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HomeMy WebLinkAboutDRB17-0189_CGA-P-41 Locating Bulk Storage Systems In Courts_1499808660.pdf CGA P-41-2010 LOCATING STORAGE TE IN COURTS FIRST EDITION • COMPRESSED GAS ASSOCIATION, INC. 4221 Walney Road, 5th Floor Chantilly, VA 20151 Phone: 703-788-2700 Fax: 703-961-1831 E-mail: cga@cganet.com PAGE ii COMPRESSED GAS ASSOCIATION. INC. CGA P-41-2010 PLEASE NOTE: ' The information contained in this document was obtained from sources believed to be reliable and is based on technical information and experience currently available from members of the Compressed Gas Association, Inc. and others. However, the Association or its members, jointly or severally, make no guarantee of the results and assume no liability or responsibility in connection with the information or suggestions herein contained. Moreover, it should not be assumed that every acceptable commodity grade, test or safety procedure or method, precaution, equipment or device is contained within, or that abnormal or unusual circumstances may not warrant or suggest further requirements or additional procedure. This document is subject to periodic review, and users are cautioned to obtain the latest edition. The Associa- tion invites comments and suggestions for consideration. In connection with such review, any such comments or suggestions will be fully reviewed by the Association after giving the party, upon request, a reasonable op- portunity to be heard. Proposed changes may be submitted via the Internet at our web site, www.cganef.com. This document should not be confused with federal, state, provincial, or municipal specifications or regulations; insurance requirements; or national safety codes. While the Association recommends reference to or use of this document by government agencies and others, this document is purely voluntary and not binding unless adopted by reference in regulations. A listing of all publications, audiovisual programs, safety and technical bulletins, and safety posters is available via the Internet at our website at www.cgalet.com. For more information contact CGA at Phone: 703-788-2700, ext. 799. E-mail: customerservicena,cganet.cam. Work Item 06-175 Bulk Distribution Eouipment and Standards Committee r1J FIRST EDITION:2010 ©2010 The Compressed Gas Association,Inc.All rights reserved. <'.. All materials contained in this work are protected by United States and international copyright laws. No part of this work may be reproduced or transmitted in any form or by any means,electronic or mechanical including photocopying,recording, or any informa- tion storage and retrieval system without permission in writing from The Compressed Gas Association, Inc. All requests for permission to reproduce material from this work should be directed to The Compressed Gas Association, Inc.,4221 Walney Road, Suite 500,Chantilly VA 20151.You may not alter or remove any trademark,copyright or other notice from this work. CGA P-41-2010 COMPRESSED GAS ASSOCIATION, INC. PAGE iii Contents Page 1 Scope 1 rs 2 Buik storage system requirements 1 3 Types of installations 1 3.1 General 1 3.2 Outdoor installations 1 3.3 Courts 4 3.4 Changing a court to an outdoor installation 4 4 References 5 Figures Figure 1—Two connected wails with nearby nonconnected walls 2 Figure 2—Two connected walls with no or distant nonconnected walls 3 Figure 3—Three connected walls 4 ti"errir i • 1, ) ' • CGA P-41-2010 COMPRESSED C-AS ASSOCIATION, INC. PAGE 1 1 Scope This publication provides auidelines for the safe siting, installing, and operating of bulk storage systems (oxy- gen, nitrogen, argon, carbon dioxide, nitrous oxide or hydrogen) in courts where reduced airflow can create an oxygen-deficient or oxygen-enriched atmosphere. This publication appiies to bulk cryogenic storage systems, not to gaseous compressed gas storage systems. NOTE—Carbon dioxide and nitrous oxide are technically not considered cryogenic liquids, but their liquid storage systems are covered by this document. For the purpose of this publication a bulk liquid storage system is defined by NFPA 55, Compressed Gases and Cryogenic Fluids Code or NFPA 99, Standard for Health Care Facilities[1,21 For the purpose of this publication, a court is defined as an open, uncovered, unoccupied space, unobstructed to the sky, bounded on three or more sides by exterior building walls, or freestanding wails [1]. 