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GasThe innovative solution for
ManualWavin Tigris Gas
PE-X/AL PRESS FITTING SYSTEM
FOR GAS PIPES IN BUILDINGS
EPICG111 X71
May 2009
Contents
1. General page 21.1. Introduction page 21.2. The Wavin PE-X/Al pipe page 21.3. The Wavin Tigris gas press fitting page 21.4. The benefits of Wavin Tigris page 31.5. Expected service life and guarantee page 31.6. Quality marks page 3
2. Design page 32.1. Location of the pipes page 32.2. Function of the pipe sleeve page 42.3. Earthing page 42.4. Shut-off valves page 42.5. Determining pipe diameter page 42.6. General rules on noise page 7
3. Installing the Wavin PE-X/Al pipe system page 83.1. Expansion and fixing page 83.2. Bending of Wavin PE-X/Al pipes page 93.3. Making connections page 103.4. Pressing tool page 103.5. Threaded connections page 103.6. Protecting against external influences page 113.7. Pressure testing page 11
4. Technical data page 12
Branches page 12
1Gas
Wavin Tigris Gas manualContents
TEL.www.wavinoverseas.com
Wavin Tigris Gas manual
General
1. General
1.1. Introduction
The Wavin Tigris Gas System can be
used for installing permanent gas pipes
within domestic buildings, in compliance
with NEN 1078 and NEN 8078, with a
maximum pressure of 200 mbar. This
means the system is suitable for gas
piping having a nominal operating
pressure of 25 or 100 mbar.
The Wavin Tigris Gas System is not
intended for use in industrial and
agricultural applications.
1.2. The Wavin PE-X/Al pipe
Wavin PE-X/Al pipes consist of five
layers.
The centre of the pipe has a butt welded
aluminium pipe as its core. The
aluminium pipe is butt welded offering a
consistent wall thickness. The inner
layer is made of PE-Xc, electron beam
cross-linked PE.
Naturally, the Wavin PE-X/Al pipe
cannot and must not be used as an
earth pipe.
Wavin PE-X/Al pipes can easily be bent
by hand using a pipe bending spring or
pliers. The pipe retains its shape and
does not spring back after bending.
This makes it easy to bend the pipe
around obstacles without tension,
reducing the need for fittings and
lowering flow resistance.
The pipe is usually laid directly from a
coil so it can be installed quickly and
few fittings are required. Wavin PE-X/Al
can be supplied in straight lengths for
visible parts or in conduit to meet local
regulations.
1.3. The Wavin Tigrisgas press fitting
Wavin Tigris press fittings are made of
brass. The fittings have a stainless steel
sleeve. This sleeve has an inspection
window that allows the correct insertion
depth of the pipe to be checked during
pressing work. Sealing is done with two
O-rings.
2 TEL.+31 (0)523-624 911
FAX+31 (0)523-624 600
Fig. 1. Wavin PE-X/Al pipe
Fig. 2. Through the inspection window
you can see that the pipe has
been inserted far enough
Fig. 3. The Wavin Tigris fitting with
pressed ferrule
Fig. 4. The Wavin Tigris threaded fitting
fitting, and the window on the sleeve
can be used to see whether the pipe is
inserted far enough into the fitting.
The O-ring on the bushing ensures that
the fitting is now completely gastight.
In order to tighten the connection
permanently, pressing tongs are used to
deform the ferrule to clearly show it has
been pressed.
The brass threaded fittings have a
yellow ring that also prevents contact
corrosion between the brass fitting and
the aluminium layer of the pipe. The
threaded fittings are used to connect
valves or appliances and for junctions
with other materials.
Cross-linking improves the PE in terms
of temperature resistance and service
life. The robust outer layer consists of
PE-Xb, which prevents the aluminium
layer from becoming exposed to
the atmosphere. As a result, the
Wavin PEX/Al pipe is resistant to all
forms of corrosion, aging and
weathering. The outer layer of the pipe
is yellow so it can be recognised easily.
A special adhesive is used to bond both
PE layers to the aluminium core for the
duration of its service life.
