Weld Ring Gaskets & Lip Seals SPETORING® RM
The SPETORING® RM Weld Ring Seals are suitable for applications where it is absolutely necessary to have a leak proof joint and also where a limited opportunity for disassembling is required (which effects long time period between scheduled revisions). Special reasons for Weld Ring requirement may also be: containment of hazardous medium and combination of difficult working conditions (temperature shocks, vibrations, axial or lateral flange movements, etc.).
The main equipment where these seals are applied are pressure vessels (heat exchangers, thermal reactors, chemical apparatus, etc). Other group of applications are troublemaking pipeline connections, which request however usage of less sophisticated Weld Rings constructions.
Starting from 2010 all the Spetech Weld Rings where ‘seal to flange’ seam is welded from outside are possible to be installed for application with bars (partitions). This fact should make the Weld Rings Seals even more popular solution for ‘trouble making’ joints in the future.
SPETECH Weld Ring seals are manufactured to fit to EN, ASME, DIN, GOST, JIS, WN, OST or any other standards flanges. Commonly they are individually designed according to customer constructions and specifications.
SPETECH is supplying Weld Ring seals in diameter from 10mm up to 5500mm. We can use most of the popular materials. “One piece” seamless construction of the rings should be available for most of requests. Gasket materials are generally recommended to be the same or similar to the pipe or flange materials. The most popular materials for SPETORING RM are as follow. Other material on request.
| AISI/ASTM |
EN |
W. no. |
| A570 Gr.36 |
S235JRG2 |
1.0038 |
| A204 Gr. A/4017 |
16Mo3 |
1.5415 |
| F12 |
13CrMo4-5 |
1.7335 |
| F5 |
12CrMo19-5 |
1.7362 |
| 304 |
X5CrNi18-10 |
1.4301 |
| 304L |
X2CrNi19-11 |
1.4306 |
| 316 |
X5CrNiMo17-12-2 |
1.4401 |
| 316L |
X2CrNiMo17-12-2 |
1.4404 |
| 316Ti |
X6CrNiMoTi17-12-2 |
1.4571 |
| 321 |
X6CrNiTi18-10 |
1.4541 |
| 347 |
X6CrNiNb18-10 |
1.4550 |
| 318LN |
X2CrNiMoN22-5-3 |
1.4462 |
| Alloy C276 |
NiMo16Cr15W |
2.4819 |
| Alloy 400 |
NiCu30Fe |
2.4360 |
| Alloy 600 |
- |
2.4816 |
| Alloy 625 |
- |
2.4856 |
| Alloy 825 |
- |
2.4858 |
| B 348Gr.1 |
Ti99,8 |
3.7025 |
| B 348Gr. 2 |
Ti 99,7 |
3.7035 |
Depending on requirements a gasket profile is to be selected from table shown below.
| |
Symbol |
Description |
 |
R-M 1 |
Basic solution for application where the space between flanges is limited. Widely met as per DIN 2695 standard 4mm thick rings. Easiest solution either concerning material consumption and manufacturing cost. Inside weld seams are the only available option (errors on inside joint welding are difficult to repair). Any customised dimensions also available. Rewelding: can be re-welded up to 5 times, material loss ~3mm each. Radial compensation up to 0,3mm |
 |
R-M 2 |
This solution is technically based on idea similar to what is in RM-1 case but both outside weld seams/ inside weld seams option is available which substantially facilitate installation.
Customised construction available – starting from this profile all profiles with weld seam put from outside can be deliver with partitions. Rewelding up to 5times (3mm each loss) Please not the radial compensation is only like 0,1mm
|
 |
R-M 3 |
First of hollow lip weld-ring seals solution. It performs more thermal and pressure shock resistance compare to RM-1 and RM-2. But the ‘membrane’ effect is yet not that visible as the hollow lip small dimensions.
Customize cross-sections and partitions available. Outside weld seams available but as all this construction is strongly determined by existing limitations (not enough space between flanges for RM-5 and existing redial movements of the joint deserving the hollow-lip solution) the access to outside seam is difficult, which effect request of high performance in welding process. However re-welding is possible approx. 2-3times. Radial compensation up to 0,5mm
|
 |
R-M 4 |
Full size hollow lip weld-ring gasket (inside weld seam only available to flanges). Advanced construction recommended especially for large diameter joints. Capable to compensate great axial and radial differential expansions; extremely resistant to thermal and pressure shocks. The inside weld seam sometimes is a great advantage as prevent from crevice corrosion in compare to outside seam solution. If crevice corrosion is an important issue – than auxiliary inside seal should also be used.
Typical thickness of this weld ring is 2 x 15mm (30mm for full seal). Customised cross-section and diameters are available (which allows to install this adopted/ customized weld ring seal using existing flanges with shapes ready for other types of seals: spigot recess, delta shape, double cone, etc...). Rewelding up to 4times (easy to dismantle with 2mm cut-off disc). Radial compensation up to 5,0mm
|
 |
R-M 5 |
Full size hollow lip weld-ring gasket (outside weld seam possible). Most advanced construction recommended especially for large flanges and joints equipped in any partitions requested ! Capable to compensate great an axial and radial differential expansions; extremely resistant to thermal and pressure shocks.
Customised cross-section and diameters are available (which allows to install this adopted/ customized weld ring seal using existing flanges with shapes ready for other types of seals: spigot recess, delta shape, double cone, etc...). Rewelding up to 4times (easy to dismantle with 2mm cut-off disc). can be re-welded 2 to 4 times. Radial compensation up to 5,0mm
|
 |
SPETORING® R-M 4 / DryFlex® |
Auxiliary weld-ring gasket in different styles:
- installed either in groove closed from 4sides (Dryflex, Convex, Kammprofile, Spiral Wound, o-ring);
- installed in groove closed from 3sides (Dryflex, Convex, Kammprofile, o-ring),
- sealing profile (Dryflex, Convex, Kammprofile) machined on the weld ring surface.
The auxiliary gasket fulfill following functions:
- preventing from crevice corrosion (inside weld seam solutions case);
- hydraulic pressure test performed using this spare gasket, than final welding or repeat dismantling option;
- auxiliary gasket is used as reliable primary operational seal and the weld ring additional prevention seal if the primary one will fail.
|
|
