1. Scope The technical specifications of this project indicate the minimum requirements for metering pumps, their driving machines and auxiliary equipment for industrial installations. The engineering provisions of the metering pump performance, structural design, materials, drivers, tests, signs, packaging and procurement made provisions. 2. Standards, Codes and Regulations 2.1 In addition to the technical specifications of this project, the standards specified in the pump data sheet (the latest version) shall also be observed, for example: GB9236 metering pump technology; GB7783 metering pump test method; API Positive Displacement Pumps- ControlledVolume). 2.2 When the engineering specifications and specified standards conflict, the engineering provisions shall prevail. At the same time, the seller shall clarify the contradiction to the buyer in written form to remind the buyer to pay attention and solve it. 3. General 3.1 Unless otherwise specified, pumps, drives and their auxiliaries shall be suitable for outdoor start-up and continuous operation at the minimum and maximum ambient temperatures specified. Continuous operating cycle should not be less than 8000 hours. 3.2 The untested prototype can not be accepted, only the actual production of the pump can be accepted. The so-called production verification refers to the pump under similar operating conditions at least two years of safe operation experience. 3.3 Unless otherwise specified, the seller shall provide the entire pump set including pump, coupling, driver and all auxiliary equipment and ensure the quality of the entire pump set. 3.4 Unless otherwise specified, pumps, drives, couplings, shrouds and auxiliary equipment shall be mounted on the same base. 4. PERFORMANCE 4.1 The metering pump should be able to regulate the flow in both operating and non-operating conditions with an adjusted ratio of at least 10: 1 (ie 10% to 100% of the rated flow range) and 25% to 100% Pump stability should be within ± 1% accuracy, linearity and reproducibility accuracy should be within ± 3%. 4.2 Scale or adjust the hand wheel scale accuracy should be higher than ± 0.1% of the indicated accuracy. 4.3 The dosing pump should have a nominal flow rate at least equal to 110% of the maximum (operating) flow rate proposed by the user.