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1 range
Provided that the engineering of industrial installations and its driving machine with a metering pump, auxiliary equipment, the minimum requirements.
The engineering requirements for the performance of metering pumps, structural design, materials, driving machine, testing, labeling, packaging and purchasing regulated.
2 standards, norms and regulations
2.1 In addition to the engineering requirements, comply with the pump data sheet should be indicated on the Standard (latest edition), such as:
GB9236 metering pump technical conditions;
GB7783 metering pump test methods;
API675 pumps (PositiveDisplacementPumps-ControlledVolume).
2.2 When the engineering requirements and specified standards conflict, subject to the provisions of the engineering.
At the same time the seller shall be in writing to clarify the discrepancies to the buyer, to remind the buyer s attention and resolve.
3 General
3.1 Unless otherwise specified, pump, drive machine and its auxiliary equipment shall specify the minimum and maximum outdoor ambient temperature for start-up and continuous operation. Continuous operation cycle should not be less than 8000 hours.
3.2 untested prototype can not be accepted, and only production-proven pumps can accept. The so-called production-proven pump is operating in similar conditions at least two years experience of safe operation.
3.3 Unless otherwise specified, Seller shall provide, including pump, coupling, driver and all auxiliary equipment including the pump unit, and to ensure the quality of the pump unit.
3.4 Unless otherwise specified, pump, drive unit, coupling and guard, auxiliary equipment should be installed on the same base.
4 Performance
4.1 metering pump should be able to operate in the operating or non-state flow can be adjusted, the adjustment ratio of at least 10:1 (10% to 100% of rated flow range), and 25% to 100% range of the stability of metering pump of accuracy should be within ± 1%, linearity and reproducibility accuracy should be within ± 3%.
4.2 scale or adjust the hand wheel adjustment scale accuracy of ± 0.1% should be higher than the accuracy of the instructions.
4.3 The rated flow metering pump should be at least equal to the user s maximum (operating) flow of 110%.
4.4 Motor power rating should be at least equal to the maximum shaft power metering pumps (including gear box, coupling power loss) K times. K value given in the table to take.
Maximum shaft power Pa (kW)
Maximum shaft power Pa (kW) K
Pa ≤ 3150%
Pa ≤ 19125%
19Pa> 55110%
4.5 effective NPSH NPSHa and NPSH NPSHr should use the same datum. NPSHa and NPSHr difference is less than equal to 0.6m should be NPSH test.
5 design
5.1 Pressure parts
5.1.1 The maximum outlet pressure of the pump allows the pump should be at least equal to 110% of rated outlet pressure.
5.1.2 All pressure parts (including the impact of inlet pressure area) should be allowed maximum pumping temperature, outlet pressure design, by taking the material allowable stress values:
Of domestic pumps, should not be greater than HG20531-93 (cast iron, cast steel containers) the maximum allowable stress values;
On imported pumps, should not exceed ASMESectionVIII the maximum allowable stress values.
5.2 Interface
5.2.1 Unless otherwise provided in the data table, all interfaces are the flanges.
5.2.2 Unless otherwise specified, the import and export of domestic pump connection flanges shall comply with the provisions of GB9112, import export pump connection flanges shall comply with the provisions of ANSIB16.1 and 16.5. Diameter or thickness greater than the above standard flange is allowed.
5.2.3 Import and Export flange should take the same level of pressure flange.
5.3 Pump
5.3.1 Stuffing box packing rings should be provided in order to fill the wash or lubrication.
5.3.2 shall ensure that the leakage of hydraulic fluid side packing do not enter the power end.
5.4 Diaphragm
5.4.1 Single or double diaphragm pumps diaphragm pumps diaphragm diaphragm should limit the first institution.
5.4.2 Dual-diaphragm between the two diaphragms should be filled with inert liquid (and divide both sides of the process fluid, hydraulic oil mixture should not harm), and should have a probe, when the alarm time when the diaphragm rupture.
5.5 Bearings
Bearings should be a standard form, shall not be used to develop their own manufacturing non-standard bearings.
5.6 buffer
If the data specified on the table, the import and export buffer provided by the seller, buyer and seller of its type by mutual agreement.
5.7 safety valve
5.7.1 Oil chamber diaphragm valve should be able to automatically reset and the adjustment, maintenance, replacement easy, and its set pressure metering pump should be at least 110% of rated pressure.
5.7.2 If the data specified on the table, the external piston pump with safety valve provided by the seller.
5.8 auxiliary piping
5.8.1 If you need lubrication, cooling and seal flushing pipe system, the seller shall provide and install the pump and (or) base.
