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  1. EdClymer

    Wind code DIN 1055 part 4

    Greetings I am working to a German code DVS 2205-2 dated 1997 (still very popular in UK). Title: “design of vertical, cylindrical non-pressurised tank” - wholly in Polypropylene This code specifies DIN 1055-4 for wind loads. Does anyone know if this code (DIN 1055-4) is gust based or mean...
  2. EdClymer

    Things you love/hate with mathcad

    Weikequ I used MathCAD in its ‘6’ and ‘8’ format and in 2000 purchased MathCAD 2000 (on CD) together with Smart sketch and Roark and Young. All in 32 bit OS. It was expensive; but over the years it has paid for it’s self many times over. I have never known it give a wrong answer. I like the...
  3. EdClymer

    PTFE

    MEngineer You are unlikely to find any data on Modulus (any) or Poisson's ratio outside of the manufacturers testing lab. If you ask them nicely; they usually provide. Regards Ed
  4. EdClymer

    Silo design. Eurocode 1991-4 interpretation

    Nivoo boss Seems you are down the ‘rabbit hole’ which is Eurocode and the German love of meaningless subscripts. I can offer no advice, other than take it one line at a time and keep asking your self “but what does it mean…”. Repeat. Repeat. I once spent three months on EN 1312- part 3. And...
  5. EdClymer

    Help with coordinate sytem

    Greetings My thanks to all who contributed to my request for help, with special thanks to ThomasH who confirmed (aided by AI) that such a direction system of R, S & T existed and it obeys the Cartesian RH rule. I just could not envisage an alternative to Cartesian (or why);particularly as...
  6. EdClymer

    Help with coordinate sytem

    Greetings My thanks for kind replies. NRP 99. I purchased a CD containing the programme in 2000: by 2002 the supplier had gone bust. They only communicated in Spanish. It is a very good FEA, it always passes validation. There is no way to change orientation system. Geometry is in Cartesian...
  7. EdClymer

    Help with coordinate sytem

    Greetings I have used since 2000; an excellent FEA package called AutoFEA (by JL Analyzer). (It has earned much more than it cost). When I draw a model, I use standard Cartesian – x, y & z. When (after processing) I look for bending stress (between two nodes) I am offered ‘S’ and ‘T’...
  8. EdClymer

    Sodium Hypo Tank Degradation

    Rauri What time scale for blistering? How long tank in service? Temperatures and concentrations.. As described ie PVC-U lined GRP/FRP external - a dual laminate tank. Chlorine from brine and electrolysis is bubbled into sodium hydroxide to produce sodium hypochlorite. PVC-U blisters are...
  9. EdClymer

    FRP tank Bracket support

    Sathya R Not much information in your question. For FRP (or GRP in Europe) implying a glass and resin structure the design codes are BS4994 and ASME RTP-1. As an alternative (not helpful) try EN13121. What was the tank originally designed to? Brackets can be designed by FEA based on data...
  10. EdClymer

    Design of Thermoplastic and FRP Tanks

    Greetings from England Some thermoplastics have superb chemical resistance and are often first material choice for liquid chemical storage. For an example, in UK, for well over 25 years, many hundreds of bulk ferric chloride storage tanks have been fabricated using a Polypropylene liner with...
  11. EdClymer

    FRP crack propagation rates / activity

    YoungPlantEngh The 'paint' is not paint.It is a thixotropic coat comprising of laminating resin plus a viscosity enhancing gell (aka pre gell). Purpose is to seal the laminate from external environmental attack and improve visual appearance. Backing rings of metal (suitably protected) are...
  12. EdClymer

    FRP crack propagation rates / activity

    YungPlantEng, I have looked carefully at your photograph. Under high magnification, a GRP(FRP) (probably polyester/glass)laminate can be seen below the very thick layer of flow-coat. In a physical battle between GRP and steel - steel will always win - (much) stronger, harder, tougher...
  13. EdClymer

    Plastic Tank storage in winter

    Cames Plastics tanks come in many forms. Appears you have selected a 27 m3, two piece roto moulded high density polyethylene (HDPE). Plastics are good insulators (PE first practical use was superb electrical insulation (on early radar) 1941). Air-gaps are also very good insulators. Double...
  14. EdClymer

    Ceiling for numbers with unit

    rmix22 I have checked the manual; and it says ceil (lower case) and it does work in that format. MathCAD 200 does have ceil and floor as built in functions. I hope this time the file is attached. Regards Ed Ed Clymer Resinfab & Associates England
  15. EdClymer

    Ceiling for numbers with unit

    Hoshang My MathCAD 2000 (best ever version) came on a disc and with a 700 page printed manual. It (the manual)says; floor(x) Greatest integer <= x (x real) ceil (x) same It does work.. However, see attachment for use with units. Pleased to be of help Regards Ed Ed Clymer Resinfab &...
  16. EdClymer

    Ceiling for numbers with unit

    Hoshang There is a way (floor also): I shall look it up (have to find correct sheets) and I will advise. Regards Ed Ed Clymer Resinfab & Associates England
  17. EdClymer

    A query on EN 13121-3 about conocal ends (European code for FRP tanks and vessels)

    John Your reply regarding stress to gasket is zero, simply can not be true. There has to be a value otherwise leakage. BS4994 suggests (and has always worked for me) at 2.32 MPa (N/mm2) For many years we have used EPDM gaskets because they tend to be softer than the thermoplastic face of the...
  18. EdClymer

    A query on EN 13121-3 about conocal ends (European code for FRP tanks and vessels)

    John I have just checked and am quite astonished that the PDF was transmitted and available for all to see. (I have rather low expectations of technology) Hope you enjoy all the editing and deleting you will now have to do (I am glad to see back of (square root (A5) ) etc. Regards Ed Ed...
  19. EdClymer

    A query on EN 13121-3 about conocal ends (European code for FRP tanks and vessels)

    John I have found the eleven pages. My understanding is this was a list of complaints, errors, changes and mistooks on 2016 version of part 3. It is a PDF document and I will attach. (I have attached, what happens next is unknown - but I do hope it works. Regards Ed Ed Clymer Resinfab &...
  20. EdClymer

    A query on EN 13121-3 about conocal ends (European code for FRP tanks and vessels)

    John The 'K' in 4994 is not the same as the 'K' in part 3. The whole methodology is different but it is good to compare the two systems - just in case another (as yet unnoticed) error has been found. I helped write 4994 (87) and are therefore biased. The EU wanted a new/different code that...

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