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  1. inammanj123

    Why for SA 387 GR 11, Pvelite is making PWHT mandatory, even thickness less than 16 mm ?

    I am designing exchanger of 1.25Cr (SA-387 Gr 11). As per UCS 56, for P NO. 4 PWHT is not mandatory is thickness is less than 16 mm, but Pvelite is making PVELITE mandatory PWHT even if thickness is 12 mm. Kindly clarify.
  2. inammanj123

    Emergency overfill nozzle in external floating roof possible/advisable

    Hello, I have a 44 m dia water buffer tank. Client is asking for a external floating roof and also an overflow nozzle. Considering seal system, is overflow nozzle advisable. As per C.3.1.1 of API 650 overflow opening can be provided, SO what need to be considered when locating overflow nozzle...
  3. inammanj123

    API 650 TANK UNDERGOING CHANGE OF SERVICE

    Hello, I am working on an API 650 external floating roof, naphta tank, which will be undergoing change of service from Naphta to Crude oil. In this perspective what things I need to do from an engineer contractor point of view. It is in FEL-2(feed) stage. Below is what I think I need to do: 1-...
  4. inammanj123

    compressive stress error due to high temperature( more than 900 deg.F)

    dear All Good evening, I am designing a reactor as per ASME Sec.VIII. As of now I am using div 2. by PVElite. The Design conditions are the following : Design case : 8.1 mpag @ 427 Deg C Regeneration case: 2.1 mpag @ 537.8 Deg C external pressure: F.V @ 427 Deg C Material : SA 387 11 cl.2...
  5. inammanj123

    Replacement of Heat Exchanger channel to higher grade material - Repair/Alteration/New Equipment

    Hi, I have a BEU type exchanger on old asme sec div.1 edition. job is to upgrade exchanger by replace channel bonnet to new 1.25Cr material. This is done because service is hydrogen temperature is high, so chance of HTHA is there. Shell side, tubesheet and tube will remain same. Client is...
  6. inammanj123

    is under bottom connections allowed in api 620 like in annex O of api 650

    Hi, I did not find any reference of under bottom connection API 620. can we include those under bottom connection details as shown in annex O of API 650 ??
  7. inammanj123

    Mnimum Weld toe-to toe distance in API 620

    In API 620, as per clause 5.14.5, minimum weld toe toe distance is 150 mm for all nozzle. In aramco spec 32-samss-006 it give an additional clause to api 620 which says 50 mm distance,should i follow the stringent which is 150 mm? quote 5.14.5 Each opening in the walls of a tank shall be...
  8. inammanj123

    flush type cleanout fitting(door) not allowed in API 620 ?

    Hello, In API 620 there is no reference of flush type Clean out door like in API 650, only reference is flush type clean out nozzles, with a limitation on internal design pressure: it says "5.27.1.2 The design pressure for the gas vapor space of the tank shall not exceed 2 lbf/in.2 gauge."...
  9. inammanj123

    Can i design shop fabricated tank on API 620

    Hi, I have api 620 water tank with 15 psig design pressure and 9.4 m dia. Client is looking for a way to limit site activities. One solution is to reduce the diameter to 6 m . In this case i did not find referece of shop fbricated tank in API 620. My question is can we do API 620 tank in shop...
  10. inammanj123

    possible arrangement for tank outlet nozzle to avoid solid carry over into pump

    Hello, I am working on a API 620 sour water buffer tank for Sauid Aramco. One of the client's comment on tank outlet nozzle which is located on shell lower side, is that they are asking for weir plate or some protruding plate, before out outlet nozzle, to avoid carry over, in to the pump, of...
  11. inammanj123

    NACE MR0175/ISO15156 for base metal required when cladding is there?

    I have a de-ethanizer column, with carbon steel base material and S.S 316L cladding. My question is that even after using clad plate is it mandatory that base material shall meet requirements of NACE MR0175/ISO15156? Regards, Inam
  12. inammanj123

    aluminium dome roof VS C.S dome roof with floating roof in gasoline tank

    I am designing a new tank for Gasoline and MTBE having dia 30.5 meters. For roof design we have two option, 1) external single deck floating roof or 2) internal floating roof For external floating roof i am pretty much confident that single deck floating roof will be my choice, but i am...
  13. inammanj123

    Can one tank be used for gasoline, MTBE, methanol, ethanol and pygas

    I have request from client: There is an external floating roof , 30 m dia. this is to be used for gasoline/MTBE. Now client says can this be used for methanol, ethanol and pygas at same time. As per my understanding for methanol,ethanol and pygas you have to use internal floating roof with...
  14. inammanj123

    What things to check scaffolding loads on tall column

    i have 73 m tall column. Client is putting up scaffolding on one side of column(as shown in the attached picture). Scaffolding company has done some calculation, and gave wind force at the tie in points and overall moment at the base. Client now want to check this thing. Any one having...
  15. inammanj123

    Flotation consideration in API tanks

    in API 650 data sheet there is a requirement called " flotation consideration". When do we have consider ithis in tank design. As per the explaination given in annex-L, this is related to when the dike wall is flooded. Kindly elaborate on this. Regards, Manj
  16. inammanj123

    base plate template requirement for skirt supported vessel

    Hi, for pressure on skirt support, this is a general practice that vessel manufacturer prepared a template(jig plate for anchor bolt installation. My question is this a mandatory requirement or a good engineering practice. I mean if we do not mention in data sheet or engineering spec, still the...
  17. inammanj123

    when to do PWHT for cladded vessel

    If a vessel is under PWHT and there is a S.S cladded plate also. How cladded is done? i mean after rolling of plate by vessel manufactuured or the mill will send the cladded plate? PWHT for whole equipment will be after cladding or before cladding is applied?
  18. inammanj123

    Limitations of replacing C.S tube with S.S tubes in a C.S shell and tube exchanger

    Hi, My client want has a to replace existing carbon steel tubes in a shell and tube heat exchanger with stainless steel tubes. Can this be done? what will be the limitations? Does TEMA and API 660 addresses this dissimilar material situation and what what guidelines are there in these standards?
  19. inammanj123

    IS IT ALWAYS MANDATORY TO APPLY NOZZLE LOAD ON STANDARD FLANGE AS PER LATEST ASME?

    In the light of latest ASME, Is it mandatory to check standard flanges against nozzle load. In this way most of the time flange rating will increase and every time we have to inform piping department to increase flange rating. IF A DATA SHEET DOES NOT SAY TO CHECK APPLY LOAD ON FLANGE, EVEN...
  20. inammanj123

    table 2.5.2 which facing sketch and column represent a typical male-female girth flange

    i am designing girth flange for heat exchanger in pvelite. Girth flange face is female and tube sheet face is male type. My question is which facing sketch and column should I select to represent my male-female type girth flange configuration?

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