Page 9 - VESBO PP-R Brochure

The table below provides the necessary information for a good welding joint for
Example: MONOLAYER
various sizes of VESBO products.
Pipe of diameter 25mm, Length 1.5m, normal cold water temperature is 25°C and hot water from
water heater is set at 60°C.
Pipe Diameter Welding Depth Heating Time Welding Time Cooling Time Δl = α x L x Δt
(mm) (mm) (sec) (sec) (min) = 0.150 x 1.5 x 35
20 14.0 5 4 2 Linear expansion is 7.8mm
25 15.0 7 4 2
32 16.5 8 6 4
40 18.0 12 6 4
50 20.0 18 6 4 Example: FASER
63 24.0 24 8 6
75 26.0 30 8 8 Pipe of diameter 25mm, Length 1.5m, normal cold water temperature is 25°C and hot water from
90 29.0 40 8 8 water heater is set at 60°C.
110 32.5 50 10 8 Δl = α x L x Δt
125 46.0 65 12 12 = 0.040 x 1.5 x 35
160 47.0 80 15 15 Linear expansion is 2.1mm

Example: STABI
Note: Heating time starts when both the pipe and the fitting are
Pipe of diameter 25mm, Length 1.5m, normal cold water temperature is 25°C and hot water from
pushed into the correct depth. Welding time begins when the water heater is set at 60°C.
Δl = α x L x Δt
joints are connected. Cooling time is the time taken for the joint to = 0.025 x 1.5 x 35
Linear expansion is 1.3mm
be completely cured. Never try to reduce cooling time by pouring
water or any other means. At outdoor temperatures below +5°C,
heating time should be increased approximately by 50%. Step 2: Determine the Expansion Loop and Expansion Elbow
Once the linear expansion is established, compensation for this expansion can
Linear Expansion
be made either by an Expansion Loop or an Expansion Elbow.
For transportation of hot water, like all metal or plastic pipes, we have to deal with its
Expansion Loop Expansion Elbow
linear expansion.
FS = Fixed Support FS = Fixed Support
SS = Sliding Support SS = Sliding Support
Step 1: Determine the Linear Expansion LW = Loop Width, mm EA = Elbow Arm, mm
Loop Width (LW) = ( 2 × Δl) + SW Elbow Arm (EA) = K × (d × Δl)1/2
By Calculation Formula
VESBO Monolayer Pipes : 0.150 mm/mK Where, Where,
Δl = α . L. Δt SW = Safety Width, mm d = Pipe Diameter, mm
VESBO Faser Pipes : 0.040 mm/mK
ΔL = Linear Expansion, mm ΔL = Linear Expansion, mm
Where, VESBO Stabi Pipes : 0.025 mm/mK K = Constant
Δl = linear expansion, mm
α = coeff. of linear expansion,
constant for Vesbo Pipes, mm/mK