The programme includes a calibration
and trimming tool: when used correctly,
the pipe is free from burrs and no
burrs can enter the pipe. The trimmed
pipe is pushed onto the spigot of the
Wavin Tigris Gas manual
Design
2. Design
1.4. The benefits of WavinTigris
The pipes and fittings combine the
benefits of plastic and metal to produce
an optimum product. The key benefits
of the system are:
High corrosion resistance
Shape retention but can still be bent
by hand
Minimum expansion
Diffusion-tight seal
Rapid and easy assembly
(inspection window for checking)
Fitter-independent O-ring seal
Simple, uncomplicated pressing
technique (deformation of the ferrule
visible after pressing)
No risk of burrs in the pipe
No fire hazard because the
connections are fitted without heat
or flame
Low labour costs, particularly when
working with coils
1.5. Expected service lifeand guarantee
Wavin PE-X/Al pipes and Wavin Tigris
gas fittings are designed for a minimum
service life of 50 years.
Regardless, if the pipes are installed
professionally in accordance with
Wavin's work instructions, Wavin
provides a 10-year guarantee from the
date of delivery on material defects in
Wavin pipes and fittings (see guarantee
conditions).
1.6. Quality marks
Wavin PE-X/Al pipes and Wavin Tigris
have a GASKEUR approval (issued by
GASTEC) for use as a gas pipe system.
2.1. Location of the pipes
Wavin Tigris gas pipes must be
protected against mechanical damage.
In many markets, gas pipes must only
be visible in the meter cupboard and
nowhere else. In that case, the pipe
must be fitted with a pipe sleeve or
another type of encapsulation or
sheath. The pipes are usually concealed
in the walls or floors of new buildings.
We recommend that a pipe sleeve is
fitted around the pipe as well here to
prevent damage during the building
phase.
In principle, gas pipes may be laid in
the ground unprotected, but we
recommend that pipe sleeves are also
fitted on the pipes here to prevent the
risk of damage during digging work.
NPR 3378-7 states that pipes must not
be laid in the ground under buildings,
with the exception of horticultural
greenhouses.
Brass fittings for underground pipes
must be taped up to protect them
against moisture. Pipes in inaccessible
spaces such as above fixed ceilings
and behind panelling must be enclosed
in a pipe sleeve. The inside diameter of
the pipe sleeve must be at least 10 mm
greater than the outside diameter of the
gas pipe (there must be a 5 mm
clearance around the pipe). The pipe
sleeve must protrude from the wall by
at least 20 mm and be open on both
sides. No metal pipes or fittings must
be used in crawl spaces. Wavin Tigris
gas pipes in pipe sleeves may be laid in
crawl spaces (without fittings).
TEL.www.wavinoverseas.com
3Gas
Fig. 5. In inaccessible spaces, the gas
pipe must be inserted in a pipe
sleeve.
The pipe must have at least 6 mm
clearance in the pipe sleeve.
Do not bend pipe over hard,
sharp edges (see arrow)
Wavin Tigris Gas manual
Design
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2.2. Function of the pipesleeve
1. To protect pipes during use:
exposed pipes.
2. To protect pipes during installation:
embedded pipes.
3. To make it simple to replace pipes:
pipes that cross walls or floors,
pipes in inaccessible spaces.
The pipe should run as straight as
possible to make replacement
possible. The ends of the pipe sleeve
must provide gas resistance through
walls and brickwork and protrude
from the wall by at least 20 mm.
4. To ensure that no gas escapes to
inaccessible spaces if there is a leak.
The above functions will be combined
in a number of cases.
If a pipe sleeve is used, you must
ensure that, if there is a leak, the gas
between the pipe sleeve and gas pipe
is able to escape to an accessible and
ventilated area.
With wall and floor lead-throughs, the
pipe sleeve must protrude by at least
20 mm.
2.3. Earthing
Wavin Tigris gas pipes cannot and must
not be earthed. Although the pipe
contains a metal layer (aluminium), this
is completely shielded and therefore
insulated by the outer PE-Xb layer.
Earthing this would result in damage to
the outer layer and risk of corrosion.
2.4. Shut-off valves
NPR 3378 specifies where shut-off
valves must be fitted in the gas pipe.
For houses, this means that a shut-off
valve must be fitted by the entrance to
a house or housing unit (main cock) and
for each individual gas appliance. The
shut-off valve for a gas appliance can
also be used for this purpose. For other
situations please see NPR 3378-5.
