GB/T 17491-2011 English PDF (GBT17491-2011)

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GB/T 17491-2011: Hydraulic fluid power -- Positive displacement pumps, motors and integral transmissions -- Methods of testing and presenting basic steady state performance
GB/T 17491-2011
GB
NATIONAL STANDARD OF THE
PEOPLE'S REPUBLIC OF CHINA
ICS 23.100.10
J 20
Replacing GB/T 17491-1998
Hydraulic fluid power - Positive capacity pumps,
motors and integral transmissions - Methods of
testing and presenting basic steady state performance
(ISO 4409.2007, MOD)
ISSUED ON. JUNE 16, 2011
IMPLEMENTED ON. MARCH 01, 2012
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3 
Introduction ... 5 
1 Scope ... 6 
2 Normative references ... 6 
3 Terms and definitions ... 7 
4 Symbols and units ... 11 
5 Test ... 12 
6 Result expression ... 22 
7 Indication explanation ... 25 
Appendix A (Informative) Practical unit application ... 26 
Appendix B (Normative) Error and measurement accuracy classes ... 28 
Appendix C (Informative) Checklist before test ... 30 
Foreword
This Standard was drafted in accordance with the rules specified in GB/T 1.1-
2009.
This Standard replaces GB/T 17491-1998 "Hydraulic pumps, motors and
integral transmissions - Measurement of steady-state performance". As
compared with GB/T 17491-1998, the main technical changes are as follows.
- ADD the integral transmission test circuit;
- DELATE the test curves of hydraulic pumps, motors and integral
transmission.
Using re-drafting method, this Standard modifies and adopts ISO 4409.2007
“Hydraulic fluid power - Positive capacity pumps, motors and integral
transmissions - Methods of testing and presenting basic steady state
performance” (English version).
The technical differences between this Standard and ISO 4409.2007 AND their
causes are as follows.
- In normative references, this Standard has made adjustments with
technical differences to adapt to China’s technical conditions. The
adjustments are mainly reflected in Chapter 2 "Normative references".
The specific adjustments are as follows.
● USE GB 3102 (all parts) which equivalently adopts international standard
to replace ISO 31 (all parts) (see 4).
● USE GB/T 786.1 which equivalently adopts international standard to
replace ISO 1219-1 (see 4).
● USE GB/T 17446 which equivalently adopts international standard to
replace ISO 5598 (see 3).
● USE GB/T 17485 which equivalently adopts international standard to
replace ISO 4391 (see 4).
● USE JB/T 7033 which adopts international standard through modification
to replace ISO 9110-1 (see 5.1.1).
- CORRECT the unit error of “Rotational frequency” in Table 1 of international
standard.
Hydraulic fluid power - Positive capacity pumps,
motors and integral transmissions - Methods of
testing and presenting basic steady state performance
1 Scope
This Standard specifies the measurement method for the steady state
performance and efficiency of positive capacity pumps, motors and integral
transmissions for the purposes of hydraulic transmission, as well as, under
steady state conditions, the expression of the test apparatus, the test program
requirements and test results.
This Standard applies to the positive capacity hydraulic pumps, motors and
integral transmissions.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this Standard.
GB/T 786.1 Fluid power systems and components - Graphic symbols and
circuit diagrams - Part 1. Graphic symbols for conventional use and data-
processing applications (GB/T 786.1-2009, ISO 1219-1.2006, IDT)
GB 3102 (all parts), Quantities and units [GB 3102-1993, eqv ISO 31.1992
(all parts)]
GB/T 17446 Fluid power systems and components - Vocabulary (GB/T
17446-1998, idt ISO 5598.1985)
GB/T 17485 Hydraulic fluid power - Pumps, motors and integral
transmissions - Parameter definitions and letter symbols (GB/T 17485-1998,
idt ISO 4391.1983)
JB/T 7033 Hydraulic fluid power - General measurement principles (JB/T
7033-2007, ISO 9110-1.1990, MOD)
ISO 9110-2 Hydraulic fluid power - Measurement techniques - Part 2.
Measurement of average steady state pressure in a closed conduit
3 Terms and definitions
The terms and definitions as defined in GB/T 17446 as well as the followings
apply to this document.
NOTE. When it is no risk of ambiguity, the subscripts P, M and T used to distinguish pumps,
motors or integral transmissions can be omitted.
3.1
Volume flow rate qV
It refers to the volume of fluid flowing through the channel’s cross section in
unit time.
3.2
Drainage flow rate qVd
It refers to the volume flow rate from the component casing.
3.3
Pump effective outlet flow rate
It refers to, at the temperature of θ2,e and pressure of p2,e, the actual flow rate
measured at the pump outlet.
NOTE. If the flow rate is measured at other locations than the pump outlet, then at the
temperature of θ and pressure of p, the measured flow rate shall be corrected by the
equation (1), so as to obtain the effective outlet flow values.
3.4
Motor effective inlet flow rate
It refers to, at the temperature of θ1,e and pressure of p1,e, the actual flow rate
measured at the motor inlet.
3.14
Pump overall efficiency
It refers to the ratio between the power obtained and the input mechanical
power when the liquid passes through pump.
3.15
Pump volumetric efficiency
It refers to, under specified conditions, the ratio between the pump actual
output flow rate and the product of derived capacity Vi and shaft speed.
3.16
Motor overall efficiency
It refers to the ratio between the motor output mechanical power and the
input hydraulic power.
3.17
Motor volumetric efficiency
It refers to, under specified conditions, the ratio between the product of motor
derived capacity Vi and shaft speed n and the actual input flow rate.
3.18
Motor hydro-mechanical efficiency
It refers to the ratio between motor shaft torque and motor theoretical torque.
b 1Pa = 1N/m2.
5 Test
5.1 Requirements
5.1.1 Overview
Test equipment shall be designed to prevent air entrainment, AND be able to
exclude all free air from the system before testing.
The installation, connection and operation of the test unit in the test circuit shall
comply with the manufacturer's requirements, see Appendix C.
It shall record the ambient temperature in the test area.
In the test circuit, it shall equip with filter which complies with the filter criteria
as required by the test unit manufacturer, AND it shall indicate the location and
quantity of the filters used in the test circuit as well as the model of each filter.
When conducting pressure measurement in the pipelines, it shall meet the
requirements of JB/T 7033 and ISO 9110-2.
When conducting temperature measurement in the pipelines, the temperature
measurement point shall be kept away from the components AND meanwhile
away from the pressure measurement point for 2 times ~ 4 times of the pipeline
diameter.
Figure 1 to Figure 4 show the basic circuit, in which the safety device is not
equipped to avoid system damage when the system fails. During the test, it
shall take safety measures to prevent personnel and equipment from being
ha...