CS and LTCS composition 1

[Totino_Vogt]

Dear all,
A customer is asking for a specific requirement of Silicon content on CS and LTCS materials.
Here an extract of customer's specification: "CS or ITCS shall be fully killed with a minimum Silicon content of 0.15% wt"
It sounds strange considering ASTM regulation. Please, can you help me to understand the reason of this requirement?
Many thanks for your help.

 

[weldstan]

This is not so atypical a requirement from a number of petrochemical owners. I saw it numerous times during the 1980's and early 1990's.

 

[SJones]

A means of controlling sulphidation corrosion. See API RP 939-C.

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/in/drstevejones

All answers are personal opinions only and are in no way connected with any employer.

 

[Totino_Vogt]

Dear,
Thank you for your feedback.
Anyway customer continues asking fon Silicon content and not Sulfur.
Can I underline him it is a mistake?
Thanks

 

[david339933]

So you decide to join Eng-tips to ask your one question....get answers regarding sulfidation corrosion of refinery components and don't have the sense to actually look into it? I had no idea what it was either, but in five minutes on google I see exactly what they are talking about....and tend to agree with them....you are wasting peoples time.

 

[SJones]

can I underline him that it is a mistake

You can, naturally, attempt that course of action, but don't be surprised if it produces some irritation.

The customer is requesting the silicon content as a means of controlling sulphidation corrosion from exposure to the process environment. It is nothing to do with the sulphur content of the steel.

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/in/drstevejones

All answers are personal opinions only and are in no way connected with any employer.

 

What are LTCS and ITCS?
Are folks making up acronyms again?

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

 

[Totino_Vogt]

The customer is requesting the silicon content as a means of controlling sulphidation corrosion from exposure to the process environment. It is nothing to do with the sulphur content of the steel.

Dear Steve,
Many thanks for your help and explanation.
We didn't understandard the reason why customer's asking for Silicon content instead of Sulphur, now it's clear.
I wish you a great day

 

[Totino_Vogt]

So you decide to join Eng-tips to ask your one question....get answers regarding sulfidation corrosion of refinery components and don't have the sense to actually look into it? I had no idea what it was either, but in five minutes on google I see exactly what they are talking about....and tend to agree with them....you are wasting peoples time.

Dear,
You are not obliged to answer to my question and waste your time.
Thank you!

 

[SJones]

What are LTCS and ITCS?
Are folks making up acronyms again?

Not really. LTCS, low temperature carbon steel, is a standard term in piping materials for impact tested material, typically -46 deg C, and typically ASTM A333 Gr 6 etc. "ITCS" is a bit of a new one on me - hazarding a guess at: Intermediate Temperature Carbon Steel, i.e., material designated for normal operating temperature ranges before specific low and high temperature steels are required. Perhaps, somebody would confirm the latter, or correct it.

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/in/drstevejones

All answers are personal opinions only and are in no way connected with any employer.

 

Thanks SJones,
Seems like 20 years of schooling and 30 years in welding and metallurgy was not enough for me ...

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

 

[weldstan]

ITCS may be a typo noting the location of I and L on the keyboard.

 

[PDal]

ITCS is Impact Tested Carbon Steel

 

PDal,
I suspect this originated with asset management consulting engineers, who are some of the worst offenders.
My theory is businesses do this to help legitimate their services and expertise.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

 

[mrfailure]

Totino, welcome to our forum! You asked a very good question that has stimulated discussion and elicited information I never knew but should. Look forward to your participation.

 

[Totino_Vogt]

Dear ones,
Thank you all for your help and collaboration!
As @PDal wrote, I confirm ITCS is the acronym of "Impact Tested Carbon Steel".
Hope to be able to discuss with you in the future!

 

Why stop there?
I propose LTITCS - 'Low Temperature Impact Tested Carbon Steel'

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

 

[bobjustbob]

LTCS is vague but does indicate that the steel is intended for use at low temperatures. ITCS, impact tested carbon steel, doesn't really tell you much other than someone did some charpies on a test bar. If I impact test WCC at -50F and get 7 ft-lbs is that an ITCS?

Bob

 

[DekDee]

The terms " ITCS" and "LTCS" are used extensively in the LNG construction industry to easily identify multiple types of carbon steel on the project.
As an example these were materials on a recent Chevron LNG project.

Low Temperature Carbon Steel is the acronym used in the Piping Material Class Index.
The first three line classes below fall under this material type.

Impact Tested Carbon Steel
Impact Tested Carbon Steel + Nace
Impact Tested Carbon Steel + Nace + Cladding
High Yield Carbon Steel
Cement Lined Carbon Steel
PTFE Lined Carbon Steel
Carbon Steel + Alloy Cladding

Hope that helps,
Cheers,
Shane

 

[SJones]

If the material fails, does it go LTITs up?

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/in/drstevejones

All answers are personal opinions only and are in no way connected with any employer.