1. introduction categories/kinds of pressure sensing accessories purpose references 2
TRANSCRIPT
PRESSURE SENSOR
ACCESSORIES2008-CHEM-832008-CHEM-632008-CHEM-27
2008-CHEM-129 2008-CHEM-147
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Introduction
Categories/Kinds of Pressure Sensing Accessories
Purpose
References
SYNOPSIS
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Definition To avoid excessive maintenance problems
and damage of instruments, special accessories provide a safe and reliable working of instrument as well as the process
Working Principle
INTRODUCTION
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Valve Manifolds
Bleed (Vent) Fittings
Pressure Pulsation Damping
Fill Fluid Mechanism
Remote and Chemical Seals
CATEGORIES/KINDS OF PRESSURE SENSING ACCESSORIES
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Three Valve Manifold
Valve Manifolds
A fourth valve called a “bleed” valve used to vent trapped fluid pressure to atmosphere
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Two block valves are left open to allow process fluid pressure to reach the transmitter. The equalizing valve is left tightly shut so no fluid can pass between the “high” and “low” pressure sides
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Five Valve Manifold
For normal operation and maintenance Never open while both block valves
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Bleed (Vent) FittingsClose-up views of a bleed fitting both assembled (left) and with the plug fully extracted from the fitting (right)
Bleed fittings installed in two different ways
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Pressure Pulsation Damping
An oil-filled pressure gauge Snubber
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Electrical Pressure Snubber
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Fill Fluid Mechanism
Fill the pressure sensor mechanism with a clean liquid (called a fill fluid) Transfer pressure from the process fluid to the fill fluid
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Remote and Chemical Seal
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Pressure gauge with a chemical seal diaphragm
Thin metal isolating diaphragm Chemical Seal Diaphragm
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Electronic PT Remote Seal
Capillary tube with coiled metal (“armor”) sheath
Close-up view of the sealing diaphragm with corrugated design
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Water Traps & Pigtal Siphon
Pigtail Siphons Transmitter with Pigtail Siphons
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Singh S.K., “Industrial Instrumentation and Control”, Tata McGraw Hill Publishing Company Limited New Delhi, Edition Ist, Chapter 12, Page 393-397
Tony R. Kuphaldt, Jan11, 2009, lessons in industrial instrumentation, Creative Commons, page 397-425
http://iamechatronics.com/notes/general-engineering
Dr. Shahid Naveed, Dr. Ing Naveed Ramzan & Ms. Sana Yousuf 2011, Industrial instrumentation, First Edition, Allied Book company, Pages 77-78
REFERENCES