Page 22 of Pressure Vessel Industry News

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?

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

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

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

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

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 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

What Is a Heat Exchanger and How Is Its Transfer Area Determined?

What is a heat exchanger? A heat exchanger is a device designed to transfer heat from a hotter fluid to a cooler fluid. What is the heat transfer area of a heat exchanger? The heat transfer area is calculated as the outer surface area of the tube, considering the outer diameter and deducting the length that extends into the tube sheet. In U-tube heat exchangers, the area of the U-shaped bend is typically excluded.

Dec 02, 2020 Industrial News

Main Structural Types of Pressure Vessels and Their Classification

1. What are the primary structural types of pressure vessels? Pressure vessels come in various structural forms, including spherical, cylindrical, box-shaped, and conical vessels. 2. What role do reaction pressure vessels play in production, and what are some common types? Reaction pressure vessels are essential for conducting physical and chemical reactions in the production process. Examples include reaction kettles, decomposition kettles, vulcanization tanks, decomposition towers, polymerization...

Nov 30, 2020 Industrial News

Alternative Methods of Classifying Pressure Vessels

What Other Classification Methods Are There for Pressure Vessels? Categorized by vessel wall thickness: Containers are classified as thin-walled (wall thickness ≤ 1/10 of the inner diameter) or thick-walled. Based on shell geometry: Containers are grouped as spherical, cylindrical, or special-shaped. By manufacturing method: Containers are identified as steel structure, casting, or machining containers. Considering structural materials: Containers are classified as steel structure, cast...

Nov 30, 2020 Industrial News

How Pressure Vessels Are Classified in the Capacity Regulation

To streamline safety management and regulatory oversight, the "Capacity Regulation" categorizes containers into three types based on pressure level, medium harm, and production role: Class I Pressure Vessels: Low-pressure vessels (excluding Class II and Class III). Class II Pressure Vessels: 1. Medium-pressure vessels (excluding Class III). 2. Low-pressure reaction and storage vessels with flammable or moderately hazardous media. 3. Low-pressure containers with extremely toxic and highly...

Nov 21, 2020 Industrial News

Classifying Pressure Vessels Based on the Principle of Action

Following the operational principle in the manufacturing process, pressure vessels are categorized into reaction pressure vessels, heat exchange pressure vessels, separation pressure vessels, and storage pressure vessels. When a pressure vessel performs multiple functions simultaneously, it should be classified based on its predominant process function.

Oct 30, 2020 Industrial News