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My Client intend to have Production Weld Hardness test for our "NACE" categorize material. We are in a Gas Plant processing (AGRU & SRU). In NACE MR0175. The weld deposite value for WPS/PQR is 250 HV. However HV can not be used for production weld, since it needs to be destructive test. While...

Dear All, We are undergoing an Gas Plant Sweetening project. My Client is installing an Air Fin Cooler on the Wellheads, before entering the pipeline. The initial use was to reduce the temperature because he said it was too hot for any underground wrapping. Because he already installed the Air...

Dear All, I am facing an upstream oil&gas processing facilites project which the client tries to reduce a lot of cost. One of the is "cladding valve". They specify cladding valves such as: - Body Carbon steel with Incoloy/inconel cladded, for gate/globe/check/ball type valves - The ball of...

Dear All, What is the best design for a pigged trunnion Full bore ball valve design. The valve is attached to the pig launcher and pig receiver (to isolate between the pig and the pipeline) 1. Soft seat vs metal seat? 2. Single piston effect vs double piston effect? 3. Any other special design...

Currently we are designing a floating roof tank with the diameter of 80m and height of 20m. Due to the unfeasible source of fresh water, our client premitted us to do hydrotest by using seawater. Since we are not familiar (experienced) with hydrotesting using seawater. We are still in searching...

Dear All, I come across the requirement for soft seat valves (ie Ball, Butterfly etc). Some requirement mention "Fire Safe Design" and some mention "Fire Tested Design". I am getting confused. If those terms are same or not. In my humble understanding that "Fire Tested Design" shall be...

We are currently handling a project for CNG that are cooled down until minus 30 deg C. The valves would use LTCS material. We would like to have suggestion regarding the bonnet type. Is minus 30 deg C, can use normal bonnet or shall use extended bonnet? I am thinking of using extended bonnet...

We are an EPC Contractor and it's our first time to design a CNG plant. We are currently having an intense discussion with my fellows about the requirement of Flare system for a CNG plant. As many of the CNG facilities (mother and daugther station) existed, do not use flare system. And our...

Hi All, Can anybody help explain why in the latest ASME B31.3 edition 2010. They delete Notes (7) in appendix A, which previously limits the temperature of the material? Does it mean that after this deletion, we can use the material abouve the previously restricted temperature? As long we...

Currently I am looking towards a FEED for refrigerant CNG. The idea to cool down the CNG was to obtain the "optimum compression storage" between pressure and temperature. My question is that on the material spec for class rating 150# and 300# they used SS 304L. But after compression, the rating...

Does anybody have a reference of any code, standard, recomended practice etc? To design a CNG mother station safely. I confused in designing the plot plan, whether the spacing of equipments is ok, too narrow or too wide. Thank you

Dear All, I would like to know the mechanism how Cement Linning protect Carbon Steel from seawater corrosion. As I know, cement should have porosity. And through year the chloride content in the porosity will rise up, accelarating the corrosion? So what would be the estimated deign life time of...

Dear All, My process department requires an Automatic Vent valve for a flammable liquid line. I search through the internet, but I couldn't find any that type of valve that are suitable for this application. Do anybody have any information which manufacturer that produce this type of valve...

Hi all, Does anyone have experience in designing fire safety requirement for Compressed Natural Gas plant? If yes. Which code to refer? Its my client first time to design the CNG plant. And we are all confused what is the best fire protection for the CNG compressor and CNG Tube. Since the...

Hi all, Does anyone have experience in designing fire safety requirement for Compressed Natural Gas plant? If yes. Which code to refer? Its my client first time to design the CNG plant. And we are all confused what is the best fire protection for the CNG compressor and CNG Tube. Since the...

For sour gas plant, which material is preferable, Inconel 625 or Incoloy 825? Some project specify Inconel, and other specify Incoloy Anybody can advise what are their advantage and limitation? Which material to be used in what condition? Also in terms of price and availability, which one is...

On pressure rating class 900#, 1500# and 2500#. When do we use Ring Joint and When do we use Spiralwound? Since most of the oil and gas company prefer Ring Joint gasket for 900# and above. But some also allows spiral wound on 900#. The vendors also proposed SPWD since it would be more cheaper.

Hi all, We ordered valves to the vendor. With painting specification of SP with Primer Inorganic Zinc DFT 75 micron. The problem araise when the vendor did not paint the valve according to good engineering practice. They paint the valve stem also. So the valve becomes hard to operate. Is...

Hi, I am designing a CNG plant. The PSV on the compressor package and CNG tube package will be supplied inside the skid. So the PSV will be lower than the flare header. Is it ok if the PSV is lower than the flare header?

Hi all, I am looking at a Petronas/Shell std for piping class 1500# and 2500#. On small bore pipe, they specify ASTM A106 gradeB. (normal CS pipe, pipe thickness bellow 20 mm) While for large bore pipe, they specify ASTM A333 grade 6 (Low Temp CS pipe, pipe thickness over 20 mm). I am...