Hercules Deadline Anchor
15 May 2012
We are currently doing a 5 year inspection and need to MPI the hold down bolts for the deadman and also pull the bearing but don't have a maintenance manual for our deadman, does anyone have a manual for a Hercules Deadline Anchor 130-T-SG that shows torque for tie down bolts and removal procedure for bearing???
SAFETY ALERT. DEAD LINE ANCHORS 28.12.1988
DURING A RECENT FISHING JOB ON ONE OF OUR CONTRACTORS RIGS
THE WORKSTRING PARTED DOWNHOLE WHILST BEING OVERPULLED. THE
WORKSTRING JUMPED IN THE ELEVATORS RESULTING IN A SUDDEN LOSS
OF HOOKLOAD AND CORRESPONDING RELEASE OF TENSION IN THE
DRILLING LINE. THIS RELEASE OF TENSION RESULTED IN THE DRILLING
LINE BECOMING WHIPLASHED OVER THE SIDE FLANGE OF THE DEAD
LINE ANCHOR WEIGHT INDICATOR DRUM. WHEN THE STRING WEIGHT CAME
BACK ON THE HOOK THE WIRE PARTED AT THE POINT WHERE IT PASSED
OVER THE BOTTOM OF THE SIDE FLANGE OF THE DEADLINE ANCHOR.
RESULTING DAMAGE WAS MINOR DUE TO THE DESCENT OF THE
TRAVELLING BLOCK HAVING BEEN RETARDED BY THE FREE END OF THE
DEADLINE WRAPPING ITSELF AROUND A STAND OF DRILL PIPE IN THE
AS INSTRUCTIONS HAD BEEN FOLLOWED AND THE RIG FLOOR CLEARED
OF ALL PERSONS EXCEPT THE DRILLER PRIOR TO COMMENCING TO WORK
THE STRING NOBODY WAS INJURED IN THIS INCIDENT.
THE MODEL OF ANCHOR WEIGHT INDICATOR IN USE WAS A MARTIN DECKER
HERCULES HA 118T. AS SUPPLIED BY THE MANUFACTURER THIS MODEL
HAS ONLY TWO JUMPER BARS FITTED OVER THE LINE ON THE DEADLINE
DRUM AT POSITIONS OF ZERO AND 180 DEGREES WRT VERTICAL. THE
CONTRACTOR HAD INSTALLED A THIRD JUMPER BAR AT THE 90 DEGREES
POSITION ON THE SIDE WHERE THE DEADLINE RISES TO THE CROWN
BLOCK AS A RESULT OF A SIMILAR INCIDENT ELSEWHERE 2 YEARS AGO.
IN THIS INCIDENT THE DEALINE JUMPED OVER THE FLANGE ON THAT
PART OF THE DRUM HAVING NO JUMPER BAR INTERMEDIATE BETWEEN
THE ZERO AND 180 DEGREES POSITIONS.
THE DEADLINE ANCHOR DRUM WAS SUBSEQUENTLY MODIFIED BY THE
INSTALLATION OF TWO JUMPER BARS AT 60 DEGREE INTERVALS IN THE
180 DEGREE SECTION. AN IMMEDIATE ALERT WAS SENT TO ALL RIGS
TO CHECK IF THEIR DEADLINE ANCHORS HAD SECTIONS UNPROTECTED
BY JUMPER BARS OF MORE THAN 100 DEGREES MAXIMUM.
Deadline anchors are bolted to a base in such a way that the bolts
are always in tension. The deadline anchor is often situated in a wet
(corrosive) and out of the way place, and is prone to be neglected.
The anchoring bolts need to be checked regularly for corrosion and
for proper make up
Maersk Oil & Gas dealt with the same issue long time ago. As they have optimum record keeping they may still have the reports. I would try Esbjerg, first. (my "diary" ... 10.03.1989 Friday 1989 Wk10 Vrijdag: Hercules anchors f/ PFV wire rope (M). )
From afar, I have seen Vetco associated with Hercules (1985 Fred Hettinger Joe Glassmer/Gladssner)... I wonder if it is the dead line anchor business.
Consultant ( sort of retired but keeping in touch )
Try Forum Technologies at
26 Soon Lee Rd.
Singapore 628 086