CGA-G-1.7-2005.pdf
《CGA-G-1.7-2005.pdf》由会员分享,可在线阅读,更多相关《CGA-G-1.7-2005.pdf(19页珍藏版)》请在三一文库上搜索。
1、 CGA G-1.72005 STANDARD FOR STORAGE AND HANDLING OF CALCIUM CARBIDE IN CONTAINERS FOURTH EDITION COMPRESSED GAS ASSOCIATION, INC. 4221 Walney Road, 5th Floor Chantilly, VA 20151 Phone: 703-788-2700 FAX: 703-961-1831 E-mail: PAGE ii COMPRESSED GAS ASSOCIATION CGA G-1.72005 PLEASE NOTE: The informati
2、on 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 o
3、f 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 abnor
4、mal 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 revie
5、w, 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, . This document should not be confused with Federal, state, provincial, or m
6、unicipal 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. A listing of all publications, audiovisual programs, s
7、afety and technical bulletins, and safety posters is available via the Internet at our website at . For more information contact CGA at Phone: 703-788-2700, ext. 799. E-mail: . Docket 05-43 Acetylene Committee NOTETechnical changes from the previous edition are underlined. FOURTH EDITION: 2005 THIRD
8、 EDITION: 2003 SECOND EDITION: 1995 FIRST EDITION: 1992 2005 BY THE COMPRESSED GAS ASSOCIATION, INC. 4221 WALNEY ROAD, 5TH FLOOR, CHANTILLY, VA 20151 Printed in U.S.A. -,-,- CGA G-1.72005 COMPRESSED GAS ASSOCIATION, INC. PAGE iii Contents Page 1 Introduction.1 2 Scope and purpose 1 2.1 Scope 1 2.2 P
9、urpose.1 3 General Information1 3.1 Nomenclature1 3.2 Physical properties1 3.3 Chemical properties.1 3.4 Typical grades.2 3.5 Special precautions.2 4 Calcium carbide packaging 2 4.1 Regulatory requirements.2 4.2 Containers.3 4.3 Container labeling and placarding.4 4.4 Inspections 5 4.5 Handling “hot
10、” containers 6 4.6 Unloading bulk containers.7 4.7 Handling empty bulk containers 9 4.8 Returning empty containers.9 5 Outdoor storage .9 5.1 Location.9 5.2 Posting.10 5.3 Container management.10 6 Indoor storage10 6.1 Location.10 6.2 Posting.10 6.3 Electrical equipment11 6.4 Grounding11 6.5 Dust co
11、llection.11 7 Fire and explosion hazards 11 7.1 Calcium carbide and acetylene generation .11 7.2 Fire prevention.11 7.3 Fire fighting12 7.4 Emergency response.12 7.5 Cleanup of spills and leaks12 8 Health and hygiene 13 8.1 Health hazards 13 8.2 Protective equipment and personal hygiene .13 8.3 Firs
12、t aid14 9 Employee training requirements.14 10 References.14 Table Table 1Typical grades of calcium carbide .2 PAGE iv COMPRESSED GAS ASSOCIATION CGA G-1.72005 Figures Figure 1DANGEROUS WHEN WET label/placard for calcium carbide.5 Figure 2Typical warning sign for calcium carbide storage areas.5 Figu
13、re 3Typical receiving inspection checklist for calcium carbide containers6 Figure 4Typical purge schematic for bulk containers 7 Figure 5Typical purge schematic for bulk bags.8 -,-,- CGA G-1.72005 COMPRESSED GAS ASSOCIATION, INC. PAGE 1 1 Introduction This publication is one of a series compiled by
14、the Compressed Gas Association, Inc. to provide information on the production, transportation, handling, and storage of compressed gases, cryogenic liquids, and related products. 2 Scope and purpose 2.1 Scope This standard covers the storage and handling of calcium carbide in containers from the cal
15、cium carbide manu- facture to the point of use. 2.2 Purpose The purpose of this standard is to provide information on the safe storage and handling of calcium carbide and to provide background for training employees in the handling of calcium carbide. 3 General Information 3.1 Nomenclature Chemical
16、names: Calcium carbide Calcium dicarbide Common names: Calcium carbide Carbide Chemical formulas: CaC2 = Calcium carbide CaO = Calcium oxide, lime Ca(OH)2 = Calcium hydroxide, slaked lime, lime hydrate, carbide lime C2H2 = Acetylene 3.2 Physical properties Calcium carbide is a grey, brown, or black
17、granular solid that reacts with water to form acetylene and carbide lime. When crushed, calcium carbide is a rock-like solid with sharp, angular surfaces representing irregular fracture planes. The older the calcium carbide, the smoother these surfaces become due to reaction with mois- ture in the a
18、ir. Calcium carbide has a unique odor that has been described as garlic-like, due primarily to trace impurities given off when the calcium carbide reacts with atmospheric moisture. These impurities include phosphine, ammonia, hydrogen sulfide, and organic sulfides 1.1 Calcium carbide has a specific
19、gravity of 2.2. The bulk density of calcium carbide is approximately 67 lb/ft3 (1100 kg/m3), however it varies with particle size. Calcium carbide itself will not burn or explode. It is made in an electric furnace and is tapped from the furnace white hot at 3600 F (1980 C) into molds open to the air
20、. 3.3 Chemical properties Calcium carbide reacts readily with water, water moistened materials, or moisture in any form (fog, mist, spray or vapor) to form acetylene and calcium oxide. CaC2 + H2O C2H2 + CaO 1 References are shown by bracketed numbers and are listed in order of appearance in the refe
21、rence section. -,-,- PAGE 2 COMPRESSED GAS ASSOCIATION CGA G-1.72005 Excess water used during acetylene generation hydrates the calcium oxide to calcium hydroxide. CaO + H2O Ca(OH)2 Both reactions liberate heat and expand the volume of the reactants. The liberated heat and the alkalinity of the lime
22、 hydrate can irritate exposed skin, and the eyes, nose, or throat. For detailed information on carbide lime, see CGA G-1.5, Carbide LimeIts Value and Uses 2. Acetylene is a highly flammable gas with a wide range between the lower explosive limit (LEL) of 2.5% by vol- ume in air and the upper explosi
23、ve limit (UEL) of 82% by volume in air. An air mixture containing 30% acetylene by volume at atmospheric pressure can be ignited at about 581 F (305 C). Acetylene is slightly lighter than air (air = 1, acetylene = 0.906). Additional information on acetylene can be found in CGA G-1, Acetylene, and in
24、 Section 7 of this publication 3. 3.4 Typical grades Calcium carbide is crushed and sized in the following standard commercial grades in the United States and Canada shown in Table 1. Table 1Typical grades of calcium carbide Size range 14 ND rice 1/4 x 1/2 1/2 x 1/4nut egg Upper, inches 0.066 0.132
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- CGA 1.7 2005
链接地址:https://www.31doc.com/p-3752078.html