On offshore drilling platforms and in chemical plants, chemical injection pumps are core equipment ensuring stable production and preventing process abnormalities. They are required to continuously convey corrosive, high pressure hazardous chemicals over long periods. The API 675 standard is specifically designed for positive displacement metering pumps, regulating multiple critical aspects of the design and manufacture of chemical injection pumps, thereby ensuring the overall reliability of chemical injection systems.   1. What is API 675? API 675, formally titled *Positive Displacement Pumps—Controlled Volume for Petroleum, Chemical, and Gas Industry Services*, is an industry standard published by the American Petroleum Institute (API) that establishes uniform technical requirements for positive displacement metering pumps used in the oil and gas and petrochemical sectors. Compared to general industrial metering pump standards, it imposes stricter requirements across multiple dimensions for chemical injection applications under severe operating conditions. It is widely used in high-risk chemical production scenarios such as offshore oil and gas extraction and onshore refining and petrochemical processing.   2. Reliability API 675 establishes a comprehensive regulatory framework centered on reliability standards, covering everything from design and manufacturing to material selection and testing controls. Addressing the high pressure, corrosive, and continuous operating conditions typical of the petrochemical industry, it clearly defines technical specifications for positive displacement metering pumps at every stage from production to shipment, providing standardized assurance for the stable operation of chemical injection systems in high-risk chemical environments.   3. Standardization API 675 requires that every aspect of metering pumps meet design requirements for high pressure and continuous operation. It specifies performance requirements for materials used in pressure-bearing and flow-through components based on the corrosion characteristics of different chemical agents and the pressure ratings of specific operating environments, mandating that materials meet minimum standards for chemical resistance and pressure strength. Products must undergo standardized performance testing prior to shipment, and a comprehensive quality control system must be established.     API 675 is not just a standard; it is a safeguard for industrial production. Elephant Machinery’s chemical injection pumps are manufactured in strict accordance with the API 675 standard and are backed by a comprehensive quality management system.

A diaphragm pump is a positive displacement pump that uses the reciprocating motion of a flexible diaphragm to transport fluids. Its most notable structural feature is the complete isolation of the conveyed medium from the power transmission mechanism.   1. Working Principle The diaphragm undergoes periodic deformation under the action of a driving mechanism (usually electric, hydraulic, or diesel engine), creating volumetric changes inside the pump chamber. When the diaphragm retracts, the pump chamber volume increases and pressure decreases, causing fluid to be drawn in through the inlet check valve. When the diaphragm moves forward, the pump chamber volume decreases and pressure rises, forcing fluid out through the outlet check valve. This reciprocating cycle enables continuous fluid delivery.   2. Advantages Achieves absolutely leak-free operation, making it especially suitable for conveying toxic, hazardous, flammable/explosive, or high-purity media; The pump body does not contaminate the fluid, meeting hygienic requirements for industries such as food, pharmaceuticals, and electronics; Capable of handling fluids containing solid particles, high‑viscosity materials, or shear‑sensitive substances, with a scope of application far exceeding that of traditional centrifugal pumps.     3. Drive Modes Electric diaphragm pump: Provides stable and controllable flow, suitable for continuous operation. Hydraulic diaphragm pump: Delivers high output pressure and is often used in metering applications. Diesel engine diaphragm pump: Ideal for field environments without electrical power supply or where mobile operation is required.   4. Applications Suitable for industries such as oil extraction, petrochemicals, electric power, and chemical engineering; Capable of conveying sewage as well as various corrosive and non-corrosive media; Can be manufactured into specialized pumps such as water injection pumps, pressure testing pumps, and acid/alkali/salt pumps; Can be produced as special pumps such as liquid ammonia pumps, methyl carbamate pumps, polymer injection pumps, and alcohol injection pumps; Covers industrial and agricultural pumps, adaptable to high-temperature and low-temperature operating conditions.     Elephant Machinery has recently launched new products: mechanical diaphragm metering pumps and high pressure process diaphragm pumps. If you have any requirements for reciprocating pumps, please feel free to contact us!