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Sulphuric Acid on the WebTM Technical Manual DKL Engineering, Inc.

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Sulphuric Acid on the Web

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DKL Engineering, Inc.

Handbook of Sulphuric Acid Manufacturing
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Preface
Contents
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Sulphuric Acid Decolourization
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Preface
Table of Contents

Process Engineering Data Sheets - PEDS
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Introduction

Bibliography of Sulphuric Acid Technology
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Preface
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Sulphuric Acid Plant Specifications
 

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Instrumentation - Pressure
August 21, 2001

Introduction
Installation
Ranges
Chemical Seals
Associated Links

Introductionpressgauge.GIF (7302 bytes)

Pressure measurements are taken where ever th information will be useful for controlling, monitoring, or trouble shooting the process or equipment.   Critical pressures should be available in the control room and if appropriate alarm levels set to inform operators when the pressure is outside its normal range.

Pump discharge pressures allow the operator to determine pump performance by taking pressure measurements and estimating flows from pump curves.   Differential pressures if monitored and recorded over long periods of time can indicate when a catalyst bed, heat exchanger, column, filter, etc. is fouling or plugging up.

Installation

Pressure gauges should always be mounted with an isolation valve so the gauge can be removed safely during operation.  The connection for the gauge is 1/2" NPT.  The connection to the process line and valve can be any size as long as the connection is reduced to 1/2" NPT for mounting the gauge.

Ranges

Standard ranges are given below.  When specifying ranges the closes standard range should be used that adequately covers the anticipated operating range (ie. minimum to maximum).

psi Figure Interval Graduations kPa Figure Interval Graduations
15 1 0.1 100 10 1
30 5 0.2 160 20 2
60 5 0.5 250 50 2
100 10 1 400 100 5
160 20 1 600 100 5
200 20 2 1000 100 10
300 50 2 1600 200 20
400 50 5 2500 500 20
600 50 5 4000 1000 50
800 100 10 6000 1000 50
1000 100 10 10000 1000 100

Chemical Seals

Chemical seals should be considered where:

Based on the above guidelines, chemical seals are required on all strong acid, weak acid, molten sulphur and wet process gas services.  Utilities such as air, water, steam, cooling water, process water will not require chemical seals.

Chemical seals come in a variety of materials including metals, PTFE, and elastomers.  Metals such as 304 SS, 316 SS, Hastelloy C (alloy C-276), tantalum, Carpenter 20, Nickel 200, Monel 400, Inconel 600 and titanium are available.  Elastomer materials include viton, Buna N and neoprene.