Flange Isolation Joint Gasket Kit - How and Where to use?

[Music]

welcome to harded engineer.com I am vun

pel in this video I will explain to you

about flange isolation joint and the

gasket kit that used to achieve this

objective I will explain to you about

what is flange isolation joint why and

where it is use components of the

isolation joint and proper installation

of flange isolation joint

so watch the video to get the complete

understanding of this topic and don't

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the right hand side of your screen so

let's start with video I'm thankful to

GPT Industries for allowing me to use

their propriety material in this video

so the first topic is what is the flange

isolation joint well don't get confused

by the name it is not a blinding of the

flange that stop the

fluid this is different kind of

isolation it is going to isolate the

current yes the current in the PIP

Flinch you H it right a Flinch isolation

gasket kit is used to protect pipeline

flanges from the corrosion that happens

due to galvanic

corrosion I will explain to you about

how this corrosion work in the pipeline

in more detail in the upcoming

slides here you can see in the photo

that a specially designed gasket kit

that involves gasket non-metallic sleeve

of STS and non-metallic washer so now

where we can see this isolation gasket

kit so the first place where you can see

this gasket kit is when this similar

metal joints are involved for example

you can see that here in the photo one

one side flange is of carbon steel and

other side is of Stillness steel you can

see that carbon steel flange is badly

cored in both this photo as no isolation

gaskets were used so why this happened

that I will explain to you in next slide

here the second place where you can see

the flange isolation gasket kit it is

when the pipeline change from above

ground to underground or other way

around usually what happens the

underground pipelines are protected by

cathodic protection so the external

power supply is provided to the pipeline

and when the pipeline become above

ground you have to cut off the power

otherwise what will happen you will lost

electricity and also it will damage the

paint of the above ground piping so when

you use this isolation gasket joint you

can prevent the current leakage from

above ground pipeline From The

Underground pipeline so this gasket kit

use in that places as

well so now we know why and where the

flanges isolation gasket kits are used

so let's learn how to protect pip

flanges by using this kit as I explained

to you earlier the main reason behind

the corroded flange is galvanic

corrosion so here you can see that

Stillness steel and carbon steel flanges

are joined without an isolation casket

this happens why this corion happens is

because this material are having a

different value of galvanic voltage

here the chart shows the various

commonly used material and the galvanic

value corresponding to that

material material at the top here you

can see that gra fight gold silver this

materials are more noble as compared to

magnesium Jin that is at the bottom of

the chart what is the meaning of this

let's say that more noble noble material

means those who are at the top of the

chart they call more noble material as

compared to the material that are bottom

of the chart so what is happen Happening

Here is that the material at the top

will not get corroded easily so even if

they are in use in the corio environment

they will remain in a good condition

whereas the material which is the bottom

of the chart if you put in normal atmic

environment then also it will get cored

so here you can see that stainless steel

is above the carbon steel what do that

mean that if you connect the carbon

steel and stainless steel in that case

St steel will work as a cathode and and

carbon steel work as a anode so the

anode will get corroded and cathode will

get protected so that is what happening

in our dissimilar flange

connection so as you know now that what

is galvanic corrosion and why it is

happening so to start corrosion you need

four things that to be present at the

same time so what are these four things

are first is anode cathode metallic path

and electrolyte here in the flange you

can see all of them in the photo I have

highlighted so in idal condition we have

a three things present at all the time

in any fled connection first is anode

that is L Noble material here in case

carbon steel cathode that is St steel

which is work as a more noble material

and the metallic path that is happening

in three places first through St then

through St and nut and the flange to

flange that is through gasket so if the

flange connection is free from

electrolyte you don't need any

protection I mean electrolytes are

always present electrolyte what will

happen they will provide the path to the

electron to pass from one material to

other material it will jump that way so

in the real life you have a rain water

moisture Sands and many more things that

work as a electrolyte so the protection

of the flange is required by how so you

have to eliminate one of these component

like fire triangle if you remove any one

component fire fire will stop similarly

here out of this four component if you

remove any one of them it will stop the

corrosion let's see what we can remove

here you can see that we cannot remove

anode cathode and electrolyte presence

because it is always going to be there

either rain moisture or something is

going to be there in the atmosphere so

you only thing that left to remove is

metallic path and the flange isolation

gasket kit does the same it stop the

flow of electron from cathode to anode

this way you can protect your flange now

how it will done let's see by each

component the isolation gasket kits

include a specially designed

non-conductive gasket that provides the

necessary sealing as well as the

isolation usually if you use the

metallic gasket what will happen the

current flow will be continue means your

path is from one FL to Second flange

will remain as it is but this gasket

will stop that so we have prevent first

connection first path to prevent the

isolation now the second thing is the St

sleeve you know that in flange

connection we use metallic studs so this

metallic stud is also work as a path so

if you cover that stud with non-metallic

material it will prevent direct contact

between flanch and St so that way you

eliminate the second path here in the

image you can see that now the third

component that is non-metallic washer

why we use non-metallic washer so if you

know the third part that is through nut

and flange connection now nut is going

to be fixed on a stur okay so St will

pass current to the nut and nut will

connect it is it will come in contact

with the flange phase so there is a path

so we want to cut this path as well so

if you put non-metallic washer in

between the nut and flange it will

prevent the third path as well and to

prevent the damage of this non-metallic

stud we use metallic washer as a backup

so this way we can eliminate all three

path that will initiate the

corrosion this is how we are going to

achieve isolation of the two dissimilar

flanges similarly in above ground and

underground Cas here I have explained to

you with respect to dissimilar material

but if you consider the same thing with

underground above ground pipe with

cathodic prote same way you can

eliminate the direct flow of electricity

from one side of the flange to other

side of flange and that way we can

protect our above ground underground

piping

flanes to achieve the full benefits of

this isolation kits there are some good

practice that you have to follow here I

have so two of them the first is a gap

between the two flanges this should be

avoided in all cases now see that there

are two type of Gap will happen when we

create the flange joint one is the top

of the gasket here you can see that I

have highlighted the gasket so whenever

we use gasket there will be Gap at the

top of the face of the flanges so this

Gap will work as a trap for the Ice

Water anything that electrolyte so

whenever there is electrolyte it will

become it will create another path to

flow the current so the our purpose of

the isolation will not work so we have

to make sure that whenever we use gasket

kit the top face of the flange and our

gasket should be in the line similarly

the gasket inside the pipe what is

happening the idea of the gasket and

idea of the pipe is not same what is

going to happen if ID of the gasket is

lce then there will be a chances of

vortex at the inside the gap between the

flange and whenever there is a vortex

there is a chance of corrosion this will

really help you to protect your

dissimilar flanges as well as above

ground underground pipe connection from

the damage hope you like this video

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