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1、a J I S B*8312 91 4933608 0504Lb2 4b0 = UDC 621.664.001.4:621.665.001.4 JIS h o h a JAPANESE INDUSTRIAL STANDARD Gear pumps and screw pumps - Testing methods JIS B 8 3 1 2 - 1 9 9 1 Translated and Published by Japanese Standards Association 9 s Printed in Japan Copyright Japanese Standards Associati
2、on Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 03:48:52 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S Bt8312 91 4933bO8 0504363 3T7 = In the event of any doubt arising, the original Standard i
3、n Japanese is to be final authority. A Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 03:48:52 MDTNo reproduction or networking permitted without license from IHS -,-,- JIS BX83L2 91 W 493
4、3b08 05041Ls4 233 W UDC 621.66.001.4:621.665.001.4 JAPAN ES E INDUSTRIAL STAN DARD J I S Gear pumps and screw pumps - B 8312-1991 Testing methods 1. Scope This Japanese Industrial Standard specifies the testing and inspecting methods at manufactories of gear pumps, screw pumps or positive displaceme
5、nt rotary pumps corresponding to those pumps (hereafter referred to as the “pumps“). However, this will not be applicable to a pump which constitutes a part of a machine. The range of a pump is the part which has been partitioned by the sections of suction flange and discharge flange of the pump. Re
6、marks 1. The applicable standards to this Standard shall be as given in the following: JIS B 8301 Testing Methods for Centrifugal Pumps, Mixed Flow Pumps and Axial Flow Pumps JIS B 8302 Measurement Methods of Pump Discharge JIS F 0504 Application and Setting Pressure of Relief Valves for Ships Machi
7、nery 2. In this Standard, numerical values and units given in accordance with the traditional units, and are given for informative reference. are in 2. Test items and inspection items 2.1 following. required. Test items The test items of the pumps shall be as given in the However, the test items of
8、( 1) (b), (2) and (3) (b) shall be tested when ( 1) Performance tests (a) Total pressure, discharge rate, speed of rotation, shaft power, and operational conditions. (b) Suction conditions (2) Continuous test (3) Special tests (a) Working conditions of relief valve (b) Start-up 2.2 the following. Ho
9、wever, the inspection items of (2) shall be inspected when required. Inspection items The inspection items of the pumps shall be as given in Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007
10、03:48:52 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S Bx8312 91 m 4733608 050qLb5 L7T m 2 B 8312-1991 (1) Total pressure and discharge rate, shaft power, pump efficiency, operational conditions, working conditions of relief valve, and hydraulic pressure resistance.
11、 (2) Suction conditions and start-up 3. Test conditions 3.1 Testing liquid The testing liquid shall be the designated liquid. However, in the case where it is difficult to test by the designated liquid, a similar liquid in physical properties such as kinematic viscosity and the like may be used for
12、testings as agreed between the parties concerned (hereafter referred to as the “agreement“). (1) In the case where the density of the testing liquid differs from that of the designated liquid, test results thereof shall be converted in accordance with. 6.2. (2) In the case where the kinematic viscos
13、ity of the designated liquid is high or the designated liquid contains solid substances, performance values by the test liquid shall be agreed in advance. 3.2 Test speed of rotation The test speed of rotation shall be as given in the following: (i) It is preferable to employ the specified speed of r
14、otation as the test speed of rotation. (2) In the case where the specified speed of rotation is not obtained on account of the test equipment, the test may be carried out at a different speed of rotation in the range of f 5 % with respect to the specified speed of rotation. In this case, test result
15、s shall be converted into the performance values of specified speed of rotation in accordance with 6.1. (3) In the case of attached electric motor driving, the speed of rotation as it is, when a pump has been driven under the specified load in a normal source conditions ( I ) , shall be considered t
16、o be the specified speed of rotation of the pump. Note ( 1 The source conditions within the ranges of i 1 % with respect to the specified frequency and i 10 % with respect to the specified voltage. 3.3 Measurin point Measurements shall be carried out on various discharge pressures + o 5 kinds or mor
