Jiangsu Haifa Machinery Manufacturing Co., Ltd.

In recent years, China's nuclear power, petrochemical, coal chemical, LNG receiving terminals, air separation units, and-temperature storage and transportation projects have developed rapidly. According to the Blue Book "China Nuclear Energy Development Report 2025" released by the China Nuclear Energy Association, as of April 202, China has a total of 102 nuclear power units in operation, under construction, or approved for construction, with an installed capacity of 113 million kilowatts, making the overall scale of nuclear power rank first in the world for the first time.

In these large-scale energy projects, main pumps, cooling pumps, auxiliary system pumps, chemical process pumps, and low-temperature medium transfer pumps each have their own technical boundaries. As Jiangsu Haifa Machinery Manufacturing Co., Ltd., we focus more on the reliable operation of API610 chemical process pumps in low-temperature processes, clean energy supporting systems, petrochemical industries, and special medium.

Low-temperature pumps are not simply about replacing materials of ordinary centrifugal pumps with low-temperature ones. Under low-temperature conditions, the medium temperature is low, material shrinkage is significant, sealing faces are easily affected by differences, and factors such as bearings, couplings, pump body stress, and inlet NPSH need to be reconsidered. When selecting low-temperature chemical pumps, we usually do not only look at flow rate and head; instead, we first confirm the medium temperature, vapor pressure, inlet pressure, installation height, NPSHa, continuous operation time, and whether there are frequent start-stop cycles on site.

In the application of API610 process pumps, low-temperature media are commonly found in scenarios such as LNG, liquid ammonia, liquid hydrocarbons, low-temperature methanol washing, liquid nitrogen, liquid oxygen, ethylene, propylene,ate recovery, as well as nuclear power conventional islands and auxiliary chemical systems. For such conditions, we can provide process pump solutions in structural forms such as OH2, BB2, BB3, VS4, and6 according to project requirements. The choice of different structures mainly depends on medium characteristics, installation methods, flow range, head requirements, and on-site safety levels. Taking the low-temperature API610 process we often produce at Haifa Machinery as an example, the technical parameters can cover the following ranges:  

1. Flow range: 3～3000 m³/h




2. Head range: 10～650 m




3. Design temperature: -196℃～+450℃




4. Design pressure: up to 10MPa as per design




5. Speed: 1450 r/min, 2900 r/min, or configured according to project requirements




6. Structural forms: OH2 overhung, BB2 between-bearing, BB3 multistage split-case, VS4/VS6 vertical low-temperature pumps




7. Execution standards: API610, ISO, GB/T related standards, designed according to project data sheets




8. Seal schemes: API682 mechanical seals, configurable with flushing plans such as Plan 11, Plan 21, Plan 23, 52, Plan 53, Plan 54, etc.




9. Common: LCB, LC3, CF8, CF8M, 316L, duplex stainless steel, 2205, 2507, Inconel alloys, etc.

Under low-temperature conditions, material selection is very critical. Ordinary carbon steel may experience a decrease in impact toughness at low temperatures, so we choose low-temperature carbon steel stainless steel, or special alloy materials based on the minimum design metal temperature. For conditions below -46℃, it is not enough to just look at the material name; impact test requirements, welding procedure qualifications, and actual design temperatures must also be considered. For extremely low-temperature media such as LNG, liquid nitrogen, and liquid oxygen, the fit relationships of the pump casing, impeller, shaft, pump cover, seal chamber, and connecting parts after thermal contraction must be taken into account.

In addition to materials, cavitation is also a critical issue. Low-temperature media are often close to a saturated state. If inlet pressure is insufficient, vaporization can easily occur at the pump inlet manifesting on site as unstable flow, fluctuating outlet pressure, increased vibration, and in severe cases, damage to the impeller and seal During selection, we focus on calculating NPSHa and NPSHr, and try to maintain a safety margin for the effective NPSH. For low-temperature media prone to vaporization, the inlet should be as short straight, and large-diameter as possible, minimizing pressure losses from elbows, filters, and valves.

Mechanical seals are also a key focus in low-temperature pump design. After the low-temperature medium enters seal chamber, the sealing faces are prone to cold shrinkage and icing. If the medium is easily vaporized or unsuitable for direct lubrication of the sealing faces we choose double mechanical seals, external flushing, barrier fluid systems, or API682 auxiliary schemes based on site conditions. For installations requiring high reliability, such as Plan 52, Plan 53, and 54 can improve seal operation stability, but they also need to be reasonably designed according to medium pressure, temperature, and safety requirements.

