13 5/8-5000PSI HRSB BOP manual Service
Principles of Well Pressure Sealing
A ram blowout preventer can only effectively kill a well when all the four seals have taken effect.
These four seals include the seal between the ram top seal and the body, the seal between the ram
front seal and the pipe, the body and the front seal, the seal between the body and the bonnet, and
the seal between the ram shaft and the bonnet.
The ram sealing process is divided into two steps. In the first step the hydraulic oil forces the ram
shaft to impel the Front Packer rubber element to make it deformed and seal the front part and it
also lets the Top Seal rubber element be interfered and compressed to fill the gap between the Top
Seal element and the body and seal the top, thus finish the primary sealing. In the second step, with
the help of the pressure inside the well the ram is impelled from behind to allow the further
deformation of the Front Packer element and the ram is also impelled from the bottom to let the
body adhere tightly to the Top Seal element and thus achieve the reliable sealing of the well. This is
called the well pressure assisted sealing effect. Rongsheng Machinery Manufacturing Ltd. of Huabei Oilfield, Hebei
7
4. Structures and Features of the Main Components
4.1
Structural Features
² Such major pressure bearing components as the body, the bonnet and the ram block are cast
formed with alloy steels of high strength and high malleability and properly heat treated. And the water
pressure test for strength is performed before ex factory to ensure it can be used safely under the
working pressure.
² At the bottom of the chamber of the body and the ram there are high brace rods and
sand-depositing slots towards the well bore. So the sands and silts can be removed automatically when
the ram is opened and closed. This can reduce the kinetic frictional resistance of the ram and is also
helpful to the well pressure assisted sealing of the ram.
² A kind of floating ram sealing is adopted to reduce the resistance in opening or closing the ram,
minimize the wearing of the rubber elements and lengthen the service life of the ram. It also prevents the
body and ram from rusting together and thus is easy to dismount.
² The parts inside the house of the hydraulic oil unit are embedded to prevent damages to the oil
circuit during the installation, the transportation and the operation of the unit.
² The top seal of the internal chamber of the body is chemically treated for anticorrosion. The circle
slots for the gaskets on the flanges and the sealing disk hollow butt of the ram shaft of the bonnet are
repair welded with stainless steel and the retainers for the sealing disk hollow butt of the ram shaft are
made of a special kind of stainless steel, which is highly corrosion proof.
² The internal parts and surfaces of the blowout preventer in contact with liquids are resistant to the
corrosive stress of hydrogen disulfide and conform to the requirements specified in NACE MR-0175.
²
The dimensions of the external connections are in conformity with the API 6A norms.
4.2
Pipe Ram
There are two kinds of ram assemblies with two different kinds of structures for the F35-35 ram blowout
preventers. One is integral, the new style HF rams and the other is separated, the old style S rams. Both
kinds of rams can be installed and used on the blowout preventer described in this Operation Manual.
Figure 6 HF Pipe Ram
1
2
3 Rongsheng Machinery Manufacturing Ltd. of Huabei Oilfield, Hebei
8
Table 6 Part List of the HF Ram Assembly
No.
1
2
3
Name
Ram Assembly
Top Seal
Front Packer
Ram Block
Quantity
Ram Specification
1
1
1
C.S.O.
FZ897.21.01.00
FZ897.21.01.01
RJ11148.09.01.02
FZ897.21.01.03
2 3/8"
FZ897.21.02.00
FZ897.21.01.01
RJ11148.09.08.02
FZ897.21.02.03
2 7/8"
FZ897.21.03.00
FZ897.21.01.01
RJ11148.09.02.02
FZ897.21.03.03
3 1/2"
FZ897.21.04.00
FZ897.21.01.01
RJ11148.09.03.02
FZ897.21.04.03
3 1/2", double bore
FZ897.21.10.00
FZ897.21.01.01
RJ11148.09.16.02
FZ897.21.10.03
4 1/2"
FZ897.21.05.00
FZ897.21.01.01
RJ11148.09.13.02
FZ897.21.05.03
5"
FZ897.21.06.00
FZ897.21.01.01
RJ11148.09.04.02
FZ897.21.06.03
5 1/2"
FZ897.21.07.00
FZ897.21.01.01
RJ11148.09.05.02
FZ897.21.07.03
6 5/8"
FZ897.21.10.00
FZ897.21.01.01
RJ11148.09.11.02
FZ897.21.10.03
7"
FZ897.21.08.00
FZ897.21.01.01
RJ11148.09.06.02
FZ897.21.08.03
9 5/8"
FZ897.21.09.00
FZ897.21.01.01
RJ11148.09.07.02
FZ897.21.09.03
10 3/4"
FZ897.21.13.00
FZ897.21.01.01
RJ11148.09.17.02
FZ897.21.13.03
5"-5 1/2"
FZ897.21.11.00
FZ897.21.01.01
RJ11148.09.14.02
FZ897.21.11.03
2 7/8"-5"
RS11172.16.00
RS11172.16.03
RS11172.16.02
RS11172.16.01