17、e including conditions of fully opened discharge valve and the specified discharge pressure. In the case where it is required to test by changing speeds of rotation, measurements shall be carried out by changing speeds of rotation as required after the test at the specified maximum speed of rotation
18、 has been carried out. 4. Test eauiment The test equipment shall be in accordance with the following: e a e Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 03:48:52 MDTNo reproduction or ne
19、tworking permitted without license from IHS -,-,- J I S R+B312 91 = 4933608 05041bb 006 3 B 8312-1991 The test equipment shall be such that it is capable of carrying out tests under similar conditions to the specifications specified by the purchaser and capable of measuring required data for express
20、ing the performances and operational conditions of a pump. The test equipment and arrangement of measuring devices should preferably be in accordance with Fig. 1 or Fig. 2. Furthermore, in the case of a viscous liquid, if air bubbles are once generated in it, it is difficult to be eliminated and the
21、y affect the pump performances, so the equipment shall be so designed to prevent the generation of air bubbles. Fig. 1. Test equipment using mass concentration method or volumetric method Switching device ; Heating cooling Pump to be tested Fig. 2. Test equipment using flow meter Flow meter Tank 4 H
22、eating or cooling device T hermometer - - Pump to be tested The prime mover to be coupled with the pump shall be the attached electric motor. attached electric motor or in the case of the pump which is driven by a prime mover other than the electric motor, an electric motor for testing may be used u
23、pon the agreement. However, in the case where the test is not possible by the Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 03:48:52 MDTNo reproduction or networking permitted without lic
24、ense from IHS -,-,- J I S EX8312 91 D 4933608 05041b7 T42 D 4 B 8312-1991 5. Test methods 5.1 Performance tests 5.1.1 General The performance tes,; shall be carried out under similar conditions to the designated ones. liquid, information of the values of kinematic viscosity corresponding to the temp
25、erature of the test liquid are prepared in advance, liquid temperatures are measured near the suction flange of pump of the suction piping, and during testing it should be preferable to keep the temperature so that the kinematic viscosity similar to the specified one is maintained. For this purpose,
26、 in the case of a viscous 5.1.2 Total pressure The test of total pressure shall be in accordance with the following: (1) Measuring instruments The measuring instruments shall be in accordance with 5.2.1 (Measuring instruments) of JIS B 8301. (2) Measurements The measurements shall be in accordance w
27、ith 5.2.2 (Measurements) of JIS B 8301. (3) Calculation The total pressure shall be expressed by the difference between the discharge pressure and the suction pressure with respect to the pump reference plane, and be calculated from the following formula: where, p : total pressure (MPa) kgf/cm2) pd
28、: discharge pressure converted with respect to reference plane (MPa) kgf/cmz 1 P, : suction pressure converted with respect to reference plane (MPa) kgf/cm2) Gd : indication of discharge pressure gauge (MPa) kgf/cm21 G : indication of suction pressure gauge or vacuum gauge (MPa) (kgf/cmz) However, i
29、n the case of the vacuum gauge, G shall ,e a negative value. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 03:48:52 MDTNo reproduction or networking permitted without license from IHS -,-
30、,- J I S B*8312 91 m 4933b08 0504Lb8 989 m 5 B 8312-1991 Remarks 1. Zi : height difference of measuring point at discharge-side (m) Vertical distance between the centre of discharge-side pressure gauge and the reference plane. When the pressure gauge is located lower than the reference plane, z , sh
31、all be a negative value. : height difference of measuring point at suction side (m) In the case of a vacuum gauge, the vertical distance between the pressure measuring hole and the reference plane. When the pressure measuring hole is located lower than the reference plane, Z, shall be a negative val
32、ue. In the case of a pressure gauge, the vertical distance between the centre of pressure gauge and the reference plane of pump. than the reference plane, z shall be a negative value. When the pressure gauge is located lower P : density of liquid kg/m3) 9 : acceleration of free fall. 9.80 m/s2 y : m
33、ass per unit volume of liquid (kgfil) Even in the case where the diameters of suction opening and discharge opening of a pump are different, as the difference between the dynamic pressures thereof is small, it shall be omitted. 2. 3. In the case where e ( Z i - Z ) is not more than pressure, it may
