The Guardian Series Hydraulic Blowout Preventer has been specifically
designed for workover rigs. It can be used with 6” 600, 6” 900 and 6”
1500 series equipment and well heads. (Rated for working pressures of
2,000 psi, 3,000 psi, and 5,000 psi, respectively). In addition to
testing and inspection, the high-quality, cast preventer body is
structurally analyzed using the finite element method. The Guardian BOP
NACE and API requirements for internal sour gas service.
This is an overall rugged, compact blowout preventer featuring a unique
sliding door which provides quick and easy ram change without the use of
bolts. Rams are accessed by simply pulling a lock pin and cranking a
rack and pinion. All hydraulic passages are internal in the preventer
body and cylinder end plate. Connecting tubes between end plates and
body are rugged and well protected. The piston rods are colmonoy coated
to provide dependable and corrosion resistant service.
NOTE: Type T and G are the only BOPs currently
offered by Weatherford
Guiberson’s compact blowout preventers are
specifically designed for well servicing, workover, and light drilling.
They seal tight against well pressure up to 3,000 psi and close and open
easily and positively with either manual or hydraulic control. The ram
assemblies in Guiberson preventers assure a positive, complete seal. The
rams are designed to position the pipe at the
center of the unit. The non-rising ram feed screws in
Guiberson preventers are hollow for full pressure equalization. This
important feature assures that preventers operate easily and positively,
even under peak pressure. The heavy Acme threads on these screws feed
smoothly and will not foul with residues or junk.
CAUTION: Do not open BOP under pressure!
Quick Change Packing Rubber
Guiberson preventer rams can be changed quickly and easily, even while
the pipe is in the hole. Only six nuts are unscrewed to remove either
end plate. With end plates removed, both ram assemblies are accessible.
The new packing rubber then slips easily into the ram assembly. No tools
are required to install the new rubber. The packing rubber is
strengthened by a molded-in plate.
Guiberson preventers are fabricated for high burst resistance of tough,
heat-treated cast steel and are compact and easy to handle. Because the
flange bosses are cast integrally with the preventer body, the extra
space and weight of separate flange necks is eliminated. With this
compact design, each Guiberson preventer stands only 11-1/2” high. Four
cast-in lifting hooks on the body make lifting and moving easy.
Flexible, Economical Duals
Only Guiberson preventers provide the added safety of a double unit
without the extra cost of integral double units or the waste of space
caused by inter-connecting spools. The patented tie bolt system in these
preventers allows them to be stacked directly, either parallel or at
right angles to each other. This design gives the operator maximum
flexibility in positioning the units for most convenient operation and
most efficient use of space. Only four tie bolts are needed to stack the
preventers. These tie bolts fit flush with the top and bottom of the
housing, eliminating interference with wing valves and other equipment.
Stacked Guiberson preventers provide the ultimate in compactness. Two
units stacked and ready for service are less than 24 inches high.
Guiberson’s hydraulically operated blowout preventer combines all the
features of the mechanical with virtually instantaneous hydraulic
operation. With 2,000 psi hydraulic pressure, it closes in less than 2
seconds. Available with dual controls for both rig floor or remote
operation, it can be operated from the rigs hydraulic system or, using a
separate pump-accumulator system, from separate pneumatic, electric,
gas, or diesel powered equipment. Hydraulic preventers are supplied with
supplementary manual controls which allow the rams to be locked
positively, once closed, and provide an alternate closing mechanism for
Hydraulic Conversion Units
By simply removing nuts at each end to exchange the end plates, any
Guiberson preventer may be converted to hydraulic operation. Ram
assemblies are not changed when converting from manual to hydraulic