Autobiography of a Corporate Slave

A Check Valve, Non Return Valve or a One way Valve is a valve that normally allows fluid (Liquid or Gas) to flow through only one direction. Check Valves are two port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave. Check Valves work automatically and most are not controlled by a person or any external control, accordingly, they do not have any valve handle or stem.   Check Valve Symbol on P&IDs. The Arrow shows the flow direction. Check Valves are automatic valves that open with forward flow and close with reverse flow. The pressure of the flow passing through the system opens the valve, while reversal of flow will close the valve. Types of Check Valves Swing Check Valve A basic Swing Check Valve consists of  a Body, a Bonnet and a disc that is connected to a hinge. The disc swings away from the valve seat to allow flow in forward direction, and returns to the valve seat, when u...

NACE International NACE International formerly known as National Association of Corrosion Engineers , established in 1943 by eleven corrosion engineers from the pipeline industry. The founding engineers were originally part of the regional group formed in 1930s when the study of cathodic protection was introduced. Since then NACE International has become the global leader in developing corrosion prevention control standards, certification and education. NACE has published standards since 1969 and has been accredited by the American National Standards Institute (ANSI), which is the U.S. member of International Standards Organisation (ISO) as a standards developer for many years.   NACE Standards for Sour Gas Applications Natural Gas and Crude Oil, as raw materials, contain greater or lesser high levels of Hydrogen Sulfur (H2S).  If there is a minimum amount of H2S and a minimum amount total pressure, such a mixture is known as "Sour Gas" or "Sour...

A Gate Valve is also know as Sluice Valve, is a valve that opens by lifting a round or rectangular gate/ wedge out of the path of the fluid. Gate valves are primarily designed to start or stop flow, and when a straight-line flow of fluid and minimum flow restriction are needed. In service, these valves generally are either fully open or fully closed. Construction of a Gate Valve Gate valves consists of three main parts: body, bonnet, and trim. The body is generally connected to other equipment by means of flanged, screwed or welded connections. The bonnet, which containing the moving parts, is attached to the body, usually with bolts, to permit maintenance. The valve trim consists of the stem, the gate, the disc or wedge and the seat rings. Discs of Gate Valve Gate valves are available with different disks or wedges. The most common types of Discs are : Solid Wedges Solid wedge is the most commonly used disk by its simplicity and strength. A valve ...

The size of pipes, fittings, flanges and valves are given in two Units NPS = Nominal Pipe Size (Inches) DN = Diameter Nominal (Metric) Following is the comparison : Diameter Nominal DN (mm) Nominal Pipe Size NPS (inches) 6 1/8 8 1/4 10 3/8 15 1/2 20 3/4 25 1 32 1 1/4 40 1 1/2 50 2 65 2 1/2 80 3 100 4 150 6 200 8 250 10 300 12 350 14 400 16 450 18 500 20 550 22 600 24 650 26 700 28 750 30 800 32 900 36 1000 40 1050 42 1100 44 1200 48 1300 52 1400 56 1500 60 1600 64 1700 68 1800 ...