If only gas appliances with a flame
failure device have been used, then a
low-pressure shut-off valve is not
needed.
In houses where not all appliances are
fitted with a flame failure device, it is
sufficient to have one low-pressure
shut-off valve immediately behind the
main valve.
2.5. Determining pipediameter
The loss in pressure from the main
valve to each individual consumer
appliance must not exceed 1.7 mbar.
The diameter of the different gas pipes
must therefore be chosen in order to
comply with this. The pressure loss
depends on the flow rate and therefore
the required capacity, the pipe length
and the number of fittings.
Each design starts with a sketch of the
required pipe route and a decision on
the load of the various appliances
connected. If several appliances are
connected to a specific route, the total
load is taken. In a limited number of
cases, a simultaneity factor may be
used in calculations, as it can be
assumed that not all appliances will be
used at the same time (see Figure 6).
Once the load for each pipe section is
known, a pipe diameter can be chosen.
(To make an initial choice, dividing
1.7 mbar by the length of the longest
pipe section calculates the required
pressure loss per metre, and the table
in Figure 7 can then be used to select
a diameter).
The pressure loss table in Figure 7 and
incorporation of the pressure losses of
any fittings in accordance with Figure 8
are then used to check whether the
total pressure loss to each appliance
remains under 1.7 mbar. If the loss of
pressure is too great, then a larger
diameter will need to be chosen for at
least part of the pipe. In most cases,
this will be the section where the
greatest flow rate occurs.
In practice, a 16 mm pipe diameter
seems to be sufficient up to 10 kW,
a 20 mm diameter up to 20 kW and a
25 mm diameter up to 40 kW.
Fig. 6. Permissible simultaneity factors for gas pipes. In all other cases,
calculations must be made with a simultaneity factor of 1.
Pipe to gas stove 0.7
Pipe section for three or more appliances 0.8 (but at least equal to the following section)
Wavin Tigris Gas manual
Design
TEL.www.wavinoverseas.com
5Gas
Fig. 7. Pressure loss per metre of Wavin Tigris gas pipes
Connected Required Required 16 20 25load volume flow volume flow speed Pressure loss speed Pressure loss speed Pressure loss(kW) m3/s m3/h m/s mbar/m m/s mbar/m m/s mbar/m
1 0.00003 0.10 0.25 0.00 0.15 0.00 0.09 0.002 0.00006 0.21 0.50 0.00 0.30 0.00 0.18 0.003 0.00009 0.31 0.76 0.01 0.45 0.00 0.27 0.004 0.00011 0.41 1.01 0.02 0.60 0.00 0.36 0.005 0.00014 0.51 1.26 0.03 0.76 0.01 0.45 0.006 0.00017 0.62 1.51 0.04 0.91 0.01 0.54 0.007 0.00020 0.72 1.76 0.05 1.06 0.01 0.63 0.008 0.00023 0.82 2.02 0.07 1.21 0.02 0.73 0.019 0.00026 0.92 2.27 0.08 1.36 0.02 0.82 0.01
