A brief illustrated description is given of the ITAD ("internal tank access device", also known as "Tadpole"), an aerial access platform for use in the internal inspection and maintenance of tanks in VLCCs and other tankers. It has been developed by Simon Engineering, working in conjunction with Lisnave, where the first operational ITAD is in use. The Mk III version described has a steel pole suspended, from a deck-mounted derrick, through a hatch. The pole carries two carriages, operated by air winch, that can travel up and down, and each of these has a hydraulically-operated adjustable boom which carriers a working platform capable of accommodating up to four men and their equipment. Several safety devices are incorporated. Maximum outreach from the pole (boom horizontal) is 7.9 m. The unit dimantles into parts which can be lowered by winch through a 31-cm cleaning hatch. Maximum pole length is 33 m; pole sections are available in 3-m, 6-m, and 12-m lengths; a dock crane is required to lower the heavier pole sections. Two further units, incorporating pole rotation, are scheduled for early delivery to Lisnave. Order from BSRA as No. 49,839.

  • Corporate Authors:

    MW Publishers

    290A Hale Lane
    Edgware, Middlesex HA8 8NP,   England 
  • Publication Date: 1978-10

Media Info

  • Pagination: p. 19
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00189178
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: Apr 25 1979 12:00AM