CGSB 3 0 NO 18 5-06-CAN CGSB-2006 Methods of Testing Petroleum and Associated Products Test for Ethyl Mercaptan Odorant in Propane, Field Method《石油和相关产品试验方法.pdf

1、Government of Canada Gouvernement du Canada CAN/CGSB-3.0 Canadian General Office des normes No. 18.5-2006 Standards Board gnrales du Canada Supersedes CAN/CGSB-3.0 No. 18.5-2005 Methods of Testing Petroleum and Associated Products Test for Ethyl Mercaptan Odorant in Propane, Field Method ICS 71.040.

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22、mitted without license from IHS-,-,-NATIONAL STANDARD OF CANADA CAN/CGSB-3.0 No. 18.5-2006 Supersedes CAN/CGSB-3.0 No. 18.5-2005 METHODS OF TESTING PETROLEUM AND ASSOCIATED PRODUCTS TEST FOR ETHYL MERCAPTAN ODORANT IN PROPANE, FIELD METHOD Prepared by the Approved by the Canadian General Standards B

23、oard Standards Council of Canada Published April 2006 by the Canadian General Standards Board Gatineau, Canada K1A 1G6 HER MAJESTY THE QUEEN IN RIGHT OF CANADA, as represented by the Minister of Public Works and Government Services, the Minister responsible for the Canadian General Standards Board,

24、2006). No part of this publication may be reproduced in any form without the prior permission of the publisher. Copyright Canadian General Standards Board Provided by IHS under license with CGSBNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-CANADIAN GENERAL STAND

25、ARDS BOARD COMMITTEE ON PETROLEUM TEST METHODS (Membership at date of approval) Wispinski, D. Chairperson Alberta Research Council Gaudet, N. National Defence Jacula, T. Maxxam Analytics Inc. Kerwin, M. Suncor Energy Products Inc. Lee, S.W. Natural Resources Canada McRae, M. Canadian Redwood Managem

26、ent Mathoney, B.J. Imperial Oil, Products and Chemicals Division Pickard, A.L. Consultant Porter, S. Marc-IV Consulting Purificati, D. Petro-Canada Samiullah, M. Sentinel Canada Turle, R. Environment Canada Wutzke, K.R. Shell Canada Products Newman, M. Secretary Canadian General Standards Board Ackn

27、owledgment is made for the translation of this National Standard of Canada by the Translation Bureau of Public Works and Government Services Canada. CAN/CGSB-3.0 No. 18.5-2006 Copyright Canadian General Standards Board Provided by IHS under license with CGSBNot for ResaleNo reproduction or networkin

28、g permitted without license from IHS-,-,-National Standard of Canada Canada METHODS OF TESTING PETROLEUM AND ASSOCIATED PRODUCTS CAN/CGSB-3.0 Gatineau K1A 1G6 Test for Ethyl Mercaptan Odorant in Propane, Field Method No. 18.5-2006 Supersedes CAN/CGSB-3.0 No. 18.5-2005 1. SCOPE 1.1 This method is int

29、ended for the semi-quantitative (i.e., 25%1) determination of ethyl mercaptan odorant (within the range of 5 to 85 mg/L) in liquid propane. It is important to confirm that recently stenched propane is odorized to the required level. The method is intended for field application and may be suitable fo

30、r use by non-laboratory personnel after suitable training. A gas chromatographic method should be used for more precise, quantitative determination of ethyl mercaptan in propane. 1.2 Other low molecular weight mercaptans, such as methyl mercaptan, can interfere by giving a positive result. 1.3 The p

31、rimary stain tube described in this method is suitable for Grade 1 propane but is not suitable for Grade 2 (commercial) propane, which normally contains more than 5% propylene by volume. 1.4 The testing and evaluation of a product against this method may require the use of materials and/or equipment

32、 that could be hazardous. This document does not purport to address all the safety aspects associated with its use. Anyone using this method has the responsibility to consult the appropriate authorities and to establish appropriate health and safety practices in conjunction with any applicable regul

33、atory requirements prior to its use. 2. REFERENCED PUBLICATIONS 2.1 The following publications are referenced in this method: 2.1.1 Canadian General Standards Board (CGSB) CAN/CGSB-3.14 Liquefied Petroleum Gas (Propane). 2.1.2 Canadian Standards Association (CSA) CAN/CSA-B149.2 Propane Storage and H

