Main Indexs of Pre-insulated Pipe
Product Name	Product Indexes	Reference Standard	Unit	Standard Requirement
Finished product	Steel pipe without thermal insulation layer	CJ/T114-4.4.1	mm	150-250
	Increasing rate of HDPE outer protection pipe	CJ/T114-4.4.2	%	≤ 2
	Axis eccentricity	CJ/T114-4.4.3	mm	see clause 4.4.3
	Expectation of life	CJ/T114-4.4.4.1	year	120℃ 30 years
	Shear strength(170℃,1450h after aging)	CJ/T114-4.4.4.2	MPa	(23±2℃)>0.12 (140±2℃) >0.08
	Shock resistance	CJ/T114-4.4.5	3kg/2m	see clause 4.4.5
	Resistance value between alarm line	CJ/T114-4.4.6	MΩ	more than 20MΩ
Outer protection pipe	Density	CJ/T114-4.2.3.1	kg/m3	≥940
	Elongation at break	CJ/T114-4.2.3.4	%	≥350
	Tensile yield stength	CJ/T114-4.2.3.4	MPa	≥19
	Longitudinal shrinkage rate	CJ/T114-4.2.3.5	%	≤3
	Long term Mechanical properties	CJ/T114-4.2.3.6	80℃ 4.0MPa	>1500h free from damage
	The difference of the melt flow rate	CJ/T114-4.2.3.2	g/10min	≤0.5
	Carbon Black content	CJ/T114-4.2.3.1	%	2.5±0.5
Polyurethane insulation layer	Density	CJ/T114-4.3.2	kg/m3	≥60
	Average pore size	CJ/T114-4.3.1	mm	≤0.5
	Percentage of close area	CJ/T114-4.3.1	%	≥88
	Compressive strength	CJ/T114-4.3.3	MPa	≥0.3
	Water absorption	CJ/T114-4.3.4	%	Immersion in boiling water 90 minutes, bubble water absorption should be not more than 10%
	Coefficient of thermal conductivity before aging	CJ/T114-4.3.5	w/(m.k)	≤0.033
	Cavity	CJ/T114-4.3.1		≤1/3 the thickness of insulation layer
Working steel pipe	Seamless steel pipe(≤DN150)	GB8163	20#, X42,X52,X60,X70	Up to standards
Working steel pipe	Spiral steel pipe (≥DN200)	GB/T9711 or SY/T5037	Q235B,Q355B,X42,X52,X60,X70	Up to standards

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