10 0.00028 1.03 2.52 0.10 1.51 0.03 0.91 0.0111 0.00031 1.13 2.77 0.12 1.66 0.03 1.00 0.0112 0.00034 1.23 3.02 0.15 1.81 0.04 1.09 0.0113 0.00037 1.33 3.28 0.17 1.96 0.05 1.18 0.0114 0.00040 1.44 3.53 0.20 2.11 0.06 1.27 0.0215 0.00043 1.54 3.78 0.23 2.27 0.06 1.36 0.0216 0.00046 1.64 4.03 0.26 2.42 0.07 1.45 0.0217 0.00048 1.74 4.28 0.30 2.57 0.08 1.54 0.0218 0.00051 1.85 4.53 0.33 2.72 0.09 1.63 0.0319 0.00054 1.95 4.79 0.37 2.87 0.10 1.72 0.0320 0.00057 2.05 5.04 0.41 3.02 0.11 1.81 0.0321 0.00060 2.15 5.29 0.45 3.17 0.13 1.90 0.0422 0.00063 2.26 5.54 0.49 3.32 0.14 2.00 0.0423 0.00066 2.36 5.79 0.54 3.47 0.15 2.09 0.0424 0.00068 2.46 6.05 0.59 3.62 0.16 2.18 0.0525 0.00071 2.56 6.30 0.64 3.78 0.18 2.27 0.0526 0.00074 2.67 6.55 0.69 3.93 0.19 2.36 0.0527 0.00077 2.77 6.80 0.74 4.08 0.21 2.45 0.0628 0.00080 2.87 7.05 0.80 4.23 0.22 2.54 0.0629 0.00083 2.97 7.31 0.86 4.38 0.24 2.63 0.0730 0.00085 3.08 7.56 0.92 4.53 0.26 2.72 0.0731 0.00088 3.18 7.81 0.98 4.68 0.27 2.81 0.0832 0.00091 3.28 8.06 1.05 4.83 0.29 2.90 0.0833 0.00094 3.38 8.31 1.11 4.98 0.31 2.99 0.0934 0.00097 3.49 8.57 1.18 5.13 0.33 3.08 0.0935 0.00100 3.59 8.82 1.25 5.29 0.35 3.17 0.1036 0.00103 3.69 9.07 1.32 5.44 0.37 3.27 0.1037 0.00105 3.79 9.32 1.40 5.59 0.39 3.36 0.1138 0.00108 3.90 9.57 1.47 5.74 0.41 3.45 0.1139 0.00111 4.00 9.83 1.55 5.89 0.43 3.54 0.1240 0.00114 4.10 10.08 1.63 6.04 0.45 3.63 0.1341 0.00117 4.21 10.33 1.72 6.19 0.48 3.72 0.1342 0.00120 4.31 10.58 1.80 6.34 0.50 3.81 0.1443 0.00123 4.41 10.83 1.89 6.49 0.53 3.90 0.1544 0.00125 4.51 11.09 1.98 6.64 0.55 3.99 0.1545 0.00128 4.62 11.34 2.07 6.80 0.57 4.08 0.1646 0.00131 4.72 11.59 2.16 6.95 0.60 4.17 0.1747 0.00134 4.82 11.84 2.26 7.10 0.63 4.26 0.1848 0.00137 4.92 12.09 2.35 7.25 0.65 4.35 0.1849 0.00140 5.03 12.34 2.45 7.40 0.68 4.44 0.1950 0.00142 5.13 12.60 2.55 7.55 0.71 4.53 0.2051 0.00145 5.23 12.85 2.66 7.70 0.74 4.63 0.2152 0.00148 5.33 13.10 2.76 7.85 0.77 4.72 0.2153 0.00151 5.44 13.35 2.87 8.00 0.80 4.81 0.2254 0.00154 5.54 13.60 2.98 8.15 0.83 4.90 0.2355 0.00157 5.64 13.86 3.09 8.31 0.86 4.99 0.2456 0.00160 5.74 14.11 3.21 8.46 0.89 5.08 0.2557 0.00162 5.85 14.36 3.32 8.61 0.92 5.17 0.2658 0.00165 5.95 14.61 3.44 8.76 0.96 5.26 0.2759 0.00168 6.05 14.86 3.56 8.91 0.99 5.35 0.2860 0.00171 6.15 15.12 3.68 9.06 1.02 5.44 0.29
Example calculation,
see Figure 9.
House with a central heating system
of 34 kW and a stove of 14 kW.
Wavin Tigris Gas manual
Design
6 TEL.+31 (0)523-624 911
FAX+31 (0)523-624 600
Stove14 kW
CV34 kW
C (10 kW)
6 m
A (44 kW)
B (34 kW)
8 m
2 m
6 3
4
21
5
12345
A simultaneity factor of 0.7 applies to the stove;
so calculations can be made with 0.7 x 14 = 10 kW.
Pipe section C therefore transports 10 kW,
pipe section B 34 kW and pipe section A 44 kW.
The longest section A + B has a length of 10 m.
Total pressure loss must not exceed 1.7 mbar, which is
0.17 mbar/m.
In Figure 7, find the pipe for 44 kW. Pipe 20 has a pressure
loss of 0.55 mbar/m and therefore does not comply. Pipe
25 has a pressure loss of 0.15 mbar/m and therefore does
comply. Pipe 25 is chosen for pipe section A.
