2011Fall ISO 28300 Meeting Minutes

Meeting Minutes

TASK FORCE ON ISO 28300/API STD-2000

COMMITTEE ON PRESSURE RELIEVING SYSTEMS

API 2011 Fall Refining and Equipment Standards Meeting

08:30 A.M. – 09:00 A.M. Hyatt Regency Century Plaza Wednesday, November 16, 2011 Los Angeles

Brad Otis, Convenor ISO 28300

Brad Otis, Chairman API STD 2000

Michael Davies, Project Leader ISO 28300

I. Introductions and registration of attendance (All) The meeting started at 8:30 AM. Brad Otis, Convenor ISO 28300 and Chairman API STD 2000, led the meeting. Michael Davies, Project Leader ISO 28300, was present as well as 50 attendees. The attendance and distributions lists were circulated around the room.

II. Appointment of secretary to keep meeting minutes (All) Thomas Heidermann volunteered to keep the minutes.

III. Approval of meeting minutes Spring 2011 ISO-28300/API 2000 Seattle Meeting Minutes The meeting minutes were approved with the following amendments:

 The statement under VI 6) is not an official request from NFPA 30 Technical Committee.

 Replaced “arrestor” with “flame arrester” in section VI 1)

IV. Review of inquiries / correspondence on API 2000/ISO 28300 a) Old inquiries

i) 2010-12-15 Unit of “M”

I believe you represent Shell on the API technical working group for various standards, including API 2000?

I am just enquiring on the off chance that you can help with an issue raised. In the latest version of API 2000, equation 21 in section 6.3.2.2.1 includes the term “M” which is supposed to be the “relative molecular mass of the test medium”.

This phrasing is somewhat confusing, and can’t be resolved by dimensional analysis, as the units for the constant aren’t provided.

1 Can you please confirm (or point me in the direction of someone who can…): Is this supposed to be Molecular Mass of the test medium (i.e. kg/kmol), or relative molecular mass compared to air (MW of test medium / 28.96)?

In terms of actual calculated numbers, certainly appears to be Mw of the test stream.

Thanks,

Andrew

Andrew Inwood Senior Process Engineer Shell Todd Oil Services Ltd 167 Devon St West, New Plymouth, New Zealand Tel: +64 6 757 7227 Email: [email protected] Internet: http://www.stos.co.nz

Response: The definition of the molecular mass of the medium “M”.

Brad to send this response back inquirer.

This and its units should be included in ISO 28300 and shared with Ed Zamejc for API 521. Action item not assigned to an individual. ii) 2011-01-31 Flow Adjustment to Air at Standard/Normal Conditions

From: [email protected] [mailto:[email protected]] Sent: Monday, January 31, 2011 3:37 AM To: Standards Subject: API-2000 Sixth Edition

Dear Sir/ Madam,

This refers to the ANSI/ API Standard 2000 (Sixth Edition, November 2009). Request to have some clarification for the methodology adopted and formulae derived for estimating out-breathing and in-breathing requirements due to liquid filling and liquid discharge. This will help to correctly apply the principles which API recommends.

Refer Section 4.3.2.2.1. The out-breathing flow volumetric flow rate, Vop, is expressed in SI unit of cubic meter per hour of air, for products stored below 40 °C or with a vapour pressure less than 5.0 kPa, shall be given as

Vop= Vpf, where Vpf is the maximum volumetric filling rate, expressed in cubic meters per hour.

As per above clause it is considered that if the tank is operating at close to atmospheric pressure [Pop] (say, 10 kPa g) and ambient temperature [T] (say, 30 °C), the out-breathing rate shall be Vop (m3/hr) of air at actual operating pressure

2 (10 kPa g) and operating temperature (30 °C). This flow will be converted into equivalent air at normal conditions (1.013 bara and 0 °C) as per the conversion co-relations given in the standard. If the tank is under nitrogen blanket at same operating pressure and temperature as above, the out-breathing rate Vop is the nitrogen flow rate at actual operating conditions (10 kPa g and 30 °C) and needs to be converted into equivalent air rate at normal conditions (1.013 bara and 0 °C).

Above query is also applicable to clause 4.3.2.2.2 for in-breathing flow rate estimation.

Since the clauses mention flow rates in terms of air only, the case of blanketed tank is not very clear.

I would be grateful if API shades light on above queries.

Thanks in advance for your valuable support.

Warm Regards, Unmesh Shevade

Response: this isn’t an interpretation request but a request for additional guidance which doesn’t yet exist. How to handle flow rates at normal/standard or process conditions and the conversion between flow rates at different conditions will be a new work item for the DIS.

Brad to send this response back inquirer. iii) 2011-03-01 Tank Volume vs Liquid Capacity

Publication Type: Std Publication API 2000 Number: Edition: 6th edition Addendum/Errata: Number: Section 4.3.2.3.2/ 3 Referenced: Subject: Tank Volume for thermal inbreathing and outbreathing 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 Background: 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

3 tank is the intended one? First Name: Unmesh Last Name: Shevade Email: [email protected] Company: Aker Solutions Phone: 91-22-66416205

Discussion: It was suggested to respond that the gross volume is the total volume, including the roof volume. This needs to be worked more in the committee. Response: on hold b) New inquiries

i) 2011-09-16 Height for Control Devices

Publication Type: API Publication 2000 Number: Edition: 6 Addendum/Errata: Number: Section Text Referenced: Subject: Tank vents -- ducting Background: See below What is minimum vertical vent height for take offs from vapor Question: 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: [email protected] Company: TMTS Associates, Inc. Phone: 404 627 4722

Discussion: The committee was not able to understand the intention of the question. The question shall be clarified.

4 ii) 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: Michael Davies will write a brief paper which will explain the different assumptions made with the two methods.

V. Old Work Items a) Status of DIS-28300

One team worked on the ability to perform vapour/flash calculations and another team revised language. All changes were included into the document, which was sent out to ISO. The document has been submitted to ISO for release as a DIS.

VI. New Work Items a) Forward plan

The ISO deadline for the ballot will be in 5 Months. The comments of all countries will be collected and reviewed at the next spring meeting.

b) Other

no other business

VII. Adjourn The meeting was adjourned at 9:00 am