34、andling Code. 2.1.3 ASTM International D 1265 Standard Practice for Sampling Liquefied Petroleum (LP) Gases (Manual Method) D 5305 Standard Test Method for Determination of Ethyl Mercaptan in LP-Gas Vapor E 29 Standard Practice for Using Significant Digits in Test Data to Determine Conformance with

35、Specifications. 2.2 A dated reference in this method is to the issue specified. An undated reference in this method is to the latest issue, unless otherwise specified by the authority applying this method. The sources are given in the Notes section._ 1See par. 10.1. The precision statement has not b

36、een determined by formal round robin. 1 Copyright Canadian General Standards Board Provided by IHS under license with CGSBNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3. SUMMARY OF TEST METHOD 3.1 A representative sample of liquid propane is completely vaporized

37、 by one of two procedures (a flowing stream of gaseous propane or evaporation of a sample in a plastic bag) and then tested for odorant concentration by use of a hand-held tester that utilizes a detector tube (stain tube) specific for ethyl mercaptan. 4. SIGNIFICANCE AND USE 4.1 Propane, a colourles

38、s, odourless gas, is intentionally treated with an odorant, ethyl mercaptan, to allow propane leaks to be detected. However, the concentration of ethyl mercaptan in propane may decrease (fade) over time because of adsorption on metal surfaces and oxidation, leading to odorant depletion. Therefore, a

39、 field test is required to confirm the concentration of odorant in recently stenched propane and to allow determination of ethyl mercaptan in propane in the distribution system. 5. PRECAUTIONS 5.1 Note the extreme flammability of propane and ensure that this test is performed in a well-ventilated ar

40、ea, free of ignition sources. 5.2 Liquid propane evaporates rapidly and can readily freeze flesh. Avoid skin contact. 6. APPARATUS AND MATERIALS 6.1 Gastec precision gas sampling pump: GV-100 or GV-100S or equivalent, incorporating a “test complete” indicator. 6.2 Gastec ethyl mercaptan detector tub

41、e: No. 72 calibrated over the range of 0.5 to 120 mL/m3, or equivalent. 6.3 Sample container: (i.e. pressure cylinder), suitable for collecting and holding liquid propane, and conditioned by prior exposure to propane odorized with expected levels of ethyl mercaptan to minimize adsorption of ethyl me

42、rcaptan from the sample. A sample cylinder of at least 500 mL capacity is required for Procedure A. The following sample cylinders (with outage tube and resettable pressure-relief safety valve with monel spring) have been found to be suitable: 6.3.1 Silcosteel-treated, Sulfinert-treated2 or Teflon-l

43、ined stainless steel pressure cylinders. 6.3.2 316 stainless steel pressure cylinders dedicated to stenched propane service. Initial commissioning of new or cleaned/reconditioned steel cylinders should include charging the cylinder with stenched propane, storing for at least 24 h, and repeating this

44、 charging/storing process at least five times.Note: Sample cylinders for stenched propane service should not routinely be left open to the atmosphere or cleaned (e.g. steam cleaning). A cylinder that has been exposed to oxygen or water (vapour) must be recommissioned as described in par. 6.3.2. 6.4

45、Vaporization device: depending on the particular sample preparation method chosen: 6.4.1 Heating bath (40 to 50C very hot tap water) with 3 m of coiled 3 mm stainless steel tubing (par. 11.2), fittings for sample cylinder, a flow meter (optional) and control valve (Figure 1) or 6.4.2 Polyethylene fr

46、eezer/food storage bags, nominally 20 to 35 cm per side (large size), equipped with a resealable closure (Ziploc or “zipper” type) capable of holding a gas-tight seal after the bag is filled while the contents are warmed to near room temperature in preparation for the stain tube determination._ 2 Si

47、lcosteel and Sulfinert-treated stainless steel pressure cylinders are available from Restek Corporation, 110 Benner Circle, Bellefonte, PA 16823, U.S.A., telephone 1-800-356-1688 or (814) 353-1300, fax (814) 353-1309. Alternatively, pressure cylinders can be provided to Restek Corporation to receive

48、 the Silcosteel or Sulfinert treatment. No. 18.5-2006 2 Copyright Canadian General Standards Board Provided by IHS under license with CGSBNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Three-way valve Test port 3 mm stainless steel tube, coiled Needle control valv

49、e liquid propane Gastec tester Flow meter Heating bath, 45 to 50C Sample cylinder with FIGURE 1Apparatus for Procedure A Flowing Propane Gas Stream AnalysisNo. 18.5-2006 3 Copyright Canadian General Standards Board Provided by IHS under license with CGSBNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-6.4.