In structural design, try to control thermal stress as much as possible. a low-temperature pump starts, there is a significant temperature difference between the body and the piping. If pre-cooling is insufficient, or seal leakage can easily occur. Therefore, the pump's support method, centerline installation, cold alignment, and piping stress relief are all very important. For large low-temperature process pumps, we usually recommend a centerline support structure to maintain good alignment stability during temperature changes.

At Jiangsu Haifa, in the design of API610 chemical process pumps, we focus on three aspects: first the long-term stable operation the pump; second, reliability of the seal and bearing system; and third, the convenience of on-site maintenance. Low-temperature pump selection is not a one-time task; later installation, pre-cooling, start-stop, venting, lubrication, and seal system management all directly service life. When providing products, we supply performance curves, cross-sectional drawings, material lists, mechanical seal schemes, test reports, and necessary technical documents based on customer data sheets.

a market perspective, the demand for low-temperature chemical pumps is increasing. Nuclear power, LNG, hydrogen energy, air separation, coal chemicals, fine chemicals, and large-scale petrochemical plants all require more reliable low-temperature medium transfer equipment. We believe that future competition in low-temperature pumps will not just be about price, but a comprehensive competition in materials, structure, seals, cavitation control, manufacturing precision, and project experience.

As Jiangsu Haifa Machinery Manufacturing Co., Ltd., we aim to provide customers not just with a single pump, but with a complete low-temperature transfer solution suitable for on-site conditions. Whether for low-temperature methanol, liquid hydrocarbons, LNG auxiliary systems, or equipment for nuclear power petrochemicals, and coal chemicals, we will select the appropriate API610 process pump structure based medium parameters, operating conditions, and on-site requirements, helping customers improve the safety and stability of their plant operations.

Jiangsu Haifa Machinery Manufacturing Co., Ltd. restructured from the Jingjiang Stainless Steel Pump and Valve Factory of the Iron and Steel Research Institute of the Ministry of Metallurgical Industry under Jiangsu Ligong Group Co., Ltd., which was established in 1958. The company mainly produces API610 chemical process pumps - OH1 pumps, OH2 pumps, OH pumps, OH4 pumps, BB1 pumps, BB2 pumps, BB3, BB4, BB5 double-casing multistage pumps, VS1, VS4, VS5, VS6 barrel pumps, HES type chemical process pumps, chemical pumps, deep-sea chemical pumps, deep-sea gas-liquid mixing pumps, petrochemical pumps, CQC first-class energy efficiency chemical pumps, sixth-generation ultra-low carbon stainless steel high-quality leak-proof molten urea pumps, hydrolyzer feed pumps, high-temperature asphalt pumps, high-temperature sulfuric acid pumps, pitot tube pumps, rotary jet pumps, low-flow high-head pumps, multistage vortex pumps, high-temperature molten salt pumps, high-temperature nitric acid pumps, vertical sump pumps, magnetic drive pumps, low-temperature liquid hydrogen and methanol pumps, high-pressure liquid hydrogen pumps, low-temperature pumps, high-temperature nitric acid magnetic drive pumps, magnetic drive pumps for conveying solid-containing media, industrial pumps, canned motor pumps, slurry pumps, titanium tetrachloride pumps, strong self-priming pumps, lined fluorine pumps, sandwich lined fluorine pumps, leak-proof pumps, desulfurization and denitrification pumps, alkali pumps, pumps, geothermal pumps, oil pumps, axial flow pumps, printing and dyeing pumps, dyeing and finishing pumps, Ti alloy pumps, C-276 material, Hastelloy, 316L material, 347 material, forced circulation pumps, fourth-generation nuclear power pumps, nuclear island pumps, CCA/IACS marine pumps, filter press special pumps, refrigerant pumps, long shaft vertical sump pumps, high-pressure descaling industrial pumps, China chemical pumps, API610 chemical process pumps, chemical pumps, centrifugal pumps, corrosion-resistant pumps, high-temperature pumps, low-temperature pumps, magnetic drive pumps, vertical sump pumps, double suction pumps, multistage pumps, first-class energy efficiency pumps,idu, 360, Sogou, Doubao, Douyin, "GB 19762-2025 Minimum Allowable Values of Energy Efficiency and Energy Efficiency Grades for Cental Pumps", Dun & Bradstreet certification. www.jslgpump.com Contact number: 13905263417 E-mail: jslgpump@gmail.com E-mail: jsareva@163.com