1、API STD 2555-66 24 April 1987 ADOPTION NOTICE This non-Government document was adopted on 24 April 1987 and is approved for use by the DOD. The indicated industry group has furnished the clearance required by existing regulations. Copies of the document are stocked by DOO Single Stock Point, Naval P
2、ublications and Forms Center, Philadelphia, PA 19120, for issue to DOD activities only. Contractors and industry groups must obtain copies from API, 1220 L Street, Northwest, Washington, DC 20005. Title of Document: Date of Specific Issue Adopted: Releasing Industry Group: Custodians: Army - ME Navy
3、 - YO Air Force - 99 Review Activities: Air Force - 82 DLA - CS User Activity: Navy - MC AMSC N/A Method for Liquid Calibration of Tanks September 1966 (No specific date of issue) American Petroleum Institute Military Coordinating Activity: Navy - YO (Project 5430-0165) FSC 5430 DISTRIBUTION STATEME
4、NT A. Approved for public release; distribution is unlimited. THIS DOCUMENT CONTAINS I PAGES. REAFFIRMED, MAY 2014Method for Liquid Calibration of Tanks Measurement Coordination/lndustry Affairs API STANDARD 2555 SEPTEMBER 1966 American Petroleum Institute API STD*2555 bb E 0732290 0097022 5 m SPECI
5、AL NOTES 1. API PUBLICATIONS NECESSARILY ADDRESS PROBLEMS OF A STANCES, LOCAL, STATE, AND FEDERAL LAWS AND REGULATIONS SHOULD BE REVIEWED. 2. API IS NOT UNDERTAKING TO MEET THE DUTIES OF EMPLOYERS, MANUFACTURERS, OR SUPPLIERS TO WARN AND PROPERLY TRAIN CERNING HEALTH AND SAFETY RISKS AND PRECAUTIONS
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9、VE API STANDARD OR, WHERE AN EXTENSION HAS BEEN GRANTED, UPON REPUBLICATION. STATUS OF THE PUBLICATION CAN BE ASCERTAINED FROM THE API AUTHORING DEPARTMENT MATERIALS IS PUBLISHED ANNUALLY AND UPDATED QUARTERLY BY API, 1220 L STREET, N.W., WASHINGTON, D.C. 20005. GENERAL NATURE. WITH RESPECT TO PARTI
10、CULAR CIRCUM- AND EQUIP THEIR EMPLOYEES, AND OTHERS EXPOSED, CON- SOMETIMES A ONE-TIME EXTENSION OF UP TO TWO YEARS WILL BE TELEPHONE (202) 682-8000. A CATALOG OF API PUBLICATIONS AND FOREWORD The standard in this publication is one of a series approved jointly by the American Petroleum Institute an
11、d the American Society for Testing and Materials. This standard is the result of a cooperative arrangement established by the two organizations to develop and jointly approve and publish standards dealing with quantitative and qualitative measurements of petroleum products and lubricants. The Americ
12、an Petroleum Institute and the American Society for Testing and Materials take no position as to whether any method, apparatus, or product mentioned herein is covered by an existing patent, nor as to the validity of any patent alleged to cover any such method, apparatus, or product. Furthermore, the
13、 information contained in this standard does not grant the right, by implication or otherwise, for manufacture, sale, or use in connection with any method, apparatus, or product covered by letters patent; nor does it insure anyone against liabihty for infringement of letters patent. This standard ma
14、y be used by anyone desiring to do so, but neither the American Petroleum Institute nor the American Society for Testing and Materials shall be held responsible or liable in any way either for loss or damage resulting therefrom, or for the violation of any federal, state, or municipal regulations wi
15、th which it may conflict. Suggested revisions are invited and should be submitted to the director of the Measurement Coordination Department, American Petroleum Institute, 1220 L Street NW, Washington, D.C. 20005. CONTENTS PAGE Scope . General Applications . Discussion of Procedure., . Equipment Pro
16、cedures . General Portable Tank Calibration Procedure Posit. ive Displacement Meter Procedurc . Stationary Tank Calibration Method Liquid-Weighing Procedurc . Example . APPENDIX 7 7 7 7 5 5 8 9 9 9 9 9 11 API STD*k2555 66 m 0732290 0097025 O m Standard Method for LIQUID CALIBRATION OF TANKS API Stan
17、dard: 2555 ASTM Designation: D 1406-65 ADOPTED, 19651. This standard of the American Petroleum Institute issued under the fixed designation APT 2555 is also a standard of the American Society for Testing and Materiale issued under the fixed designation D 1406; the final number indicates the year of
18、original adoption as standard, or, in the case of revision, the year of last revision. Thk method was adopted as a joint API-ASTM stmdard in 1965. Scope 1. This standa.rd describes the proce- dure for calibrating tanks, or portions of tanks, larger than a barrel or drum by in- troducing or withdrawi
19、ng measured quan- tities of liquid. NOTE 1.-Other calibration st.andarda are: API Standard 2660-ASTM D 12.W: Mea- surement and Calibration of Upright C;d- lindrical Tanks API Standard 2661-ASTM D 1410: Mea- surement and Calibration of HQ6ZOntal Tanks API Standard 2662-ASTM D 1408: Mea- surement and
