Page 1

VIA RANGO, 58 25065 LUMEZZANE BS ITALIA T +39 030 8920992 F +39 030 8921739 WWW.PRANDELLI.COM PRANDELLI@PRANDELLI.COM

Colori compositi

PIPE IN PE-X/AL/PE-X AND BRASS-FITTINGS

MULTYRAMA GUIDA INGLESE COP 21-10-2009 12:56 Pagina 1


MULTYRAMA GUIDA INGLESE COP 21-10-2009 12:56 Pagina 2

EDITION 1: September 2009

43

Colori compositi


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

i

INTRODUCTION

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.

INDEX

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

3

Colori compositi


MULTYRAMA GUIDA INGLESE 21-10-2009 12:57 Pagina 2

1.

GENERAL

DESCRIPTION OF THE MULTYRAMA SYSTEM

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

With regard to said limits higher values of mechanical, thermal and

ruling UNI EN ISO 15875

chemical resistance are guaranteed and the internal Multyrama pipe

- intermediary pipe realized in aluminium and entirely soldered along

is rendered capable of transporting pressurized cold and hot water for

the longitudinal generator and anchored on both the internal and

lengthy periods of time.

external surface area. - external coating realized in white coloured Pe-Xb - mechanical joint realized by way of brass connectors.

CHARACTERISTICS OF CROSS-LINKED POLYETHYLENE Density

TEST METHOD

TEMPERATURE TEST

UNIT OF MEASURE

TEST VALUE

ISO-DIS 1872

-

g/cm3

~ 0.95

DIN 53455

+23°C

Kg/mm

+100°C

Kg/mm2

1.0 ÷ 1.9

+23°C

%

170 ÷ 250

+100°C

%

300 ÷ 500

0°C

Kg/cm2

15.000

80°C

Kg/cm2

5.000

-150°C

Kgm/cm2

no rottura

20°C

Kgm/cm2

no rottura

Application field

-

-

°C

-100 +110

Linear expansion ratio

-

(20°C) (100°C)

°C-1

1.5 x 10-4

Softening temperature

-

-

°C

135

Ratio of thermal conductivity (λ)

-

-

Kcal/hm°C

0.38

BS2782-202B

20°C

ohm • cm

> 1 x 1016

Breaking load

DIN 53455

Allungamento a rottura

DIN 53457

Elasticity module

B.S.

Impact resistance

Volume resistance

CROSS-LINKING

2

2.0 ÷ 2.9 Non-cross-linked PE: resistant in axial movement, less in other directions.

PE-X: resistant in equal measures in each direction. Carbon

Hydrogen Links between molecules

The dimensional characteristics pertaining to Multyrama pipes are in pursuance with the UNI 10954-1 Class 1 ruling.

external pipe in PE-Xb

Polyethylene is composed of linear developed macro-molecules which, intermediate layer in aluminium

subsequent to “cross-linking” are joined by transversal links. Please note that the UNI EN ISO 15875 ruling necessitates the following

internal pipe in PE-Xb

minimum values of the degree of cross-linking:

adhesive

PE-Xa

Peroxide method

≥ 70%

PE-Xb

Silane method

≥ 65%

PE-Xc

Electronic rays method

≥ 60%

4

Colori compositi

adhesive

5


MULTYRAMA GUIDA INGLESE 21-10-2009 12:57 Pagina 3

2.

PROPERTIES OF MULTYRAMA PIPES

The Multyrama pipe possesses multiple characteristics which render it unique in the realization of modern installations and technological advancement.

RESISTANCE TO ELECTRO-CHEMICAL CORROSION

Multyrama pipe has a very low chemical affinity with various substances

On considering the nature of the material used in producing Multyrama,

of an acid/basic character. It is, therefore, compatible when in contact

one of its characteristics is the low ratio of thermal conductivity. It

with materials normally used in building, such as cement or calcium

appears evident that, to contain energy consumption, this factor

without resorting to the necessity of specific protection (with the exception

becomes important as it reduces dispersion of heat during transport of

of metal joints).

fluid.

In cases of transport or contact with particular substances we invite you

Moreover, it is noted that the low value of Multyrama’s ratio of thermal

to verify the chemical resistance by consulting the appropriate table

conductivity lessens the formation of external surface condensation in

on page 22 – Chapter 8.

the pipes and prolongs the transformation times of water in drops, as opposed to what happened when using metallic pipes.

