Ct ing multyrama
description
Transcript of Ct ing multyrama
MULTYRAMA GUIDA INGLESE COP 21-10-2009 12:56 Pagina 1
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PIPE
IN P
E-X
/AL/
PE-X
AN
D B
RASS
-FIT
TIN
GS
VIA RANGO, 58
25065 LUMEZZANE BS ITALIA
T +39 030 8920992
F +39 030 8921739
WWW.PRANDELLI.COM
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EDITION 1: September 2009
43
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i
3
INTRODUCTION
The MULTYRAMA System is a system of pipes and fittings suitable for the
construction of water supply and heating systems.
The systems features a pipe produced with cutting edge technologies,
which combines and fully exploits the properties of plastic and metal.
In fact, this i s a multi-layer pipe, comprising two layers of crosslinked
polyethylene, bonded to an intermediate layer of aluminium.
The joints are made using mechanical compression unions, of both the
“press-fitting” and nut and ring tightening type.
I N T R O D U C T I O N
I N D E X 1. GENERAL pag. 4
2. PROPERTIES OF MULTYRAMA PIPES pag. 6
3. APPLICATION FIELDS pag. 9
4. JOINTS pag. 10
5. GUARANTEE pag. 12
6. DIMENSIONAL CHARACTERISTICS pag. 14
7. PRODUCTION pag. 15
8. CHEMICAL RESISTANCE pag. 22
9. INSTALLATION TECHNIQUE pag. 25
10. THERMIC INSULATION pag. 33
11. WARNING pag. 34
12. TESTING pag. 38
13. LOSS OF WEIGHT pag. 40
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GENERAL
54
1.
Polyethylene is composed of linear developed macro-molecules which,
subsequent to “cross-linking” are joined by transversal links.
Please note that the UNI EN ISO 15875 ruling necessitates the following
minimum values of the degree of cross-linking:
D E S C R I P T I O N O FT H E M U L T Y R A M A
S Y S T E M
CHARACTERISTICS OF CROSS-LINKEDPOLYETHYLENE
TESTMETHOD
ISO-DIS 1872
DIN 53455
DIN 53455
DIN 53457
B.S.
-
-
-
-
BS2782-202B
UNIT OFMEASURE
g/cm3
Kg/mm2
Kg/mm2
%
%
Kg/cm2
Kg/cm2
Kgm/cm2
Kgm/cm2
°C
°C-1
°C
Kcal/hm°C
ohm • cm
TESTVALUE
~ 0.95
2.0 ÷ 2.9
1.0 ÷ 1.9
170 ÷ 250
300 ÷ 500
15.000
5.000
no rottura
no rottura
-100 +110
1.5 x 10-4
135
0.38
> 1 x 1016
Density
Breaking load
Allungamento a rottura
Elasticity module
Impact resistance
Application field
Linear expansion ratio
Softening temperature
Ratio of thermal conductivity (λ)
Volume resistance
TEMPERATURETEST
-
+23°C
+100°C
+23°C
+100°C
0°C
80°C
-150°C
20°C
-
(20°C) (100°C)
-
-
20°C
C R O S S - L I N K I N G
PE-Xa Peroxide method ≥ 70%
PE-Xb Silane method ≥ 65%
PE-Xc Electronic rays method ≥ 60%
The Multyrama system is comprised of a pipe made from metal-plastic
in Pe-Xb/AI/Pe-Xb and brass mechanical joints.
Characteristics peculiar to the system are:
- internal pipe realized in cross-linked Pe-Xb polyethylene pursuant to
ruling UNI EN ISO 15875
- intermediary pipe realized in aluminium and entirely soldered along
the longitudinal generator and anchored on both the internal and
external surface area.
- external coating realized in white coloured Pe-Xb
- mechanical joint realized by way of brass connectors.
With regard to said limits higher values of mechanical, thermal and
chemical resistance are guaranteed and the internal Multyrama pipe
is rendered capable of transporting pressurized cold and hot water for
lengthy periods of time.
Non-cross-linked PE: resistant in axialmovement, less in other directions.
PE-X: resistant in equal measures ineach direction.
C a r b o n Hydrogen Links between molecules
The dimensional characteristics pertaining to Multyrama pipes are in
pursuance with the UNI 10954-1 Class 1 ruling.
external pipein PE-Xb
intermediate layer in aluminium
internal pipein PE-Xb
adhesive
adhesive
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2.
