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Products - PP-R PIPES & FITTINGS



Exposed Installation
Ducts
Cold Water Risers

There is no need for expansion joint as there will be no linear expansion for Vesbo cold water pipes. Vertical Support is necessary like all other piping system.

Ceiling   Walls

During the planning and laying of visible pipes for hot water on ceiling or walls, besides taking into account the support intervals, special attention must be given to the linear expansion due to temperature. This will also prevent sagging and "snaking" of pipe lines. No consideration is necessary for Stable pipes. Hence, to prevent unsightly installation, the following appropriate procedure must be observed:

Linear Expansion

For transportation of hot water, like all metal or plastic pipes, we have to deal with its linear expansion. This applies only to PN (SDR6) 20 pipes for hot water applications. No consideration is necessary for PN 25, Stable pipes as the coefficient of linear expansion is 3.0 x 10 -5 K-1

The coefficient of linear expansion for Vesbo PN 20 (SDR6)pipes is 15.0 x 10 -5 K-1

r I =µ L x rt

Where:

rI =

linear expansion,mm
 

 µ =

coeff.of linear expansion,constant
For Vesbo pipes 0.15 mm/mK
 

  L =

 pipe length,m
 

rt =

temperature difference between normal water
temperature and desired operating hot
water temperature,K



r I =µ L x rt
= 0.15 x 1.5 x 35
linear expansion is 7.88˜8 mm

By reading off table PN 20 (SDR)

Pipe
Length L(m)
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.5
6.0
6.5
7.0
7.5
8.0
VESBO Pipe Diameter (mm)
10 20 30 40 50 60 70
0.15 0.30 0.45 0.60 0.75 0.90 1.05
0.30 0.60 0.90 1.20 1.50 1.80 2.10
0.45 0.90 1.35 1.80 2.25 2.70 3.15
0.60 1.20 1.80 2.40 3.00 3.60 4.20
0.75 1.50 2.25 3.00 3.75 4.50 5.25
0.90 1.80 2.70 3.60 4.50 5.40 6.30
1.05 2.10 3.15 4.20 5.25 6.30 7.35
1.20 2.40 3.60 4.80 6.00 7.20 8.40
1.35 2.70 4.05 5.40 6.75 8.10 9.45
1.50 3.00 4.50 6.00 7.50 9.00 10.50
2.25 4.50 6.75 9.00 11.25 13.50 15.75
3.00 6.00 9.00 12.00 15.00 18.00 21.00
3.75 7.50 11.25 15.00 18.75 22.50 26.25
4.50 9.00 13.50 18.00 22.50 27.00 31.50
5.25 10.50 15.75 21.00 26.25 31.50 36.75
6.00 12.00 18.00 24.00 30.00 36.00 42.00
6.75 13.50 20.25 27.00 33.75 40.50 47.25
8.25 16.50 24.75 33.00 41.25 49.50 57.75
9.00 18.00 27.00 36.00 45.00 54.00 63.00
9.75 19.50 29.25 39.00 48.75 58.50 68.25
10.50 21.00 31.50 42.00 25.50 63.00 73.50
11.25 22.50 33.75 45.00 56.25 67.50 78.75
12.00 24.00 36.00 48.00 60.00 72.00 84.00

Note : For PN25, stable pipes,the above can be obtained by dividing by 5

Step 2. Once the Linear Expansion is established, compensation for this expansion for this expansion can be made by either an Expansion Elbow or Expansion Loop.

FS=Fixed Support SS=Sliding Support EA=Elbow Arm


Formula to Determine the length of Elbow Arm EA:

EA = kx(dxrI)1/2

where k = constant, 15

rI = Linear expansion

d = pipe diameter

Note:In an elbow expansion joint the FS must be located at the EA section and the EA perpendicular to direction of expansion

            

Example

Pipe of diameter 25 mm length of 1.5m normal cold water temperature is 25oC and hot water from water heater is set at 60 oC.

EA = k x (dxr)1/2

= 15 x (25x8)1/2

= 212.13-212 mm
Expansion Loop.
FS= Fixed Support    SS=Sliding Support  EA=Elbow Arm


                


Formula to detrtmine the Loop Width LW

LW=(2xrI)+SW

Where SW=Safety Width,assigned as 150 mm

rI=Linear expansion

Not:In an expansion loop, the FS is located at the pipe section of LW. All other pipe supports must be SS.Calculation of EA is the same as above Expansion elbow example.

            

Example:

Pipe of diameter 25 mm Length of 1.5 m normal cold water temperature is25oC and hot water from water heater is set at 60 oC

LW = (2xrI)+SW
= (2x8)+150

The loop width is 166 mm