Внутренний раздел

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Energy Efficiency

Inside cement mortar lining of the ductile iron pipes doesn't only ensure observation of the hygienic requirements at potable water transportation, but also improves the hydraulic propetries of the ductile iron pipelines.

Roughness factor (according to COLEBROOK formula) of the inner surface of the ductile iron pipe with inside cement-mortar lining is K - 0,03 for every single pipe. It is recommended to take K - 0,1 for DN 80-250 mm.; K - 0,08 for DN 300-700 mm.; K - 0, 05 for DN 700-1000 mm. for calculations when deigning pipeline systems out of ductile iron so that all friction losses in the assembled pipeline system are considered. that means that ductile iron pipes with inside cement-mortar lining permit to reduce hydraulic losses through friction in the pipeline to a considerable extent and correspond to all the modern energy conservation requirements.

Besides, big flow section of ductile iron pipes compared to polyethylene pipes (with the equal value of nominal bore DN), makes possible a considerable pumping cost reduction of the transported liquid. 

The clear opening comparison between ductile iron and polyethylene pipes


DN,

мм

Ductile Iron pipes Svobodny Sokol,

Technical specifications1461-037-50254094-2008

Polyethylene Pipes PE-100 SDR 17,

ALL Union State Standard 18599-2001

Ratio of ductile iron pipe clear opening to PE clear opening

External diameter,

mm

Wall thickness with cement-mortar lining,

mm

Internal diametr,

mm

Passage area, 

sq. mm

External diamener,

mm

Wall thickness, mm

Internal diameter, mm

Passage area, 

sq. mm

80 98 9,0 80,0 5024 90 5,4 79,2 4924 1,02
100 118 9,0 100,0 7850 110 6,6 96,80 7356 1,07
125 144 9,0 126,0 12346 140 8,3 123,40 11954 1,04
150 170 9,0 152,0 18137 160 9,5 141,00 15607 1,16
200 222 9,3 203,4 32477 225 13,4 198,20 30837 1,05
250 274 9,8 254,4 50805 280 16,6 246,80 47815 1,06
300 326 10,2 305,6 73312 355 21,1 312,80 76807 0,95
350 378 12,7 352,6 97597 400 23,7 352,60 97597 1,00
400 429 13,1 402,8 127365 450 26,7 396,60 123474 1,03
500 532 14,0 504,0 199403 560 33,2 493,60 191258 1,04
600 635 14,9 605,2 287520 630 37,4 555,20 241974 1,19
700 738 16,8 704,4 389501 710 42,1 625,80 307426 1,27
800 842 17,7 806,6 510724 800 47,4 705,20 390386 1,31
900 945 18,6 907,8 646919 900 53,3 793,40 484145 1,31
1000 1048 19,5 1009,0 7991914 1000 59,3 881,40 609840 1,31

Ductile iron pipe and PE pipe clear passage area comparison DN 100 mm

Сравнение проходного сечения

a

With the same nominal diameter of ductile iron pipe and PE pipe the clear opening of the ductile iron pipe with inside cement-mortar lining is 30 % bigger than polyethylene one. in diameter range 80 - 1000 mm respectively. 



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