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energy is transmitted to the hazardous Where corrosion inhibitors are in and may not be fool-proof for remote IndiaChemTrade
ChemImpex
fi eld area for an explosive spark to be use. critical assets. Sensor Node
produced. In batch processes, where corrosive For subscribers only Free for subscribers of Chemical Weekly
constituents are concentrated due to A typical remote corrosion moni- Battery
ChemImpex, the trade database, tracks, on a daily
Probe fi tting styles repeated cycling. toring system consists of various sen- IndiaChemTrade provides consolidated trade statistics
basis, exports and imports of chemicals and related
There are two fundamental fi t- Where process feedstock is sors, a power supply, a data acquisi- of India. The information provided here is based on the
products through the major ports in India — a vital
ting styles for corrosion probes. Fixed changed. tion system and a cellular network for annual trade data published by the Directorate General
source of commercial intelligence. Find out on-line
styles have typically a threaded or Where plant output or operating data transfer. Systems sometimes use of Commercial Intelligence and Statistics, Government
how international markets are moving; where your
fl anged attachment to the process plant. parameters are changed from design electrochemical multi-probe instru- of India. The database can be searched by: Chemical
competitors are exporting and at what price; where
For these, removal can only be accom- specifi cations. ments with data collection capabili- Name/Harmonised Code to obtain the consolidated
imports are coming from and how
plished during system shut down or by In the evaluation of corrosion ties. These instruments are capable of their prices are trade (import or export) in that item; or by Country to
Communication Unit
isolation and depressurization of the behaviour of various alloys. measuring and recording many key Sensing Unit obtain the trade (import or export) in all chemicals and
moving. Download all this data, seamlessly, for a
sensor location. Where induced potential shifts parameters that contribute to corrosion related products between India and that country
Microcontroller
small fee — online, anytime, with no hassles.
are used to protect systems and/or (Figure-25).
Sensor
ADC
From time to time, corrosion cou- structures. ChemXchange Transceiver
A sentinal hole is drilled through pons and probes require removal and Where product contamination due CONCLUSION
Open to all registered users — no subscription required
the sacrifi cial anode upto a limiting replacement. It is sometimes more con- to corrosion is a vital concern. In any corrosion monitoring system,
ChemXchange — the chemical exchange with a difference — is where you can identify your buyers and sup-
thickness (just suffi cient to provide venient to be able to remove and install it is common to fi nd two or more of the
plyers on-line, any time. This unique platform is free to all advertisers in the print version of Chemical Weekly.
protection to the shell). Once the sensors while the process system is Corrosion monitoring may be used techniques combined to provide a wide Fig. 25: Basic Mode of a Wireless Sensor Network showing sensing unit, microcontroller,
anode is corroded upto that limit, operational. To facilitate this, there are in virtually any industry where corro- base for data gathering. The exact tech- communication unit (transceiver), and a battery power pack
For more information contact: 022-24044477. Fax: 022-24044450
the liquid starts coming out drop two distinct systems which permit sion prevention is a primary require- niques used depend on the actual pro- answer to the question of whether more Corrosion monitoring remains a valuable
Email: corporate@chemicalweekly.com or log on to chemicalweekly.com
by drop through the hole. removal/installation under pressure. ment. Some examples of industries and cess fl uid, alloy system, and operating corrosion is occurring today as com- weapon in the fi ght against corrosion,
Inspection by Drilling A sentinel In refi nery and process plant envi- specifi c areas of interest include, but parameters. pared to yesterday. Using this informa- thereby providing substantial economic
Hole ronments where pressures are nor- are not limited to oil & gas, refi ning, tion, it is possible to qualify the cause benefi t to the user and helping manage
mally less than 2000 psi, a Retract- pulp & paper, utilities, petrochemicals & Corrosion monitoring offers an of corrosion and quantify its effect. asset integrity effi ciently.
Fig. 24: Visual Inspection of Heat-Exchanger able System is used. This consists chemicals.
rity. Figure-24 illustrates the methodo- of a packing gland (stuffi ng box)
logy of this technique. and valve arrangement. Corrosion monitoring of remotely
For environments such as those located assets
Instrumentation experienced in oil/gas production In its simplest form, remote systems
There exists a variety of instrument where pressures of several thou- collect data from remote monitoring
options associated with the various sand psi are experienced, a special units (RMUs) at remote fi eld sites and
corrosion monitoring techniques. These High Pressure Access System is then deliver the information to compu- Missed a copy !!!
include Portable Meters and Data Log- used. This permits the safe and easy ters in the offi ce. Alternatively, a remote
gers, Field-Mounted Data Loggers, and installation/removal of corrosion monitoring unit can observe corrosion For Digital Edition of this month’s issue & all other past issues
Field-Mounted Transmitters. monitoring devices at working pres- in many different places simultaneously,
sures up to 3600 psi. allowing engineers to detect instances
In some applications such as those of corrosion as they occur. It also
experienced in oil/gas production and Common applications of corrosion allows engineers to more effi ciently deter- Visit www.hpicindia.com
refi ning, instrumentation is required monitoring techniques for asset mine the cause of corrosion and take Mrs. Usha S. - usha@hpicindia.com
to be certifi ed for use in “hazardous integrity management: proactive action(s) before a catastrophic
areas”. For portable instruments this Corrosion monitoring is typically failure occurs. The systems can be
is most often achieved by having the used in the following situations: confi gured to trigger automatic alarms PDF copies available for download
equipment certifi ed as “intrinsically Where risks are high – high pres- when dangerous or destructive upset
safe” by a recognized authority such sure, high temperature, fl ammable, conditions are detected. This allows Register Now
as DGFASLI (India), BASEEFA (UK), explosive, toxic processes. personnel to respond and act quickly
UL (USA), ITS (USA), or CENELEC Where process upsets can cause before further damage occurs to the
(Europe). For hardwired continuous high corrosivity. assets. However, corrosion monitoring Contact: For Subscription : Mrs. Usha S. - usha@hpicindia.com
monitoring electronics, isolation bar- Where changes in operating condi- without a remote monitoring unit might For Advertising : Mr. Vijay Raghavan - vijay@hpicindia.com
riers can be used to ensure that, in the tions can cause signifi cant changes be restricted to spot checks at only one
event of a fault condition, insuffi cient in corrosion rate. location during a limited time interval
184 Chemical Weekly July 2, 2024 Chemical Weekly July 2, 2024 185
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