Resistance to cross-linked polyethylene volume (at 20°C) and metals of common use in the hydro-thermo-sanitary field Cross-linked polyethylene Steel Pure iron Industrial copper for conductors

ρ20 > 1 • 1016 ρ20 ≅ 0.10 ÷ 0.25 • 10-4 ρ20 ≅ 0.0978 • 10-4 ρ20 ≅ 0.017241 • 10-4

Ω cm

RESISTANCE TO STRAY CURRENTS

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

Ω cm Ω cm

high static load (scientific and industrial research laboratories) or in close

Ω cm

proximity to high voltage wires, generates huge problems not only in buildings for civil habitation but also on sanitation and thermal networks

Particular attention is given to the Multyrama system joints. In fact, in

realized in metallic pipes. Please note that the pipe/flue perforation

order to avoid accidental brass/aluminium contact an o-ring is placed

phenomena, due to stray currents, is emphasized when the network is

at the base of the pipe adapter. In this way the diverse electro-negative

earthed for electrical appliances.

values between brass and aluminium cannot create an electro-chemical corrosion phenomena.

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

LOW THERMAL CONDUCTIVITY

Thermal conductivity of Multyrama and metals of common use 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

6

Colori compositi

LOW NOISE

water hammers.

SANITATION

Raw materials used in Multyrama products are completely non-toxic and correspond to international rulings in force.

7


MULTYRAMA GUIDA INGLESE 21-10-2009 12:57 Pagina 4

2.

3.

PROPERTIES OF MULTYRAMA PIPES

LOW LOAD LOSS

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

APPLICATION FIELDS

APPLICATION FIELDS

Multyrama pipes have been studied to withstand, with an ample safety ratio, the stress levels present in civil and industrial installations. For

usually used in hydra pipe-lines, and, therefore, Multyrama has a very

sanitation installations the pipes can function at a stable temperature

low friction ratio (PE-X is physically defined as a ‘smooth body’). This

when exercising Toper = 60°C and malfunction temperature Tmal =

characteristic permits very swift flows of water; as a consequence there

95°C. In heating installations the maximum temperature is Tmax = 90°C

is a low load loss as shown in diagrams on pages 38-39-40.

with malfunction standing at Tmal = 100°C. In these installations it is always best to use anti-freeze to avoid danger

OXYGEN PERMEABILITY

of freezing (for example second homes). These conditions are foreseen

Multyrama is impermeable to oxygen in that the presence of aluminium

under the specific UNI 109543-1 rulings relevant to multilayers and shown

impedes any diffused phenomena entering the pipes’ surfaces. It is

hereunder.

noteworthy to remember that this characteristic is particularly sought after in central heating installations and in particular in those with radiators.

53.000

PE-HD

PE-LD 178.000 4

EVOH Al

Poper

Toper

cl

bar

°C

1

10

60 2)

Toper Time Tmax year 1) °C

49

Tmax time

Tmal

Tempo a Tmal

°C

h

1)

80

1

95

100

70

2,5

100

100

90

1

100

100

Application field

Hot water santation sys.

Key: PE-HD = high density polyethylene PE-LD = low density polyethylene EVOH = Materiale barriera

0

Class

40 4

6

20

3)

plus 25

60

Al = aluminium

Under-floor heating and radiators at low temp.

cm3 .μm/m2.d.bar

Index of oxygen permeability 60

LINEAR EXPANSION

The aluminium component notably reduces dilatation with respect to materials composed only of plastic, in fact

a = 0,026 mm/m°K

HIGH RELIABILITY OVER TIME

On considering the values of temperature and pressure found in hydroheat-sanitation installations and in virtue of the characteristics of the

5

6

25 4)

plus

1) The system does not work for the entire life-span for a iven 50 years at the exerised Toper temperature. The difference 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 containment of energy consumption which foresees a temperature on exercising Topar = 48 °C (+5°C) for the centralized distribution 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 added to 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 added to 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.

components used, installations realized with Multyrama have a notable duration over time, comparable to that of the same masonry work.