6 7
The Multyrama pipe possesses multiple characteristics which render it
unique in the realization of modern installations and technological
advancement.
Multyrama pipe has a very low chemical affinity with various substances
of an acid/basic character. It is, therefore, compatible when in contact
with materials normally used in building, such as cement or calcium
without resorting to the necessity of specific protection (with the exception
of metal joints).
In cases of transport or contact with particular substances we invite you
to verify the chemical resistance by consulting the appropriate table
on page 22 – Chapter 8.
Particular attention is given to the Multyrama system joints. In fact, in
order to avoid accidental brass/aluminium contact an o-ring is placed
at the base of the pipe adapter. In this way the diverse electro-negative
values between brass and aluminium cannot create an electro-chemical
corrosion phenomena.
R E S I S T A N C E T OE L E C T R O - C H E M I C A L
C O R R O S I O N
Resistance to cross-linked polyethylene volume (at 20°C) and metalsof common use in the hydro-thermo-sanitary field
Cross-linked polyethylene ρ20 > 1 • 1016 Ω cm
Steel ρ20 ≅ 0.10 ÷ 0.25 • 10-4 Ω cm
Pure iron ρ20 ≅ 0.0978 • 10-4 Ω cm
Industrial copper for conductors ρ20 ≅ 0.017241 • 10-4 Ω cm
Thermal conductivity of Multyrama and metals of commonuse in the hydro-thermo-sanitary field
Multyrama λ = 0,43 kcal h-1 m-1 °C-1
Steel λ = 40 ÷ 50 kcal h-1 m-1 °C-1
Iron λ = 40 ÷ 50 kcal h-1 m-1 °C-1
Copper λ = 260 ÷ 340 kcal h-1 m-1 °C-1
R E S I S T A N C E T OS T R A Y C U R R E N T S
L O W N O I S E
S A N I T A T I O N
On considering the nature of the material used in producing Multyrama,
one of its characteristics is the low ratio of thermal conductivity. It
appears evident that, to contain energy consumption, this factor
becomes important as it reduces dispersion of heat during transport of
fluid.
Moreover, it is noted that the low value of Multyrama’s ratio of thermal
conductivity lessens the formation of external surface condensation in
the pipes and prolongs the transformation times of water in drops, as
opposed to what happened when using metallic pipes.
Multyrama is a bad electrical conductor in that the metallic component
is isolated by Pe-X and because of this is becomes insensitive to stray
current phenomena. Such a phenomena, typical in places which a
high static load (scientific and industrial research laboratories) or in close
proximity to high voltage wires, generates huge problems not only in
buildings for civil habitation but also on sanitation and thermal networks
realized in metallic pipes. Please note that the pipe/flue perforation
phenomena, due to stray currents, is emphasized when the network is
earthed for electrical appliances.
Due to the material used and the ratio of acoustic isolation, noise from
installations is notably reduced as well as in the eventual presence of
water hammers.
Raw materials used in Multyrama products are completely non-toxic
and correspond to international rulings in force.
L O W T H E R M A LC O N D U C T I V I T Y
PROPERTIES OFMULTYRAMA PIPES
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2.
8 9
Multyrama pipes have been studied to withstand, with an ample safety
ratio, the stress levels present in civil and industrial installations. For
sanitation installations the pipes can function at a stable temperature
when exercising Toper = 60°C and malfunction temperature Tmal =
95°C. In heating installations the maximum temperature is Tmax = 90°C
with malfunction standing at Tmal = 100°C.
In these installations it is always best to use anti-freeze to avoid danger
of freezing (for example second homes). These conditions are foreseen
under the specific UNI 109543-1 rulings relevant to multilayers and shown
hereunder.
A P P L I C A T I O NF I E L D S
H I G H R E L I A B I L I T YO V E R T I M E
On considering the values of temperature and pressure found in hydro-
heat-sanitation installations and in virtue of the characteristics of the
components used, installations realized with Multyrama have a notable
duration over time, comparable to that of the same masonry work.
O X Y G E NP E R M E A B I L I T Y
Key:
PE-HD = high density polyethylene
PE-LD = low density polyethylene
EVOH = Materiale barriera
Al = aluminium
PE-HD
PE-LD
EVOH 4178.000
53.000
cm3 .μm/m2.d.bar
L I N E A R E X P A N S I O N The aluminium component notably reduces dilatation with respect to
materials composed only of plastic, in fact
a = 0,026 mm/m°K
0Al
Multyrama is impermeable to oxygen in that the presence of aluminium
impedes any diffused phenomena entering the pipes’ surfaces. It is
noteworthy to remember that this characteristic is particularly sought
after in central heating installations and in particular in those with
radiators.
