Prestabo XL
Press connector system made of non-alloy steel for non-alloy steel pipes
Year built (from): | 1.4.2007 |
Trade mark rights exist for this document; for further information, go to viega.com/legal .
The information in this manual is directed at heating and sanitary professionals and trained personnel.
Individuals without the abovementioned training or qualification are not permitted to mount, install and, if required, maintain this product. This restriction does not extend to possible operating instructions.
The installation of Viega products must take place in accordance with the general rules of engineering and the Viega instructions for use.
Warning and advisory texts are set aside from the remainder of the text and are labelled with the relevant pictographs.
This symbol warns of possible life-threatening injury.
This symbol warns of possible serious injury.
This symbol warns of possible injury.
This symbol warns of possible damage to property.
This symbol gives additional information and hints.
This instruction for use contains important information about the choice of product or system, assembly and commissioning as well as intended use and, if required, maintenance measures. The information about the products, their properties and application technology are based on the current standards in Europe (e.g. EN) and/or in Germany (e.g. DIN/DVGW).
Some passages in the text may refer to technical codes in Europe/Germany. These should serve as recommendations in the absence of corresponding national regulations. The relevant national laws, standards, regulations, directives and other technical provisions take priority over the German/European directives specified in this manual: The information herein is not binding for other countries and regions; as said above, they should be understood as a recommendation.
The following standards and regulations apply to Germany / Europe and are provided as a support feature.
Scope / Notice | Regulations applicable in Germany |
---|---|
Planning, setup, operation and maintenance of fire extinguishing systems | DIN 14462 |
Scope / Notice | Regulations applicable in Germany |
---|---|
Suitability for low-salt / saline potable water | VDI-Richtlinie 2035, Table 1 |
Suitability for heating water for pump hot water heating systems | VDI-Richtlinie 2035, Sheet 1 and Sheet 2 |
Scope / Notice | Regulations applicable in Germany |
---|---|
Area of application of the EPDM sealing element
| DIN EN 12828 |
Scope / Notice | Regulations applicable in Germany |
---|---|
Entry of oxygen during re-filling of a system | DIN EN 14868 |
Oxygen content in low-salt / saline water | VDI-Richtlinie 2035 Table 1 |
Complete external corrosion protection for application in cooling circuits | DIN 50929 |
Complete external corrosion protection for application in cooling circuits | AGI-Arbeitsblatt Q 151 |
Scope / Notice | Regulations applicable in Germany |
---|---|
Requirements for material storage | DIN EN 806‑4, Chapter 4.2 |
Scope / Notice | Regulations applicable in Germany |
---|---|
Qualification of personnel for the assembly of flange connections | VDI-Richtlinie 2290 |
Determination of tightening torques | DIN EN 1591‑1 |
Scope / Notice | Regulations applicable in Germany |
---|---|
Test on a system that is finished but not yet covered | DIN EN 806–4 |
Leakage test for water installations | ZVSHK-Merkblatt: |
Requirements for filling and top-up water | VDI 2035 |
Agree the use of the system for areas of application and media other than those described with Viega.
The system is intended for use in industrial and heating systems. The system is not suitable for use in potable water installations. For this reason, pipes and press connectors are labelled with a red symbol "Not potable water".
The press connector system is designed for nominal pressure PN 16.
Use is possible in the following areas among others:
Industrial and heating systems
Wet sprinkler systems (with hot dip galvanised pipe)
Wet fire extinguishing systems, see Regulations from section: Application areas
Exclusively with hot dip galvanised pipe
Solar installations with flat collectors
Solar installations with vacuum collectors (only with FKM sealing element)
Compressed air systems
District heat supply systems in secondary circuits
Cooling water pipelines (closed circuit)
Vacuum systems (on request)
Systems for technical gases (on request)
Painting systems (only with labs-free components)
For information on areas of application of the sealing elements, see Sealing elements .
The system is intended for installation in warm and dry atmospheres. The pipes must not be subjected to constant dampness. Non-compliance may result in corrosion of the system, see Corrosion .
The system can be employed in closed water circuits, into which no oxygen can enter during operation.
The following limits are valid for the oxygen content, see Regulations from section: Media :
Low-salt water ≤ 0.1 mg/l
Saline water < 0.02 mg/l
The system is also suitable for the following media, amongst others:
For the applicable directives, see Regulations from section: Media .
