Industrial News
Necessity of Heat Exchanger Maintenance and Repairs

Necessity of Heat Exchanger Maintenance and Repairs

Why is the repair and maintenance of heat exchangers essential? In oil refining and chemical production, the fluids circulating through heat exchangers often contain deposits like coke, posing a risk of corrosion. Over time, these conditions lead to the accumulation of scale and rust in crucial parts such as heat exchange tubes and shells. This not only diminishes heat transfer efficiency but also reduces flow cross-sections, elevating resistance and potentially causing blockages. Moreover, dielectric...

Feb 21, 2021 Industrial News
Heat Exchanger Cleaning Techniques

Heat Exchanger Cleaning Techniques

What are the maintenance standards for heat exchangers? (1) During the operation, pulling, loading, transportation, and hoisting of heat exchanger bundles, avoid directly tying the exposed wire rope to prevent damage to the heat exchange tubes. (2) Clean the internal and external structures of the tube bundle. (3) Process gaskets as a whole when tube boxes and floating heads have partitions to ensure effective sealing without defects. (4) Tube bundle plugging: Limit the number of blocked pipes within...

Feb 21, 2021 Industrial News
How Is Routine Maintenance Conducted for Heat Exchangers?

How Is Routine Maintenance Conducted for Heat Exchangers?

The heat exchanger's operational cycle must align with the production device's production cycle to ensure normal operation and meet production requirements. Regular inspection, supervision, and daily maintenance and repairs are essential. Ensuring stable pressure is crucial, and overpressure operation is strictly prohibited. Leakages, often occurring during line sweeping start-ups and shutdowns, particularly in the floating head, require careful attention. When repairing, checking the pressure...

Feb 07, 2021 Industrial News
Five Inquiries Regarding Finned Tubes, Wet Air Coolers, and Heat Exchangers

Five Inquiries Regarding Finned Tubes, Wet Air Coolers, and Heat Exchangers

How are Finned Tubes Classified in Finned Tube Heat Exchangers? Finned tubes can be categorized into two fundamental types, longitudinal and radial, based on their structural form. Other variations are developments or modifications of these two types. Fin shapes include round, rectangular, and needle-shaped. Additionally, fins can be positioned outside the tube (outer fin tube) or inside the tube (inner fin tube), or a combination of both. Manufacturing processes classify finned tubes into integral...

Feb 05, 2021 Industrial News
Eleven Inquiries Regarding Air Coolers, Heat Exchangers, and Condensers

Eleven Inquiries Regarding Air Coolers, Heat Exchangers, and Condensers

1. What are the Basic Types of Air Coolers? The fundamental types of air coolers include Horizontal Air Coolers, Vertical Air Coolers, and Inclined Air Coolers. 2. How to Classify Air Coolers According to the Cooling Method? Air coolers can be categorized based on the cooling method into Dry Air Coolers, Wet Air Coolers, Dry and Wet Combined Air Coolers, and Spray Air Coolers on Both Sides. 3. How to Classify Air Coolers According to the Type of Their Tube Bundle Layout? Air coolers can be classified...

Feb 01, 2021 Industrial News
11 Inquiries about Categories of Heat Exchangers and Air Coolers

11 Inquiries about Categories of Heat Exchangers and Air Coolers

1. Definition of Wet Air Cooler A wet air cooler is a type of air cooler where a slight structural modification allows for the spraying of a small amount of water onto the fin surfaces. This addition of water facilitates evaporation, enhancing heat transfer and improving overall heat transfer efficiency. 2. Classification of Heat Exchangers based on Heat Transfer Principle Heat exchangers, according to the principle of heat transfer, can be categorized into three types: mixed, regenerative, and...

Jan 25, 2021 Industrial News
How Many Types of Pressure Tests Exist?

How Many Types of Pressure Tests Exist?

The pressure testing of a heat exchanger involves both hydraulic and pneumatic tests. In principle, the primary method for pressure testing is the hydraulic test, commonly referred to as the hydrostatic test when clean water is the testing medium. If other liquids are utilized, they must be non-hazardous, and their temperature should remain below the boiling point. When conducting a hydraulic test with a flammable liquid, the test temperature must be below the liquid's flash point. Additionally,...

Jan 19, 2021 Industrial News
Four Inquiries Regarding Heat Exchangers

Four Inquiries Regarding Heat Exchangers

1. How to Compare the Indicators of Heat Exchange Equipment? Different types of heat exchange equipment can be compared based on factors such as high efficiency, compact structure, material savings, low pressure drop, reliable structure, low manufacturing cost, easy installation, maintenance, and long service life. 2. How to Describe the Model of a Heat Exchanger? DN represents the nominal diameter of the heat exchanger, indicating the inner diameter of the rolled cylinder and the outer diameter...

Jan 11, 2021 Industrial News
Queries Regarding Heat Transfer in Fluids and Classification of Heat Exchangers

Queries Regarding Heat Transfer in Fluids and Classification of Heat Exchangers

1. If the hot fluid is inside the tube while the cold fluid is outside, how do the two fluid transfer heat through the wall? It includes the following three processes: (1) Heat is transferred to the tube wall by heat fluid convection; (2) Heat from the inner wall surface is transferred to the outer wall by heat conduction; (3) Heat from the outer wall surface is transferred to the cold fluid by convection.   2. What are the requirements for...

Jan 04, 2021 Industrial News
Eight Inquiries Regarding Heat Exchangers

Eight Inquiries Regarding Heat Exchangers

1. What does test pressure signify? The test pressure is the pressure applied during the pressure test at the tube pass and shell pass. 2. Define design temperature. Design temperature is the set temperature of the element metal during normal operation of the heat exchanger. It is determined by the design load conditions and pressure. 3. How does a heat exchanger facilitate heating? In a typical wall heat exchanger, heat transfer primarily occurs through conduction and convection. The heat fluid...

Dec 25, 2020 Industrial News
Inquiries about Tube & Shell Passes, Working & Design Pressure of Heat Exchanger

Inquiries about Tube & Shell Passes, Working & Design Pressure of Heat Exchanger

1. What constitutes the tube pass and shell pass in a heat exchanger? The tube pass is the section of the heat transfer tube channel that facilitates the flow and connection of the medium. The shell pass is the portion of the channel where the medium flows around the exterior of the heat transfer tube, connecting with one another. 2. How is the count of tube passes and shell passes determined in a heat exchanger? The number of tube passes indicates how many times the medium moves back and forth...

Dec 07, 2020 Industrial News
What Constitutes the Nominal Diameter and Length of Heat Exchangers?

What Constitutes the Nominal Diameter and Length of Heat Exchangers?

What does the nominal diameter of heat exchangers signify? For coiled cylinder heat exchangers, the nominal diameter (DN) is determined by the inner diameter of the cylinder. In steel cylinder heat exchangers, the nominal diameter is based on the outer diameter of the steel tube. How is the nominal length of the heat exchanger defined? For straight heat exchange tubes, the length of the straight tube section becomes the nominal length (LN). In the case of U-shaped tubes, the nominal length (LN)...

Dec 02, 2020 Industrial News