Welcome to DTC – Professional Manufacturer & Global Supplierxingyaliu60@gmail.com
Welcome to DTC – Professional Manufacturer & Global Supplierxingyaliu60@gmail.com
1. The Grooved Concept Instead of welding or threading, a groove is rolled or cut into the end of the pipe. A Grooved Coupling (containing a C-shaped gasket) is then bolted over the two pipe ends to create a seal. 2. Rigid vs. Flexible Couplings Rigid Couplings: Create a joint that behaves like a we …
1. What is a Mill Test Certificate (MTC) 3.1? Governed by EN 10204, a 3.1 certificate is a document issued by the manufacturer (independent of the production department) certifying that the products comply with the order requirements. 2. Essential Data Points Chemical Composition: Heat analysis of C …
1. The Spiral Wound Gasket (SWG) The most common gasket for high-pressure flanges (ASME B16.20). It consists of a V-shaped metallic strip spirally wound with a soft filler (typically Graphite or PTFE). Inner Ring: Prevents “buckling” of the windings into the pipe. Outer Ring: Centers the …
1. What is “Duplex”? Duplex stainless steels have a two-phase microstructure consisting of grains of both Austenitic and Ferritic stainless steel (roughly 50/50). This unique combination provides the best of both worlds: the corrosion resistance of 300-series stainless and the high yield …
1. The Role of Isolation and Measurement Standard flanges provide connectivity, but special operations require dedicated components for flow measurement and absolute isolation. Spectacle Blinds: A dual-part component (one solid plate, one open ring) resembling spectacles. It provides a positive mech …
1. The Scope of Large Diameters While ASME B16.5 covers flanges up to 24″, ASME B16.47 takes over for sizes from 26″ to 60″. 2. Two Different Philosophies Series A (MSS SP-44): Thicker, heavier, and features larger bolts. It is designed to handle higher external loads. Series B (AP …
1. Raised Face (RF) – The Workhorse The most common facing type. It features a small area (usually 1/16″ or 1/4″ high) raised above the bolting circle. This concentrates more pressure on the gasket, ensuring a reliable seal for standard Class 150-600 applications. 2. Ring Type Join …
1. FBE (Fusion Bonded Epoxy) A single-layer, thermoset polymer coating. It is applied as a dry powder that melts and cures onto a heated pipe. FBE provides excellent adhesion and resistance to cathodic disbondment but is susceptible to mechanical damage during transport. 2. 3LPE (3-Layer Polyethylen …
1. The 300 Series Baseline Stainless steel is defined by its Chromium content, which forms a protective “passive layer.” Grade 304/304L: The most common “18/8” stainless steel. It offers excellent corrosion resistance in fresh water and mild atmospheric conditions. Grade 316/ …
1. The Foundation of Forged Carbon Steel In the PVF industry, choosing the right carbon steel grade is determined by the design temperature of the system. ASTM A105: The standard for forged carbon steel piping components for ambient and higher-temperature service. It is the default material for flan …
1. Mechanical Classification Valves are the “controllers” of a piping system. To select the right one, you must first define the intent: Isolation (On/Off): Designed to be fully open or fully closed. Gate Valves: Use a wedge-like disc; ideal for straight-line flow with minimum pressure d …
1. The Mechanics of the “Flange” and “Web” Structural steel profiles are engineered to maximize load-bearing capacity while minimizing weight. H-Beams (Wide Flange): Feature wider flanges and thicker webs. They are the preferred choice for pillars and columns because they off …
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