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  • Users: bmoorthy
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  1. bmoorthy

    Corrosion Allowance & Corrosion Rates for various chemicals

    Dear experts, In the mechanical datasheet of equipment, one can see the value for corrosion allowance. When one enquires the mechanical engineer who prepared the datasheet on the basis of providing certain value, reference is made to process datasheet, if you ask the process guys, they refer...
  2. bmoorthy

    Who decides whether a service is a lethal service and what is the basis of such decision.

    Dear experts, I am conversant with the ASME UW 2 requirements and the definitions given therein including the details in various footnotes (general notes, inside ASME Sec VIII Div 1). Mechanical discipline engineers get the information on the service from the process data sheet, which is...
  3. bmoorthy

    Choke Valve:: Tungsten Carbide Tip Broken

    Recently I came across Choke valve Failures. The valves were in service for less than 1 year. In 2 cases the hand wheels were rotating freely, so the valves were opened and it was observed that the Stem tip made of Solid (HIP) Tungsten Carbide had broken. The tungsten carbide was attached to 410...
  4. bmoorthy

    Is Wake Frequency Calculations required to be carried out for Choke Valve Stem?

    Although there is a change in direction of flow in a Choke valve, due to the reduction in pressure Choke, there would be high flow velocity. There is a possibility the stem may get subjected to flow induced vibration, hence is it necessary to conduct Wake Frequency Calculations for Choke Valve...
  5. bmoorthy

    Solid Tungsten Carbide Stem Tip for Choke Valve (Well Head area)

    ISO 15156-3 does not list Tungsten Carbide as one of the qualified material, but it is observed most of the Choke Valve suppliers offer Tungsten carbide Stem Tip (Needle tip) as Solid Tungsten Carbide. It is alomost an industry practice. Also it is understood this Solid Tungsten Carbide is HIP...
  6. bmoorthy

    What is the idea behind Standard test pipe?

    8" Dia x 1/2 " ASTM A 53 is getting welded to another 8'x 1/2" thick ASTM A 56 tubular :: Butt joint (CJP) Refer to table 4.2 of AWS D 1.1 WPS indicates Minimum diameter as 4" and Maximum diameter as unlimited. This WPS is supported by PQR, the PQR is performed on 6" x Sch 120 (14 mm thick)...
  7. bmoorthy

    What is the need for API 20 series

    Understand that API has recently issued API 20A, API 20B, API 20D, API 20E etc The Need for API 20 is not understood. It just lists the material that are already in ASTM and also lists the issues that are already in ASTM For example API 20E is for bolt and nuts for Oil field application. But...
  8. bmoorthy

    Cast versus forged :: From Purely corrosion point of View

    The material that are usually encountered in Oil, Gas and refinery industry, considering only the corrosion aspect, it is my view that casting is a superior product form as compared to forging, I do not know how i arrived at this conclusion, but i hold this idea for very long. I just looked up...
  9. bmoorthy

    What is the threshold for rusting

    2 identical ball valves, all CS body, bonnet, SS 316 Ball, SS 316 Stem, SS 316 Seat ring with soft seat insert, turnion, 718 springs were procured. All from same manufacturer (One of the top world renowned valve manufacturer). 10" 300 Rating, ISO 17292 (Tested to ISO 12266 and ISO 15848-2)...
  10. bmoorthy

    Use of material in Sour service without SSCC test and HIC test?

    As per NACE MR -175-ISO 15156-2 clause A.2.1.3 ASTM A 105, and as per clause A 2.2 and Table 2 which provides examples of items that are permitted to be used without SSCC testing when the items are to be used in sour service. A) Based on the table 2 can one infer that A 694 F 60 and A 694 F 65...
  11. bmoorthy

    What is the diffeence between 77/300 and 77/312

    Context:: Shell MESC Understand that 77/312 is no longer valid and 77/300 is taken over 77/312. Also understand that there are 77/300A and 77/300B also. 1) What are 77/300, 77/300A and 77/300B and how does this differ from 77/312. 2) Suppose one needs to supply Valve in N2 service and some...
  12. bmoorthy

    Design of Safety valve

    The PSV requires ASME U stamp. This PSV is going to be mounted on a pressure vessel (ASME Sec VIII Div 1). PSV Sizing is finished and the ratings are fixed. We know the set pressure of the PSV. A) Should the body thickness for the PSV be arrived from ANSI/ASMEB 16.34 or should it be based on...
  13. bmoorthy

    Thickness of PSV Casting,which standard to use

    The PSV requires ASME U stamp. This PSV is going to be mounted on a pressure vessel (ASME Sec VIII Div 1). PSV Sizing is finished and the ratings are fixed. We know the set pressure of the PSV. A) Should the body thickness for the PSV be arrived from ANSI/ASMEB 16.34 or should it be based on...
  14. bmoorthy

    Stock Inconel Material having Carbide (In Micro Examination)

    Question:: 1) Should micro examination result be used for deciding the acceptance and rejection of Inconel material (From the point of view of Longevity of the end component and from the point of view of safety) when B 564 does not have any reference to Micro examination for 625 items. 2) What...
  15. bmoorthy

    Is the standard USAS B16.30 still used?

    One of my older colleagues in his lecture informed that long time back they made use of B 16.30 for selecting vessel Girt Flanges and that B16.30 was in general use for ASME Sec I items and it used allowable stress of plate SA 285 gr C and that of bar A 306. 1) Is the standard B 16.30 still in...
  16. bmoorthy

    ASME/ANSI B 31.3 ASTM A WPL 6 on Pressure Piping

    While i have asked for a question in Boiler and PV Forum,on the related subject, this question is slightly different from that one, hence in this forum Please refer to the Clause 7.4 from A 420 WPL6 7.4 When the fittings are to be post-weld heat treated after being welded by the purchaser and...
  17. bmoorthy

    SA 420 WPL6 in U stamped Pressure vessel

    In a U stamped Pressure vessel SA 420 WPL6 is to be used. The vessel is required to be postweld heat treated. There are no requirements to follow other that ASME (That is client specification says "All presure vessel shall be designd and fabricated to ASME Sec VIII Div 1 as per desin data...
  18. bmoorthy

    Is this a Mistake?: Stress Relief

    Reference: ASME Part II A SA 193: Clause 6.1.1 Item: Quench and Tempered Fastener, for the purpose of dimensional control has been stress Relieved. Item has been quenched and has been Tempered. Tempering temperature is 655 Deg C Question 1) What shoul be the Stress Relief Temperature...
  19. bmoorthy

    Un painted SS 304 Versus Painted SS 304 Versus Galvanized Low Alloy St

    Conditions: Offshore Marine Humid 50 Dec C Item: Non pressure but in Support/semi loaded (Spring Holder, or Actuator assembly Tie Rods, Fasteners in Instruments)Tie rods, Bolting material (Studs and Nuts) Material under Discussion: 1) SS 304 (Solution Annealed) A 193 B 8, 2) SS 304 Painted...
  20. bmoorthy

    Lethal Dilema

    We are EPC contractors. Our client (USER) provides the process data sheet. This data sheet does not indicate the Service is lethal service. But the data sheet states that the Fluid is Sour and contains 12000 PPM of H2S. Vessel Design pressure is 180 Bars. Design Temperature: 193 Deg C Fluid...

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