2 Bulk storage system requirements • Some authorities having jurisdiction (AHJ) may require that bulk storage systems be located within courts either • for aesthetics or for protection from weather conditions (e.g., hurricanes or tornadoes) and the subsequent fly- ing debris. The current codes and standards for bulk storage systems have some basic requirements but do not cover all possible conditions, nor do they provide methods for improving site access issues. Some of the issues are: – The codes do not include all potential cases(e.g., walls in proximity but not connected to each other); ,, • • – The codes do not provide specific rules for locating bulk systems in courts; and – The codes contain no provisions for methods to verify or increase air circulation and reduce the hazards of courts to a level equivalent to or less than that of an open outdoor area. 3 Types of installations 3.1 General It is preferable to locate bulk storage systems outdoors, aboveground, and not diked. The location shall not • expose the system to radiant heat that can create a hazard to equipment or personnel. There are three classes • of installations: outdoor, courts, and indoors. Outdoor installations shall meet the requirements of NFPA 55 and CGA P-18, Standard for Bulk Inert Gas Systems (where applicable) [1, 3]. Installations in courts shall meet the requirements in 3.3 of this publication. Indoor installations shall meet the requirements of NFPA 55 and CGA P- 18 (where applicable). 3.2 Outdoor installations 3.2.1 General requirements The following requirements are for locating bulk systems within walled or other ventilation restricted areas (e.g. bulk sites with solid fencing) without roofs such as courts. Figures 1, 2, and 3 show examples of how these re- quirements apply. A site that meets these requirements shall be considered an outdoor installation and shall also comply with the requirements of the following: – for liquid nitrogen, helium, and argon systems see CGA F-18 [3]; – for all other bulk storage systems see NFPA 55 [1]; or – for health care facilities NFPA 99 [2]. I ' References are shown by bracketed numbers and are listed in order of appearance in the reference section. PAGE 2 COMPRESSED GAS ASSOCIATION.INC. CGA P-41----2010 yx The distances shown in the figures are minimums and do not replace greater distances that can be mandated ,j for fire protection. For example, an oxygen tank cannot be located closer than 50 ft from a Type Ill. IV, or V building as defined in NFPA 5000, Building Construction and Safety Code® [4]. Therefore, the distance be- Ci tween the tank and the building cannot be the building's wail height if that distance is less than 50 ft. Another L it example is that of medical gas supply systems where NFPA 99 mandates greater separation distances from ; walls (3 ft instead of 1 ft). in ail cases, the more stringent code shall apply. Li Openings may be gated with chain link or metal grated fencing such that airflow area is no less than 50%. Slats. wood boards, etc., shall be considered reductions in airflow area and are not recommended. i Walls shown in the figures below are solid walls with a height over 44 in. Solid walls are defined to have more than 50% closed wail surface, unless engineering calculations can show sufficient airflow with this reduced sur- i face area. Wall heights of less than 44 in are considered curbs or protective barriers not walls. ;;';.i 3.2.1.1 Two connected wails There are two basic cases for locating a tank near two connected walls. Figure 1 shows an example of re- quirements where the tank is 1 ft from one wall. The operating side of the tank (fill connection) shall face out- IF11. ward. The tank shall be no closer to wall one or wall three than 1 ft. If the 1 ft minimum distance to wall one is in- creased the distance to wall three may be decreased by that same amount so that the total distance between wail one and wall three has not changed. The minimum distance between wail one and wall three shall be the sum of 1 ft plus the tank diameter plus the height of wall one or three, whichever is lower. Connected wall -I ;:iiiii s%, s '7 kt sAa"y�u`S't ayt�y. pita C iF j1k.,�, Lai kt ^.` left -- (min) For trailer access x --SF- '--' " E Oft Tank fill connection • (max) - v TO -o m 4 m ',, Tank '— Height of m �";� ' Wall 2(min) ` m c i � U o N. / C �_— Z , 7y;1 J� I` p C o] M N s -kit ...�, ,x:R�`e.'�?