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Recent content by CKchi

  1. CKchi

    Steam service PSVs testing on Air Test Stand

    Hi Nasim 123, Typically you should be able to get both CDTP value and Set pressure value from the PSV datasheet/ tag. When you test the PSV on the test bench, you only need to refer to the CDTP value. But if the PSV is not originally designed for your steam service and now you want to use it on...
  2. CKchi

    Chattering of Safety Valve based on oversizing

    In my opinion, First, you have to understand the "effective orifice" and " actual orifice" area. Per API 520, the effective orifice area is used for initially sizing the PSVs, However, many PSVs' certified area are presented in ASME actual orifice area. There are some correlation between API...
  3. CKchi

    Why the pressure Class 900 is not mentioned in API 602

    I am new from the valve industry ,I understand API 602 is standard for steel GGC valves with small sizes. it specifies the pressure designations of Class 150, Class 300, Class 600, Class 800 and Class 1500? i am wondering why the Class 900 is not mentioned? As ocassionaly, i have been asked to...
  4. CKchi

    Vulcanized liner VS rubber liner on butterfly valves

    Thank you gerhardl and Dalnap for your valuable input.
  5. CKchi

    Vulcanized liner VS rubber liner on butterfly valves

    From my knowledge, the rubber liner is replacable and Vulcanized liner is boned to the body by vulcanization. So in most cases i guess rubber liner is preferred as the liner can be replaced for cost saving. My question is what is the main purpose of having these two designs? Generally in what...
  6. CKchi

    ss316 or 410 Ball with PEEK Seat

    Hi quiinces, In my opinion, PEEK material can never cause scratch on SS/F6a ball, it is softer than the steel. PEEK is commonly used as the seat materials for high pressure use.
  7. CKchi

    Differences between seat, seat insert and seat ring.

    HI Jethrolawing, Just take the Trunnion mounted ball valve for example, please see the attachment. item 49 - is the seat insert (for example PTFE) Item 45 - is the seat retainer or seat ring ( for example 316） Hope this helps...
  8. CKchi

    Replacebale seats or Intergral seats

    Recently i faced a case on 3/4 inch forged steel valve (ISO157160 . The client is insisting to have replacebale seat inserts, but our supplied forged globe valve is interal body seats with stellite 6 overlay. Referrign back to ISO15716 Section 5.4.6.1 “Integral body seats are permitted in...
  9. CKchi

    Operating Range of RTFE seats in a Butterfly valves

    RPTFE has a range of operation temperature of -100 degreeC to 200 degreeC, i guess it shoul be ok for the case of 180 degreeC and pressure rating 600#. A double offset butterfly valve with firesafe design, I guess the primary seat is PTFE and secondary seat seal is metal.
  10. CKchi

    Trim material A105 or WCB hardfaced with stellite

    Hi Diegoverly, This reply may be late, i assume you are talking about GGC vavles. AISI 410/STELL - Trim 8; F304- Trim 2, F316- Trim 12. I am working in a Neway, a chinese valve company, i would say it's common to trim in A105 or WCB hardfaced + stellite to prevent galling. For example if...
  11. CKchi

    Valve NDT Test - UT/RT/PT?

    Hi Gerhardl/ Rverman, Thank you. the information is very helpful. BS16.34 does define the applications of surface examination, i will go back and read through it.
  12. CKchi

    Valve NDT Test - UT/RT/PT?

    Hi, I am new in valve industry, i have a lot confusion on the NDT test (UT/RT/PT). In what situation shall we carry out the correct NDT method? I understand my company that: 1. We dont carry RT on forging valves. 2. We dont carry UT on Casting vavles. Can anyone give your opinions? what are...
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