8

Colori compositi

Radiators at high temp.

10

80

9


MULTYRAMA GUIDA INGLESE 21-10-2009 12:57 Pagina 5

4.

FITTINGS

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

“Grip” joint

adopted in realizing such compression two difference type of joints can be identified:

Compression and consequential setting of the pipe with the joint adapter

-

“press-fitting” type

-

“grip” type

Both cases are mechanical joints

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

Press-fitting joint

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,

Compression is obtained by compressing a metal bush using the appropriate tool. Setting of the bush, together with the shape of the

while in the ‘beat’ area a plastic-made disc is interposed which ensures non-contact between aluminium and brass components.

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.

10

Colori compositi

11


MULTYRAMA GUIDA INGLESE 21-10-2009 12:57 Pagina 6

5.

CERTIFICATE OF GUARANTEEE

CERTIFICATE OF GUARANTEE

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

3. The GUARANTEE CARRIES NO VALIDITY in the following cases:

installations and for all other types of installations compatible with the

a.

product’s technical characteristics and in compliance with the installation instructions set out in the present publication, we give the following

Non-observation of installation instructions recommended by us

b.

Pipe connection and joints by way of heating sources

GUARANTEE, covered by the policy stipulated with the Insurance

with temperature and pressure limits, even if accidental,

Company.

non compatible with the pipe’s characteristics. c.

1. The company Prandelli, Multyrama supplier, will provide compensation through cover of insurance stipulated with the Insurance Company, all

Use of materials manifestly unsuitable (obsolete, old pipes, scratched, torn pipes, etc.)

d.

damage caused to persons or things, caused through breakage of pipe

Use of one or more components of diverse provenance from ours in realizing installation.c)

and joints ascribable to evident manufacturing defects, up to a maximum

4. INSTRUCTIONS FOR THE REQUEST OF INTERVENTION UNDER GUARANTEE

of 500,000 Euro for a period of 10 YEARS from the data of installation of

In the eventuality of a Multyrama break imputable exclusively to evident

pipes.

manufacturing defects, it is necessary to submit a registered letter, with copy to the area representative, containing:

2. Conditions regulating such GUARANTEES are: a.

b.

c.

the pipe must be installed in accordance with the

-

place and date of installation

installation instructions supplied by us, subject to possible

-

data and identification mark of pipe

wrong or mis-handled controls, happening during the

-

information on the conditions (pressure and temperature)

period following production and due to accidental

-

sample of pipe or joint where breakage has occurred

causes.

-

name and address of installer of installation

Conditions (pressure and temperature) must come within

On receipt of such, within a reasonable period, we will send a technician

the technical limits set out in the latest Multyrama Guide

to verify the causes of damage.

publication.

Where breakage falls within the conditions of GUARANTEE we will pass

The product must carry the trade-name Multyrama.

details to the Insurance Company who will provide compensation for damages, after ascertainment of causes and entity. Prandelli S.p.A.

12

Colori compositi

13


MULTYRAMA GUIDA INGLESE 21-10-2009 12:57 Pagina 7

6.

DIMENSIONAL CHARACTERISTICS

DIMENSIONAL RANGE

The technical characteristics of the Multyrama pipe, together with the particular technique used for joints, which we will examine later, renders

7.

WORKING TECHNIQUE

PIPE CUTTER TOOL

The necessary equipment for Multyrama

the system suitable in resolving all situations where a technically, evolved

components is

product is desired. Also because the system carries with it a dimensional,

constituted by the

specific range which includes fundamental diameters for the distribution

following elements:

of sanitary systems and/or for heating in different types of installations. PIPE CUTTER TOOL

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.

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 60째 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.

14

Colori compositi

15


MULTYRAMA GUIDA INGLESE 21-10-2009 12:57 Pagina 8

7.

WORKING TECHNIQUE

CALIBRATOR TOOL

- calibrator to give the pipe its original cylindrical form and to ease insertion onto joint adapter

REALIZATION OF JOINT

Procedural phases for jointing are as follows: 1.

Preparation of pipe

Cut the tube perpendicularly on its axis, thereby avoiding partial linking of joint.

CALIBRATOR

ELECTRIC OR BATTERY RUN PRESS

- Electric or battery run press with pliers for assembling joints

ELECTRIC PRESS

MANUAL PRESS - Manual press: up to 26 diameter.

