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This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces JB/T 8644-2007 Single screw pumps, and the following main technical changes have been made with respect to JB/T 8644-2007:
——the scope of this standard is modified (see Clause 1 hereof; Clause 1 of Edition 2007);
——the model and expression method are modified (see Sub-clause 3.1 hereof; Sub-clause 3.1 of Edition 2007);
——the relative sliding speed of the stator and rotor are changed to the sliding speed (see Sub-clause 3.4 hereof; Sub-clause 3.6 of Edition 2007);
——the volumetric efficiency and efficiency of large-sized and extra-large-sized pumps are modified (see Table 1 hereof; Table 1 of Edition 2007);
——the tolerance of flow rate is modified and the content “under the standard power and efficiency of shaft, the flow rate shall not be subjected to upper deviation control” is specified (see Sub-clause 4.2 hereof; Sub-clause 5.1 of Edition 2007);
——the requirements for the noise value of the pump are modified (see Sub-clause 4.6 hereof; Sub-clause 4.6 of Edition 2007);
——the recommended materials for stator and rotor are modified (see Table 3 hereof; Table 3 of Edition 2007);
——the temperature rise of the bearing is modified and the measuring point is specified (see Sub-clause 4.8.2 hereof; Sub-clause 4.14 of Edition 2007);
——the requirement that the pump body is not equipped with a safety valve is added (see Sub-clause 4.10 hereof);
——the load values of inlet and outlet flanges of pump in X, Y and Z directions are modified (see Table 4 hereof; Table 4 of Edition 2007);
——the requirements for pre-assembling and post-assembling of the pump are added (see Sub-clauses 4.12.2 and 4.12.5 hereof);
——the requirements for coupling installation and lifting components of equipment are added (see Sub-clauses 4.12.6 and 4.12.7 hereof);
——the painting requirements for pump are modified (see Sub-clause 4.13 hereof; Sub-clause 4.13 of Edition 2007);
——the requirements for prohibiting long-term operation of the pump in case of insufficient feed are added (see Sub-clause 4.14.2 hereof);
——the service life of the complete pump are changed from 1 year to 2 years, and the vulnerable parts are specified (see Sub-clause 4.14.4 hereof; Sub-clause 4.20 of Edition 2007);
——the requirements for the pump that is not subjected to NPSHR test are added (see Sub-clause 5.2 hereof);
——the requirements that when the pump test cannot be carried out by the manufacturer, the manufacturer can negotiate with the user to carry out the test on the user's site are added (see Sub-clause 5.6);
——the material inspection requirements are modified (see Sub-clause 6.1 hereof; Sub-clause 6.1 of Edition 2007);
——the end-of-factory test requirements and the storage period of test records are modified (see Sub-clause 6.3 hereof, Sub-clause 6.3 of Edition 2007);
——the supply scope of the complete pump is modified (see Sub-clause 7.1.1 hereof; Sub-clause 4.19 of Edition 2007);
——the storage conditions of the pump are added (see Sub-clause 7.4 hereof);
——the guarantee is added (see Clause 8).
This standard was proposed by China Machinery Industry Federation.
This standard is under the jurisdiction of the National Technical Committee on Pumps of Standardization Administration of China (SAC/TC 211).
The previous editions of this standard are as follows:
——JB/T 8644-1997 and JB/T 8644-2007.
Single screw pumps
1 Scope
This standard specifies the model and basic parameters, technical requirements, test methods, inspection rules, complete set, making, packaging, storage and guarantee of single screw pumps.
This standard is applicable to single screw pumps (hereinafter referred to as the pumps) that are used for transporting water-like and pasty even high-viscosity medium.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 9112 Types and parameters for steel pipe flanges
GB/T 9115 Steel pipe welding neck flanges
GB/T 9119 Slip-on-welding plate steel pipe flanges
GB/T 13306 Plates
GB/T 13384 General specifications for packing of mechanical and electrical product
GB/T 17241.6 Integral cast iron pipe flanges
GB/T 29529 Methods of measuring and evaluating noise of pumps
GB/T 29531 Methods of measuring and evaluating vibration of pumps
JB/T 4297 Painting specification for pumps
JB/T 6880.1 Grey iron castings for pumps
JB/T 6880.2 Steel castings for pumps
JB/T 8091 Testing methods for screw pumps
JB/T 8687 Sampling inspection for pump products
3 Model and basic parameters
3.1 Model and expression methods
Five groups of Chinese phonetic alphabet and numbers can be used to indicate the model of the pump, consisting of pump type, structure, installation type, purpose, flow rate and pressure parameters.
