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  1. mk3223

    Thermowell in refratory

    As a reference, here is one ceramic thermowell application in the refractory lined reactor service. It has ceramic tube inside the refractory lined nozzle, and equipped with N2 purge on the thermocouple as well...
  2. mk3223

    SULFUR PLANT: LOCATION OF VALVE AT OUTLET FROM SEAL LEG

    Supposed that the purpose of the isolation valves are added close to the drum of the liquid sulfur source and to be isolated it from one drum from the other. So, one it can be shutdown one unit w/o impacting to the other unit. IMO, if agreed with O&M, the valve may be installed at a proper...
  3. mk3223

    Line colour code/standard for dimensions, text and equipment on .dwg drawings

    IMO, in the CAD drawings the typical colors of the text and lines are recommended in the software application and used as a default color codes. If required, the users may modify or define other colors for the specific needs.
  4. mk3223

    Non return valve

    The Cv values of the ball valves may be different for the full port type from the reduced port. Yes, the flow resistance of the full open ball valve may be insignificant in the piping system, but the Cv of the full port ball valve is to be smaller than the reduced port valve.
  5. mk3223

    Non return valve

    Typically, you may request the vendor to provide the Cv value of the specific valve on your piping system. Also, an engineering reference for calculating the Cv of the piping and fittings can be found in the Crane technical paper- Flow of Fluids.
  6. mk3223

    Seeking Hypotheses for Issue with DN40 Check Valves

    It should be no issue for the metallic seat & disc valve by using the proper material for the NH3 system. What's the material of the check valves? Why to replace the valve body and bonnet top as the sealing surface of the valve seat damaged?
  7. mk3223

    Corrosion resistant piping

    If not specified in the Client OE, select a proper painting which is suitable for the environment, such as on-shore, off-shore, etc., and consult with the local vendor as needed.
  8. mk3223

    absorber recirculation pum mehanical seal

    Should use proper grease on the o-ring seal as the Manufacturer recommended.
  9. mk3223

    Private Fire Service Main - Offline hydrants

    The number of the hydrants to be in service and/or shutdown may be depended on the required firewater flow as well as the number of the hydrants available in the area. May refer to NFPA 1 or 20 for the additional info. Also, may contact the AHJ for approval or if additional requirements needed.
  10. mk3223

    Corrosion resistant piping

    The anti-corrosion paint may be needed due to the specific environmental or maintenance reasons as OE requests. isn't it?
  11. mk3223

    LP Condensate to Condensate Header Feasibility Check.

    Pavan, In addition to the static head of 15m, do you consider the back pressure of the every branches on the 2" Condensate Header? IMO, it's not realistic that the conditions of the pumped condensate head and the branches of the "traps" are to be the constant values through the whole Condensate...
  12. mk3223

    LP Condensate to Condensate Header Feasibility Check.

    It's incorrect to assume the pressure at the team trap outlet or the condensate return header is zero unless it's open to atmosphere. And, it won't work to connect the pumped condensate line to the steam trap header which may block the steam trap or cause water hammer in the actual operation.
  13. mk3223

    Just thought some would get a kick out of this one... the worst installation I have ever seen!

    It’s an easy job for inspector to just reject it. 🙂
  14. mk3223

    Differential Pressure role in Steam trap selection

    The superheated steam is typically dry without too much condensate. But, the function of the steam trap may be needed to be covered from the cold system startup which may generate a high condensate flow. You may confirm it with the Process Engineer and Operation for the startup process.
  15. mk3223

    Differential Pressure role in Steam trap selection

    Op, Need to clarify with where it’s from.
  16. mk3223

    Differential Pressure role in Steam trap selection

    Refer to the TLV manual link below for the steam trap operation https://www.tlv.com/en-us/products/steam-traps/mechanical/high-pressure#2 Basically, the correct selection of the steam trap is based on the how much DP and the required condensate capacity. See the picture animation for the float...
  17. mk3223

    missing data on U1

    One possible option is to search the “National Board #” on the pressure vessel name plate, and contact the NB Resigtration for any existed info regarding this vessel. It may need some time and effort for it but worked in the past. Good luck.
  18. mk3223

    Steam tracing effectiveness on 40" acid gas line

    1. With no flow, the heat is to conduct inside the pipe through the air slowly along the pipe to reach the temperature as specified. 2. To use multiple steam tracers along the 40” pipe or wrap it around to have the constant surface temperature around. 3. Consider a temperature monitor with the...
  19. mk3223

    Expansion Loop supports type

    It looks that this is just a preliminary piping sketch to show the support nodes along the piping routing. The next step is to have a Piping Engineer to review the piping loop routing design and perform the stress calc for the required anchor or guide at the proper locations.
  20. mk3223

    Requesting Feedback on P&ID Design for a Cold Water Supply System with Duplicated Pumps

    IMO, it looks that someone is playing the “Lego” blocks of four pumps and pipes without any design. To make a real system, here are some additional questions for the thought: - adequate pump spacing for safety operation and maintenance - proper mechanical anchors for pumps - proper electrical...

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