MANUAL PRESS

16

Colori compositi

17


MULTYRAMA GUIDA INGLESE 21-10-2009 12:57 Pagina 9

7.

WORKING TECHNIQUE

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

ASSEMBLING OF JOINTS

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

intervention. In this case it is necessary to replace the pipe-cutter’s

inspection holes carried out on the metal bush, in the case of Press-

blade and repeat intervention.

Fitting, have appeared: for the “grip” type the pipe must be pushed into the adapter as far as the ‘beat’.

CALIBRATION

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

PREPARING THE FITTING

COMPRESSION PROCEDURE

COMPRESSED FITTING

MECHANICAL JOINT

bell mouth area is reached (photo B).

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.

WARNING 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.

18

Colori compositi

19


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

7.

WORKING TECHNIQUE

CURVATURE OF PIPES

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,

RECOVEY OF JOINT

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

the use of joints is indispensable. The following curvature radius are to

carried out or where modifications to a previous installation have to be

be respected:

realized. Procedure:

DIMENSIONS OF

-

if intervention on an existing installation is necessary, separate

CURVATURE RADIUS S/CURVATURE

CURVATURE RADIUS WITH SPRING

CURVATURE RADIUS WITH PIPE BENDER

14 X 2

5.0 X d

2.5 X d

-

16 X 2

5.0 X d

2.5 X d

-

16 X 2.25

5.0 X d

2.0 X d

-

to be separated. When the temperature of the pipe causes

18 X 2

5.0 X d

2.5 X d

-

20 X 2

5.0 X d

3.0 X d

-

softening of the Pe-X layer, either the pipe or the bush can be

20 X 2.5

5.0 X d

3.0 X d

-

26 X 3

-

-

5.0 X d

32 X 3

-

-

5.0 X d

40 X 3.5

-

-

≥ 8.0 x d

50 X 4.0

-

-

≥ 8.0 x d

63 X 4.5

-

-

≥ 10.0 x d

PIPE mm

the joint to be recovered from the rest of the pipe; -

by using an industrial dryer proceed to heating of the bush press

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

d = external diameter of pipe

provoked such deformation as to impede all subsequent re-use. We notice that in aiming to ensure reliability over a period of time of the

for “grip” joints the block nut must be unscrewed thereby enabling

pipe-joint link, the length of the pipe to be linked must always be

removal of pipe together with adapter with taper shank. Beside

rectilinear and such characteristic must also be present in length

the length of tube it is advisable to also replace the adapter

immediately prior to the joint.

and the pipe-wrench ogive.

20

Colori compositi

-

21


MULTYRAMA GUIDA INGLESE 21-10-2009 12:57 Pagina 13

9.

INSTALLATION TECHNIQUE

2.

Installation using joints (with T-joints and possibly 90° elbows).

FIXED POINTS, SLIP POINTS AND EXPANSION ARM

shower

Fixed points

Their function is to obstruct movement of pipes and for this reason a rigid connection between installation on the one hand and the building

W.C.

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

bidet

lavabo

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

THERMAL EXPANSION

All materials including those which constitute Multyrama pipe, if submitted to temperature variation expand or contract in proportion to their expansion a ratio. It follows that if the pipe is installed without an expander, it is subject to a variation of length

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,

ΔL = a • L • ΔT

therefore, that the presence of fixed points limits the length of the

where:

restrained pipe to enable dilator L. to lessen, as a consequence, the relevant ΔL value.

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

Example of fixed point

in K (maximum or minimum) On determining expansion it is necessary to begin the necessary techniques in such as way as to prevent that such a phenomenon does not provoke problems to the pipe itself. For this is it necessary to fit the installation with fixed points and slip points. Indicated with this name are the constraints which integrally render the pipe to the structure of the buildings, by totally or only partially impeding movement consequential to thermal expansion.

26

Colori compositi

wall fixture pipe Multyrama

fixed point

27

joint

fixed point


MULTYRAMA GUIDA INGLESE 21-10-2009 12:57 Pagina 14

9.

