Chemical

Name:

NO:
Chemical injection

12.1:List chemical in use in your area and explain their hazards
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sodium Hypochlorite :Not flammable , Skin itching ,eyes itching
Poly electrolyte : Not flammable , Skin itching ,eyes itching
Corrosion inhibitor : Flammable ,Eyes Harmful
Scale inhibitor :Eyes and Skin itching
Biocide A :Toxic :Skin itching
Biocide B : Toxic :Skin itching
Oxygen Scavenger :Sore throat , Skin itching
Demulsifir :Flammable , Eyes Harmful , Skin itching
TEG : Toxic , Flammable ,Eyes harmful , Skin Itching

12.2 : Make a table and describe where they used and why ?
Sodium Hypoclorite

Poly Electrolyte

Scale Inhibitor

Biocide A

At the inlet of water
tank to kill bacteria

Before filters to
Before filters & well
collect particles for
heads to prevent
smoothening filtration corrosion

Corrosion Inhibitor

At the inlet of
stripping tower to
prevent scale

Injected into surge
vessel to kill aerobic
bacteria

Biocide B

Oxygen Scavenger

Demulsifir

TEG

Injected into surge
vessel to kill Nonaerobic bacteria

After stripping tower
to remove un
dissolved Oxygen

In inlet manifold
headers and DH
header for separation

Used to dehydrate
wet gas

of water

12.3 : Calculate the chemical injection rate . How do you convert L/D to PPM and PPM to L/d ?
LPD={Production (bbl) x PPM x 159}/10^6
GPD = {production (bbl) xPPM x42 }/10^6
PPM = {L/D x 10^6 } / {production (bbl) x 159}
12.4: Adjust the chemical injection rate _ is it necessary to have this checked everyday ?
Close chemical tank’s discharge valve
Check the rate of sight glass per minute
Multiply the number by 60 then 24 and divide the result to 1000
The result is the chemical injection per day
It is necessary to be checked daily because of any change in the rate could cause an
upset in the process
12.5 : Describe the correct protective clothing to wear when handling chemicals
-Plastic gloves
-Rubber Boats
-goggles/Face shield
-Face mask
-Rubber apron

12.6: What is the purpose of routine checks on chemical injection system and what are you looking
for?
To ensure that the chemical injection is going on with the specified rate
- Check the level in the tank
- Check the shower and eye wash station are available
- Check the pump is pumping
- Check for any leak
- Adjust the rate
12.7 : Receive and unload chemical deliveries taking all the necessary precautions
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check the chemical name
Check the MESC number of the chemical
Check for any leaking or damaged drums
Do not store the drums on each other
Do not mix different types of chemicals
Check the manifest how many drums is received

12.8 : Identify the chemical injection points in the various location of the fields
Demulsifir : (HP,IP,TEST) headers , DH header , SDH/SRT header
Scale inhibitor : Oxygen Stripping tower , main water injection header
Corrosion inhibitor : Disposal water tanks , wet gas header, some wellheads flow lines
Oxygen scavenger : Stripping tower outlet

Poly Electrolyte :dilution water filters inlet
Sodium Hypochlorite : Inlet of water tank
Glycol : gas plant
Biocide : water storage vessel
12.9 : Describe the effect of over and under dosage
Over dosage :
1- Gives reverse effect
2- Wasting for money
Under dosage :
Will not give the expected result
12.10 : What dose SHOC/M.S.D.S stand for and where you can you find it and how does it help you ?
SHOC is an abbreviation for Safe Handling Of Chemical
M.S.D.S is an abbreviation for Material Safety Data Sheet
It found posted near every chemical injection station , it gives vital information about the
injected chemical
Hazards, Symptoms , Prevention , fire fighting , First aid , Spillage
12.11: List the kind of problems you may face in your plant if the chemical injection fails , and you
do not

notice it for a long period
if the Demulsifir injection fails then a bad separation in all separators and trains will start
causing a lot of
problems like emulsion
If the corrosion inhibitor fails for a long period then corrosion in piping can take place resulting
a pin holes
In the pipes