changes proportionally with temperature.


But we need to understand that at 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 cargo. Let us use the same volumes and temperatures that we have used in our initial example. But there are other ASTM tables that supplement these tables that we discussed so far. Always waiting for more articles. The cargo calculations, in this case, are also easy. There are different ASTM tables for crude oil and for product oils.

When we apply this WCF to the standard volume, we get the weight of cargo in Air. This is true especially for vegetable oils Correct me if I am wrong. But while we do all this, sometimes we just fail to do the simpler things right. 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.

ASTM Table 53 / 54

Remember volume changes with temperature. A Table of densities at different temperatures The cargo surveyor may provide a table of densities at different temperatures. We can apply this WCF to the standard volume to get the weight of cargo in the air.

Written by Capt Rajeev Jassal on September 23,