INSTALLATION TECHNIQUE

Slip points

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

CALCULATION OF EXPANSION

Calculation of expansion for Multyrama pipe is carried out by applying the following formula: ΔL = α • L • ΔT

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

ΔL = expansion of pipe mm

surface area.

α = ratio of linear expansion of material mm/m°C:

where:

MULTYRAMA = 0.026 mm/m°C

The slip points also function as a support and guarantee (if positioned in sufficient numbers) maintenance of the installation’s geometrical

L = lenght of pipe free to expand m

rectilinear in the presence of thermal stress.

ΔT = difference between the maximum temperature exercised and

Generally, positioning intervals are:

that of the ambience at time of mounting °C

Example:

d. 16 and 20 = L 100 cm

One must calculate the ΔL expansion of a lenght of MULTYRAMA pipe ø 20X2.5 at 8 m. lenght.

d. 26 = L 150 cm d. 32/40/50 = L 200 cm

T amb

d 63 = L 250 cm

T max

= 70°C (maximum temperature exercised);

L

= 8 m;

= 20°C (ambience temperature);

ΔL = α • L • ΔT = 0.026 • 8 • (70-20) = 10.4 mm

Example of slip points

To graphically calculate expansions of MULTYRAMA, the following diagram can be used: wall fixture

permitted axial flow

pipe Multyrama

slip point

Expansion arm

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)

Once the entity of the expansion has been determined it is necessary,

F = material constant (for Multyrama 30)

if the installation has been mounted externally, to use fixed points, slip

D = diameter of pipe (mm)

points and, possibly, expansion arms to impede damage to pipe following

ΔL = variation in lenght of pipe (mm)

variations in length.

28

Colori compositi

29


MULTYRAMA GUIDA INGLESE 21-10-2009 12:57 Pagina 15

9.

INSTALLATION TECHNIQUE

COMPENSATION USING EXPANSION ARMS

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.

GRAPHICAL EXAMPLES

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.

Calculation of these expansion arms is carried out by way of the following L

formula: LS = F • √ D • ΔL

EXAMPLE

ΔL

ΔL

L

wherein:

F =

material constant (for multi layers = 30)

D =

external diameter of pipe (mm)

ΔL =

variation of lenght of pipe (mm)

FP

FP LS

lenght of expnasion arm (mm)

LS

LS =

FP D =

20 mm

L =

8m

ΔT =

50°C

from the preceding example is obtained: ΔL =

10.4 mm of which

LS =

30 √ 20•10.4 = 433 mm

FP

Example of dilating arm

ΔL

LS

LS

L

LP FP

FP

FP

30

Colori compositi

LP

31

L

ΔL


MULTYRAMA GUIDA INGLESE 21-10-2009 12:57 Pagina 16

9.

10.

INSTALLATION TECHINIQUE

THERMAL INSULATION

Thermal insulation for central heating, air-conditioning and sanitary plumbing installations

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

Fixed point at the base of

Fixed point in the column’s

column area

intermediary

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. Thermal conductivity of insulation w/m°K

Absorption of lenght with compensation ring in a direct conductor

External diameter of pipes <20

from 20 to 39

from 40 to 59 from 60 to 79 from 80 to 99

>100

0,030

13

19

26

33

37

40

0,032

14

21

29

36

40

44

0,034

15

23

31

39

44

48

0,036

17

25

34

43

47

52

0,038

18

28

37

46

51

56

0,040

20

30

40

50

55

60

0,042

22

32

43

54

59

64

0,044

24

35

46

58

63

69

0,046

26

38

50

62

68

74

0,048

28

41

54

66

72

79

0,050

30

44

58

71

77

84

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.

32 28

Colori compositi

33


MULTYRAMA GUIDA INGLESE 21-10-2009 12:57 Pagina 17

11. WARNING PREMISE

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

JOINTS WITH FEMALE THREAD

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

the correct use of Multyrama pipes.

between the parts to be assembled, nor to use alternative materials to hemp such as Teflon or similar.

CONDITIONS

One must also make sure that the male part has a sufficient length to

Use of Multyrama in the ambit of work conditions creates no problems

enable coupling; generally, it is auspicious that at least one thread

whatsoever to material. To the contrary exceeding limited conditions

remains outside coupling.

of use can prejudice the product’s resistance. It is, therefore, indispensable

In the case where the installation requirements render necessary coupling

to take every precaution to avoid this happening, thereby safeguarding

of a joint to a pipe or a joint in iron the use of Multyrama joint system

not only the system’s integrity but also that of the user.