3.2 Examples of labeling
Example 1:
The horizontal single screw pump with the nominal diameter of the rotor of 15 mm and with a standard lead series for transporting food and medical media is labeled as follows:
GS15-1
Example 2:
The vertical single screw pump for marine use with nominal diameter of the rotor of 35 mm and with two standard lead series is labeled as follows:
GUC35-2.
Example 3:
At 200 r/min, the theoretical flow rate Q = 2 m3/h. The single screw pump, with the maximum pressure of P=0.6 MPa and with a long lead, for transporting corrosion resistant medium is labeled as follows:
GUF002-06.
3.3 Rotating direction
Seen from the driving end, the pump rotates in counterclockwise direction. In case of any special requirements from the user, the pump shall be manufactured according to the contract confirmed by both the supplier and the purchaser.
3.4 Basic parameters
Pumps are divided into five grades according to flow rate, as shown in Table 1.
Table 1 Classification of pumps
Grade Theoretical flow rate per 100 r Volumetric efficiency ηv Efficiency of pump η
L No load Rated pressure
Mini-sized ≤10 0.96 0.65 0.55
Small-sized >10~50 0.96 0.70 0.64
Middle-sized >50~200 0.96 0.75 0.68
Large-sized >200~800 0.97 0.81 0.73
Extra-large-sized >800 0.97 0.86 0.77
In the table, the test medium of efficiency index is clean water at 20℃, and the pump speed is the data under the relative sliding speed of stator and rotor at vgm=4 m/s. When the pump is integrated with the driving mechanism and cannot be disassembled, the efficiency of the driving mechanism shall be taken into account in measuring the total efficiency of the unit.
3.5 Design maximum speed
The design maximum speed of the pump is determined according to the relative sliding speed of the stator and rotor vgm=4 m/s: the design maximum speed of different types of pumps varies. The above speed is only used for assessing various indexes of the pump during type tests with clear water, and shall not be used as the actual speed. See Annex A for the speed range of the pump when transporting different medium.
4 Technical requirements
4.1 General requirements
The pump shall meet the requirements of this standard, and shall be manufactured according to the product drawings and technical documents approved through specified procedures. While considering the requirements of this standard, special requirements from the users (if any) shall be indicated in the order and the pump shall be manufactured according to the contract confirmed by both the supplier and the purchaser.
4.2 Efficiency of pump
The volumetric efficiency of the pump shall meet those specified in Table 1 of this standard. Under the condition that the power tolerance of pump meets the requirements of JB/T 8091, the efficiency of pump shall meet those specified in Table 1 of this standard, and the lower tolerance limit is 95 % of the specified value. Under the condition that both shaft power and efficiency reach the standard, the lower deviation of pump flow rate shall meet the requirements of JB/T 8091, and the upper deviation shall not be controlled.
4.3 Conditions for medium transported
The pump shall be capable of continuous normal operation under the following conditions for medium transported:
——the temperature is less than or equal to 80℃, and the special stator can reach -20℃~150℃ (otherwise agreed by both the supplier and the purchaser):
——the pump is allowed to transport medium containing solid particles and fibers. The maximum volume fraction of solid matters shall not exceed 40 %, the maximum particle diameter shall not exceed the eccentricity of the rotor, and the maximum fiber length shall not exceed 40 % of rotor pitch.
4.4 Marine conditions
The pump shall be capable of working reliably under the following marine conditions:
——periodic rolling of 22.5°;
——pitch of 7.5°;
——continuous heeling of 15°;
——continuous trimming of 15°.
4.5 Vibration level evaluation of pumps
The vibration value of the pump is determined by the following conditions:
——the pump are divided into four categories according to the theoretical flow rate of pump:
Category I: theoretical flow rate q ≤ 10 L at 100 r (mini-sized pump):
Category II: theoretical flow rate 10 L< q ≤ 50 L at 100 r (small-sized pump);
Category III: theoretical flow rate 50 L < q ≤ 200 L at 100 r (middle-sized pump);
Category IV: theoretical flow rate q > 200 L at 100 r (large-sized or extra-large-sized pump).
——the vibration level of the pump is divided into four levels: A, B, C and D. Among them, A, B and C indicate acceptance and D indicates rejection.
——the evaluation methods for vibration of pump shall meet those specified in Table 2.
Foreword i
1 Scope
2 Normative references
4 Technical requirements
5 Test methods
6 Inspection rules
7 Complete set, marking, packaging and storage
8 Guarantee
Annex A (Informative) Speed range of pumps transporting different medium
Annex B (Informative) Data sheet