34、also be omitted. the total The reference plane of a pump shall be the horizontal plane including the contacting point of gear circular pitch or the centre of shaft on the main screw for a horizontal shaft pump, and be the horizontal plane including the face width of gear or the centre of the length
35、of screw for a vertical shaft pump. t I 5.1.3 Discharge rate The test of discharge rate shall be in accordance with 5.3 (Discharge rate) of JIS B 8301. shall be in accordance with 6. (Measuring method by a vessel) of JIS B 8302, or shall be made by using an instrument suitable to the flow rate measu
36、rement of the testing liquid. periodically in accordance with 6. (Measuring method by a vessel) of JIS B 8302 using the testing liquid. However, the measurement of discharge rate In the case of the other instrument, it shall be calibrated Furthermore, the unit of discharge rate shall be expressed by
37、 m3/min or kg/min. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 03:48:52 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S Bx8312 91 4933608 05041b9 815 M 6
38、 B 8312-1991 5.1.4 Speed of rotation The measurement of speed of rotation shall be in accordance with 5.4 (Speed of rotation) of JIS B 8301. 5.1.5 Shaft power The measurement of shaft power shall be in accordance with 5.5 (Shaft power) of JIS B 8301. 5.1.6 Suction conditions In the test of suction c
39、onditions, potentials of decrease in discharge rate and of abnormal noises which may be found at the time of occurrence of cavitation shall be examined by the discharge rate ( 2 ) under the specified total pressure. Furthermore, in the case where the suction pressure at the time in service is design
40、ated and if particularly required to test under the same condition, test shall be made maintaining the suction pressure at the specified value. However, in the case where the testing liquid differs from the designated liquid, the suction pressure shall be determined upon an agreement. Note ( 2 ) Eve
41、n in the case where the test speed of rotation differs from the specified speed of rotation, this shall be the discharge rate under the specified total pressure. Remarks: In the case where a required NPSH is to be obtained by designation particularly, the value of NPSH, when the discharge rate under
42、 the specified total pressure has decreased by 3 % with respect to that at the time of normal running, shall be considered to be the required NPSH. 5.1.7 Operational conditions The test of operational conditions shall be in accordance with 5.7 (operational conditions) of JIS B 8301. 5.2 Continuous t
43、est In the continuous test including performance test, the pump shall be operated for about 1 h at the specified maximum speed of rotation and under the specified discharge pressure, and its operation conditions shall be examined. 5.3 Special tests 5.3.1 Working conditions of relief valve During tes
44、t running, it shall be ascertained that the working of relief valve is reliable by opening and closing the discharge valve. Furthermore, .the pressure and the load of the prime mover also, when the In addition, that provided with a pressure control valve shall be ascertained of discharge valve has b
45、een closed fully, shall be examined. its pressure control performance. Start-up For a pump required start-up, it shall be ascertained that the liquid is being lifted, by adjusting the suction side piping and the piping adjacent to the discharge side nearly to the designated conditions and by startin
46、g up at the specified minimum speed of rotation after letting the liquid at the suction and discharge sides evacuate, or the conditions of negative pressure shall be ascertained for 30 s by throttling the suction valve to run at the specified minimum speed of rotation. 5.3.2 Copyright Japanese Stand
47、ards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 03:48:52 MDTNo reproduction or networking permitted without license from IHS -,-,- JIS B*&312 73 m 4733bO 0504370 537 m 7 B 8312-1991 6. Conversions where speed of r
48、otation, density and kinematic viscosity are different 6 . 1 In the case of different speed of rotation In the case where a pump has been tested at the speed of rotation of pump other than the specified speed of rotation, the results shall be converted in accordance with the following. Discharge rate at specified speed of rotation Shaft power at specified speed of rotation = discharge rate at test speed of rotation x = shaft power at specified test speed of rotation x z where, n : specified speed of rotation nt : test speed of rot