Magnetic pump is a centrifugal pump that uses the principle of magnetic coupling (magnetic transmission) to transmit torque and achieve complete static sealing.

Product attributes :  Maximum head :>150m Maximum fiow:>400L/min Driving type:Motor Working impeller number:Single-Stage Pump Working impeller inlet way:Single Suction Pump Pump shaft positon:Vertical Pump Transportation package:Wooden Case Specification:API 685 standard  Trademark:Dalian TIANHEPump Co.,Ltd Origin:Dalian,Liaoning,China

The technical parameter system of magnetic pumps is closely related to the design standards followed. According to your application scenario, it can be mainly divided into two categories: international overload standards (API 685) and national/industry standards (JB/T 7742, etc.). The former is used for harsh working conditions such as petrochemicals, while the latter is used for general industries.

1、 API 685 Heavy duty Magnetic Pump (Petrochemical/Oil and Gas Industry)
This is the leak free version of API 610 pump that you previously focused on, suitable for high-risk and volatile media. Both international first-line brands (such as Flowserve) and domestic backbone enterprises (such as Wanfulong) have mature series. The following are typical parameter ranges designed based on the API 685 standard:

Supplementary Explanation of Typical Scope/Design Capability of Parameter Projects
Typical application of flow rate 1.5-1400 m ³/h covering API 685 standard
Lift capacity of 10~125 m (up to higher), single-stage lift capability, multi-stage series connection can reach higher
The maximum working pressure is 10.0 MPa (approximately 100 bar), and the pressure levels are usually 2.5 MPa, 4.0 MPa, and 10.0 MPa
Suitable for temperatures ranging from -80 ° C to+450 ° C, with a wide coverage range for both low-temperature and high-temperature models
Typical 4-pole and 2-pole motor speeds at 1450/2900 r/min
The motor power range is wide from 1.1 to 250 kW, meeting different working conditions
Applicable media: alcohols, benzene, phenols, acids, bases, liquid chlorine, hydrocarbons, etc. Suitable for flammable, explosive, highly toxic, corrosive liquids
The core design standard API 685 (equivalent to API 685-2000) specifies the minimum requirements for unsealed pumps, including mandatory clauses such as secondary containment and internal circulation
Material grades 304, 316, 316L, HC276 and other optional corrosion-resistant alloys meet the material requirements of API 685
Key technical features
Leak free design: Using alloy isolation sleeves (such as Hastelloy C4) as static sealing boundaries to eliminate leaks structurally.

Secondary containment: API 685 mandates the design of a secondary safety system (outer shell+backup sealing ring) to provide additional protection in the event of failure of the primary isolation sleeve.

Internal flushing and cooling: Utilizing process fluids to circulate internally, lubricate bearings, and cool magnetic couplings without the need for an external flushing system.

2、 National/Industry Standard Magnetic Pump (General Industrial)
This type of pump follows domestic standards such as JB/T 7742 and JB/TQ 786, and is widely used in industries such as chemical, pharmaceutical, electroplating, and environmental protection. According to different series and materials, their parameters have their own emphasis.

1. CQB series/IMC series (standard type, temperature resistance ≤ 100 ° C)
This is the most common stainless steel magnetic pump series, with strong parameter universality.

Supplementary Explanation of Typical Scope/Design Capability of Parameter Projects
The flow rate can reach around 50 m ³/h depending on the specific model, and some series can reach higher speeds
The lift can reach about 50 meters
Maximum working pressure ≤ 1.6 MPa standard design pressure
Suitable for temperatures ranging from -20 ° C to+100 ° C, the fluoroplastic lining can achieve higher temperature resistance
Medium density ≤ 1600 kg/m ³. If the density is too high, a higher power motor should be selected
Medium viscosity ≤ 30 × 10 ⁻⁶ m ²/s is approximately equivalent to 30 cSt
The core standard JB/T 7742 (Small Magnetic Driven Centrifugal Pump) specifies the basic parameters and technical requirements
2. CQG series/IMC-G series (high temperature type, temperature resistance ≤ 280-350 ° C)
Specially designed for high-temperature media such as thermal oil and heat medium.

Supplementary Explanation of Typical Scope/Design Capability of Parameter Projects
Suitable for temperatures ≤ 280 ° C~350 ° C, using special heat-resistant materials and cooling structures
Working pressure ≤ 1.6 MPa
Flow rate of about 1-100 m ³/h to cover common high-temperature medium transportation needs
Lift approximately 10-50m
The core design includes a bearing frame with a cooling chamber that isolates high temperatures through circulating water or a fan to protect the bearings and magnets
3、 Key limitations and taboos in selection
Regardless of the type of magnetic pump, the following common restrictions must be followed during use, otherwise it is highly susceptible to damage:

Absolute prohibition of idling: The bearings and cooling lubrication of the magnetic pump rely entirely on the conveying medium, and idling for a few seconds can lead to burning.

