Self restrained dismantling joint large stroke type steel PO DN40-2000 - Reinforced version
| The self restrained dismantling joint Type PO for flanged valves allow the installation or removal of an equipment between two fixed flanges of a pipeline. The sliding system can reach a 50 mm displacement to ease the removal of the equipment. For this type of self restrained dismantling joint the locking of the valve to the pipeline is made by the tie bars and the gland. |
Range
The self restrained dismantling joint Type PO exist in a range stretching from DN40 to 2000, for pressure PFA10, PFA16 and PFA25.
Material and coatings
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Item | Description | Material | Coating |
1 | Fixed body | SteelEN 10025 S235JRG2 | Epoxy Coating 300 µ |
2 | Gland | SteelEN 10025 S235JRG2 | |
3 | Sliding body | SteelEN 10025 S235JRG2 | |
4 | Gasket | EPDM rubber | |
5 | Tie bars | Steel EN 10025 S235JRG2 or S335J2G3 grade 4/6 | Hot dipped galvanized 40 µ |
Installation
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Compliance to Standards
For the self restrained dismantling joint PO
These equipments comply with the standard NFE 29220, especially concerning the flanges dimensions according to the EN 1092-1 or 2 and ISO 7005.
The full-flange sliding body: the flange is according to ISO 7005 standard.
The stroke range is higher than those demanded in the NFE 29220.
Assembly and start up
Description
The self-restrained dismantling joint type "PO" allows the installation and removal of valves pieces or flanged pipes. An active adjustment length until ± 25 mm is possible during the assembly.
The transmission of the forces is carried out by the threaded rods on the counter flange.
Transport
The transport of the pieces must be done professionally in order to avoid damages on the material.
Storing
The self-restrained dismantling joint must be protected from bad weather and pollution. During a long storage period a protection against UV is necessary.
Assembling in the pipe network
It is necessary to control that the flanges to be connected are clean and not damaged. The flanges must be installed in parallel and centered.
Assembly
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- To fix the first flange with the flange of the pipe or the valve. The two flanges must be centered and parallel. The flat tightness seals (to be provided by the customer) will also be installed centered.
- The nuts of the first connection are to be tightened (tightening torque according to information given by the supplier of the joint).
- Assembly of the second connection taking into account the necessary mini and maximum length of the dismantling joint (A).
- After the assembly of two connections, it is necessary to push the tightness seal (7) against the external pipe (2).
- Then it is necessary to tighten the nuts with the ring of tightening (3). Once the assembly of the pipe finished and the length of the dismantling joint defined, it is necessary to tighten the nuts in cross.
The dismantling joint is now ready for operation and can receive the axial thrust of the pipe.
| PN10 | PN16 | |||
| DN | Threaded rod | Tightening torque to the tightening ring (±10%) | Threaded rod | Tightening torque to the tightening ring (±10%) |
| mm | Nm | Nm | ||
| 50 | M16 | 42 Nm | M16 | 42 Nm |
| 65 | M16 | 42 Nm | M16 | 42 Nm |
| 80 | M16 | 42 Nm | M16 | 42 Nm |
| 100 | M16 | 42 Nm | M16 | 42 Nm |
| 125 | M16 | 42 Nm | M16 | 42 Nm |
| 150 | M20 | 82 Nm | M20 | 82 Nm |
| 200 | M20 | 82 Nm | M20 | 82 Nm |
| 250 | M20 | 82 Nm | M24 | 140 Nm |
| 300 | M20 | 82 Nm | M24 | 140 Nm |
| 350 | M20 | 82 Nm | M24 | 140 Nm |
| 400 | M24 | 140 Nm | M27 | 210 Nm |
| 500 | M24 | 140 Nm | M30 | 280 Nm |
| 600 | M27 | 210 Nm | M33 | 380 Nm |
| 700 | M27 | 210 Nm | M33 | 380 Nm |
| 800 | M30 | 280 Nm | M36 | 640 Nm |
| 900 | M30 | 280 Nm | M36 | 640 Nm |
| 1000 | M33 | 380 Nm | M39 | 780 Nm |
| 1200 | M36 | 640 Nm | M45 | 1200 Nm |
| 1400 | M39 | 780 Nm | M45 | 1200 Nm |
| 1600 | M45 | 1200 Nm | M52 | 1900 Nm |
