stargroup

Star ISI PVC pipes at a glance

Table 1

Dimensions of Unplasticised PVC Pipes as per IS 4985 :2000
(Clauses 7.1.1. and 7.1.2) All dimensions are in mm

Nominal outside Diameter	Tolerance on outside Diameter	Class 1 2.5 kg/cm²		Class 2 4 kg/cm²		Class 3 6 kg/cm²		Class 4 8 kg/cm²		Class 5 10 kg/cm²		Class 6 12.5 kg/cm²
Nominal outside Diameter	Tolerance on outside Diameter	Min.	Max.	Min.	Max.	Min.	Max.	Min.	Max.	Min.	Max.	Min.	Max.
20	+0.3									1.1	1.5	1.4	1.8
25	+0.3							1.2	1.6	1.4	1.8	1.7	2.1
32	+0.3							1.5	1.9	1.8	2.2	2.2	2.7
40	+0.3					1.4	1.8	1.8	2.2	2.2	2.7	2.8	3.3
50	+0.3					1.7	2.1	2.3	2.8	2.8	3.3	3.4	4.0
63	+0.3			1.5	1.9	2.2	2.7	2.8	3.3	3.5	4.1	4.3	5.0
75	+0.3			1.8	2.2	2.6	3.1	3.4	4.0	4.2	4.9	5.1	5.9
90	+0.3	1.3	1.7	2.1	2.6	3.1	3.7	4.0	4.6	5.0	5.7	6.1	7.1
110	+0.4	1.6	2.0	2.5	3.0	3.7	4.3	4.9	5.6	6.1	7.1	7.5	8.7
140	+0.5	2.0	2.4	3.2	3.8	4.8	5.5	6.3	7.3	7.7	8.9	9.5	11.0
160	+0.5	2.3	2.8	3.7	4.3	5.4	6.2	7.2	8.3	8.8	10.2	10.9	12.6
180	+0.6	2.6	3.1	4.2	4.9	6.1	7.1	8.0	9.2	9.9	11.4	12.2	14.1
200	+0.6	2.9	3.4	4.6	5.3	6.8	7.9	8.9	10.3	11.0	12.7	13.6	15.7

Table 2

Dimensions of UPVC Plain End Pipes for Plumbing in Buildings.
(Clause 7.1.3) All dimensions are in mm

Nominal outside Diameter	Mean Outside diameter		Outside diameter at any point		Wall Thickness
Nominal outside Diameter	Min.	Max	Min.	Max	Min.	Max
20	20.0	20.3	19.5	20.5	2.8	3.3
25	25.0	25.3	24.5	25.5	2.9	3.4
32	32.0	32.3	31.5	32.5	3.4	3.9
40	40.0	40.3	39.5	40.5	3.6	4.2
50	50.0	50.3	49.4	50.6	3.7	4.3

Colour code recommended by BIS for ISI marked pipes of different classes
Class 1	2.5 kg/cm²	Red
Class 2	4 kg/ cm²	Blue
Class 3	6 kg/ cm²	Green
Class 4	8 kg/ cm²	Brown
Class 5	10 kg/ cm²	Yellow
Class 6	12.5 kg/cm²	Black
Plumbing Pipe		Pink

PRESSURE RATING OF THE PIPES
Depending on the height to which water is to be lifted, the class or pressure rating of the pipe is decided. Static head, frictional and other losses should be taken into consideration.
Pressure Rating of Pipes Kg/cm²	Height to which it can be used safely.
2.5	25 mtrs.(80')
4	40 mtrs.(130')
6	60 mtrs.(195')
8	80 mtrs.(260')
10	100 mtrs.(325')
12.5	125 mtrs.( 400')

FRICTION LOSS CALCULATION

The following Hazen Willam formula should be used for friction loss calculation.

Hf   1.213×10¹º×Q1.852
-- =   --------------------
L             D4.87×C1.852

Where
Hf - Head loss in mm
Lf - Length of the pipes
       section in mm
Q - Discharge in litre
D - Internal diameter of
      pipes in mm
C - Hazen Willam
      constant 150