The superficial structure of of PE-X is highly homogenous, due to the lack
of cracks, gross porosity and small fissures, typical of metallic surfaces
usually used in hydra pipe-lines, and, therefore, Multyrama has a very
low friction ratio (PE-X is physically defined as a ‘smooth body’). This
characteristic permits very swift flows of water; as a consequence there
is a low load loss as shown in diagrams on pages 38-39-40.
L O W L O A D L O S S
PROPERTIES OFMULTYRAMA PIPES 3. APPLICATION FIELDS
95
100
100
Tmal
°C
100
100
100
Tempo aTmal
h
Hot water santation sys.
Under-floor heating and radiators
at low temp.
Radiators at high temp.
Applicationfield
Class
cl
1
4
5
Poper
bar
Toper
°C
Tmaxtime
1) The system does not work for the entire life-span for a iven 50 years at the exerised Toper temperature. Thedifference in corresponding time is that attributable to the period where the temperature stands at 20° C.2)Ruling legislation in force of publication of ruling DPR n° 412 dated 26.08.1993 - see Appendix D on containmentof energy consumption which foresees a temperature on exercising Topar = 48 °C (+5°C) for the centralizeddistribution hot water sanitary fixtures.3)The exercise period referring to a life span of 50 years take into consideration usage at 40°C for 20 years addedto a usage at 60°C for 25 years.4) IThe exercise period referring to a life span of 50 years takes into consideration usage at 60°C for 25 years addedto a usage at 80°C for 10 years.5)Class 1 can also be used in application of classes 4 and 5. Class 5 can also be used in application of class 4.
Toper Timeyear
10
6
6
2)60
40
plus
60
60
plus
80
3)
4)
80
70
90
49
20
25
25
10
1) 1)
Tmax
°C
1
2,5
1
Index of oxygen permeability
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FITTINGS4.
10 11
The Multyrama fitting is realized in brass and in some cases from PPSU.
The pipe-fititng hold is realized through compression and a consequential
set of the pipe on the joint adapter. In connection with the means
adopted in realizing such compression two difference type of joints can
be identified:
- “press-fitting” type
- “grip” type
Both cases are mechanical joints
Press-fitting joint
Compression is obtained by compressing a metal bush using the
appropriate tool. Setting of the bush, together with the shape of the
joint adapter, in turn permit the interposed pipe to be set thereby assuring
a perfect mechanical and hydraulic hold. The two o-ring, positioned
within the adapter, contribute towards improving the hydraulic hold
and to re-clean the pipe’s internal surface on the one hand and on the
other to ensure that the ‘beat’ part of the pipe whereby the aluminium
does not come into contact with the joint body, thereby eliminating risk
of electro-chemical corrosion and to allow pre-assembly of the metallic
bush.
“Grip” joint
Compression and consequential setting of the pipe with the joint adapter
is obtained by screwing a block nut on the joint; such a movement
tightens a metallic ogive on the pipe. The adapter is placed at the part
of the taper shank equipped with an o-ring for insertion into the joint
body and at the other part by a ribbed section to which the pipe is
assembled. This area is further linked by two o-rings destined to improve
hydraulic technique and to ensure cleaning of the pipe’s internal surface,
while in the ‘beat’ area a plastic-made disc is interposed which ensures
non-contact between aluminium and brass components.
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Multyrama products and its components undergo strict quality controls.
The productive cycle foresees daily physic-chemical tests and continuous
controls on dimensions and surfaces as well as verification of the walls’
integrity. Consequently, Multyrama employed in hydro-thermal-sanitary
installations and for all other types of installations compatible with the
product’s technical characteristics and in compliance with the installation
instructions set out in the present publication, we give the following
GUARANTEE, covered by the policy stipulated with the Insurance
Company.
1. The company Prandelli, Multyrama supplier, will provide compensation
through cover of insurance stipulated with the Insurance Company, all
damage caused to persons or things, caused through breakage of pipe
and joints ascribable to evident manufacturing defects, up to a maximum
of 500,000 Euro for a period of 10 YEARS from the data of installation of
pipes.
