Dear everyone,
I have a question about material selection for cooling water pump.
our cooling water (specific) condition is as follows:
- Temp.: 36 - 46 degree C
- Chloride (Cl-): 2200 ppm
- Fluoride (F-): 2000 ppm
Considering the chloride content, Duplex Stainless Steel is acceptible...
Dear everyone,
With reference to datasheet for deaerator storage drum, SS 316L cladding is required for deaerator storage drum.
my deaerator storage drum's condition is as follows:
- Temp.: 115 degree C
- Press.: 0.7 bar
- controled pH: 8.5 ~ 9.5 @ 25 degree C
- Oxygen Control: 7 bbp
CS + 3.0...
Dear all,
Licensor request to apply Alloy 825 on H2S service that H2S partial pressure is more than 900 mbar. (on equipment and piping)
service temperature is about 50 degree C, no chloride and vapor phase (compressor system).
However, I don't know the reason.
Is it caused by corrosion or...
All,
A333 and A334 are selected as material for LTCS item (-40 degree C).
However, CLIENT request KCS.
In accordance with ASTM specification for A333 and A334, these material is not specified as KCS.
exactly, it is not specified this is KCS or not.
Are A333 and A334 the KCS?
Please let me...
Hi, I'm Xeros.
Our client request that corrosion rate shall be estimated using Shell's Hydrocor Model.
However, I could not find the information about Hydrocor Medel.
Is it a document? or software?
Please let me know the information about Hydrocor Medel incuding purchase method. (I could not...
Dear all.
Hi, i'm Xeros.
Our Client request the Third party Expert/Agency for RBI/CRAS study. I have studied the API 581 and the related document.
However, I have no idea because of no experience. I understand somewhat, but I don't know what I do.
Could recommended the company for consulting...
Somebody said that using B7 (without protection) bolt for external SS flange (no thermal insulation) shall be inhibited because this is a dissimmilar metal contact and galvanic corrosion could occur (because rain water could be electrolyte).
Therefore isolation kit or coating shall be applied...
Hi,I'm Xeros
My Client requests to fabricate the reactor with 2.25Cr-1Mo-0.25V steels.
I heard that 2.25Cr-1Mo-0.25V steels has following advantages:
- High strength therefore thickness could be decrease
However, I think that 2.25Cr-1Mo-0.25V steels has more disadvantage as follows:
- High...
Hi, i'm Xeros
In accordance with API610, CI or CS could be used for the casing material.
I have question between CI and CS.
Sometimes, CI is used for casing material, sometimes CS.
Could i know the detailed reason why sometimes, CI is selected or sometimes CS?
Hi,
I'm Xeros.
I have an item that used ASS pipe, exactly SA376 TP 321.
I can't understand the difference between SA312 and SA376.
In accordance with description, description of SA312 is "Specification for seamless and welded austenitic stainless steel pipes" and SA376 "Specification for...
hi, i'm Xeros.
I understand that dual certified materials has the higher stress values for grade 304 and good weldability, good corrosion resistance for grade 304L.
Therefore, I want to apply the dual certified materials (grade 304/304L) in LNG plant project.
However, I have no reference for...
I have a question about NACE MR0175 - 2003 edition.
in accordance with para. 5.2 on NACE MR0175-2003 edition, Overlays applied to carbon and low-alloy steel or to martensitic stainless steels by thermal processes such as welding, silver brazing, or spray metallizing systems are acceptable for...
Hi, I'm Xeros
I have two cyclones for separating solid and liauid in Amine Generation Plant.
Our client requested DSS casting (CD4m-Cu) for cyclone body.
However, vendor wanted to apply DSS plate instead of casting for cyclone body.
I think that Erosion is a main factor for selecting cyclone...
Hi,
SS type 316 contact with chloride could experience Chloride Stress Corrosion Cracking and I know that CSCC is embrittlement cracking.
therefore, SS type 316 is susceptible for CSCC.
However, I think that valve trim is forged material and forged material is not susceptible for...
Hi,
Someone told me, "High strength bolting (>150,000 psi [1100 MPa] ultimate tensile strength) shall not be hot-dip galvanized, but shall be coated by mechanical galvanizing or with an inorganic zinc rich primer"
However, I have no idea about this reason.
and more,
I thought that B7 bolting...
Hi,
Generally, I applied B8 (SS304) bolting for duplex stainless steel flange bolting. I think that this has no problem.
However,
I think that B8 bolting is not suitable if the bolting is in the environment that Chloride Stress Corrosion Cracking could occur.
Someone recommended to use B7...
Hi, I'm Xeros.
I heard that Stainless Steel shall be used on Demineralized water service because it is severe corrosive for carbon steel.
I want to know why Demineralized water is severe corrosive for carbon steel.
and i heard that the reason is that Demineralized water is very active with...
Hi,
I'm Xeros.
each material has specific creep temperature.
So, my client request the creep temperature for Cr-Mo steel and 25Cr-35Ni steel.
I could find web site for provide the creep temperature for material.
However, i think that data on web-site is not enough for reference to client...
Hi,
I have to install internal coating for crude oil vessel including salt water.
It operating temperature is about 300 degree C.
However, most of the intenral coating material that I found has a 120 degree C temperature limit. It is difficult for finding appropriate internal coating...
Hi,
I'm Xeros.
In accordance with para. 5.1.2.2.3.e on API RP 571,
"Amine cracking is most often associated with lean amine services. The pure alkanolamine does not cause cracking. Cracking in rich amine services are most often associated with wet H2S problems."
In this sentence,
What is the...