20 mm appears to be too small for pipe section B, 34 kW.
This has a pressure loss of 0.33 mbar/m, which means
that the pressure loss for B would be 2.64 mbar with a
length of 8 m. This is why 25 mm is also chosen for pipe
section B.
Fig. 8. Resistance factors and equivalent
pipe length of Wavin Tigris gas
fittings
Fig. 9. Example of pipe route
RReessiissttaannccee EEqquuiivvaalleenntt
λ ((--)) ppiippee lleennggtthh ((mm))
Straight coupler 16 mm 2.4 0.6
Straight coupler 20 mm 2.0 0.7
Straight coupler 25 mm 1.1 0.5
Elbow 90° 16 mm 3.7 1.0
Elbow 90° 20 mm 2.9 1.0
Elbow 90° 25 mm 2.6 1.2
Transition 16 x ½ male/female 2.4 0.6
Transition 20 x ½ male/female 2.0 0.7
Transition 20 x ¾ male/female 2.0 0.7
Transition 25 x ¾ male/female 1.1 0.5
Transition 25 x 1 male 1.1 0.5
Tee 16/16/16 straight flow 2.4 0.6
Tee 16/16/16 flow to branch 3.7 1.0
Tee 20/20/20 straight flow 2.0 0.7
Tee 20/20/20 flow to branch 2.9 1.0
Tee 25/25/25 straight flow 1.1 0.5
Tee 25/25/25 flow to branch 2.6 1.2
Tee 20/16/20 straight flow 2.0 0.7
Tee 20/16/20 flow to branch 2.4 0.6
Tee 25/16/25 straight flow 1.1 0.5
Tee 25/16/25 flow to branch 2.4 0.6
Tee 25/20/25 straight flow 1.1 0.5
Tee 25/20/25 flow to branch 2.0 0.7
Wavin Tigris Gas manual
Design
TEL.www.wavinoverseas.com
7
Check pressure loss for section A + B
The total pressure loss for pipe section A including fittings is:
Pipe 25: 2.0 m
Fitting 1, 25 x ¾: 0.5 m
Fitting 2, elbow 25: 1.2 m
Fitting 3, tee 25x16x25 (straight): 0.5 m
Total: 4.2 m x 0.15 mbar/m = 0.63 mbar
The total pressure loss for pipe section B including fittings is:
Pipe 25: 8.0 m
Fitting 4, elbow 25: 1.2 m
Fitting 5, 25 x ¾: 0.5 m
Total: 9.7 m x 0.09 mbar/m = 0.87 mbar
Total pressure loss for pipe section A + B = 0.63 + 0.87 = 1.5 mbar.
For pipe section C, we look at 10 kW in Figure 7. Pipe 16
has a pressure loss of 0.10 mbar/m and therefore seems suitable.
Check pressure loss for section A + C
The total pressure loss for route C including fittings is:
Pipe 16: 6.0 m
Fitting 3, T 25x16x25 (branch): 0.6 m
Fitting 6, 16 x ½: 0.6 m
Total: 7.2 m x 0.10 mbar/m = 0.72 mbar
Pipe section A has a pressure loss of 0.63 mbar (see above),
making the total pressure loss for A + C 0.72 + 0.63 = 1.35 mbar
2.6. General rules on noise
Noise nuisance in gas pipes primarily
occurs in fittings. It is therefore
preferable to install as few fittings as
possible in the vicinity of areas that are
in use.
The pipe diameter must be chosen so
that the flow rate in or near occupied
rooms is not faster than 15 m/s at any
point. To limit loss of pressure, the flow
rate will never exceed 5 m/s in most
cases, so that noise nuisance is never a
problem in reality.
Gas
Wavin Tigris Gas manual
Installing the Wavin PE-X/AI pipe system
8 TEL.+31 (0)523-624 911
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3. Installing the Wavin PE-X/Al pipe system
The use of metal fittings and the inner
aluminium layer of the pipe ensure that
gas will not escape easily in the event
of a fire. The pipe must, of course,
be protected against extremely high
temperatures, so pipes must not be laid
above heating appliances or close to
electrical devices that can generate
heat.