2. Conditions regulating such GUARANTEES are:
a. the pipe must be installed in accordance with the
installation instructions supplied by us, subject to possible
wrong or mis-handled controls, happening during the
period following production and due to accidental
causes.
b. Conditions (pressure and temperature) must come within
the technical limits set out in the latest Multyrama Guide
publication.
c. The product must carry the trade-name Multyrama.
C E R T I F I C A T EO F G U A R A N T E E
5.
12 13
CERTIFICATE OFGUARANTEEE
3. The GUARANTEE CARRIES NO VALIDITY in the following cases:
a. Non-observation of installation instructions recommended
by us
b. Pipe connection and joints by way of heating sources
with temperature and pressure limits, even if accidental,
non compatible with the pipe’s characteristics.
c. Use of materials manifestly unsuitable (obsolete, old pipes,
scratched, torn pipes, etc.)
d. Use of one or more components of diverse provenance
from ours in realizing installation.c)
4. INSTRUCTIONS FOR THE REQUEST OF INTERVENTION UNDER GUARANTEE
In the eventuality of a Multyrama break imputable exclusively to evident
manufacturing defects, it is necessary to submit a registered letter, with
copy to the area representative, containing:
- place and date of installation
- data and identification mark of pipe
- information on the conditions (pressure and temperature)
- sample of pipe or joint where breakage has occurred
- name and address of installer of installation
On receipt of such, within a reasonable period, we will send a technician
to verify the causes of damage.
Where breakage falls within the conditions of GUARANTEE we will pass
details to the Insurance Company who will provide compensation for
damages, after ascertainment of causes and entity.
Prandelli S.p.A.
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6.
14 15
DIMENSIONALCHARACTERISTICS
The technical characteristics of the Multyrama pipe, together with the
particular technique used for joints, which we will examine later, renders
the system suitable in resolving all situations where a technically, evolved
product is desired. Also because the system carries with it a dimensional,
specific range which includes fundamental diameters for the distribution
of sanitary systems and/or for heating in different types of installations.
The entire dimensional range is capable of satisfying that required by
the UNI 10954-1 as shown in Prospectus 1. In particular all dimensions
having a series 26<S<-42.8 belong to Class 1 with Toper 60° and PD 10
bar. Those with a value inferior to S have as an equal DN diameter a
larger thickness of eAll aluminium and, therefore, they give a larger
resistance or a higher safety efficiency if used under the conditions
foreseen by Class 1. With regard to this we have observed that in some
European countries the application field for sanitary installations foresees
Class 2, as pursuant to the UNI ISO 15875-2 for the Pe-X ruling.
PIPE CUTTER TOOL
7. WORKINGTECHNIQUE
P I P E C U T T E RT O O L
We advise the use of these shears to obtain a net and mark free cut on
all Multyrama pipes in order to realize a secure joint.
D I M E N S I O N A LR A N G E
The necessary equipment
for Multyrama
components is
constituted by the
following elements:
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WORKINGTECHNIQUE
1716
7.
C A L I B R A T O RT O O L
CALIBRATOR
ELECTRIC PRESS
- calibrator to give the pipe its original
cylindrical form and to ease insertion
onto joint adapter
- Electric or battery run press with
pliers for assembling joints
- Manual press: up to 26 diameter.
MANUAL PRESS
E L E C T R I C O RB A T T E R Y R U N P R E S S
M A N U A L P R E S S
7.
R E A L I Z A T I O NO F J O I N T
Procedural phases for jointing are as follows:
1. Preparation of pipe
Cut the tube perpendicularly on its axis, thereby avoiding partial linking
of joint.
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Once verified that there are no traces of residue on the joints’ O-ring,
proceed to inserting the pipe to the adapter until the appropriate
inspection holes carried out on the metal bush, in the case of Press-
Fitting, have appeared: for the “grip” type the pipe must be pushed
into the adapter as far as the ‘beat’.
Before executing pressure please control that the diverse components
pertaining to the joint, such as the o-rings and the metal bush are
correctly positioned, that the pipe is securely fixed to the adapter, that
it is in ‘beat’ and that the pliers press, besides being of the type and
dimensions requested, is on the side placed next to the body joint.
7.
18 19
WORKINGTECHNIQUE
After calibration, and before
assembling the joint, please
verify that the pipe’s interior is
without residue – such as
residual burr or dirt in general.
This consists in calibrating the
newly cut pipe, using the
appropriate utensil which is
inserted in the pipe, turning it
clockwise (photo A) until the
bell mouth area is reached
(photo B).