�i-., �43�zh k��„. IY.It, �'�F Aga ; 4 i ` Nonconnected wall 3 Figure 1—Two connected walls with nearby nonconnected walls CGA P-41-2010 COMPRESSED GAS ASSOCIATION, INC. PAGE 3 Figure 2 shows an example of requirements where the tank is 1 ft from each of two walls. As in Figure 1, the i...?. operating side of the tank (fill connection) shall face outward. The tank shall be no closer to wall one or wall three than 1 ft. If the 1 ft minimum distance to wall one is in- creased the distance to wall three may be decreased by that same amount so that the total distance between wall one and wall three has not changed. Connected wail 1 sccn rt,- k",�a��. �' "d' Y2.a2,�su,A� 15 ft i (mm) �. For hailer access C 4 ft (max) ,,d Tank fill connection la-- Tank(-) main) a m kiG, A aaa 2 1 Yti .u^ ry � IT xk 2 it 3 ft (min) , ;�`�, t c.'r Nonconnected wall 3 Figure 2—Two connected walls with no or distant nonconnected walls '. 3.2.1.2 Three connected walls Figure 3 shows an example of three connected walls nearby where the tank is 1 ft from one wall. As in Figure 1, the operating side of the tank(fill connection) shall face outward. The tank shall be no closer to wall one or wall three than 1 ft. If the 1 ft minimum distance to wall one is in- creased the distance to wall three may be decreased by that same amount so that the total distance between wall one and wall three has not changed. The minimum distance between wall one and wall three shall be the sum of 1 ft plus the tank diameter plus the height of wall one or three,whichever is lower. PAGE 4 COMPRESSED GAS ASSOCIATION. INC. CGA P-41-2010 Connected wet 1 11 'a ';.-.{,..-,-2,222-.2---'k o c = 2t ;; (15 ft .. min T e For trailer access i O t W r k N R n) { N 3 u c N 1 / N 3 O Z p�j /f Tank Height or _.. O / i Wall2 (min) t: 1. Tank ill connection 1 1 ` I--- oft --I t ci 2. (max) I E ?ki ur EN .. n' t ^.„ . `-2-22,2 acs,),,,ri,, ' H 1 ft-aLz--:.._ftft.,+: �a " : r^ 3 ,ift;:-.1,1-.', i ;.e. si ;. Connected wall 3 Figure 3—Three connected walls 3.3 Courts Bulk storage systems whose siting does not meet the requirements of 3.2.1 shall be considered to be in courts. The bulk storage system shall follow these requirements: – Route all vent lines (safety valves, bursting disks. vent valves, etc.) to a safe location that may be outside the walled area or to an elevated location. Vent piping design must take into consideration the effect of gas venting upon site specific conditions and shall not introduce additional hazards; – Locate the bulk vessel near the access gate to the court with an unobstructed view of the bulk vessel valves, pressure gauge, liquid level gauge, and full trycock. The total distance from the delivery unloading point to the bulk vessel shall be 25 ft or less, unless additional engineering measures have been taken; – Use portable atmospheric monitoring when service technicians are working inside the court. Permanent atmospheric monitoring is not required; and – Post warning signs to indicate potential hazards. 3.4 Changing a court to an outdoor installation To change a court to an outdoor installation (no special provisions needed) use the following: – Courts shall have adequate natural ventilation or mechanical ventilation at a rate of 1 cfm per foot squared I... of surface area. When installing louvers, openings, or ventilated blocks they shall be installed at the base of the wall; CGA P-41--2010 COMPRESSED GAS ASSOCIATION, INC. PAGE 5 - A hazard assessment of the site shall be performed by an experienced professional to identify and mitigate the hazards; NOTE—For oxygen hazard assessments it is not necessary to consider asphyxiation but needs to cover oxygen en- 1 richment. _zl. - Locate the bulk vessel near the access gate to the court with an unobstructed view of the bulk vessel IN valves, pressure gauge, liquid level gauge, and full trycock. The total distance from the delivery unloading point to the bulk vessel shall be 25 ft or less, unless additional engineering measures have been taken; - Reduce risks with warning signs and standard operating procedures; and - Service technicians shall use portable atmospheric monitoring when working inside the walled area. 4 References Unless otherwise specified, the latest edition shall apply. [1] NFPA 55, Compressed Gases and Cryogenic Fluids Code, National Fire Protection Association, 1 Battery- march Park, Quincy, MA 02269. www.nfpa.orq [2] NFPA 99, Standard for Health Care Facilities, National Fire Protection Association, 1 Batterymarch Park, Quincy, MA 02269. www.nfpa.orq [3] CGA P-18, Standard for Bulk Inert Gas Systems(an American National Standard). Compressed Gas Asso- ciation, Inc., 4221 Walney Rd., 5th Floor, Chantilly, VA 20151. www.ccianet.com [4] NFPA 5000, Building Construction and Safety Code®, National Fire Protection Association, Batterymarch Park, Quincy, MA 02269. www.nfpa.orq