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

[email protected]


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EDITION 1: September 2009

43

MULTYRAMA GUIDA INGLESE 21-10-2009 12:57 Pagina 1

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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


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EDITION 1: September 2009

43


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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

[email protected]

Ct ing multyrama

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