C A L I B R A T I O N
A S S E M B L I N G O FJ O I N T S
W A R N I N G
PREPARING THE FITTING COMPRESSION PROCEDURE
COMPRESSED FITTING MECHANICAL JOINT
Moreover, the pipe-cutter’s blade must be kept in perfect condition so
as to avoid possible “tears” on Pe-X pipes which could compromise the
intervention. In this case it is necessary to replace the pipe-cutter’s
blade and repeat intervention.
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7.
20 21
WORKINGTECHNIQUE
In virtue of Multyrama’s technical-construction characteristics, manual
curvature of pipes with diameters of 20 mm is rendered extremely easy
with or without the use of appropriate curvature springs. For those with
larger dimensions, the use of a pipe bender is recommended and in the
case where advised values and shown on the chart are not applicable,
the use of joints is indispensable. The following curvature radius are to
be respected:
d = external diameter of pipe
We notice that in aiming to ensure reliability over a period of time of the
pipe-joint link, the length of the pipe to be linked must always be
rectilinear and such characteristic must also be present in length
immediately prior to the joint.
C U R V A T U R E O FP I P E S
DIMENSIONS OF
PIPE mm
14 X 2
16 X 2
16 X 2.25
18 X 2
20 X 2
20 X 2.5
26 X 3
32 X 3
40 X 3.5
50 X 4.0
63 X 4.5
CURVATURE RADIUSS/CURVATURE
5.0 X d
5.0 X d
5.0 X d
5.0 X d
5.0 X d
5.0 X d
-
-
-
-
-
CURVATURE RADIUSWITH SPRING
2.5 X d
2.5 X d
2.0 X d
2.5 X d
3.0 X d
3.0 X d
-
-
-
-
-
CURVATURE RADIUSWITH PIPE BENDER
-
-
-
-
-
-
5.0 X d
5.0 X d
≥ 8.0 x d
≥ 8.0 x d
≥ 10.0 x d
The connection by way of press-fitting or “grip” joints allows recovery of
the body joint in the case where the intervention has been incorrectly
carried out or where modifications to a previous installation have to be
realized.
Procedure:
- if intervention on an existing installation is necessary, separate
the joint to be recovered from the rest of the pipe;
- by using an industrial dryer proceed to heating of the bush press
to be separated. When the temperature of the pipe causes
softening of the Pe-X layer, either the pipe or the bush can be
easily separated from the body joint.
- Once separated the body joint can be re-used for other links
after accurate cleaning of the adapter and substitution of the
o-rings;
- the bush, together with the connected length of pipe must,
instead, be eliminated in that the previous pressing phase
provoked such deformation as to impede all subsequent re-use.
- for “grip” joints the block nut must be unscrewed thereby enabling
removal of pipe together with adapter with taper shank. Beside
the length of tube it is advisable to also replace the adapter
and the pipe-wrench ogive.
R E C O V E Y O FJ O I N T
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9.
26 27
pipeMultyrama
fixedpoint
fixedpoint
joint
wall fixture
F i x e d p o i n t s
E x a m p l e o f f i x e d p o i n t
lavabo bidet
W.C.
shower
T H E R M A LE X P A N S I O N
2. Installation using joints (with T-joints and possibly 90° elbows).
All materials including those which constitute Multyrama pipe, if submittedto temperature variation expand or contract in proportion to theirexpansion a ratio. It follows that if the pipe is installed without anexpander, it is subject to a variation of length
ΔL = a • L • ΔT where:
ΔL = variation of lenght of pipe in mm
a = linear expansion ratio in mm/m*K equal to 0.026
L = lenght of pipe free from constraints in mm
ΔT = difference between installation temperature and those exercised
in K (maximum or minimum)
On determining expansion it is necessary to begin the necessarytechniques in such as way as to prevent that such a phenomenon doesnot provoke problems to the pipe itself. For this is it necessary to fit theinstallation with fixed points and slip points. Indicated with this nameare the constraints which integrally render the pipe to the structure ofthe buildings, by totally or only partially impeding movementconsequential to thermal expansion.
Their function is to obstruct movement of pipes and for this reason a
rigid connection between installation on the one hand and the building
work on the other hand must be made.
This is realized through use of rigid collars made from a pressed element,
usually metal, covered in rubber material on the part of the pipe and
by a component for fixing to the wall on the opposite side.
