News-Zhejiang Hongyuan Flange Co., Ltd. specializes in manufacturing high-quality flanges and stainless steel flange fittings, www.hongyuanflange.com

2025-10-05

Chemical flange PN series sealing surface types: characteristics and applicable scenarios full analysis

In the PN series of chemical flanges, common sealing surface types include protruding surface (RF), full flat surface (FF), concave convex surface (MFM), tenon groove surface (TG), ring connection surface (RJ), etc. Each type has unique characteristics and applicable scenarios, as follows: 1. Raised Face (RF) Features: The sealing surface is a smooth convex surface, with a simple structure and easy processing. Suitable for general media and pressure conditions, with moderate sealing performance.

2025-10-05

Installation and maintenance of clamping flange

1、 Installation process Pre-installation preparation Material inspection: Confirm that the specifications and materials of the clamping flange, sealing gasket, and bolt meet the design requirements. Check whether the flange sealing surface is flat, free of scratches or rust, and whether the gasket is damaged or aged. Tool preparation: Prepare torque wrench, clamping tool, level, angle ruler, wire brush, lubricant (such as molybdenum disulfide), etc. Pipeline straightening: Ensure that the axis of the pipeline is consistent with the centerline of the flange, and the deviation must meet the standard (such as when DN ≤ 300, the axial deviation is ≤ 1mm; when DN>300, it is ≤ 2mm). Flange and pipeline alignment

2025-10-05

Application of Stainless Steel Flanges in Industrial Pipelines

Stainless steel flanges are widely used in industrial pipelines. With excellent corrosion resistance, high strength, and good sealing performance, they have become key connecting components in multiple industries such as petroleum, chemical, food, pharmaceutical, and energy. The following is a detailed analysis of its specific application scenarios, advantages, and selection considerations: 1、 Core application scenarios of stainless steel flanges Oil and gas industry Application scenario: Pipeline systems for transporting media such as crude oil, natural gas, and liquefied gas. Advantages: Stainless steel flanges are resistant to hydrogen embrittlement and sulfide corrosion

2025-10-05

What are the standards for flange manufacturing?

The flange manufacturing standards cover multiple systems both domestically and internationally, including national standards (GB), mechanical industry standards (JB), chemical industry standards (HG), American standards (ANSI), Japanese standards (JIS), German standards (DIN), etc. Here are some specific flange manufacturing standards: 1、 Domestic standards National Standard (GB) GB/T 9112~9124-2010: Steel pipe flange standard, covering various types and parameters of flanges, integral steel pipe flanges, threaded steel pipe flanges with necks, welded steel pipe flanges, etc. Pressure marking: divided into PN marking and Class marking. The PN tag has 12 pressure marks

2025-10-05

Flange connection operation process

Flange connection is a commonly used detachable connection method between components such as pipelines, valves, and equipment. Its operation process must strictly follow the specifications to ensure sealing, safety, and service life. The following is a detailed flange connection operation process and key precautions: 1、 Preparation before operation 1. Material and tool inspection Flange: Confirm that the material (such as carbon steel, stainless steel), pressure rating, nominal diameter match the pipeline, and that the surface is free of defects such as cracks, sand holes, burrs, etc. Gasket: Select the appropriate material (such as metal wrap pad, rubber pad, PTFE pad) according to the medium, temperature, and pressure, and check the thickness uniformity and integrity. Bolt/Nut: Verify specifications (length, diameter)

2025-10-05

How to forge stainless steel flanges?

The forging process of stainless steel flanges includes key steps such as material selection and cutting, heating, free forging or die forging, post forging cooling and heat treatment, mechanical processing and inspection. The following are specific instructions: 1、 Material selection and cutting The first step in forging stainless steel flanges is to select high-quality steel billets as raw materials. These steel billets need to undergo strict inspection to ensure that their chemical composition and mechanical properties meet the forging requirements. When cutting, it is necessary to accurately cut the steel billet according to the design specifications of the flange to control the loss and cost of subsequent processing. 2、 Heating up

2025-10-05

The precision processing flow of large-diameter flat welding flanges

The finishing process of large-diameter flat welding flanges is a complex and meticulous procedure, mainly including the following key steps: I. Raw Material Preparation Material selection: High-quality thick steel plates are chosen as raw materials. Materials with good mechanical properties and corrosion resistance, such as carbon steel, stainless steel or alloy steel, are usually selected. Inspection: Conduct strict inspections on raw materials, including non-destructive testing methods such as ultrasonic flaw detection, to ensure that the raw materials have no defects such as delamination and slag inclusion. Ii. Preliminary Processing Cutting: According to the size requirements of the flange, high-precision cutting equipment is used to cut the raw materials to obtain flange blanks that meet the requirements. Pre-treatment: Pre-treatment is carried out on the cut flange blanks, such as deburring and rust removal, to enhance the quality and efficiency of subsequent processing. Iii. Forming Processing

2025-10-05

How to distinguish the authenticity of stainless steel flanges?

The authenticity of stainless steel flanges can be comprehensively judged through various methods. The following is the specific operation and principle analysis: 1、 Chemical reagent detection method (rapid preliminary judgment) 1. Nitric acid point experiment Principle: Stainless steel has corrosion resistance to concentrated nitric acid and dilute nitric acid, while ordinary carbon steel or low-alloy steel will be corroded. Operation: Dip a cotton swab into concentrated nitric acid (or dilute to an appropriate concentration) and drop it onto the surface of the flange. If there are no obvious signs of corrosion, it is stainless steel; If it quickly turns black or bubbles, it may be a counterfeit product. Attention: It is necessary to operate in a well ventilated area to avoid skin contact.

2025-10-05

What are the precautions during the installation process of the compression flange?

During the installation process of the compression flange, it is necessary to strictly control the details to ensure confidentiality, safety, and service life. The following are key precautions during the installation process, classified and explained according to the operation stage: 1、 Preparation stage before installation Material and specification matching Medium compatibility: Select the material of flanges, gaskets, and bolts based on the conveying medium (such as corrosive liquids, high-temperature steam, gases, etc.). For example, strong acid media require Hastelloy or PTFE gaskets, and high-temperature working conditions require heat-resistant steel bolts. Pressure rating matching: The pressure rating of flanges, gaskets, and pipelines should be consistent, avoiding