20、Calibration of Spheres and Spheroids API Standard 2663-ASTM D l4W: Mea- surement and Calibration of Barges 1 Under the standardization procedures of the API and the ASTN, this standard is under the jurisdiction of the API Central Committee on Petroleum Measurement and the ASTM Com- mittee D-2 on Pet
21、roleum Producta nnd Lubri- cants. Stnndard 2555 in October, 1965. sfhe BPI method was adopted as API Prior to their present publication, the API as API Code 25. API Code 25 was reissued in methods of test were issued in December, 1929 1930, 1931, 1933, 1935, 1940, and 1948. The material mas revised
22、and reissued in September, 1955 as API Standard 2501, and the second edi- tion was issued in July, 1981. *Revised and adopted aa standard June, 1965, by action of the ASTM at the Annual Meeting and con5rming letter ballot. method was published as tentative in 1956. Prior to adoption as ASTM standard
23、, this API Standard 266 API Standard 25. API Standard 2545 “ASTM D 1086: Gaging PetroLum and Petroleum Produets; API Standard 2546-ASTM D 970: Sampling Petroleum and Petroleum Products; and API Stan- dard 1101: Measurement of Petroleum Liquid Hydrocarbons by Positive Dis- placement Meter. (c) Suitab
24、le forms for recording data. (d) When using the portable tank cali- bration procedure, one or more tanks. The sizerand number of tanks required are de- termined by the size of the tank to be cali- brated. These calibrating tanks must be calibrated to deliver by use of the National Bureau of Standard
25、s standard test mea- sure as outlined in API Standard 1101. (e) When using the positive displace- ment meter procedure, the meters selected should be of the proper size. The meters should be non-temperature-compensated, and they should be equipped with continu- ous correction-type calibrators rather
26、 than impulse-type calibrators. Generally the equipment required will include: meter prover tanks; air eliminators; strainers; pumps; pressure regulators; pressure gages; in-line thermometers, preferably of the recording type; quick-acting valves; and related pipe fittings. Meter installa- tion shou
27、ld be in accordance with the latest edition of API Standard 1101. PROCEDURES General 6. (a) The size of increments nill be determined by the size of the deadwood, the change in the shape of the tank, or the tank zone to be calibrated, (b) All hose and pipe connections should be tight. Arrangement sh
28、ould be made to elimimte the possibility of a,ir or vapor locks when piping is installed, Pip- ing must be tightly packed with calibrat- ing liquid before the test is started and remain packed throughout the calibration. (c) If a pump is used to transfer the liquid, caution should be observed to in-
29、 sure that the liquid level in the delivering t.ank will not be lowered to a point which will allow air to enter the system. The pump and its suction piping should be of appropriate size to avoid pulling a vacuum on the system. (d) If a meter is used, care should be exercised to avoid pulling vapor
30、or air through the meter. (The meter will register vapor or air as liquid.) (e) If the calibration is to be used to prepare a tank t,able, t.he job should be started and completed without interrup- tion, where possible. If the calibration is interrupted and the liquid level in either tank is changed
31、 due to temperature effect.s, the calibration operation may be resumed after applying the proper correction to the volume of each tank before continuing the operation. Applicable correction factors for the liquid used will be found in Table I of the Appendix of this.standard and in unabridged Table
32、6 of API Standard 2540 “ASTM D 1850: ASTM-IP Petroleum Measurement Tables. (i) Better results can be obtained when the ambient and liquid temperatures are about the same. (9) It is desirable to carry out the cali- bration as rapidly as possible so that tem- perature change will be small. (h) Accurat
33、e temperature determina- tions must be made of all volumes mea- sured. The number of temperature deter- minations required for any volume which is being measured depends on the quantity of liquid and the shape and size of the vessel containing the liquid. The tempera- ture used for the calibration m
34、ust be the average of all temperatures taken if more than one temperature determination is made. Normally, one temperature deter- mination in the center of the liquid volume will suffice for vessels of less than 1Wgal capacity. Two temperatures usually will be required on vessels of a capacity be- t