3.1. Expansion and fixing
All pipe materials expand when heated
and contract when cooled. For gas
pipes, the expected differences in
temperature are limited (15° - 30°C).
Greater temperature differences will
only need to be taken into account
when pipes are installed under
extremely high or low ambient
temperatures. The linear expansion
coefficient of Wavin PE-X/Al pipes is
0.025-0.030 mm/mK (irrespective of the
pipe diameter).
Figure 6 can be used to calculate the
expected elongations for Wavin PE-X/Al
pipes in practice with a temperature
reduction of 5°C (e.g. from 20 to 15°C)
and a temperature increase of 10°C.
The change in length can also be
calculated using the following formula:
ΔI = α x L x ΔT
ΔI = change in length (mm)
α = linear expansion coefficient (mm/mK)
L = pipe length (m)
T = difference in temperature (K)
When pipes are anchored, one fixed point
is fastened to each straight pipe, usually
in the middle. The fixed points are
attached to the pipe, not right next to
a fitting. The other brackets must be
sliding brackets so that the pipe can
move freely when expanding and
contracting. When the pipe changes
direction, there must be sufficient room
behind the bends or tees to
accommodate the movement in length
of the straight pipe.
Temperature difference [K]
Pip
e le
ngth
[m]
Leng
th c
hang
e [m
m]
0 20 40 60 80
23222120191817161514131211109876543210
10
9
8
7
6
5
4
3
2
1
Fig. 10. Change in length of Wavin PE-X/Al pipes (based on _ = 0.025 mm/mK
FP = Fixed point
GL = Slider point
Fig. 11. Fixed point and slider brackets.
Wavin Tigris Gas manual
Installing the Wavin PE-X/AI pipe system
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9Gas
Fig. 12. Bracket distance for
Wavin PE-X/Al pipes: 60.D
Expansion bends can be used for very
long straight pipes or fixed end points.
It is generally more than adequate to
choose a length for the bent sections of
an expansion bend that is equal to the
bracket distance (see Figures 11 and 12).
Checks must be carried out for very large
distances and considerable differences in
temperature, (see Section 3.2).
Pipe size Pipe weight Bracket distance
mm kg/m m
16 0.095 0.9
20 0.138 1.2
25 0.220 1.5
The wall on which the brackets are
secured must be sturdy enough to
support the pipe, taking into
consideration any extra load resulting
from jolts etc. A shorter bracket
distance can be used if necessary or,
if the base is weak, a rail or plank can
be fitted to which the brackets can be
secured. See Figure 12 for the weights
required.
Heavy accessories, gas appliances etc.
must not be hung from the gas pipe.
In concrete floors and walls, the
expansion forces can be absorbed by
the surrounding concrete. The forces
that occur are so low that no changes
in length occur. The pipe must be
protected where it exits the concrete.
This is usually done by fitting an
oversized pipe sleeve and allowing it to
protrude from the wall by at least
20 mm (see Figure 5).
With floors, the top of the gas pipe
must lie at least 35 mm under the
finishing layer to prevent damage from
nails or screws.
In principle, the pipes can be placed in
concrete without a casing, but care
must be taken to ensure that the pipes
are not damaged when the concrete is
poured in. Changes in length must be
taken into account if a pipe sleeve is
then used in this case. With changes in
direction, insulation must be used so
that it can absorb the expansion
(insulation thickness = 1.5 x expected
expansion).
When pipes are installed in plastered
walls (e.g. in slotted grooves), the
plaster work is usually not strong
enough to absorb the expansion forces.
The pipes must then be inserted in a
pipe sleeve and sufficient space must
be left where they change direction to
accommodate the expansion.
Fig. 13. Bending Wavin PE-X/Al pipes with and without a pipe bending spring
3.2. Bending of Wavin PE-X/Al pipes
As the pipes are easy to bend by hand,
only a few fittings will usually be
required. Pipes can be bent with or
without a pipe bending spring
(see Figure 13).
Buckled pieces of pipe must be
removed as they may impede the flow
of gas in the pipe.
If a pipe bending spring is used, the
bending radius can be decreased
(see Figure 14).
