API 650 Tank Design Calculation Excel: A Comprehensive Guide

The design of an API 650 tank requires careful consideration of various factors, including the type of roof used and the internal floating roof. One common configuration is a fixed cone roof with an internal floating roof.

In this article, we will explore the calculation process for designing an API 650 tank using Excel. We will also discuss the importance of selecting the right vendor or fabricator for the project.

Calculation Overview

The calculation involves several steps, including determining the tank's dimensions and calculating the stresses on the tank's walls and roof. The formula used is:

td = 2.6(D)(H -1)(G)/S

Where:

td = thickness of the plate

D = diameter of the tank

H = height of the tank

G = specific gravity of the liquid

S = allowable stress

The vendor or fabricator will need to provide additional information, marked with an asterisk (*), including the operating temperature and flash point.

Design Specifications

In addition to the calculation formula, the design specifications for the API 650 tank include:

* Internals: This includes the insulation and fireproofing requirements.

* Operating Temperature: The maximum operating temperature of the tank is 30 degrees Celsius.

* Flash Point (Closed Cup): The minimum flash point is 31 degrees Celsius.

* Negative Pressure: The tank must be designed to withstand a negative pressure of 34 Psig.

Storage Tank Specification

The storage tank specification includes information such as:

* Vapor Pressure Max: The maximum vapor pressure that the tank can withstand.

* Minimum Fluid Temperature: The minimum temperature at which the fluid in the tank will not freeze.

Commercial Programs vs. ASME Software

While commercial programs like API software can be useful for designing an API 650 tank, they may require additional calculations to ensure accuracy. It is essential to verify the accuracy of the results and compare them with hand-calculated values or another API program.

Smaller Vendors vs. Larger Companies

Working with smaller vendors can have its advantages, including more open communication and a willingness to correct errors quickly. However, larger companies may have more resources and experience in designing and building API 650 tanks.

Designing an API 650 tank requires careful consideration of various factors, including the type of roof used and the internal floating roof. By using Excel and following the calculation formula, designers can ensure that their design meets the required specifications. Additionally, selecting the right vendor or fabricator is crucial for a successful project.

By considering the pros and cons of commercial programs versus ASME software and working with smaller vendors or larger companies, designers can create a comprehensive design that meets the needs of their clients.

Api 650 tank design calculation excel