FRANKO FLOWCALC v3.2

FRANKO FLOWCALC v3.2: A program and informative resource for sizing tank (gas) blanketing applications using the method of API 2000, 6th Edition, 2009. By purchasing this license, the user agrees to install it on only one computer and not to distribute it in any manner. FRANKO FLOW CALC is the copyright of Franco Instrumentacion SA de CV. Additional copies may be purchased at www.franko.ca. Thank you for your interest. Determining Valve and Vent Requirements for Tank Blanketing , Normal Breathing , and Emergency Venting to the

methods of API 2000, 6th Ed. This program will calculate the volumetric capacities of vents and gas valves to properly vent and gas blanket a tank within acceptable pressure limits by supplying the proper amount of gas to accommodate liquid outflow or contraction of vapors due to temperature decreases, and to vent the necessary amount of vapor from the ullage space of the tank to accomodate liquid inflow or expansion of vapors due to temperature rise. These are normal breathing conditions. It also calculates the emergency venting requirements for fire exposure. It considers non-refrigerated tanks that are uninsulated, or fully insulated. The program is configured for US units. This program is not evaluating other venting needs, such as vaporization due to chemical reactions. It does not design process piping, vapor breakthrough due to pressure transfer of product to load the tank, nor consider equipment failures. Failures of tank heating or cooling equipment, as well as vent gas treatment equipment, and internal ignition are some sources of failures that can effect the venting needs of a tank. The program does not consider partially insulated tanks. Further, the need for liquid overfill protection should be evaluated by the engineer. In order to use this program, or for that matter any engineering program, the user must be qualified and familiar with the system and theory. This program is not intended to be used by persons not qualified. It is not a learning tool. In order to safely and successfully design a gas blanketing system, it is strongly recommended that the user be familiar with existing literature and standards. As a minimum it is recommended that this familiarity include the following: 1. Tank Blanketing: A Complete Guide for Designers, Installers and Users by FRANKO Research company. This is available at http://www.franko.ca 2. ANSI/API Standard 2000, 6th Edition, American Petroleum Institute, Washington, D.C., This is available at http://www.api.org/Standards/ (this is equivalent to ISO 28300:2008) 3. Industry, engineering and government standards and regulations that apply to the location, the tank, static electricity protection and the stored product. Included could be ASME BPV and Piping codes. Also the API and ASME publish several standards and practices dealing with storage tanks, pressure relief devices, flame arrestors and venting valves to name a few. The sanitary industry publishes standards regarding proper materials and construction to maintain sanitary conditions. continued on next page.

Using the Program:

Print these instructions for future reference.

Please, be familiar with the theory, and concepts used in API 2000 6th Edition, before proceeding.

1. Proceed to the sheet "Input Data". Enter data into the yellow cells. This information will be printed on the Results page.

You will be required to calculate the tank volume as well as its wetted surface area. (The area is to be calculated up to a height of

30 ft.)

Refer to FRANKO specifications to find the insulation thermal conductivity.

2. After all data has been entered, proceed to the Results-Printout Page. Here you will find the calculated results, required

application considerations and two sketches of typical tank blanketing installations with pertinent notes for a proper installation.

Attention should be given to Note 3, when tank blanketing is used.

3. If your .NET software is defaulted to autocalculate, the answers will be in place. Else you will have to use the manual calculation

method, key F9. Autocalculate is found in TOOLS>OPTIONS>CALCULATION.

4. If you wish to be notified of program revisions and upgrades register by sending an e-mail to info@franko.ca and in the subject

line type FRANKO FLOW CALC.

This program, FRANKO FLOWCALC v3.2, and the associated documentation is (c) 2010

FRANKO FLOWCALC v3.2 ® ALL RIGHTS RESERVED

Description

Tag: Stored Liquid

Date: 12/20/2012

Instructions:

Entered the folling values in the fields, you might need a calculator and a conversion table to convert units (pressure, temperature, volume, etc).

Variable Value Wetted Surface Calc

Vpf = maximum volumetric filling rate, gpm 84 gpm Diameter 21 ft ATWS 2,262

Vpe = maximum volumetric discharge rate, gpm 84 gpm Length 25 ft

latitude <42° Y=0.32

Y = factor for latitude 0.320 latitude 42-58° Y=0.25

Latitude >58° Y=0.2

Vtk = tank volume, cu. Ft 8,934 ft3

h = note 1 below W/(m2*K)

lin = wall thickness of insulation note 1 below meters (note: inches *0.0254=meters)

λin = insulation thermal conductivity note 1 below watts/meter*kelvin

C = factor for various conditions 6.5 select from Table2 below

ATWS = Wetted surface area 2,262 ft2to a height of 30'

Q = Heat input 12,710,479 B/h

F = environmental factor 1.000

used for emer. Fire exposure venting)

L = Latent heat of vaporization, liquid 100 Btu/lb 100 for Diesel, gasoline 150,

M = Relative molecular mass of vapor 130.0

T = Abs. T of relieving vapour, R° 555 R°

NOTES: 1. For tanks with no insulation, do not enter values for h, lin or λin

assumed to be the boiling point at relieving conditions in

the tank

select from Table 9 below (1= no credit for insulation for

fire exposure. See table notes)

select from Table 4 below based on area and design pressure

API 2000 suggests 4 for typical tanksinside heat transfer coef for insulated

tanks

Calculo de Valvulas de Venteo para Tanque de almacenamiento

n/a n/a

ADDITIONAL INFORMATION FOR EMERGENCY VENT SIZING

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FRANKO FLOWCALC v3.2 ® ALL RIGHTS RESERVED

Customer

To:

Stored liquid

Tag

Date: 12/20/2012

(2) Out Breathing due to Product Inflow 674 scfh air

(4) In Breathing due to Product outflow 674 scfh air

(6) Thermal Out Breathing 1,738 scfh air

(8) Thermal In Breathing 11,673 scfh air

(12) Emergency Venting for Fire Exposure (notes 2 & 3) 811,775 scfh air

12,347 scfh air

Total Normal Outbreathing [ (2) and (6) ] (Note 3) 2,412 scfh air

Recommended Vent Size 3 Inches

Emergency Vent Size 20 Inches

Notes: 1. Numbers in parenthesis refer to the equation number in the API standard.

2. Installed normal out breathing capacity can be credited towards emergency requirement.

3. The fail open flowrate of blanketing valves, when used, should be added to this to accommodate the

case where that valve would fail open. Contact valve manufacturer for information.

For tank blanketing and/or Normal Inbreathing combine liquid

outflow and thermal in breathing requirements [ (4) and (8)]

n/a

Venting above ground storage tank, uninsulated or fully insulated

Results According to ISO 23800:2008 & API 2000, 6th Ed., 2009

WYN de Mexico SA de CV

Migeul Zamora

DescriptionCalculo de Valvulas de Venteo para Tanque de almacenamiento

n/a

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FRANKO FLOWCALC v3.2 ® ALL RIGHTS RESERVED