Heating water for closed pump hot water heating systems
Compressed air (dry) in compliance with the specification of the sealing elements being used
EPDM at oil concentration < 25 mg/m3
FKM at oil concentration ≥ 25 mg/m3
Anti-freeze, cooling brines up to a concentration of 50 %
Do not use hot dip galvanised pipes for cooling water with additives (e.g. anti-freeze etc.). Otherwise, the zinc layer in the internal pipe may dissolve and unit components may get clogged.
The piping system consists of press connectors in connection with non-alloy steel pipes and the corresponding press tools.
The system components are available in the following dimensions: d 64.0 / 76.1 / 88.9 / 108.0.
Prestabo XL pipes are available in a length of 6 m.
The following pipes are available from the system described:
Type of pipe |
---|
Area of application |
d [mm] |
Type of galvanisation |
Thickness of the zinc plating |
Protective cap |
Prestabo XL pipe | Prestabo XL pipe for special applications |
---|---|
Industrial and heating systems | Sprinkler and compressed air systems |
64.0 / 76.1 / 88.9 / 108.0 | 64.0 / 76.1 / 88.9 / 108.0 |
externally galvanised | hot dip galvanised inside and outside |
8–15 μm | 15–27 μm |
Red | White |
Hot dip galvanised pipes are not suitable for heating and cooling systems.
d x s [mm] |
---|
64.0 x 2.0 |
76.1 x 2.0 |
88.9 x 2.0 |
108.0 x 2.0 |
Volume per metre of pipe [l/m] | Pipe weight [kg/m] |
---|---|
2.83 | 3.06 |
4.08 | 3.66 |
5.66 | 4.29 |
8.49 | 5.23 |
Only pipe clamps with chloride-free sound insulating inlays should be used to secure the pipes.
Observe the general rules of fixing technology:
Do not use fixed pipelines as a support for other pipelines and components.
Do not use pipe hooks.
Observe distance to press connectors.
Observe the expansion direction: Plan fixed and gliding points.
Make sure to affix the pipelines in such a way as to de-couple them from the installation body, so that they cannot transfer any structure-borne sound, resulting from thermal expansion or possible pressure surges, onto the installation body or other components.
Observe the following fixing distances:
d [mm] | Fixing distance between |
---|---|
64.0 | 4.00 |
76.1 | 4.25 |
88.9 | 4.75 |
108.0 | 5.00 |
Pipelines expand with heat. Heat expansion is dependent on the material. Changes in length lead to tension within the installation. These tensions must be compensated for with suitable measures.
The following are effective:
Fixed and gliding points
Expansion equalisation joints (expansion bends)
Compensators
Material | Heat expansion co-efficient ⍺ | Example: Length expansion with pipe lengths L = 20 m and ΔT = 50 K |
---|---|---|
Galvanised steel | 0.0120 | 12.0 |
The length expansion Δl can be taken from the diagram or can be calculated using the following formula:
Δl = ⍺ [mm/mK]× L [m]xΔ ϑ [K]
On Prestabo XL press connectors, there is a cutting ring, a separator ring and a sealing element in the bead of the press connector. The cutting ring cuts into the pipe during pressing and ensures a force-fit connection.
During installation, and later during the pressing, the separator ring protects the sealing element from damage from the cutting ring.
Viega press connectors are equipped with the SC‑Contur. The SC‑Contur is a safety technology that is certified by the DVGW and ensures that the press connector is guaranteed to be leaky in an unpressed state. In this way, inadvertently unpressed connections are noticed during a leakage test.
Viega guarantees that accidentally unpressed connections become visible during a leakage test:
with the wet leakage test in the pressure range from 0.1–0.65 MPa (1.0–6.5 bar)
with dry leakage test in the pressure range from 22 hPa–0.3 MPa (22 mbar–3.0 bar)
The press connectors are factory-fitted with EPDM sealing elements. For areas of use with higher thermal resistance, such as e.g. in the case of district heat supply systems, the press connectors must be equipped with FKM sealing elements.
The sealing elements can be distinguished as follows:
EPDM sealing elements are polished black.
FKM sealing elements are matt black.
