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
DN, мм	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

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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