1、DEUTSCHE NORM May 1994 I I Determination of cloud point of petroleum products English version of DIN EN 23015 (IS0 301 5 : 1992) DIN EN 23015 Beuth Verlag GmbH, Berlin, has the exclusive right of sale for German Standards(D/N-Normen). 11.94 DIN EN 23 O 15 Engl. Price group 6 Sales No. 1106 This stan
2、dard incorporates the English version of Is0 301 5. ICs 75.1 60.20 Minerallerzeugnisse; Bestimmung des Cloudpoints Supersedes DIN ISO3015, October 1982 edition. European Standard EN 23015:1994 has the status of a DIN Standard. A comma is used as the decimal marker. National foreword This standard ha
3、s been published in accordance with a decision taken by CENTTC 19 to adopt, without alteration, Interna- tional Standard IS03015 as a European Standard. The responsible German body involved in the preparation of this standard was the Normenausschu Materialprfung (Materials Testing Standards Committe
4、e). It should be noted that DIN 12785 - BST 1/-80/20 or DIN 12785 - BST 1/-38/50 thermometers may also be used (cf. clause 4.2). Previous editions DIN DVM 3662 = DIN 53662: 02.36; DIN 51 583: 08.55, 08.59, 10.62; DIN 51 772: 11.53, 06.59; DIN 51 597: 06.65, 01.72: DIN IS0 3015: 10.82. Amendments IS0
5、 301 5 : 1992 having been adopted as a European Standard, the status of the corresponding DIN Standard (DIN IS0 3015) has been changed accordingly. Changes have been made to the method in the following points. a) Information on the diameter and the mark of the test jar (4.1) has been included. b) Th
6、e scale length of the thermometer (4.2) has been specified. c) The material to be used for the jacket is metal and no longer glass. d) Subclause 5.1: A maximum sample temperature of 49 “C has been specified. Subclause 5.3: The thermometer is now to be changed at -36 OC (instead of -38 OC). Subclause
7、 5.6: Table 2 specifying the bath and sample temperature ranges has been included. International Patent Classification C 10 M 171/00 C 10 L 001/04 G O1 N 033/24 EN comprises 6 pages. EUROPEAN STANDARD NORME EUROPENNE EUROPAISCHE NORM EN 23015 March 1994 UDC 665.7.035.2 Descriptors: Petroleum product
8、s, liquid fuels, cloud point, determination. English version Petroleum products (IS0 301 5 : 1992) Determination of cloud point Produits ptroliers; dtermination du point de trouble (IS03015:1992) Minerallerzeugnisse; Bestimmung des Cloud points (IS0 301 5 : 1992) This European Standard was approved
9、by CEN on 1994-03-16 and is identical to the IS0 Standard as referred to. CEN membersare bound tocomply with the CENKENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliograph
10、ical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN
11、 member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain,
12、 Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, 8-1050 Brussels O 1994. Copyright reserved to all CEN members. Ref. No. EN 23015:1994 E Page 2 EN 23015:1994 Fore
13、word This European Standard has been taken over by Technical Committee CENTTC 19 Methods of test and specifications for petroleum products from the work of ISOTTC 28 Petroleum products and lubricants of the International Organization for Standardization (ISO). This European Standard shall be given t
14、he status of a national standard, either by publication of an identical text or by endorsement, and conflicting national standards withdrawn, by September 1994 at the latest. In accordance with the CENKENELEC Internal Regulations, the following countries are bound to implement this European Standard
15、: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of the International Standard IS0 301 5: 1992 was approved by CEN as a European Standard witho
16、ut any modification. Page 3 EN 2301 5: 1994 WARNING - The use of this International Standard may involve hazardous materials, operations and equipment. This standard does not purport to address all o the safety prablems associated with its use. It is the responsibility of the user of this standard t
17、o establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 1 Scope This International Standard specifies a method for the determination of the cloud point of petroleum products which are transparent in layers 40 mm in thickness and hav
18、e a cloud point below 49 “C. 2 Definition For the purposes of this International Standard, the following definition applies. 2.1 cloud point: The temperature at which a cloud of wax crystals first appears in a liquid when it is cooled under specified conditions. 3 Principle A sample is cooled at a s
19、pecified rate and exarnined periodically. lhe temperature at which a cloud is first observed at the bottom of the test jar is re- corded as the cloud point. 4 Apparatus (see figure 1) 4.1 Test jar, cylindrical, of clear glass, flat- bottomed, 33,2 rnrn to 34,8 rnm in outside diameter and 115 mni to
20、125 mrn in height. The inside diameter of the jar may range from 30 mm to 32,4 mm, within the constraint that the wall thickness be no greater than 1,6 mrn. The jar shall be marked with a line to indicate a sample height 54 mm rt 3 mm above the inside bottom. 4.2 Thermometers, partial-immersion type
21、, con- forming to the specifications in table 1. 4.3 Cork, to fit the test jar, bored centrally to take the test thermometer. 4.4 Jacket, watertight, cylindrical, metal, flat- bottomed, about 115 rnm in depth, with an inside di- ameter of 44,2 rnm to 45,8 rnrn. It shall be supported in a vertical po
22、sition in a cooling bath (4.7) so that not more than 25 mm projects out of the cooling medium, and it shall be capable of being cleaned. 4.5 loosely inside the jacket. Disc, of cork or felt, 6 mm in thickness, to fit 4.6 Gasket, ring form, about 5 mni in thickness, to fit snugly on the oiitside of t
23、he test jar and loosely inside the jacket. This gasket may be made of rubber, leather or other suitable material, elastic enough to cling to the test jar and hard enough to hold its shape. The purpose of the ring gasket is to prevent the test jar from touching the jacket. Page 4 EN 23015:1994 I - :.