Media cleanliness: It is strictly prohibited to contain ferromagnetic particles (magnetic filters need to be added). If it contains hard particles, a filter screen must be added to the inlet.

Easy to crystallize/polymerize media: When transporting media that are prone to precipitation or crystallization (such as certain chemicals), it is necessary to clean them promptly after stopping the pump to prevent the media from solidifying and locking the rotor.

summary
Application Level Core Standard Temperature Range Pressure Upper Limit Main Application Fields
Heavy duty API 685-80 ° C~450 ° C 10.0 MPa (100 bar) for refining, petrochemical LNG、 High risk chemicals
General grade JB/T 7742-20 ° C~100 ° C 1.6 MPa Fine chemical, pharmaceutical, electroplating, environmental protection
High temperature enterprise standard refers to API ≤ 280-350 ° C 1.6 MPa thermal oil furnace, heat medium transmission
What type of application scenario are you currently focusing on? If you need further confirmation of the selection recommendations for specific working conditions, please let me know the requirements for medium, temperature, flow rate, and head, and I will help you make a more accurate judgment.

Revolutionary feature: It uses the magnetic force of a set of permanent magnets (or electromagnets) to penetrate the isolation sleeve in a non-contact manner, transmitting the torque of the motor to the impeller on the pump shaft. It completely eliminates the traditional pump shaft dynamic seal (packing seal or mechanical seal) and structurally eliminates the possibility of leakage.

Design standards:

Industrial grade: API 685 "Unscented Centrifugal Pumps for Petroleum, Petrochemical, and Natural Gas Industries" is the highest standard with extremely strict requirements for reliability and safety.

General industrial grade: ASME B73.3M is the most widely used magnetic pump standard for the chemical industry.

ISO 2858/ISO 5199: International General Standards.

2、 Detailed explanation of structure and working principle
The core of a magnetic pump lies in "magnetic transmission" and "passive lubrication cooling cycle".
Functional description of key components:

Magnetic coupler:

External magnetic cylinder: connected to the motor shaft, usually containing a rare earth permanent magnet (such as neodymium iron boron NdFeB) with low temperature resistance but strong magnetic force; Or samarium cobalt SmCo, with high temperature resistance.

Internal magnetic cylinder: connected to the pump shaft, also containing a permanent magnet ring, enclosed in an isolation sleeve.

Working principle: The motor drives the outer magnetic cylinder to rotate, and its magnetic field penetrates the air gap and isolation sleeve, driving the inner magnetic cylinder to rotate synchronously, thereby achieving non-contact transmission of torque.

Isolation sleeve: This is the core static sealing barrier of the pump, usually made of high resistivity corrosion-resistant metals (such as Hastelloy, titanium) or ceramics. It must be thin enough to reduce eddy current losses and strong enough to withstand system pressure.

Bearing system:

Location: There are two sets of sliding bearings at the pump end, located on the impeller side (front bearing) and the inner magnetic cylinder side (rear bearing).

Material: It must rely on the lubrication of the conveyed medium, commonly using silicon carbide (SiC), which is recommended as the first choice by API standards due to its extremely high hardness, wear resistance, and good self-lubricating properties. Carbon graphite, hard alloy, etc. are also used.

Circulation and cooling system:

Internal circulation: A small stream of medium (about 1-5% flow rate) is introduced from the high-pressure area of the pump, which flows through the rear bearing, rotor chamber (cooling the inner magnetic cylinder and isolation sleeve), front bearing, and finally returns to the low-pressure suction port of the pump. This cycle lubricates the bearings, cools the magnetic steel, and isolates the sleeve.

External cooling: For high-temperature, easily vaporized, or low lubricious media, it is usually necessary to install a cooling jacket on the outside of the isolation sleeve or pump cover, and pass cooling water to enhance heat dissipation and prevent the media from vaporizing in the rotor cavity.

3、 Core advantages
100% leak free: The static sealing design fundamentally solves the problem of leakage of toxic, harmful, flammable, explosive, and expensive media, ensuring safety and environmental protection.

Easy maintenance: No need to maintain or replace mechanical seals, avoiding complex alignment work. The replacement of vulnerable parts such as bearings is relatively easier for shielded pumps (usually on-site).

High reliability: The transmission components have a relatively simple structure and no mechanical wear (magnetic transmission is non-contact).

Overload protection: When the pump end is overloaded or stuck, the inner and outer magnetic cylinders will "slip", protecting the motor from being burned out.

Modular design: usually a pullback design, which eliminates the need to disassemble pipelines when repairing internal components.

4、 Main drawbacks and limitations