Meeting Agenda

TASK FORCE ON API STD-2000

COMMITTEE ON PRESSURE RELIEVING SYSTEMS

API 2012 Spring Refining and Equipment Standards Meeting

Brad Otis, Chairman API STD 2000

Michael Davies, Project Leader ISO 28300

I.  Introductions and registration of attendance (All)

II.  Appointment of secretary to keep meeting minutes (All)

III.  Approval of meeting minutes

Fall 2011 ISO-28300/API 2000 Los Angeles Meeting Minutes

IV.  Presentations

Annex A vs Main Body Calculated Inbreathing – Why the Difference (Michael Davies)

V.  Review of inquiries / correspondence on API 2000/ISO 28300

a)  Old inquiries

i)  2011-03-01 Tank Volume vs Liquid Capacity

Publication Type: / Std
Publication Number: / API 2000
Edition: / 6th edition
Addendum/Errata:
Number:
Section Referenced: / 4.3.2.3.2/ 3
Subject: / Tank Volume for thermal inbreathing and outbreathing
Background: / Sections 4.3.2.3.2 and 4.3.2.3.3 indicate formulae for thermal inbreathing and outbreathing with tank volume as one of the variable. The tank volume, Vtk, is typically considered as the gross volume of the tank (cylindrical section plus roof section). Similarly tank capacity in Annex A is the gross capacity of tank.
Question: / Is this interpretation of tank volume/ capacity as gross volume of tank is the intended one?
First Name: / Unmesh
Last Name: / Shevade
Email: /
Company: / Aker Solutions
Phone: / 91-22-66416205

Discussion: We previously suggested to respond that the gross volume is the total volume, including the roof volume. However, DIS comments challenged this.

ii)  2011-09-16 Height for Control Devices

Publication Type: / API
Publication Number: / 2000
Edition: / 6
Addendum/Errata:
Number:
Section Referenced: / Text
Subject: / Tank vents -- ducting
Background: / See below
Question: / What is minimum vertical vent height for take offs from vapor vents being ducted to a control device from gasoline/flammable liquid storage tanks? Tom McGowan 404 627 4722
First Name: / Tom
Last Name: / McGowan
Email: /
Company: / TMTS Associates, Inc.
Phone: / 404 627 4722

At the Fall 2011 meeting we asked what a control device was. Answer received was:

A control device would include:

Flare

Thermal oxidizer, catalytic oxidizer, recuperative oxidizer, regenerative oxidizer, or regenerative catalytic oxidizer

Activated carbon

Refrigerated condenser

Boiler or fired heater, or less commonly,

Biobeds

I think the focus here is the prevention of liquid carry over into the ducts (e.g., from overfilling the tank), which could cause duct failure, as well as failure of the control device.

iii)  2011-09-18 API-2000: Inbreathing Old vs New Standard

The API STANDARD 2000 SIXTH EDITION, NOVEMBER 2009 indicates method for calculation of thermal inbreathing by formula.

For a case where volume of tank is 300 m3, located in Muscat (latitude 23 deg) the C factor for hexane fluid is 6.5

Thus the inbreathing requirement for a uninsulated tank works out to be 352 Nm3/hr.

However Annexure A which gives an alternative calculation method gives 50.4 Nm3/hr as the inbreathing requirement based on Table A.3.

Appreciate if you could clarify this huge apparent discrepancy in the standard.

Thanks and regards,

Benoy John

Principal Process Engineer

Mott MacDonald & Company LLC

PO Box 587, PC 112, Ruwi

Sultanate of Oman

Discussion: Last time we said Michael Davies will write a brief paper which will explain the different assumptions made with the two methods.

b)  New inquiries

i)  2011-11-12 PVV Vacuum Certification

From Hasegawa of FUKUI co., ltd Japan

Thank you for your always effort above captioned ISO28300,

And we would like to confirm as following paragraph 6.2.4 Test tank

e) For testing vacuum valves, reverse the flow direction, i.e. air is drawn…..

Please revise as following into one word better; “reverse/verse”

Because ASME code requirements and addressed section 3 2010 Division1-Subsection ND class component ND-7751.3 test method of capacity ertification of vacuum relief valves could be used as followings sentence,

“capacity tests may be conducted by pressurizing the valve instead of using

a vacuum, ...”

We highly appreciate your prompt reply and your clarification,

even if you are very busy.

Thank you again and best regards

Proposed response: Pressurizing the vacuum side isn’t recommended because 1) PVVs typically will not have a flange on the vacuum side, and 2) PVVs should be tested in the way they are operated. There may be a difference in valve capacity if the flow is pushed through the device vs being pulled through the device.

ii)  2011-11-12 PVV 180,000 bbl limit

Publication Type: / API
Publication Number: / 2000
Edition: / 6TH
Addendum/Errata: / -
Number: / -
Section Referenced: / A.1.2, A.1.3 and Table A.3
Subject: / Normal venting requirements for thermal effects, when tank capacity is greater than 30 000 m^3.
Background: / In-breathing & out-breathing normal venting requirements (Nm^3/hr of air) as per table A.3 on page 39 of API 2000, 6th edition are based on the boundary conditions and assumptions furnished in clause A.1.2 of page 36 with the volume of the tank less than 30 000m^3 (180 000 bbl).
Question: / What should be the approach & attitude of a process engineer to carry out safe flow rates of air (Nm^3/hr)when a tank capacity is greater than 30 000 m^3?. Can we use the linear extrapolation method to determine In-breathing (page39,Column 2) & Out-breathing (page 39, Column 3,4) Nm^3/hr of air quantity?
We request to API to offer an idea that will help everyone in my department to work from the same vision and will help in making work at a higher level of proficiency.
First Name: / Rahul
Last Name: / Deshpande
Email: /
Company: / P-Mech Consultant Pvt. Ltd.
Phone: / 0091-22-27814721/23/24 (Exten.47)

VI.  Old Work Items

a)  Status of DIS-28300

b)  API-2000 ballot

c)  Work DIS comments

VII.  New Work Items

a)  Forward plan

b)  Other

VIII.  Adjourn

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