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Thank you for replaying, I actually concern about the micro-structure issues such as double hardening. So if you have any reference about this topic that you can mention it to me?

Can someone mention the main issues when we make welding over exiting weld for low alloy steel?

I intend to take (Non-Destructive Testing) NDT certification Lv. 3 (particularly in Radiography Testing (RT) , according to ISO standard so any help will be appreciated such as Study Guide for preparing for Examination

Can I use valve lined with Tetrafluoroethylene polymer (Teflon PTFE) and the service is Caustic soda in the following operating conditions: - Max. temperature: 120 C - PH: 14 - Flow: 2 m3/h6 - Specific gravity: 1.1174 - Free sodium hydroxide: 162.5 Kg/h - Sulphate: 33.7 Kg/h - Water: 1955.2 Kg/h

My question is that according which standard I can choose the valve flange facing (Raised Face (RF), Full Face (FF), Ring Joint (RTJ), Male and Female (M&F) or Tongue & Groove ). Noting that I have the values of operation temperature and pressure. Thanks

thank you for your response, can you mention the reference for such calculations?

I have water tube boiler and I need to ask about the max. number of tubes in bank tubes (boiler side) can be plugged (due to leakage which difficult to be replaced) that do not cause fail or limit in steam production.

What is the effect of exposure to high temperature on stainless steel TP 321H, I have checked the hardness after heating and found it is 250 HB higher than the standard value and the surface color turns to blue? I have found that many resources called this phenomenon as "Heat tint"?

Is that possible to replace the return bends in a furnace that is worked in Vacuum unit by headers did API 560 permits this replacement?

What is the effect of using fuel oil instead of fuel gas on carbon steel pipes in boilers and furnaces? and how can I eliminate the bad effect of fuel oil?

what is the reason behind the occurrence of pitting corrosion on the outside surface of tubes (material 5% Cr) for heat exchanger that connected to bottom of naphtha stabilizer column in crude distillation unite?

What is the proper coating that I can use for carbon steel drum contain water and the pH range (3.5 to 7) as this drum is corroded severely in these conditions? noting that the water is added to water before it enters the drum since this drum is part of dissolved air floatation systems water...

We have 321 stainless steel radiation tubes of furnace that filled with stagnate boiler feed water (doesn't contain chloride)during the maintenance and welding work due to safety precautions. Can this water have harmful effect on this material under such conditions and period of time?

AS you mentioned the plug, the drain is plugged with hydrocarbons how this can cause such failure?

Thank you for replaying, but can the difference in mechanical properties between filler metal and base metal cause such failure?

low alloy steel flange (2.25% Cr) was welded to carbon steel pipe (ASTM A106) by mistake and the welding was done by E7018 electrode. after that, we have noticed a longtudinal crack in HAZ of flange (low alloy side). I know the hydrogen with martensite microstructure of low alloy steel after...

What is the reason that can cause the failure of drine connected to chiller and made of steel resists low temperature condition? where the failure was a longtudinal crack.

Hi guys, I want help with princeton applied research 273a instrument, since I have not use it before and I attend to run LPR and Tafel measurements.

I fabricated nanowires and after complete dissolving of template, I need to obtain the dried nanowires. Can anyone help me to achieve this process?

If we qualified a welder with thickness with test coupon of 10 mm or 14mm , then is there a range of accepted thickness (max & min.) for each case with GTAW or SMAW process.