In industries such as oil and gas, and chemical processing, high pressure reciprocating plunger pumps are critical core equipment. To ensure the safety and high operational performance of equipment, the American Petroleum Institute (API) has established the API 674 standard.   1. API 674 Standard and Scope of ApplicationThe API 674 standard applies to heavy-duty reciprocating plunger pumps driven by electric motors or engines, used for handling clean liquids or those containing small amounts of solid particles. It specifies basic requirements for pump structural design, material selection, and other aspects, ensuring stable operation of equipment under harsh conditions. The scope of application covers upstream oil and gas extraction, midstream gathering and processing, and downstream refining and petrochemicals. It is not applicable to special types such as high-precision metering pumps or diaphragm pumps.   2. API 674 Technical Specifications This standard sets forth systematic technical requirements for the hydraulic performance, mechanical structure, and operational reliability of pumps: In terms of hydraulic design, it specifies minimum requirements for flow rate, pressure pulsation control, and volumetric efficiency; regarding mechanical structure, it stipulates the strength, wear resistance, and fatigue life of key components in both the hydraulic and power ends, and requires the use of validated material grades to withstand corrosive or high-temperature operating conditions. In addition, the standard covers vibration and noise limits, lubrication system configurations, seal arrangements, and requirements for safety relief devices, ensuring the safety and maintainability of the equipment during continuous, high-load operation. All pump models must pass the specified tests to verify compliance with API 674 technical requirements.   3. Differences Between API 674 Pumps and Standard Pumps   Standard Pumps API 674 Pumps Standard General Machinery Standard API 674 Standard Design Basic functionality Specifically designed for oil and gas applications Testing No mandatory complete testing required Full performance testing and mechanical running tests are mandatory Application Simple hydrostatic testing, etc. Oil and gas, water injection, high pressure applications, etc.   Choosing a professional reciprocating pump supplier with API 674 manufacturing capability is key to ensuring production continuity. Elephant Machinery specializes in the production of reciprocating triplex and quintuplex piston pumps and plunger pumps.