Fig. 14. Minimum bending radius of
Wavin PE-X/Al pipes
Pipe size Bending Bending by hand radius pipe radius
bending springmm mm mm
16 x 2.0 5 x Da ≈ 80 4 x Da ≈ 64
20 x 2.25 5 x Da ≈ 100 4 x Da ≈ 80
25 x 2.5 5 x Da ≈ 125 4 x Da ≈ 100
Wavin Tigris Gas manual
Installing the Wavin PE-X/AI pipe system
10 TEL.+31 (0)523-624 911
FAX+31 (0)523-624 600
If an expansion bend is used in a pipe
route, a certain length of bent section
must be kept, depending on the
expected expansion. This expansion
depends on the length of pipe and the
expected temperature change (see
Section 3.1). Once the expansion has
been determined, Figure 15 can be
used to determine the minimum length
of the bent section.
3.3. Making connections
Pipes are difficult to clean once they
have been installed, therefore try to
prevent the inside of the pipe becoming
dirty.
Make a square cut in the pipe using
tongs or a pipe cutter.
Re-round the pipe by using the
Wavin calibration tool. This removes
burrs and bevels the pipe. Insert the
calibration tool using a rotating
motion until the stop. Make at least
one complete rotation with the
calibration tool and then remove it
using a rotating motion. Check the
length of the internal bevel:
at least 1 mm for 16–25 mm pipe.
Apply a little lubricant if necessary
to the internal bevel of the pipe end.
Insert the pipe into the fitting until
the stop and check the insert length
through the window in the ferrule.
Lay the jaw of the pressing tongs
against the stop on the fitting and
carry out the pressing. The fitting
procedure is complete when the jaw
is fully closed.
The gas pipe must not be rotated in
the fitting after pressing.
3.4. Pressing tool
The Wavin pressing tool must be used
for pressing work. A limited number of
other brands of pressing tools and/or
pressing jaws can also be used; please
consult your Wavin representative.
The pressing jaws must be kept clean
and undamaged.
The pressing jaws must also be
inspected annually to ensure they can
still be used to make good connections.
This applies to pressing jaws for manual
pressing tools and for hydraulic tools.
Electrical pressing tools must also be
inspected annually to check their
electrical safety and effective operation.
Both inspections can be performed by:
HK Electric
PO Box 71
5320 AB Hedel, The Netherlands
Tel. +31 (0)73 - 599 7 599
Fax. +31 (0)73 - 599 7 590
Email: [email protected]
3.5. Threaded connections
Wavin Tigris threaded fittings are
threaded with gas pipe thread in
accordance with ISO 7/1; the female
thread is parallel and the male thread
is conical.
All Wavin Tigris threaded fittings are
cleaned at the factory. In principle,
threading oil eliminates the need to
clean the fitting. This is why it is
advisable to keep the fitting in its
packaging for as long as possible.
The threaded fitting will need to be
cleaned if it has come into contact with
oil or grease.
The Wavin Tigris fittings with an outside
thread are serrated to make it easier to
attach sealing tape.
16 x 2,0020 x 2,2525 x 2,50
1600
1400
1200
1000
800
600
400
200
00 5 10 15 20 25 30 35 40 45 50
Fig. 15. Determination of the length of the bent section for Wavin PE-X/Al pipe
Length change [mm]
Pip
e si
ze [m
m]
Ben
t se
ctio
n [m
m]
Wavin Tigris Gas manual
Installing the Wavin PE-X/AI pipe system
TEL.www.wavinoverseas.com
11Gas
Fitting a threaded fitting:
Apply plenty of Teflon tape to the
outside thread and screw both
threaded fittings together by hand.
After tightening the connection
manually, use an open-ended
spanner to tighten the connection
a further two turns at most.
Do not turn the fittings back as this
could cause leakage.
Make the connection to the Wavin
Tigris pipe as described above.
Do not rotate the Wavin Tigris gas
pipe after pressing.
A liquid gasket can be used instead of
Teflon tape. The gasket material must
always comply with approval
specification no. 31. A gasket with the
GASTEC QA label satisfies this approval
specification.
3.6. Protecting againstexternal influences
Gas pipes in general, and therefore also
Wavin Tigris gas pipes, must not be
exposed to direct sunlight or other
sources of heat.
High concentrations of ozone can affect
the rubber seals of the press fittings.