ULTRA VIOLET RAYS

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.

with male thread to create such a link is advisable.

INSTALLATIONS AT AMBIENCE TEMPERATURE ≤ 0°C

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

CONTACT WITH SHARP OBJECTS

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.

PE-Xc characteristics. For this reason it is, therefore, necessary to avoid creation of the aforementioned phenomenon, by foreseeing : 1. for central heating installations -

emptying if inactive

-

added anti-freeze additives (as in the case of air-conditioning installations)

-

34

Colori compositi

opportune insulation

35


MULTYRAMA GUIDA INGLESE 21-10-2009 12:57 Pagina 18

12. TESTING OF INSTALLATION

11. WARNING 2. for sanitary installations

PROCEDURE

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

In this case, hygiene requirements exclude all possibility of lowering the

to ascertain that, for whatever cause, the installation installed bears no

ice level by way of added additives and must, as a consequence,

leak points.

prevalently operate on the degree of insulation of the pipes and, for

The undertakings to be carried out are as follows :

the more exposed tracks, create recycling rings. - Sight inspection of pipes and joints N.B. Very often the pipesâ&#x20AC;&#x2122; insulation is erroneously interpreted as being

In this way it can be verified that installation of pipes and connecters

a solution of certain reliability over a period of time, suitable to ward off

have been installed correctly and that there are no parts which have

danger of reaching freezing point.

been accidentally damaged by sharp points.

It is also opportune to take into account that insulation represents a barrier whose aim is essentially to delay creation of such a phenomenon

- Hydraulic proof test

and certainly not to exclude it entirely.

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,

CURVATURE IN PROXIMITY JOINT

after 30 minutes read the pressure value after a further 30 minutes: if the Pipe bending must be avoided when assembly has been realized, by

variation is inferior to 0.6 bar the installation does not present leaks.

placing leverage on the joint, as in that way causing stress in cutting

Continue the test for a further 2 hours.

the pipe.

3. Read the pressure value after 2 hours, if the pressure diminishes beyond

Curvature should always precede assembly and the pipe tract,

0.2 bar there is a leak in the system, otherwise the test is positive.

immediately before connection, must be aligned with the jointâ&#x20AC;&#x2122;s axel. For installation tracks it is possible to omit interventions stated under point 3. PROOF TEST = MAXIMUM WORKING PRESSURE x 1,5

36

Colori compositi

37


MULTYRAMA GUIDA INGLESE 21-10-2009 12:57 Pagina 19

12. TESTING OF INSTALLATION

13. LOSS OF WEIGHT WATER AT 20 °C VELOCITY (m/s)

LOSS OF WEIGHT (m/m)

INTERNAL DIAMETER (mm)

LOAD (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.

DIAGRAMS OF LOSS OF WEIGHT

B

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

C

Pipe: ø 16 x 2,25 ø int. = mm 11,5 (point A)

A

velocity 1,5 m/s (point B)

D

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.

38

Colori compositi

39


MULTYRAMA GUIDA INGLESE 21-10-2009 12:57 Pagina 20

n

13. WATER AT 60째C

NOTES

WATER AT 60 째C VELOCITY (m/s)

LOSS OF WEIGHT (m/m)

40

Colori compositi

INTERNAL DIAMETER (mm)

LOAD (l/s)

41


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

n

NOTES

42

Colori compositi


MULTYRAMA GUIDA INGLESE COP 21-10-2009 12:56 Pagina 2

EDITION 1: September 2009

43

Colori compositi


VIA RANGO, 58 25065 LUMEZZANE BS ITALIA T +39 030 8920992 F +39 030 8921739 WWW.PRANDELLI.COM PRANDELLI@PRANDELLI.COM

Colori compositi

PIPE IN PE-X/AL/PE-X AND BRASS-FITTINGS

MULTYRAMA GUIDA INGLESE COP 21-10-2009 12:56 Pagina 1


Ct ing multyrama  

Ct ing multyrama

Advertisement
Read more
Read more
Similar to
Popular now
Just for you