24、 Thermometers Cork A m- w:.:.:. :.: it t i i . : Coolant 4i - i level -. . . Test Jar - Jacket - Gasket - T 0 Int. 45.8 0 Int. 44.2 d ext. 3418 0 ext. 332 (b Int. 32.4 0 Int. 30.0 E I $r Dimensions in millimetres DISC Coollng bath Figure 1 - Apparatus for cloud-point test Page 5 EN 2301 5: 1994 - 12
25、 OC: crushed ice and sodium chloride crystals Table 1 - Specifications of thermometers - 26 “C: crushed ice and calcium chloride crystals Specification Range ,inmer sion length 3aduation at each Longer lines at each Figured at each scale error not lo exceed Expansion chamber: heating permitted to 3v
26、erall length Stem diameter Bulb length Bulb diameter Distance from bottom of bulb to line at Length of scale High clwd and pour - 38 oc to -1- 50 “C 108 mm 1 oc 5 OC 10 “C 0,5 C 100 oc 230 mm f 5 nim 6 mm to 8 mim 7,O mm to 10 nim 5.5 mm min, but not greater than stem diarn- eter - 38 “C : 120 mm to
27、 130 mm 65 mm to $5 mm Low cloud and pour - 80 oc to + 20 “C 76 mm 1 C 5 OC 10 “C 1 C down to 2 “C below - 33 “C 60 “C - 33 oc, 230 mm f5mm 6 nim to 8 min 7,O mm to 10 inm 5,O mm min, but not greater thari stem diam- etcr -70T: 100 min to 120 mm 70 mm to 100 mm NOTE - lhe emergent-stem temperature i
28、s 21 OC throughout the scale range. 4.7 Cooling baths, of a type suitable for obtaining the required temperatures. The size and shape of the baths are not specified, but a support to hold the jackets firmly in a vertical position is essential. The bath temperature shall be monitored by means of a hi
29、gh or low cloud and pour thermometer immersed to the correct immersion depth. For the determination of cloud points below 10 OC, two or more baths are needed. The required bath temperatures may be maintained by refrigeration or by suitable freezing mixtures. NOTE 1 follows: The freezing mixtures com
30、monly used are as For cloud-point temperatures down to 10 OC: ice and water - 57 OC: solid carbon dioxide and acetone or pet- roleum naphtha. The CO,-based mixture may be made as follows: In a covered metal beaker, chill a suitable amount of acetone or petroleum naphtha to - 12 OC, or lower, by mean
31、s of an icelsalt mixture. Then add enough solid carbon dioxide io the chilled acetone or pet- roleum naphtha to give the desired temperature. Solid carbon dioxide is commercially available in many areas. 5 Procedure 5.1 Bring the sample to be tested to a temperature at least 14 “C above the approxim
32、ate cloud point, but not above 49 “C. Remove any moisture present by any suitable method, such as filtration through dry lintless filter paper, until the sample is perfectly clear, working at a temperature of at least 14 “C above the approximate cloud point, but not above 49 OC. 5.2 Pour the clear s
33、ample into the test jar (4.1) to the level mark. 5.3 Close the test jar tightly by the cork (4.3) carrying the appropriate test thermometer (see 4.2). Use the high cloud and pour thermometer if the expected cloud point is at or above 36 OC and the low cloud and pour thermometer if the expected cloud
34、 point is below - 36 OC. Adjust the position of the cork and the thermometer so that the cork fits tightly, the thermometer and the jar are coaxial, and the thermometer bulb is resting on the bottom of the jar. Liquid-column separation of thermometers oc- casionally occurs and may escape detection. Tlier- mometers shall therefore be checked immediately prior to the test and used only if the ice point is O OC a reference to this International Standard; the result of the test (see 5.7); the date of test.