Area of application |
---|
Use |
Operating temperature [Tmax.] |
Operating pressure [Pmax] |
Comments |
Heating | Solar installations | Cooling circuits | Compressed air | Technical gases |
---|---|---|---|---|
Pump hot water heating system | Solar circuit | Secondary circuit closed | all pipeline sections | all pipeline sections |
95 °C | 1) | ≥ -25 °C | 60 °C | — |
— | 0.6 MPa (6 bar) | 1.6 MPa (16 bar) | 1.6 MPa (16 bar) | — |
pursuant to the applicable regulations2) with radiator connection Tmax: 95 °C | for flat collectors | Inhibitor for water chiller, see material resistance | dry, oil content < 25 mg / m3 3) | 1) 3) |
1) | Consultation with Viega required |
2) | see Regulations from section: Sealing elements |
3) | See also document “Areas of application for metal installation systems” on the Viega website |
Area of application |
---|
Use |
Operating temperature [Tmax.] |
Operating pressure [Pmax] |
Comments |
District heat supply | Solar installations | Compressed air |
---|---|---|
District heating supply systems in secondary circuits | Solar circuit | all pipeline sections |
140 °C | 1) | 60 °C |
1.6 MPa (16 bar) | 0.6 MPa (6 bar) | 1.6 MPa (16 bar) |
To ensure that the system is installed according to the utility company's specifications, consult with the utility company before installation. | For vacuum pipe collectors 2) | dry 2) |
1) | Consultation with Viega required. |
2) | See also document “Areas of application for metal installation systems” on the Viega website |
The sealing materials of the press connector system are subject to thermal ageing, which depends on the media temperature and the service life. The higher the media temperature, the faster the thermal ageing of the sealing material progresses. In the case of special operating conditions such as industrial heat recovery systems, it is necessary to compare the specifications of the equipment manufacturer with the specifications of the press connector system.
Before using the press connector system outside the described areas of application or if in doubt about the correct material selection, please contact Viega.
Prestabo XL pipe | Prestabo XL pipe for special applications |
---|---|
Red continuous line | Red dotted line |
Red writing | Black writing |
The pipe markings contain important information regarding the material configuration and manufacture of the pipes. The red line on the pipes serves as a warning: "Not suitable for potable water!".
The meaning of the marking is as follows:
The red rectangle serves as a warning "Not suitable for potable water!".
The rectangle is to be found in the following places:
On the press end of the press connector
On the flange of the flange adapter
Corrosion can occur in the area of the three-phase boundary – water/material/air – in metallic materials. This corrosion can be prevented if the system remains completely full of water after its first filling and bleeding. If the installation is not to be commissioned immediately, carry out the pressure and leakage test using air or inert gases, see Leakage test .
The Prestabo system, in combination with externally galvanised pipes, can be used with its moulded and connection pieces in all closed cooling water circuits in which no oxygenation is possible during operation.
Due to the operating conditions in cooling water systems, it may be necessary to add anti-freeze to the carrier medium. The standard sealing elements made of EPDM can be used up to a glycol content of 50 % of the total water content. Internally and externally hot dip galvanised Viega pipes are not suitable for use in this case.
The re-filling of a system does not normally lead to significant oxygenation, see Regulations from section: Corrosion . However, the oxygenation can lead to damage (corrosion) in the system, if the circulating water is regularly replaced due to losses and (e. g. automatic topping up) considerable quantities of fresh water were added.
The oxygen content of low salt water should be <0.1 mg/l, in the case of saline water, be <0.02 mg/l, see Regulations from section: Corrosion .
Complete external corrosion protection, which reliably prevents corrosive influences, must be applied when using in cooling circuits. Observe the manufacturer's product information and the pertinent guidelines, see Regulations from section: Corrosion .
Prestabo pipes and the press connectors are protected by a thin galvanic zinc-plating coat. This galvanisation protects against moist surroundings, however not against external corrosion on a permanent basis. The system is intended for installation in warm and dry atmospheres. The components should not normally come into contact with water when properly installed and used as intended.
Constant dampness on the pipe occurs due to the following conditions e.g.:
due to condensation or precipitation during the construction phase
Condensation (e. g. when used in cooling circuits)
through cleaning or splash water as well as wastewater through defect floor seals etc.
when water reaches the pipeline installation in a non-intended way, e.g. due to a construction defect or water damage in the building.
The following measures should be observed to protect the Prestabo system from external corrosion:
Lay the pipelines outside of the areas at risk of dampness.
Avoid contact with corrosive building materials (e. g. filler or levelling screed).
Use waterproof separating foil in the floor construction to protect the laid pipelines against possible dampness, e. g. screed dampness. The overlapping foil overlaps must be sealed tightly.
Use closed-cell insulating hoses and seal properly. Take particular care to stick all of the abutting ends and cut edges together. However, the measures are no substitute for potentially necessary and additional corrosion protection.
In the case of installations, e. g. in industrial areas, which are contaminated with aggressive ambient air, observe the internal factory standards.