Obviously the part in rubber (or in similar material) functions as a protective
shield against dangerous damage to the pipe’s surface and to abate
vibrations.
The fixed points are placed, usually, in correspondence with the
installation’s directional changes (branches (arms), elbows, etc.) to
impede expansion occurring in those specific points.
It is, however, a good idea to always place the fixed point close to a
pipe connection, made with any type of joint. It is easy to understand,
therefore, that the presence of fixed points limits the length of the
restrained pipe to enable dilator L. to lessen, as a consequence, the
relevant ΔL value.
F I X E D P O I N T S ,S L I P P O I N T S A N DE X P A N S I O N A R M
INSTALLATIONTECHNIQUE
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Slip points permit axial flow (in both ways) in the pipe. Because of this
they must be placed faraway from connections with joints, on a free
area of the pipe’s surface. The collar which functions as the slip point
must in no way present parts which could damage the pipe’s external
surface area.
The slip points also function as a support and guarantee (if positioned
in sufficient numbers) maintenance of the installation’s geometrical
rectilinear in the presence of thermal stress.
Generally, positioning intervals are:
d. 16 and 20 = L 100 cm
d. 26 = L 150 cm
d. 32/40/50 = L 200 cm
d 63 = L 250 cm
In some cases expansion is compensated either through directional
changes (expansion arm) or through curves (omega). In these cases it
is important to take into account the pipe’s characteristics and the
correct positioning of the fixed points by way of the following forumla:
LS = F • √ D •ΔL whereby
LS = llenght of expansion arm (mm)
F = material constant (for Multyrama 30)
D = diameter of pipe (mm)
ΔL = variation in lenght of pipe (mm)
Calculation of expansion for Multyrama pipe is carried out by applying
the following formula:
ΔL = α • L • ΔT where:
ΔL = expansion of pipe mm
α = ratio of linear expansion of material mm/m°C:
MULTYRAMA = 0.026 mm/m°C
L = lenght of pipe free to expand m
ΔT = difference between the maximum temperature exercised and
that of the ambience at time of mounting °C
One must calculate the ΔL expansion of a lenght of MULTYRAMA
pipe ø 20X2.5 at 8 m. lenght.
C A L C U L A T I O NO F E X P A N S I O N
E x a m p l e :
T amb = 20°C (ambience temperature);
T max = 70°C (maximum temperature exercised);
L = 8 m;
ΔL = α • L • ΔT = 0.026 • 8 • (70-20) = 10.4 mm
To graphically calculate expansions of MULTYRAMA, the following diagram
can be used:
Once the entity of the expansion has been determined it is necessary,
if the installation has been mounted externally, to use fixed points, slip
points and, possibly, expansion arms to impede damage to pipe following
variations in length.
9. INSTALLATIONTECHNIQUE
28 29
pipeMultyrama
slip point
wall fixturepermitted axial flow
S l i p p o i n t s
E x a m p l e o f s l i p p o i n t s
E x p a n s i o n a r m
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E X A M P L E
C O M P E N S A T I O NU S I N G E X P A N S I O N
A R M S
By using such a technique installation is realized by conferring to the lay
out a geometry which consents absorption of expansion. For this aim
are realized, in correspondence with directional changes (elbows, T’s),
expansions arms whereby the pipe has the possibility to expand during
the presence of thermal stress.
Calculation of these expansion arms is carried out by way of the following
formula:
LS = F • √ D • ΔL wherein:
LS = lenght of expnasion arm (mm)
F = material constant (for multi layers = 30)
D = external diameter of pipe (mm)
ΔL = variation of lenght of pipe (mm)
D = 20 mm
L = 8 m
ΔT = 50°C
from the preceding example is obtained:
ΔL = 10.4 mm of which
LS = 30 √ 20•10.4 = 433 mm
9.
30 31
INSTALLATIONTECHNIQUE
FP
E x a m p l e o fd i l a t i n g a r m
LP
FP
L ΔL
LS
ΔL L
FP
ΔLL
FP
LS LS
FP
ΔLL
FP
LS
FP LP
Shown below are a few examples of correct installation for external
Multyrama systems using diverse techniques adopted to take into
account thermal expansion of material.
G R A P H I C A LE X A M P L E S
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9.
28
INSTALLATIONTECHINIQUE
32
Fixed point at the base of
column area
Fixed point in the column’s
intermediary
Absorption of lenght with compensation ring in a direct
conductor
THERMALINSULATION
External diameter of pipes
10.