Wavin Tigris gas pipes must therefore
not be laid near appliances that can
emit a considerable amount of ozone;
particularly appliances with electrical
discharges such as some types of
electric motors and fluorescent tubes.
As Wavin Tigris gas pipes are mainly
made of plastic, they are highly
resistant to a large number of chemical
substances. If it is likely that specific
chemical substances could come into
contact with the Wavin Tigris gas pipe,
we advise you to contact Wavin to
check the chemical resistance to the
substance in question. Horizontal pipes
must run at least 50 mm above a floor
to reduce the risk of damage.
Wavin Tigris gas pipes are resistant to
condensed water that could fall on the
pipe. The fittings must be protected
from condensation.
3.7. Pressure testing
Each gas pipe must be submitted to a
pressure test after installation. Pressure
testing is done in two steps:
1. A strength test with an air pressure of
5 bar for 10 seconds. The main
purpose of this test is to ensure that
connections do not come apart,
for example because they have not
been pressed.
A plastic pipe with connections can
creep during the pressure test.
This means that during and after an
increase in pressure to the pipes,
the pipe will expand leading to a
drop in pressure even though there
is no leak.
Always take the required precautions
with a view to safety. The stored
energy with large pipe sections can
be high enough that an improperly
secured cap or fitting can shoot
loose at high speed.
2. A sealing test at low pressure.
The purpose of this test is to
determine whether the connections
are completely gas tight. Some
connections can be gas tight at high
pressure but leak at a low pressure.
At high pressure, the O-ring is
compressed so strongly that it may
seal minor damage to the pipe
surface (scratches). At low pressure,
the pressure on the O-ring is less
which means that any damage is not
sealed. Gas tightness at 5 bar is
therefore no guarantee of gas
tightness at operating pressure.
The sealing test is performed with air
or nitrogen for at least 3 minutes at
a test pressure of 125 mbar (nominal
operating pressure + 100 mbar).
No drop in pressure is permitted
during this test. A change in ambient
temperature and barometric pressure
can influence the manometer
reading. These two quantities must
therefore be constant during the test.
The connections must be visible during
the sealing test.
After fitting the appliances, the
complete gas installation as a whole
must be tested to ensure it is leak proof
with natural gas at operating pressure.
After closing the main valve, the
pressure must not drop by more
than 1 mbar during the test time of
3 minutes.
Wavin Tigris Gas manual
Technical data / Branches
GasTEL.www.wavinoverseas.com
12
4. Technical data / Branches
Pipe composition Inner pipe: cross-linked PE (PE-Xc)
Outer pipe: cross-linked PE (PE-Xb)
Intermediate layer: aluminium pipe without
overlap
All layers bonded with a special adhesive
Pipe colour Yellow
Fittings Brass
Colour of threaded fittings Brass/yellow
O-ring material NBR
Maximum temperature 95°C
Linear thermal expansion coefficient
of the pipe 0.025–0.030 mm/mK
Resistance of the pipe to heat conduction 0.4 W/mK
Pipe roughness 0.007 mm
4.1. Technical data for the Wavin PE-X/Al gas pipe system
© 2009 Wavin Netherlands B.V.
The information presented in this manual is based on our current knowledgeand experience. Nevertheless, we accept no liability for the consequencesof any errors or omissions contained herein. Sections of the contents mustonly be copied if the source is acknowledged.
Wavin Tigris Gas Manual
www.wavinoverseas.com
0509
09-0
9740
2986
6
WWaavviinn OOvveerrsseeaassRollepaal 197701 BR DedemsvaartPO Box 1587700 AD Dedemsvaart, The NetherlandsTelephone +31 (0)523-624 911Fax +31 (0)523-2624 600Internet www.wavinoverseas.comE-mail [email protected]
Product range:Wavin supplies plastic pipe systems with a complete range of fittings for the following areas of application:
Drinking water distributionGas transport and distributionPressure sewerage systems including pump sumpsExternal sewers including plastic inspection chambers, plastic gulliesDomestic soil and waste systemsSanitary and heating systemsRainwater drainage and roof gutteringRainwater systemsRainwater infiltration unitsPE drainageElectrical systemsCable ductingIndustrial pipesGlass fibre reinforced plastic pipesDrainageLinear drainage systems