استفسار

بسم الله الرحمن الرحيم
الاخ/ ABDULRHMAN
السلام عليكم ورحمة الله وبركاته
عيدكم مبارك وكل عام وانتم بخير
تفضل هذه معادلة الجدول 54A

API MPMS 11.1, Table 54A

The calculation demonstrated in this page is from the American Petroleum Institutes's Manual of Petroleum Measurement Standards, chapter 11, section 1. Table 54A is a lookup table generated and published by API used for correcting an observed volume of generalised crude oil from observed temperature to its volume at 15 Deg C.

If the product is not crude oil, then Table 54B should be used instead.

Our interest in this equation is to correct crude oil's observed volume at an observed temperature to volume at 15 Deg C. In order to do this with Table 54A equations, we need flowing temperature and the oil's base density.

The algorithm for the calculation is straightforward and involves no iteration. It works as follows:

* Round input data to specifications.
* Exit with error if the data is outside the correlation bounds.
* Calculate temperature change from 15 Deg. C (Delta T)
* Calculate Alpha [= K0/Den152 + K1/Den15]
* Calculate VCF [=e(-alpha * Delta T - 0.8 * alpha2 * Delta T2)]
* Set extrapolation flag and exit.

The extrapolation flag is an integer flag that allows us to see whether the density we have calculated was part of the original observed area of the table, or is part of the extrapolated area. It will have a value of -1 if we exited with an error, 0 if we exited with an observed density and 1 if we exited with an extrapolated density.

The math used in the algorithm is defined in terms of integer-only math. Even the exponential function is approximated by using multiplication, addition, subtraction and division of the first seven terms of the power series that the exponential function represents. This is done so that the results obtained are rounded at each calculation point in a precise, defined way, and the decimal places carried are controlled throughout the process. In short, the algorithm uses integer mathematics for reasons of repeatability.

The source code provided in the specification is written in Fortran, which only allows "GOTO" type conditional looping. In the RTU, this can be faithfully implemented as instruction list, but Java makes no provision for a GOTO, and neither does structured text. Also, the Fortran does not neatly break up into loops that can be expressed in a structured way. Therefore some liberties had to be taken in interpreting the algorithm in a way that Java permits. No differences were encountered in running the test cases included in the specification against the results obtained with this applet.

ويمكن استخدام نفس المعادلة للجدول 54B فقط تقوم بتغيير قيمة المعامل (K0 ) .
والمعامل ( K1 ) يساوي صفر في الجدولين. وبالنسبة للجدول 54C لم اجده عندى وسابحث لك عنه بإذن الله.
اخي الكريم ارجوا ان اكون قد افدتك ولو بالقليل واي استفسار او توضيح فارجاء منك ان تعلمني حتى اقوم بالايضاح او الاجابة
وبالتوفيق ان شاء الله.

بسم الله الرحمن الرحيم
الاخ/
ABDULRHMAN
السلام عليكم ورحمة الله وبركاته
بالنسبة للجزء الاول من استفسارك والذى يخص قياس غاز LPG فان الجداول الخاصة بتصحيح الحجم للغاز المذكور هي مجموعة جداول القياس التى تحمل الحرف E . وهي
Temperature Correction for the Volume of NGL and LPG Tables 23E, 24E, 53E, 54E, 59E, and 60E
اما اين تجد قيمة كلا من K0 ,K1 فتجدها في API Manual of Petroleum Measurement Standards
ارجوا ان اكون اجبت على اسئلتك واتمنى لك التوفيق.
اخي الكريم اي سؤال او استفسار بالخصوص فاننى في الخدمة ان شاءالله
والسلام عليكم ورحمة الله وبركاته
هذان الملفان ارجوا ان يفيداك

[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذا الرابط]