Access
& Retrieval System
RETRIEVABLE (HIGH PRESSURE) SYSTEM
The Caproco
High Pressure Retrievable system provides access to a process system under
full operating conditions. It is capable of operating at pressures up
to 6,000 psi (0- 41.4 MPa). This system eliminates the need to interfere
with normal operations to obtain vital corrosion data. Key system components
are:
1.
Access Fitting 2.Solid/Hollow Plug 3. Retriever
4. Service Valve
Basic
Principle
Access is gained to the process system by attaching a Caproco Access Fitting.
Various connection options (welded, NPT thread, flanged) are available.
Once the fitting is attached and a hole is drilled through the pipe/vessel
wall using the Caproco drilling machine, a plug is inserted into the fitting
to seal the system. Attached to the plug can be a variety of corrosion
monitoring equipment, such as: coupon holders, electronic probes or injection
equipment. The monitoring device can be removed for servicing or replacement
at any time with the use of a Caproco Service Valve and Retriever. To
access the monitoring device without process interruption, a service valve
and retriever are attached to the access fitting. Once pressure equalization
between the line and the service valve/retriever has been achieved, the
retriever is used to withdraw the plug and monitoring equipment past the
valve, which is then closed to maintain line pressure. The pressure in
the retriever is released, allowing it to be removed from the service
valve, and the plug and monitoring equipment can be detached to complete
the respective servicing.
Access
Fittings
Access Fittings can be divided into two categories: Tee
and Non-Tee. The more commonly used non-tee style fittings typically hold
monitoring equipment such as corrosion coupons and probes.

Sample of Caproco Non-Tee Style Fittings
Standard
access fitting bodies are manufactured from hot rolled stock or forged
bar; flanged fittings are machined from long weldneck forgings. All Caproco
access fittings conform to NACE MR-01-75 Sour Service Specification. Various
designs are available to cover a wide variety of monitoring applications.
Access
Fitting Process Connection Options: |
|
|
-
2" Flare Weld
- 2"
Butt Weld
- 2"
Socket Weld
- NPT
Thread
- 1"-3"
Flanged
|
 |
Caproco
tee style fittings are designed to enable a product to be injected into
a system continuously or intermittently. They also enable the operator
to draw a fluid sample from the system. The tee on the access fitting
(with NPT threaded, socketweld or welded flanged connections) allows a
nipple and shut off valve to be attached. Welded side-tee connections
are welded using approved procedures and are stress relieved and inspected
according to relevant prevailing codes.
Caproco tee access fittings are available in flareweld, buttweld, socketweld,
flanged and other styles of line connections, to suit customer requirements.

Sample of Caproco Tee Style Fittings
If desired,
tee style access fittings can be used to hold corrosion coupons or probes.
The tee on the access fitting body may be sealed off (with a pipe plug
or shutoff valve) and the corrosion monitoring equipment mounted on a
hollow or solid plug. If a pipe plug is attached to the tee, the tee outlet
cannot be used again until the system has been shut down or isolated.
The height
of the access fitting body is increased to accommodate the tee. This additional
height should be taken into account when calculating the length of the
injection / sampling tube or insert.
Standard
Caproco access fittings are manufactured to meet most service requirements,
however changes in metallurgy will be made on customer request to meet
specific service requirements.
Examples
of frequently used materials: |
|
- Stainless
Steel
- Duplex
TM
- Incoloy
TM
- Inconel
TM
|
To view the
technical catalog sheets on High Pressure Access Fittings,
Non Tee (Click
here)
Tee
(Click
here)
For more information
on optional materials / design requirements (Click
here)
|