In areas where daily cleaning of the floor is deemed necessary (e. g. in hospitals), corrosion can also be caused by water and cleaning agent coming into contact with visible radiator connection lines that protrude from the floor. The water can seep through leaky joints between pipeline and the floor covering into the insulation. It is unable to escape and this leads to constant dampness around the pipes, which leads to external corrosion.
Disinfectant can also have a corrosive effect on pipelines.
Favour radiator connections out of the wall.
Use plastic coated Prestabo pipes for connections coming out of the floor.
Seal joints between pipeline and floor covering properly. Silicone joints must be maintained regularly.
Viega recommends to use the PP coated Prestabo pipe (model 1104) for laying the Prestabo system in the floor area or for concealed installation. The press connectors and pipe ends must be treated with a corrosion prevention agent — e.g. Denso Densolen ET 100, to ensure constant protection against corrosion. The relevant processing guidelines must be observed, whilst doing so.
Risk of corrosion from damaged surfaces
The galvanised surfaces of the components must not be damaged (e. g. with pointed objects). Otherwise there is a risk of corrosion.
Observe the following when transporting pipes:
Do not pull the pipes over the sill. The surface could be damaged.
Secure pipes during transportation. Pipes may become bent due to shifting.
Do not damage the protective caps on the pipe ends and do not remove them until immediately before mounting. Damaged pipe ends must not be pressed.
For storage, comply with the requirements specified in the applicable regulations, see Regulations from section: Storage :
Store components in a clean and dry place.
Provide ventilation.
Do not store the components directly on the floor.
Provide at least three points of support for the storage of pipes.
Do not cover the pipes with foils, prevent the formation of condensation.
Where possible, store different sizes separately.
Store small sizes on top of larger sizes if separate storage is not possible.
Store pipes of different materials separately to prevent contact corrosion.
System components may, in some cases, have become damaged through transportation and storage.
Check all parts.
Replace damaged components.
Do not repair damaged components.
Contaminated components may not be installed.
Danger due to electrical current
An electric shock can lead to burns and serious injury and even death.
Because all metallic piping systems conduct electricity, unintentional contact with a live part can lead to the whole piping system and components connected to it (e. g. radiators) becoming energised.
Only allow electrical work to be carried out by qualified electricians.
Always integrate the metal piping system into the potential equalisation.
It is the fitter of the electrical system who is responsible for ensuring that the potential equalisation is tested and secured.
Important instruction
With their material-specific qualities, sealing elements in press connectors are adapted for use with the corresponding media and/or the areas of use of the piping systems and are generally only certified for them.
The exchange of a sealing element is generally permitted. The sealing element must be exchanged for a designated spare part for the intended application Sealing elements . The use of other sealing elements is not permitted.
Exchanging a sealing element is permitted in the following situations:
if the sealing element in the press connector is obviously damaged and should be exchanged for a Viega spare sealing element made of the same material
if an EPDM sealing element should be exchanged for an FKM sealing element (higher thermal resistance, e.g. for industrial use)
d |
---|
a [mm] |
b [mm] |
64.0 | 76.1 | 88.9 | 108.0 |
---|---|---|---|
110 | 110 | 120 | 135 |
185 | 185 | 200 | 215 |
d |
---|
a [mm] |
b [mm] |
c [mm] |
64.0 | 76.1 | 88.9 | 108.0 |
---|---|---|---|
110 | 110 | 120 | 135 |
185 | 185 | 200 | 215 |
130 | 130 | 140 | 155 |
d |
---|
Minimum interval amin [mm] |
64.0–108.0 |
---|
20 |
d |
---|
64.0 |
76.1 |
88.9 |
108.0 |
amin [mm] |
---|
15 |
For the Z dimensions, refer to the respective product page in the online catalogue.
Prestabo XL connectors may only be pressed with Viega press rings in the dimensions 64.0–108.0. Connection with Viega press chains in the dimensions 76.1–108.0 is not permitted.
The following tools are required for production of a press connection:
Pipe cutter or a fine-toothed hacksaw
Deburrer and coloured pen for marking
press machine with constant pressing force of 32 kN
Press ring with corresponding hinged adapter jaw, suitable for the pipe diameter and with suitable profile
Viega recommends the use of Viega system tools when installing the press fittings.
The Viega system press tools have been developed and tailored specifically for the installation of Viega press connector systems.
Risk of injury due to sharp edges
There is a separator ring and a sharp-edged cutting ring above the sealing element (see arrow). There is a risk of injury (cutting) when replacing the sealing element.
