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  1. Jay_

    UL 58 TANK DISTINGUISHING

    Dear All, UL 58 mentions the below, "3.1 For the purpose of this standard, the following definitions apply. 3.2 TYPE I TANK – A primary tank wrapped by an exterior steel shell that is in direct contact with the primary tank; where, the exterior shell is wrapped from 300 to 360 degrees of the...
  2. Jay_

    Pinpoint leak point in underground storage steel tank

    Hello All, Hope everyone is in good health, We have an underground steel tank, single layer, that started leaking, I was curious if there is any method to determine the leak location and pin-point it. Are there any sensors? any intuitive method to be used? Thanks,
  3. Jay_

    Cantilevered stair vs masonry wall

    Hello all, As the subject says, i am in one of those situations. There is an existing solid masonry wall that need to support a one floor cantilevered staircase structure. For the fixing of the cantilevered treads structure to the wall i am thinking of two options. Option 1) using chemical...
  4. Jay_

    Curving a Steel Pipe for a Helical Stair - Need Advice from Experienced Fabricators

    Hello all, I hope everyone is doing well. I am currently working on an exciting project that involves curving a straight 355mm outer diameter steel pipe with a thickness of 16mm. The objective is to transform it into a curved pipe that will eventually take the form of a spiral, serving as the...
  5. Jay_

    Rust preventive - common practice methods

    Dear, We are in the process of fabrication diesel storage tanks. Shape is cylindrical, horizontal and above ground. We need to ship these tanks for a period of 1 month to the client. The client is asking us to apply some product on the interior unpainted surface of the tanks to prevent rust...
  6. Jay_

    Elliptical manhole.

    Dear, I hope everyone is well, i am working on the design of elliptical flange for a manhole. Does the rules of Asme div 1, appendix 2 apply? Or should we use another code? Does EN 13445-3 rules apply? Detailing is a hobby,
  7. Jay_

    DEMAG AC 205 80T- MFTR YEAR 1998

    Dear all, good day. We recently god a job to repair a crane telescopic boom. We are looking this above crane specifications but we couldn't find the crane boom steel grade. Can anyone help or direct me to the proper route to follow in order to find this material grade or if anyone know it...
  8. Jay_

    Tank chime sealing - Practical method

    Dear members, Hope everyone been good, Happy new year as well, I was researching for a way to seal the tank chime between the concrete ring and the underside of the tank bottom. Now I have found few ways and few suggestions and suppliers like Belzona and Denso. But i am more interested to know...
  9. Jay_

    Non uniform external pressure

    Dear all, I am looking thoroughly on the topic of a non-uniform external pressure on a buried horizontal storage tank. I can’t find any publication or guidelines to help achieve some kind of sets of equations to calculate the different stresses induced by a non uniform external pressure on a...
  10. Jay_

    Manway design. Clarification.

    Dear all, Can anyone please tell me what kind of manway design is this, it’s a manway welded on a pressure vessel head. Thank you. Detailing is a hobby,
  11. Jay_

    Weldox 700-100% martensite

    I recently got a job in welding weldox 700. Type or joint is square butt weld joint. Thickness to be welded is 6mm. I did some calculation, and based on my inputs, it turns out that I will have a high HV hardness in the HAZ and apparently a 100% volume martensite. This work piece shall work in...
  12. Jay_

    STORAGE TANK-HORIZONTAL

    Dear Members. I'm designing a storage tank to store diesel. Dimensions to be ID 3600mm with a length of 15000mm. Location to be above ground and has flanged flat dish. Is there any other code than UL 142 to design it with. UL 142 seems too conservative. Detailing is a hobby,
  13. Jay_

    Sandwich panels vs Insects.

    Dear All, Hope everyone is well and safe, 2020 has been a crazy year. With that being said, we are working on a project and we need to install polyurethane sandwich panels. The polyurethane foam is typically a perfect environment for insects nesting. Does any one have a solution for such a...
  14. Jay_

    Stainless steel 316L with mirror finish vs Sea air.

    Hello everyone; It has been such a long time without interacting with this forum I hope everyone is healthy and safe. I have a project in hand that requires me to install 4 columns of stainless steel 316L mirror finish to hold up a canopy. The canopy is located 30 ft away from the sea. This...
  15. Jay_

    Twisting a 160x80x3mm Rectangular hollow tube.

    Dear Experts, I rarely post in this forum, but we have a project that consists of twisting the above mentioned hollow tube for a 90 degrees. I have read that people tend to heat the tube, or to put a pipe inside of it to prevent collapsing or even sand and to pressurize it a little and then to...
  16. Jay_

    ASME tubesheet calculation

    Dear All, I'm practicing tubesheet calculation according to ASME UHX, It would help if i can double check my calculation and compare it to a reference. Can anyone please submit a drawing a calculation note? Regards, Detailing is a hobby,
  17. Jay_

    E100 ethanol in S235JR storage tank.

    Hello, We are at the stage of deciding whether to use a stainless steel material or carbon steel material to build our underground horizontal storage tank per EN 12285-1. As per the code, the usage of carbon steel tank is permitted as long as ethanol doesn't contain bromide or chloride, as well...
  18. Jay_

    Dished end diameter before forming.

    Hello all, As a steel fabricator company, we sometimes are required to do all kinds of dished ends (Flanged and dished or dished ends only), and it’s sometimes for tanks or decorations or even for the food industry. The routine is that the customer gives us the outer diameter after forming...
  19. Jay_

    Underground storage tank-ethanol service.

    Hello all, I need a guidance. I am working on a design for an ethanol 99.9% double skin tank to be located underground. The tank should be made of stainless steel 304. The tank shall be designed and constructed and tested according to some European code. I usually design underground tanks...
  20. Jay_

    fabricated 24" flange

    hello all, I am required to design a 24" flange according to ASME sec 8 div 1 appendix 2 under an operating pressure of 16 bars. I am designing it because of the lack of this flange in our markets, especially that it's SS316. Anyways i am going through the code and i realize that there is no...

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