35、ween 100 and 500 gal, taken at the middle of the upper and lower halves of the liquid volumes. Three temperature determina- tions usually will be required on vessels of more than 500-gal capacity Baken at the midpoint of the upper, middle, and lower third portions of the liquid. If the height of the
36、 column of liquid representing 500 gal or more is less than 2 ft, one temperature determination at the midpoint will suffice. If the height of the column of liquid is greater than 2 ft and less than 3 ft, two temperature determinations should be taken. If the height of the liquid column is greater t
37、han 3 ft, three temperature deter- minations should be taken. Thermometers with divisions no greater than 0.5 F shall be used and temperatures should be read and recorded to t,he nearest 0.1 F. Whether gaged or metered, volumes at a. determined temperature when delivered into a tank must be adjusted
38、 to the temperature of the liquid measured in the tank that is being calibrated (see Table II, Appendix). (i) Atmospheric temperature and gen- eral weather conditions, such as wind and rain, should be recorded at the time the test is run. (i) Suggested minimum stops that should be made by any of the
39、 procedures used are as follows: (1) When liquid first hits hand gaging point. (Where the tank has a downward cone bottom, two gaging or striking p0int.s may be used.) (2) When tank bottom is completely covered. (S) At lower and upper limits of all deadwood. (4) When float gage floats freely, ad- ju
40、stment should be made with handline (5) At bottom edge and fully floating position of a floating roof, plus a sufficient number of intermediate stops to establish incremental values desired. (6) Every 3 or 6 in. up cylindrical por- tion of tank. (7) At top of each ring. (12) The following readings s
41、hould be (1) Handline gage of liquid in receiv- (W) Tank liquid temperature of receiv- (S) Meter reading or gage on delivery (4) Meter temperature or temperature (5) Automatic float gage, which has t,aken at each stop: ing tank. ing tank. tank. on delivery t,ank. been set when it first starts to flo
42、at. API STD*:2555 bb E 0732290 8097027 Y E LIQUID CALIBRATION OF TANKS (API 2555-ASTM D 1406) 9 (2) Handline gages should be read to nearest %e in. (0.01 or 0.005 ft by mutual agreement) , temperatures to nearest 0.1 F, and meter to 0.01 gal or 0.001 bbl. Portable Tank CalibrationProcednre 7. (a) Th
43、e calibration tank, or tanks, should be located as near as possible to the tank to be calibrated and set in a level position. All piping should be checked and tested before calibration is started, to in- sure a positive delivery from t.ank to tank. Lines should drain completely. A drainage time, as
44、recommended by the National Bureau of Standards, shall be used when the calibrating tanks are certified and shall be followed throughout the calibrating pro- cedure. This time period is established by waiting until the liquid stops pouring and begins to drip from the end of the pipe. The liquid shou
45、ld be allowed to drip for the same period of elapsed time after each run, as outlined in API St.andard 1101. The temperatures of t.he tank being cali- brated and the calibration tank should be taken before and after each fill, and vol- ume adjustment for change in tempera- ture should be made (see T
46、able II, Ap- pendix). (b) When liquid is to be introduced into the tank to be calibrated, the calibration tank, or tanks, should be full of liquid. The t,ank to be calibrated must be empty between the levels to be calibrated. The quick-acting valve on the calibrating tank, or tanks, should be opened
47、 and the liquid allowed to flow until the t,ank is empty. The run or fill number, the amount of fill, and the temperature should be entered on a record, report, or data sheet. The gage and the temperature of the receiving tank should be recorded at intervals necessary to determine incremental volume
48、s required for making the tank table. This informa- tion should be recorded on one data sheet if possible. A telephone circuit should be provided and all data recorded by one operator. The condition of fill of the piping system shall be the same at st,art and stop of each measurement, either com- pl
49、etely full or completely empty. Positive Displacement Meter Procedure 8. (a) The metering unit may be mounted on a trailer, skid platform, truok, or the like and located as near as possible to the tank to be calibrated. It should be installed on a firm footing in a level posi- tion. Connections, whether hose or piping, should be installed so that air traps will be eliminated. The system should then be purged of all air in the lines. The chosen operating pressure should be adjusted by means of the pressure regulator; the meter should be proved under simulated operat- ing conditions of