Do not reach into the press connector with your bare hands.
Do not use pointed or sharp-edged objects to remove the sealing element. They may damage the sealing element or the bead.
Remove the sealing element from the bead, leaving the separator ring in the press connector.
Proceed carefully to avoid damaging the separator ring and sealing element seat.
Insert a new, undamaged sealing element into the bead below the separator ring.
Make sure that the sealing element is not damaged by the cutting ring.
Ensure that the complete sealing element is in the bead.
Leaking press connections due to damaged material!
Press connections can become leaky due to damaged pipes or sealing elements.
Observe the following instructions to avoid damage to pipes and sealing elements:
Do not use cutting discs (angle grinders) or flame cutters when cutting to length.
Do not use grease or oils (e. g. cutting oil).
For information about tools, also see Required tools .
Cut the pipe at a right angle as accurately as possible using a pipe cutter or a fine-toothed hacksaw to ensure a complete and even pipe insertion depth.
Avoid grooves on the pipe surface.
The pipe ends must be thoroughly deburred internally and externally after shortening.
Deburring prevents the sealing element being damaged or the that the press connector cants when mounted. Viega recommends using a deburrer (model 2292.4XL).
Damage due to the wrong tool!
Do not use sanding disks or similar tools when deburring. The pipes could be damaged by these.
Secure the pipe in the vice.
When clamping, leave an interval of at least 100 mm (a) to the pipe end.
The pipe ends must not be bent or damaged.
Deburr the inside and outside of the pipe.
Requirements:
The pipe end is not bent or damaged.
The pipe is deburred.
The correct sealing element is in the press connector.
EPDM = polished black
FKM = matt black
Sealing element, separator ring and cutting ring are undamaged.
The complete sealing element, separator ring and cutting ring are in the bead.
Measure the insertion depth in the press connector.
d [mm] | Insertion depth [mm] |
---|---|
64.0 | 43 |
76.1 | 50 |
88.9 | 50 |
108.0 | 60 |
Mark the insertion depth on the pipe.
Push the press connector up to the marked insertion depth on the pipe. Do not twist the press connector.
Place the hinged adapter jaw onto the press machine and push the retaining bolt in until it clicks into place.
Observe the press tool instruction manual.
Place the press ring onto the press connector. The press ring must completely cover the outside ring of the press connector.
Open the hinged adapter jaw.
Position the hinged adapter jaw into the seat of the press ring.
Carry out the pressing process.
Open the hinged adapter jaw and remove the press ring.
Remove the checking strip.
The connection is marked as having been pressed.
In the press connector system shown, flange connections in sizes 64.0 to 108.0 mm are possible.
The assembly of flange connections may only be carried out by qualified personnel. Personnel can be qualified to assemble flange connections on the basis of applicable directives, for example; see Regulations from section: Establishing a flange connection .
A corresponding training section on proper flange connection assembly in vocational training (of staff/specialist personnel) with qualified completion as well as successful regular application are considered as sufficient proof.
Other employees without the appropriate technical training (e.g. operating personnel) who are to install flange connections must be provided with technical knowledge through training measures (theoretical and practical); this must be documented.
The advantages of using hardened washers are:
Defined friction surface during assembly.
Defined unevenness in calculation and thus reduction of the scattering of the tightening torque, whereby a greater hexagon screw force can be achieved mathematically.
Fixed flange
Steel, galvanised, non-alloyed
Press connection made of unalloyed steel, galvanised
Model 1159XL: 64.0 to 108.0 mm (PN10/16)
Model 1159.1XL: 64.0 to 108.0 mm (PN6)
Always make the flange connection first and then the press connection.
If necessary, remove any temporary coatings on the flange sealing surfaces without leaving any residue before assembly, using cleaning agents and a suitable wire brush.
When replacing seals, make sure to remove the old seal completely from the flange sealing surface without damaging the flange sealing surface.
Ensure that the flange sealing surfaces are clean, undamaged and even. In particular, there must not be any radial surface damage such as grooves or impact marks.
The hexagon screws, nuts and washers must be clean and undamaged and comply with the specifications for minimum hexagon screw length and strength class, see Required tightening torques .
During disassembly, replace removed hexagon screws, nuts and washers with new ones if damaged.
The seal must be clean, undamaged and dry. Do not use adhesives and assembly pastes for seals.
Do not reuse used seals.
Do not use seals with kinks as they pose a safety risk.
