The Monument of Longgang: Recognition as the Sixth Batch of National “Little Giant” Enterprises
Recently, the Shandong Provincial Department of Industry and Information Technology announced on the official website the sixth batch of “little giant”enterprise —entitled as newly emerged, specialized and innovative. With the completion of the publicity period, Yantai Longgang Pump Industry Co., Ltd. was identified as the sixth batch of national “little giant” enterprises. Longgang Pump industry is the leader in domestic […]
The Showcase of Technical Strength and Innovation: Our Honor in TatOilExpo-2024
In late August, the refreshing breeze of golden autumn heralds TatOilExpo-2024 taking place from August 26-28, 2024. The chairman leads the Longgang delegation, showcasing our latest technological achievements and innovative solutions at the Expo. He engaged in meaningful discussions with industry leaders, partners, and potential clients worldwide. Mr. Oleg, Minister of Industry and Trade of the Republic of Tatarstan, visited the booth […]
How to Specify a Centrifugal Pump for Corrosive Chemical Service
A centrifugal pump for corrosive chemical service must be specified based on the fluid, temperature, pressure, flow, materials, sealing arrangement, and operating environment. Selecting by flow and head alone can create problems with corrosion, cavitation, mechanical seal life, or maintenance access. Longgang Pump produces BB, OH, and VS chemical centrifugal pumps for petrochemical, coal chemical, environmental-protection, and water-treatment […]
High Pressure Multistage Pump Selection for Demanding Service
A high pressure multistage pump should be selected from the required head, flow range, fluid condition, temperature, pressure class, and maintenance strategy. The main structural decision is often whether a segmented BB4 arrangement or a double-shell BB5 arrangement better suits the duty. Material compatibility, axial-force balance, bearing protection, and seal support then determine whether the […]
Centrifugal Pump Cavitation Prevention with NPSH and Impeller Design for Harsh Industrial Service
Centrifugal pump cavitation prevention starts before commissioning. The reliable approach is to assess the actual NPSH margin, liquid vapor pressure, inlet geometry, rotor support, mechanical seal arrangement, and wetted materials as one selection problem. That matters in petrochemical, coal chemical, and low-temperature services because a pump can meet its flow and head duty while still […]
API 610 Centrifugal Pump Selection for Petrochemical Coal, Chemical and Water Treatment Systems
API 610 centrifugal pump selection should begin with the project duty, not a preferred model. The appropriate structure, mechanical seal system, and wetted materials change with the liquid, temperature, pressure, vapor pressure, solids content, layout, and maintenance requirements. Longgang Pump‘s BB, OH, and VS families provide different engineering answers for refinery, coal-chemical, water-treatment, utility, and […]
Centrifugal Pump Priming System Choices for Negative Suction and Low-NPSH Applications
A centrifugal pump priming system is needed when the pump cannot remain fully flooded before start-up. Negative suction, long suction piping, high points in the line, volatile media, and low-NPSH conditions can all leave air or vapor in the casing. The right arrangement keeps liquid at the impeller eye, helps the pump establish flow quickly, […]
Centrifugal Pump Priming Checks for High-Temperature Chemical Service
Centrifugal pump priming removes air and vapor from the casing and suction line so the impeller starts with a continuous liquid column. In high-temperature chemical service, that simple step protects flow stability, mechanical seals, bearings, and the hydraulic surfaces that keep a process pump predictable. When priming is weak, the pump may spin without moving […]
How to Prime a Centrifugal Pump for Reliable Industrial Startup
How to prime a centrifugal pump begins with one practical goal: remove air from the casing and suction line so the impeller starts in liquid, not gas. A centrifugal pump cannot create stable discharge pressure when air occupies the passage where liquid should be. Correct pump priming protects the impeller, mechanical seal, bearings, and suction […]
Centrifugal Pump Priming System Selection for Negative Suction and Vapor-Prone Fluids
A centrifugal pump priming system is needed when the pump cannot reliably stay filled with liquid before startup, especially under negative suction, long suction piping, or vapor-prone service. The system removes air or vapor so the pump casing, suction line, and first-stage impeller receive liquid immediately. In industrial plants, priming also prevents dry running, cavitation, […]
BB4 vs BB5 Pump: How to Choose a Multistage Centrifugal Pump for High-Pressure Service
The main BB4 vs BB5 pump difference is pressure containment: a BB4 is a radially split, segmented multistage pump with one casing, while a BB5 places a multistage inner assembly inside a second barrel-style pressure casing. Neither design is automatically superior. The correct multistage centrifugal pump depends on liquid properties, temperature, pressure, duty profile, containment […]
API 610 BB2 Pump Selection for High-Temperature Petrochemical Service
An API 610 BB2 pump is a strong choice for high-temperature petrochemical service when the duty requires a radially split, between-bearings machine with stable shaft support, controlled thermal growth, and configurable sealing. Selection must still be based on the actual duty point, fluid, suction conditions, materials, and seal arrangement rather than the series limits alone. […]