5.8.2 All piping system, pipe, fittings, etc. should not be less than 1 / 2 inch (13mm), the wall thickness of not less than 1.6mm (1 / 16 inch).
5.8.3 Unless otherwise specified ,1-1 / 4 (32mm) ,3-1 / 2 (90mm), 7 (175mm), 9 (225mm) inches of the tube can not be used.
6 Material
6.1 Materials determined by the buyer to fill in the pump data sheet. If the seller is more appropriate that the other materials, may make a written report, but whether to adopt the required confirmation of the buyer.
6.2 Unless otherwise specified, carbon steel, low alloy steel corrosion allowance to take 3mm, high alloy steel to take 0mm.
6.3 Do not use materials containing asbestos fibers.
6.4 transport of organic solvents, the rubber material is strictly prohibited.
6.5 transport flammable or toxic media pressure can not use cast iron parts.
6.6 In addition to austenitic stainless steel, when the medium or ambient temperature ≤ -20 ℃, the Seller shall base metal and welded joints for V-impact test.
7 workshop test
7.1 Workshop pilot project see pump data sheet.
Hydrostatic test pressure shall be 7.2 maximum allowable working pressure of 1.5 times, but not less than 0.14MPaG.
Stability of the accuracy test is mandatory, its accuracy should be within ± 1%, reproducibility and linearity test accuracy test is optional, its accuracy should be within ± 3%.
7.3 pairs specified by the purchaser to be the scene witnessed inspection or test items, the seller to determine the test should be at least twenty days after the date of notification the buyer to the buyer in time to participate.
7.4 Non-witnessed test results should be recorded and sent to the buyer s approval.
8 painting, marking, packaging
8.1 Painting
8.1.1 should be removed before painting all the dust, rust, oil and other attachments.
8.1.2 Equipment shall be the buyer finish requirements.
8.2 mark
8.2.1 Application of 18-8 pump made of stainless steel plate, and secured a prominent place in the pump.
8.2.2 The plate should include:
a. bit number;
b. the device name / device name;
c. the seller (manufacturer) name and trademarks;
d. pump type and name;
e. The main parameters of the pump, including the rated flow rate (l / h), allowing the maximum outlet pressure (MPaG), safety valve set pressure MPaG, shaft power (kW), and pump weight (kg), etc.;
f. pump serial number and date.
8.3 import and export of pumps should be set metal sealing plate, and with rubber pads and at least four bolts.
8.4 pump and auxiliary piping (including the driver and auxiliary equipment) should be able to ensure that the packaging of the product is not damaged during transport, loss, and should be suitable for outdoor placement and storage time should be able to guarantee open at least six months.
9 files, drawings
9.1 Vendor Quote
Seller s offer should include the following information:
a. buyer data sheet, completed by the seller which the seller of data;
b. Initial dimensional drawing, piping layout;
c. of water, electricity, steam and other utility requirements;
d. The typical profile of the pump;
e. Recommended spare parts list;
f. whether the strict implementation of the pump unit the specific instructions. If the pump unit is not in strict compliance with the instructions, the seller shall submit a detailed explanation of each of the specific list of discrepancies.
9.2 Contract Data
9.2.1 The seller must be identified on the purchase order to provide time for the file, type, number of copies sent to the address indicated on the order.
9.2.2 The following shall be marked on each page of the document:
a. the buyer (user) Company name;
b. project number;
c. Purchase order number or file number;
d. pump-bit number;
e. Purchase Order to comply with any other representation.
9.2.3 The seller shall provide at least the following documents:
a. file directory list;
b. Pump Data Sheet (for manufacturing);
c. stability of the accuracy test report;
d. dimensions and layout (including basic data, the main import and export over the location, size and pressure rating, the motor terminal box position, import and export pipeline allowable external forces and moments, etc.);
e. Auxiliary piping layout and take over the table (which can also be in the dimensional drawings on that);
f. pump profile and materials containing the name of the component parts table column;
g. seal profile and related parts and materials containing a list of names of parts;
h. spare parts inventory;
i. lubricating oil, hydraulic oil inventory;
j. auxiliary device data sheet (if required);
k. installation, maintenance, operating instructions.
9.2.4 If the buyer requires the seller to the buyer shall provide the following reports and records:
a. material test reports;
b. reproducibility, precision, linearity test report;
c. plant test data records;
e. Other requirements of the test report.