Ensure that seals are free from faults and defects and that the manufacturer's specifications are complied with.
Lubricate the following flange elements with suitable lubricant:
Hexagon screw thread
Washer
Nut support
Observe the manufacturer's information on the application and temperature range of the lubricant.
The correct assembly of flange connections requires parallel aligned flange blades without an offset centre that allow the sealing element to be inserted in the correct position without damage.
Press the sealing surfaces far enough apart so that the seal can be inserted without force and without damage.
The gap (out-of-parallelism of the sealing surfaces) before tightening the hexagon screws is not critical if the permissible gap is not exceeded.
DN | Permissible gap a-b [mm] |
---|---|
50–100 | 0.6 |
Remove the gap from the gaping side (a).
In case of doubt, tighten the flanges without inserting a seal by tightening the hexagon screws to achieve parallelism and a sealing surface distance of approx. 10 % of the nominal torque.
The gap is not permissible if the flange position cannot be achieved without great effort.
The order in which the hexagon screws and nuts are tightened has a significant influence on the force distribution acting on the seal (surface pressure). Incorrect tightening leads to a high dispersion of the pretensioning forces and can result in the required minimum surface pressure not being reached and even in leaks.
After tightening the nut, at least two but no more than five threads should protrude from the end of the hexagon screw.
Prepare the hexagon screws by hand, observing the following:
Install the hexagon screws so that all the hexagon screw heads are on one flange side.
For horizontally arranged flanges, insert the hexagon screws from above.
Replace stiff hexagon screws with easy-running ones.
The simultaneous use of several tightening tools is possible.
Tighten all hexagon screws crosswise with 30 % of the nominal tightening torque.
Tighten all hexagon screws as described in step 1 with 60 % of the nominal tightening torque.
Tighten all hexagon screws as described in step 1 with 100 % of the nominal tightening torque.
Tighten all hexagon screws again with the full nominal tightening torque. Repeat this process until the nuts can no longer be turned when the full tightening torque is applied.
Model | DN | Article number | Thread | Min. required tightening torque [Nm] | Max. permissible tightening torque [Nm] | Hexagon screw length (mm) | Strength class |
---|---|---|---|---|---|---|---|
1159.1XL | 50 | 630 0581 | M12 | 28 | 82 | 50 | 8.8 |
65 | 629 9391 | 34 | |||||
629 94612 | M16 | 34 | 82 | 70 | 8.8 | ||
80 | 629 91512 | 55 | 202 | ||||
100 | 629 92212 | 66 |
Model | DN | Article number | Thread | Min. required tightening torque [Nm] | Max. permissible tightening torque [Nm] | Hexagon screw length (mm) | Strength class |
---|---|---|---|---|---|---|---|
1159XL | 32 | 716 8511 | M16 | 69 | 202 | 70 | 8.8 |
40 | 716 8681 | 77 | |||||
50 | 716 8751 | 87 |
1
| For use with mounting set article number
494063
|
Before starting to disassemble an existing flange connection, get approval and a work permit from the responsible company, if necessary, observing the following:
The system section must be depressurised and completely flushed.
Secure built-in or attached parts that are not held separately before loosening the flange connection. This also applies to fastening systems such as spring hangers and supports.
Start loosening hexagon screws or nuts on the side facing away from the body, loosen the remaining hexagon screws slightly and only disassemble completely when you have ensured that the piping system does not present a risk. If a pipeline is under tension, there is a risk of the pipeline rupturing.
Loosen the hexagon screws or nuts crosswise in at least two passes.
Close open ends of strands with dummy plugs.
Transport disassembled pipelines only in closed condition.
When replacing seals, make sure to remove the old seal completely from the flange sealing surface without damaging the flange sealing surface.
Caution when using an angle grinder!
When loosening defective hexagon screws and nuts with the help of an angle grinder, sparks are produced that can burn into the pipe material and cause corrosion.
The installer must perform a leakage test before commissioning.
Carry out this test on a system that is finished but not covered yet.
Observe the applicable regulations, see Regulations from section: Leakage test .
The leakage test pursuant to the applicable regulations must also be carried out for non-potable water installations, see Regulations from section: Leakage test .
Document the result.
To prevent corrosion after the leakage test has been performed with water, the system must remain full.
For the filling and top-up water, comply with the requirements specified in the applicable regulations, see Regulations from section: Leakage test .
Separate the product and packaging materials (e. g. paper, metal, plastic or non-ferrous metals) and dispose of in accordance with valid national legal requirements.