33
Ruling 10/91, relevant to containment of energy consumption and the
legislative decree DPR 412/93 imposes that pipes used in the realization
of thermal systems be correctly covered by insulating material. Obviously,
in the case of thermal installations and/or hot water sanitary plumbing
systems insulation has the aim to avoid dispersion, while for air conditioning,
besides avoiding increase in temperature of channelled fluid, impedes
formation of condensation on the pipe’s surface due to humidity in the
air. At an equal thickness of insulation, energy saving will, as a
consequence, be far higher the more significant the insulating power
of the insulation and just as less as the surface area of thermal exchange.
The Legislative Decree 412/93 fixes the minimum thickness values of the
insulation in function with its thermal conductivity and the diameter of
the pipe to be insulated; the Decree states, moreover, that the thicknesses
given in the following table be applied :
CASE A equally, for systems placed in unheated localities (eg.
Garages, cellars, etc.)
CASE B multiplied for a reduced ratio of 0,5 per systems placed
internally in walls of a building’s perimeter.
CASE C multiplied for a reduced ratio of 0,3 for systems placed
in non-external structures, nor adjacent to unheated localities.
T h e r m a l i n s u l a t i o nf o r c e n t r a l h e a t i n g ,a i r -condi t ion ing and
s a n i t a r y p l u m b i n gi n s t a l l a t i o n s
26
29
31
34
37
40
43
46
50
54
58
from 40 to 59
Thermalconductivity of
insulationw / m ° K
0,030
0,032
0,034
0,036
0,038
0,040
0,042
0,044
0,046
0,048
0,050
<20
13
14
15
17
18
20
22
24
26
28
30
from 20 to 39
19
21
23
25
28
30
32
35
38
41
44
33
36
39
43
46
50
54
58
62
66
71
from 60 to 79
37
40
44
47
51
55
59
63
68
72
77
from 80 to 99
40
44
48
52
56
60
64
69
74
79
84
>100
The pipes supplied by Prandelli with insulation foresee the use of Expanded
Polyethylene with closed cells and 6 and 10 mm thickness with external
Polyethylene film as a barrier against humidity.
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The use of Multyrama in realization of the hydra-thermo-sanitary
installations offers numerous advantages already previously mentioned
in the present Guide. For full benefit of such advantages it is however,
indispensable to fully understand each aspect relating to the product
to be used. Below is a series of important suggestions, indispensible for
the correct use of Multyrama pipes.
Use of Multyrama in the ambit of work conditions creates no problems
whatsoever to material. To the contrary exceeding limited conditions
of use can prejudice the product’s resistance. It is, therefore, indispensable
to take every precaution to avoid this happening, thereby safeguarding
not only the system’s integrity but also that of the user.
Multyrama must never be installed or stored in within an area of ultra
violet rays. Exposure to rays provokes aging of material with consequential
loss of initial chemical-physical characteristics.
It is necessary to ensure that the pipe’s surface does not come into
contact with sharp edges which could damage it by causing cuts and
scratches. This precaution must also be taken into consideration during
installation work as well as during storage. Because of this, use of pipes
showing signs of accidental scratches or cuts must be avoided.
11. WARNING
34 35
P R E M I S E
C O N D I T I O N S
U L T R A V I O L E TR A Y S
C O N T A C T W I T HS H A R P O B J E C T S
When using transition joints with female thread application of coupled
elevated tightening must be avoided in using joints with male thread.
Moreover, we recommend not to place an excessive quantity of hemp
between the parts to be assembled, nor to use alternative materials to
hemp such as Teflon or similar.
One must also make sure that the male part has a sufficient length to
enable coupling; generally, it is auspicious that at least one thread
remains outside coupling.
In the case where the installation requirements render necessary coupling
of a joint to a pipe or a joint in iron the use of Multyrama joint system
with male thread to create such a link is advisable.
It must be taken into account that if the transported fluid is water, the
change of status to temperature is as follows:
T ≤ 0°C
liquid (water) solid (ice)
accompanied by an increase in volume which brings a major stress to
the pipe. Such stress can reach values which are incompatible with the
PE-Xc characteristics.
