May 11,2015

Our company convened a special symposium to analyze the impact of “Made in China 2025” on the slurry pump industry.

May 11,2015

The slurry pump industry enjoys strong market demand and robust growth momentum.

Slurry pumps are versatile fluid-handling machines widely used in the chemical industry. They offer numerous advantages, including a broad range of operational capabilities—covering flow rate, head, and compatibility with various process fluids—along with compact dimensions, simple construction, ease of operation, and low operating costs. In recent years, China’s pump and slurry-pump industries have experienced rapid growth, driven by continuous improvements in slurry-pump manufacturing technologies and the expanding downstream demand market, resulting in very promising prospects for the slurry-pump sector both domestically and internationally. Currently, most slurry-pump designs are standardized, with a single model often employed across many applications, leading to poor overall adaptability and suboptimal efficiency. Recent design trends, however, emphasize tailoring pumps to specific operating conditions, thereby enhancing their performance and reducing life-cycle costs. Looking ahead, the petroleum industry is expected to see substantial increases in demand for high-efficiency injection pumps, heavy-oil pumps, pipeline pumps, and screw pumps for oil production, transportation, and refining, with total demand for various industrial pumps projected at approximately 140,000–150,000 units. Meanwhile, in the three major categories of chemical-process pumps, markets for large-scale methylamine pumps for fertilizer production, medium- and large-sized high-temperature, high-pressure magnetic-drive pumps, and non-metallic chemical pumps made from special materials are also anticipated to expand, with total demand for these types of pumps estimated at 100,000–120,000 units. Experts forecast that by 2020, China’s slurry-pump import value will reach an astonishing US$5 billion, surpassing the United States’ US$4.9 billion and making China the world’s largest importer of slurry pumps.

Nov 22,2015

“Because of dedication, we are professional.” – DAER Pump Industry Co., Ltd.

DAER Pump Co., Ltd.’s 2016 slogan is: “Because of our dedication, we are professional.” DAER Pump Co., Ltd. is committed to providing market-leading slurry pump products and services. Our comprehensive projects and all-inclusive slurry pump handling solutions are designed to meet the technical and commercial needs of customers in the global mining, power generation, dredging, metallurgy, chemical, building materials, and petroleum industries. We specialize in delivering and supporting solutions for a wide range of slurry pump equipment, including slurry pumps, desulfurization pumps, sewage pumps, and mud pumps. DAER Pump Co., Ltd. offers end-to-end solutions for all customers, covering slurry pump design, selection, commissioning, and more.

Dec 04,2015

What are the advantages and disadvantages of the common sealing types used in slurry pumps?

With the development of society, slurry pumps are now used in an increasingly wide range of applications, and the media they convey are becoming ever more complex. While we strive to reduce wear on slurry pumps, we are also placing higher demands on their sealing performance. Poor sealing can lead to significant media leakage, resulting in substantial economic losses; moreover, the release of toxic substances may pose a threat to human life and safety. Consequently, sealing technology has become a critical issue. There are three main types of sealing for slurry pumps: packing seals, mechanical seals, and auxiliary impeller seals. Each of these sealing methods has its own characteristics, as well as distinct advantages and disadvantages. 1. Packing Seals Packing seals are the most common type of seal. They operate by injecting pressurized water into the packing gland, continuously supplying water under pressure to prevent slurry from leaking out of the pump casing. For multistage series-connected pumps that are not suitable for auxiliary impeller seals, packing gland seals are typically employed. a) Advantages of packing seals: ① Simple structure, easy maintenance, and low cost; ② Sufficient elasticity, flexibility, self-lubricity, and impermeability. b) Disadvantages of packing seals: ① Large leakage rates and significant power loss; ② Inability to handle toxic or corrosive liquids. 2. Mechanical Seals Mechanical seals are generally used in applications with stringent sealing requirements, particularly in the chemical industry, where not only tight sealing is required but, more importantly, no extraneous substances are allowed to enter the pump. They are well suited for harsh operating conditions involving high solid particle content and are commonly employed in alumina plants, flue-gas desulfurization systems, ash removal systems in power plants, and the paper-pulp industry—sectors where direct economic losses can occur. When the medium temperature is below 70°C, the seal chamber may be filled with No. 30 machine oil (remove

Dec 08,2015

How to Maintain and Disassemble a Slurry Pump That Uses an Impeller Removal Ring

Slurry pumps are suitable for conveying fluids under harsh conditions, such as those containing large particles and exhibiting strong adhesion. There are many types of slurry pumps, each with different functions; some require the installation and removal of a dismantling ring. While this design can enhance the pump’s performance and safety, when using slurry pumps equipped with a dismantling ring, the following points must be observed: 1. Maintenance and rust prevention: For such slurry pumps, the hex bolts on the dismantling ring must be sealed with grease to prevent rust. Rust on the bolts not only makes it more difficult for users to disassemble the pump but also adversely affects its normal operation; therefore, rust prevention is crucial for pumps with a dismantling ring. 2. Disassembly procedure: When removing the dismantling ring from the pump casing, proper technique is essential. First, all the internal hex bolts should be removed; only after they are completely detached should the three bolts on the dismantling ring itself be loosened. Next, the retaining block above the dismantling ring should be removed, followed by gradually loosening the impeller. This disassembly method helps minimize damage to the pump casing during the process.

Dec 12,2015

How are the head and flow rate of a slurry pump calculated?

I. Head of Slurry Pumps The head of a slurry pump is the energy imparted to a unit weight of liquid by the pump. The calculation of slurry pump head can be broadly divided into three cases (as shown in the figure): Case 1: h = D + S + hf1 + hf2 + h3 + Pd − Ps Case 2: h = D − S + hf1 + hf2 + hf3 + Pd − Ps Case 3: h = D + S + hf1 + hf2 + hf3 + Pd − Ps Where: D —— Discharge geometric head, in meters; value: positive if above the pump inlet centerline, negative if below; S —— Suction geometric head, in meters; value: negative if above the pump inlet centerline, positive if below; Pd and Ps —— Operating pressure inside the vessel, in meters of liquid column (gauge pressure); value determined by whether the gauge pressure is positive or negative; Hf1 —— Head loss due to straight-pipe friction, in meters of liquid column; Hf2 —— Head loss due to pipe fittings, in meters of liquid column; Hf3 —— Local head loss at the inlet and outlet, in meters of liquid column; h —— Pump head, in meters of liquid column. II. Flow Rate of Slurry Pumps The determination of slurry pump flow rate mainly involves the following three points: 1. If the slurry pump process specifies minimum, normal, and maximum flow rates, the maximum flow rate should be used as the basis for design. 2. If only the normal flow rate is specified in the process, a certain margin should be provided. For large-flow, low-head slurry pumps with NS > 100, the flow margin should be 5%; for small…