Apparatus for servicing a reactor such as tensioning reactor ves

Details Apparatus for servicing a reactor such as tensioning reactor ves Apparatus for servicing a reactor such as tensioning reactor ves

1995-08-21

1998-03-24

Watson, Robert C.

Implements or apparatus for applying pushing or pulling force

Pipe or rod jack

Tie rod tensioner

E21B 1900

Patent

active

057304211

ABSTRACT:
A stud tensioner for tensioning the upright studs which secure the head to a reactor pressure vessel is suspended by a motor operated hoist from a motor operated trolley mounted on a circular rail supported above the studs. A single operator operates the motor operated hoist and motor operated trolley, and manually radially fine aligns the stud tensioner for engagement with a stud through a control handlebar. A pair of side-by-side switches adjacent a first hand grip at one end of the handlebar enable the operator to operate the trolley to move the stud tensioner left or right, while vertically aligned switches adjacent a second hand grip at the other end of the handlebar are used to operate the hoist to raise and lower the stud tensioner. Simultaneously, the operator can radially maneuver the stud tensioner by applying force through the handlebar. An adjustable mount allows the handlebar to be rotated about a horizontal pivot axis and locked into a selected angular position relative to the tensioner.

REFERENCES:
patent: 2072747 (1937-03-01), Freese
patent: 3355040 (1967-11-01), Guttridge
patent: 3421635 (1969-01-01), Bunger
patent: 3851906 (1974-12-01), Frisch et al.
patent: 3933388 (1976-01-01), Conboy
patent: 4047456 (1977-09-01), Scholtz
patent: 4223575 (1980-09-01), Krueger
patent: 4548103 (1985-10-01), Orban
patent: 4552038 (1985-11-01), Helermann et al.
patent: 4675967 (1987-06-01), Okada
patent: 5164151 (1992-11-01), Shah et al.
patent: 5295167 (1994-03-01), Burner

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