Installation _ Huong Dan Lap Dat Ong Ppr

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Installation PPR piping installation

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Main types of PPR piping installation: -

Internal installation Installation in ducts Open installation

Various basic rules and conditions – including linear thermal expansion, joint method, working conditions and necessary compensation – are to be considered during installation process.

Pipeline mounting technique Two types of pipeline supports are most frequently frequently used: fixed points and sliding points. It is recommended to use pipe clamps with rubber protectors, which are specially designed for PPR pipes; it is important, that the clamp should do not damage the surface of the pipe.

Fixed points This type of fixing is excludes the possibility of compensation; fixed supports should be installed at different sections of the pipe to avoid uncontrolled movement of the pipe. Fixed points normally must be positioned where the system changes direction to ensure ure expansion points are not discharged. The distance between fixed points should be measured properly and the forces of expansion should be considered. Never use pivoting clamps as fixed points.

Sliding points This type of mounting allows the pipe to move e axially in both directions without damaging it. Sliding points should be positioned distantly from the joints (fittings) to ensure the free movement of the pipe without any damaging. Such type of installation does not restrict any expansion movement.

Key to abbreviations  FP – Fixed Point  SP – Sliding Point

Table 4. Distance between supports for Blue Ocean PPR pipes and PPR/Al/PPR pipes (horizontal pipeline)

Internal installation Internal installation is understood as cement or plaster covering installation, under floor or in-wall in installation. During plaster covering installation of the pipeline, the thermal expansion usually is not considered, but isolating of the pipeline should be done in accordance with DIN 1988 Standard. The channel of the insulated pipe should be free and should guarantee compensation of pipeline expansion. If it is not necessary to insulate pipeline (cement covering installation, under floor or in-wall in installation), llation), than installation can be held without considering of thermal expansion, the compensation will be absorbed through the material. During cold water (potable water) pipeline installation pipes should be insulated against heat gain and formation of condensation. It is recommended to make insulation in accordance cordance with DIN 1988, Part 2.

Table 5: Standard values for the minimum insulation (thicknesses thicknesses for cold (potable) water systems Installation in ducts During vertical installation at the time of assembling branches and elbows the compensation of riser pipe should be considered. At such installations it is recommended to use multilayer composite pipes (Blue Ocean PPR/Al/PPR (PE-RT) RT) or Blue Ocean Ocea Fiber-G G pipes), thanks to its advanced characteristics the linear expansion can be not considered. Fixed supports should be used and the distance between them should not exceed 3 meters. If the installation goes with usage of usual PPR pipes, then it is necessary to pay attention to compensation.

Changing in length should be guaranteed by compensator, this compensator has to compensate up and down movements.

If the duct has enough space for installing the flexible arm compensator, then it is recommended to use this type of compensation.

If the duct does not has enough space to install the calculated compensator, the wall hole should be enlarged to guarantee the free movement.

Notice: The pipes to be installed through through the wall holes should be insulated

Open installation During open installation attention to the visual appearance of the pipeline should be paid. PPR pipes have big coefficient of linear expansion, all types of possible compensation should be considered in advance. Blue Ocean PPR/Al/PPR (PE-RT) (PE RT) and Blue Ocean Fiber-G G pipes have much lower linear expansion and it is better to use these pipes when the strict consideration of compensation is needed. The coefficient of linear expansion for Blue Ocean pipes:  PPR pipes:  PPR/Al/PPR pipes:  Blue Ocean Fiber-G G pipes: pipes

α=0.15mm/mºС α=0.03mm/mºС α=0.05mm/mºС

Figure 2. The coefficient of linear expansion for Blue Ocean pipes

Blue Ocean PPR pipes linear expansion calculation example The linear expansion (contraction) is calculated according to the following formula: ∆L = α×L×∆T    

∆L - linear expansion (mm) α - coefficient of linear thermal expansion (mm/mºС) (mm/mº L - initial length of the pipe (m) ∆T - temperature difference between installation and operating temperature (º (ºС)

Example 1:        

∆L - ? (mm) α1 = 0.15mm/mºС С (PPR pipes) α2 = α=0.03mm/mºС С (PPR/Al/PPR pipes) α3 = α=0.05mm/mºС С (Blue Ocean Fiber-G Fiber pipes) L = 5m T1 = 60ºС С (Operating temperature) T2 = 20ºС С (Installation temperature) ∆T = T1 - T2 = 40ºС

Solution:  ∆L = 0.15mm/mºС × 5m × 40ºС 40º = 30mm (PPR pipes)  ∆L = 0.03mm/mºС × 5m × 40ºС 40º = 6mm (PPR/Al/PPR pipes)  ∆L = 0.05mm/mºС × 5m × 40ºС 40º = 10mm (Blue Ocean Fiber-G G pipes)

Linear expansion compensating methods    

Flexible arm Minimal length of the flexible arm is calculated according to the following formula: Ls = C ×

   

Ls - required length of flexible section (mm) C - constant of material (PPR=30) D - pipe outside diameter (mm) ∆L - linear expansion (mm)

Example 2:  Ls - ? (mm)  D = 40mm  ∆L L = 30mm (calculated in Example 1)

Solution: Ls = 30 ×

= 1039mm (Length of flexible flex arm)

Pipe with outside diameter 40mm and length 5m with temperature difference equals to 40ºС should be supported by fixed mounting at the length of 1039mm on the elbowing side.

U-type compensation If linear expansion can not be compensated by changing changing of direction, then it is recommended to use U-type type compensation. Width of U-type type compensation is calculated according to the following formula:  Wk = 2 × ∆L + SL

 Wk - width of compensation (mm)  ∆L - linear expansion (mm)  SL - 150mm (safety distance) Notice: Wk should be ≥ 10D Example 3:  Wk - ? (mm)  ∆L L = 30mm (calculated in Example 1)  SL = 150mm Solution: Wk = 2 × 30mm + 150mm = 210mm The width of U-type type expansion loop should be 210mm.

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