For this reason it is, therefore, necessary to avoid creation of the afore-
mentioned phenomenon, by foreseeing :
1. for central heating installations
- emptying if inactive
- added anti-freeze additives
(as in the case of air-conditioning installations)
- opportune insulation
J O I N T S W I T HF E M A L E T H R E A D
I N S T A L L A T I O N S A TA M B I E N C E
T E M P E R A T U R E ≤ 0 ° C
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2. for sanitary installations
In this case, hygiene requirements exclude all possibility of lowering the
ice level by way of added additives and must, as a consequence,
prevalently operate on the degree of insulation of the pipes and, for
the more exposed tracks, create recycling rings.
N.B. Very often the pipes’ insulation is erroneously interpreted as being
a solution of certain reliability over a period of time, suitable to ward off
danger of reaching freezing point.
It is also opportune to take into account that insulation represents a
barrier whose aim is essentially to delay creation of such a phenomenon
and certainly not to exclude it entirely.
Pipe bending must be avoided when assembly has been realized, by
placing leverage on the joint, as in that way causing stress in cutting
the pipe.
Curvature should always precede assembly and the pipe tract,
immediately before connection, must be aligned with the joint’s axel.
11. WARNING
36 37
C U R V A T U R E I NP R O X I M I T Y J O I N T
12. TESTING OF INSTALLATION
P R O C E D U R E Testing of installation (pursuant to ENV12108:2001 ruling) is fundamental
in securing a good outcome of the work carried out. In fact, this is done
to ascertain that, for whatever cause, the installation installed bears no
leak points.
The undertakings to be carried out are as follows :
- Sight inspection of pipes and joints
In this way it can be verified that installation of pipes and connecters
have been installed correctly and that there are no parts which have
been accidentally damaged by sharp points.
- Hydraulic proof test
This is carried out on installations still directly accessible by filling the same
with water at room temperature and carefully releasing the air present.
1. Once filled and with closed installation, place the same under pressure
for a 30 minute proof test (if a decrease in pressure is registered due to
settling of pipes, reset pressure at 10 minute intervals).
2. Read the pressure value by using the equipment with 0,1 bar precision,
after 30 minutes read the pressure value after a further 30 minutes: if the
variation is inferior to 0.6 bar the installation does not present leaks.
Continue the test for a further 2 hours.
3. Read the pressure value after 2 hours, if the pressure diminishes beyond
0.2 bar there is a leak in the system, otherwise the test is positive.
For installation tracks it is possible to omit interventions stated under point
3.
PROOF TEST = MAXIMUM WORKING PRESSURE x 1,5
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12.
38 39
TESTING OF INSTALLATION
DIAGRAMS OF LOSS OF WEIGHT
To use the monogram it is necessary to fix at least two sizes, of which one i the dimension of the pipe and the
seocnd which, generally, is the weight or the velocity.
Water temperature at 20° C
Pipe: ø 16 x 2,25
ø int. = mm 11,5 (point A)
velocity 1,5 m/s (point B)
Connecting with a line points A and B points C and D are identified which indicate respectively a loss of weight
J = 0,26 m/m and a weight Q = 0,17 l/s.
An appropriate use of Mulltyrama and its joints, together with a careful
test, will avoid any problems including those in tracks or installations
destined in conveying hot water.
N.B. On completing the test, the installation’s pressure proof test is
removed; sometimes it is opportune to totally empty the installation,
especially if the same is realized in areas subject to reaching temperature
near or inferior to 0°C.
Such a warning has the aim of avoiding possible, unexpected damage
and due to formation of ice, on installations which ones presumes to
having been already tested and, therefore, absent of any form of
inconvenience.
13. LOSS OF WEIGHT
VELOCITY(m/s)
LOSS OF WEIGHT(m/m)
INTERNAL DIAMETER(mm)
LOAD(l/s)
WATER AT 20 °C
B
C
A
D
12.
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13.
40 41
WATER AT 60°C
VELOCITY(m/s)
LOSS OF WEIGHT(m/m)
INTERNAL DIAMETER(mm)
LOAD(l/s)
WATER AT 60 °C
n NOTES
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n
42
NOTES
MULTYRAMA GUIDA INGLESE COP 21-10-2009 12:56 Pagina 2
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EDITION 1: September 2009
43
MULTYRAMA GUIDA INGLESE COP 21-10-2009 12:56 Pagina 1
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PIPE
IN P
E-X
/AL/
PE-X
AN
D B
RASS
-FIT
TIN
GS
VIA RANGO, 58
25065 LUMEZZANE BS ITALIA
T +39 030 8920992
F +39 030 8921739
WWW.PRANDELLI.COM