{"id":2485,"date":"2019-04-26T14:53:30","date_gmt":"2019-04-26T12:53:30","guid":{"rendered":"https:\/\/www.vecom-group.com\/en-uk\/?page_id=2485"},"modified":"2019-07-01T11:54:38","modified_gmt":"2019-07-01T09:54:38","slug":"discontinuous-or-continuous-steam-blowing","status":"publish","type":"page","link":"https:\/\/www.vecom-group.com\/en-uk\/on-site-services\/boiler-cleaning\/steam-blowing\/discontinuous-or-continuous-steam-blowing\/","title":{"rendered":"Discontinuous or continuous steam blowing"},"content":{"rendered":"
\n
\n\t

Discontinuous (shock or pop) steam blowing<\/h2>\n

With the discontinuous method, the pressure in the steam generator is increased to a certain maximum whereby the required pressure is reached, after which a temporary blow-out valve is opened quickly (<10 seconds). During this pressure drop, the required K-factor is achieved for a short period of time. Due to the release of the pressure and temperature, the steam generator must be restarted.<\/p>\n

This steam blowing cycle depends on the cleanliness of the system and the required start-up and shutdown of the steam generator. Normally, no more than one cycle can be performed daily to ensure adequate cooling of the system.<\/p>\n<\/div>\n<\/div><\/div><\/div>

\n
\n\t

Continuous steam blowing<\/h2>\n

With continuous steam blowing, no high pressure build-up is required to achieve the K-factor and the K-factor can be achieved for a longer period of time. This makes it possible to calculate the required steam blowing time based on the K-factor and the system properties.<\/p>\n

The continuous steam blowing has several advantages over the discontinuous steam blowing. These advantages are not only limited to the possibility of achieving the K-factor for a longer period of time, but also the system load is within the design parameters and the noise level is limited through water injection to below <90dB.<\/p>\n

Due to its many advantages, the continuous steam blowing method is the preferred method by Vecom.<\/strong><\/p>\n<\/div>\n<\/div><\/div><\/div><\/div>

<\/div><\/div><\/div>
\n
\n\t

Advantages of discontinuous steam blowing<\/h3>\n
    \n
  • Due to the higher pressures in the system there is more thermal expansion;<\/li>\n
  • No gradients to large diameters required from the steam blowing line to the silencer;<\/li>\n
  • No extra process\/drinking water required for water injection system compared to continuous method.<\/li>\n<\/ul>\n<\/div>\n<\/div><\/div>
    \n
    \n\t

    Disadvantages of discontinuous steam blowing<\/h3>\n
      \n
    • The required K factor is achieved for a very short period of time (a few minutes) during the steam blowing cycles;<\/li>\n
    • Greater load on the system due to rapid decrease in pressure and temperature;<\/li>\n
    • Steam blowing is performed outside of the design parameters of the system;<\/li>\n
    • Larger amounts of demineralized water required compared to continuous steam blowing;<\/li>\n
    • Temporary steam blowing piping made of high-alloyed steel with higher pressure stages (PN63 or PN100) required (higher costs compared to continuous method);<\/li>\n
    • Temporary blow-out valve required (higher costs compared to continuous method);<\/li>\n
    • The steam generators must be completely restarted before the following cycles can be started.<\/li>\n<\/ul>\n<\/div>\n<\/div><\/div><\/div>
      \n
      \n\t

      Advantages of continuous steam blowing<\/h3>\n
        \n
      • The required K-factor is achieved for a longer period of time (depending on demineralised water availability) during the steam blowing cycles;<\/li>\n
      • Lower load on the system due to gradual and uniform increase in pressure and temperature;<\/li>\n
      • Steam blowing is performed within the design parameters of the system;<\/li>\n
      • Smaller amounts of demineralised water needed compared to discontinuous steam blowing;<\/li>\n
      • Temporary steam blowing piping can be made of steel with a pressure stage PN16 instead of high-alloyed steel with pressure stages> PN16 (cost-saving compared to discontinuous method);<\/li>\n
      • No temporary blow-out valve required (cost-saving compared to discontinuous method).<\/li>\n<\/ul>\n<\/div>\n<\/div><\/div>
        \n
        \n\t

        Disadvantages of continuous steam blowing<\/h3>\n
          \n
        • Larger and gradients to larger diameters of temporary piping required from the steam blow line to the water injection system;<\/li>\n
        • Extra process\/drinking water required for water injection system compared to discontinuous method.<\/li>\n<\/ul>\n<\/div>\n<\/div><\/div><\/div><\/div><\/div>","protected":false},"excerpt":{"rendered":"

          Discontinuous (shock or pop) steam blowing With the discontinuous method, the pressure in the steam generator is increased to a certain maximum whereby the required pressure is reached, after which a temporary blow-out valve is opened quickly (<10 seconds). During this pressure drop, the required K-factor is achieved for a short period of time. Due […]<\/p>\n","protected":false},"author":3,"featured_media":3794,"parent":2475,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"templates\/service-page.php","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-2485","page","type-page","status-publish","has-post-thumbnail","hentry"],"acf":[],"yoast_head":"\nDiscontinuous or continuous steam blowing - Vecom Group<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.vecom-group.com\/en-uk\/on-site-services\/boiler-cleaning\/steam-blowing\/discontinuous-or-continuous-steam-blowing\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Discontinuous or continuous steam blowing - Vecom Group\" \/>\n<meta property=\"og:description\" content=\"Discontinuous (shock or pop) steam blowing With the discontinuous method, the pressure in the steam generator is increased to a certain maximum whereby the required pressure is reached, after which a temporary blow-out valve is opened quickly (<10 seconds). During this pressure drop, the required K-factor is achieved for a short period of time. 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