In the oil and gas and petrochemical industries, reciprocating pumps are critical equipment, and their reliable operation is of the utmost importance. To this end, the American Petroleum Institute (API) has established the API 674 standard to ensure the safe, stable, and efficient operation of reciprocating injection pumps in these industrial sectors.   1. What is the API 674 Standard? The full title of the API 674 standard is “Positive Displacement Pumps - Reciprocating” It is a comprehensive industry standard covering the design and manufacture of reciprocating injection pumps.   2. API 674 Technical Requirements Specify rated values and tolerance ranges for flow rate, pressure, power, and other parameters to ensure the pump delivers a stable flow rate and pressure of the medium; establish requirements for the structural design, dimensional calculations, and strength verification of core components such as the crankcase and crankshaft; Based on the characteristics of the pumped medium, the standard specifies materials for flow-passing, sealing, and pressure-bearing components, requiring them to possess good workability and durability; it strictly defines the structural design, sealing material, installation requirements, and leakage limits for dynamic and static seals in the sealing system to prevent medium leakage.   3. Why Choose Reciprocating Pumps? Reciprocating pumps offer exceptional pressure characteristics, delivering high pressure with stable output. Their flow rate is adjustable with high precision, meeting the lubrication requirements of various operating conditions. They are highly adaptable to different media, capable of reliably delivering high-viscosity fluids or those containing small amounts of impurities, and are minimally affected by changes in fluid viscosity. With a simple design and highly interchangeable components, reciprocating pumps are easy to maintain, robust, and durable, ensuring reliable operation while reducing failure rates and maintenance costs.   As a professional developer and manufacturer of reciprocating pumps, Elephant Machinery not only offers products that comply with the API 674 standard but also provides customized solutions. From triplex, quintuplex, to septuplex pumps, we meet the requirements of various operating conditions, and can also equip them with an intelligent pump station system.

In high pressure oilfield applications, the selection of injection pump directly impacts water injection efficiency and oil recovery rates. Given complex geological conditions and extreme operating environments, the pump selection process requires multi-dimensional evaluation—whether for water injection, polymer injection, chemical injection, or CO₂ injection.   1. Technical Parameters Flow rate and pressure are the primary technical indicators for selecting injection pumps, determining whether the pump can meet oilfield development process requirements. Flow rate must be determined based on the oilfield water injection plan, considering either the daily injection volume or instantaneous injection rate. In high pressure oilfields, daily injection volumes per well vary significantly. Pressure parameters are even more critical, as injection pressure must overcome multiple resistances. Pressure stability affects the water injection spread coefficient, and plunger pump demonstrate distinct advantages under high pressure operating conditions.   2. Medium Characteristics Common injection fluids in high pressure oilfields include fresh water, produced water, polymer solutions, and chemical displacement agents. Different media impose varying demands on pump corrosion resistance and wear resistance. Medium viscosity and sand content also influence pump selection.   3. Pump Type Selection Reciprocating pump (especially triplex or quintuplex models) utilize the reciprocating motion of plunger to draw in and discharge fluids, capable of generating extremely high effective head. While these pumps have relatively low displacement, they offer a wide adjustment range and high overall efficiency, making them particularly suitable for conveying low-flow, high-pressure, or even highly viscous liquids. Diaphragm pump convey fluids through the reciprocating deformation of a diaphragm, making them suitable for transporting liquids containing solid particles, highly corrosive substances, or toxic/hazardous chemical displacement agents. In high pressure oilfield polymer injection and chemical displacement applications, they protect the molecular chain structure of polymer solutions, ensuring efficient oil displacement.   For high pressure, low-flow, high-viscosity, or complex media applications, reciprocating plunger pumps are the preferred choice. Elephant Machinery specializes in manufacturing reciprocating plunger pumps, piston pumps, diaphragm pumps, and complete turnkey solutions.