Results 1 to 2 of 2

Thread: Atex Certification

  1. #1
    matteo artioli Guest

    Question Atex Certification

    Good morning at all of you,
    my name is Matteo Artioli, and I'm working for a company which manufact screw conveyor, filter, bin activator etc...
    We trying to do the autocertification about class 3, zone 22 according to ATEX 94/9/EC for our machines.
    In order to know how the P.red is, we are thinking to perform finite elements calculation, but our doubt is if in these calculations we have to consider static or dinamic load. Infact reading on the norms VDI 3673 and NFPA 68/69 it seem that for all strength calculation (for example in the sizing of vent pannel) static load has to be considered, but during an explosion the pressure changes in the time with a specific curve.
    If someone knows how to perform this FEM calculations (static or dinamic) and also who are able to do this (university/company etc), please contact me.

    Best Regard
    Matteo Artioli.

  2. #2
    Peter Brown Guest
    To protect equipment by venting requires establishing either :-

    1) the required vent area according to enclosure volume, Kst for the dust, Pstat (the static pressure at which the vent operates), Pred (the allowable static pressure for the enclosure).

    or
    2) the required Pred (the allowable static pressure for the enclosure) according to enclosure volume, Kst for the dust, Pstat (the static pressure at which the vent operates), and the vent area that can be accomodated.

    Most often (1) above is used, but sometimes where space to fit vents is limited it's necessary to to use (2), working back from the vent area to get the vessel strength.

    In either case the values of Pstat and Pred have been under STATIC conditions. There is a draft European Standard prEN 14491 on "Dust Explosion Venting" but I don't know if this will change how Pstat and Pred are used.

Similar Threads

  1. Machinery Directive v. ATEX
    By Peter Brown in forum Fire & Explosion Protection, ATEX
    Replies: 9
    Last Post: 6th April 2006, 6:52
  2. Explosion Protection Now ATEX-approved
    By boursr in forum New Products, New Orders
    Replies: 0
    Last Post: 16th June 2003, 20:43
  3. DOL Capacitive Sensors Now ATEX Approved
    By Author in forum New Products, New Orders
    Replies: 0
    Last Post: 12th June 2003, 13:40
  4. CE Marking and the ATEX Directive
    By Author in forum Exhibitions, Conferences, Seminars, Courses
    Replies: 0
    Last Post: 14th October 2002, 17:20
  5. Atex 100a Directive
    By boursr in forum Fire & Explosion Protection, ATEX
    Replies: 3
    Last Post: 29th January 2002, 17:54

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Single Sign On provided by vBSSO