What does SDR mean on a polyethylene pipe?

SDR is the standard dimension ratio — the outer diameter divided by the wall thickness (SDR = DN ÷ en). A lower SDR means a thicker wall and a higher pressure rating.

What is the difference between PE80 and PE100 in the chart?

At a given SDR the wall thickness is the same for both grades, but the pressure rating differs. PE100 has the higher long-term strength, so it rates one PN step above PE80 — SDR 11 is PN 12.5 in PE80 and PN 16 in PE100.

Which diameters does Bukan Pipe produce?

The water supply chart covers 16 to 630 mm, gas pipe 25 to 225 mm and drip irrigation pipe 12 to 32 mm. Not every diameter and SDR combination is made; a dash in the chart means that combination is not produced.

Why is there no weight column?

The factory catalogue publishes no kg/m figures. The weight column stays hidden until the technical department confirms those numbers, so that an unverified figure is never presented as a specification.

BUKAN PIPE

HDPE Pipe Dimensions Chart

Catalogue dimension charts for Bukan Pipe water supply, gas and drip irrigation pipe.

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This page publishes the Bukan Pipe catalogue dimension tables as they stand: outer diameter, wall thickness and SDR for water supply, gas and drip irrigation pipe. No figure is calculated or rounded, and a dash means that diameter is not produced in that SDR.

How SDR, PN and wall thickness relate

SDR is the ratio of outer diameter to wall thickness: SDR = DN ÷ en. The smaller the SDR, the thicker the wall relative to the diameter, and the more pressure the pipe carries. That is why SDR 6 is the thickest wall and the highest PN in the water table, and SDR 51 the thinnest.

PN is the nominal pressure in bar at the 20 °C reference temperature. For a given SDR the material grade also moves the rating: PE100 has the higher long-term strength, so at the same SDR it rates one PN step above PE80. The water table shows this directly — SDR 11 is PN 12.5 in PE80 and PN 16 in PE100.

Above 20 °C the allowable pressure is corrected by a temperature derating factor. Choose the SDR from the design pressure, operating temperature and installation conditions — not from the chart alone.

Water supply pipe

HDPE water supply pipe dimensions — DIN 8074 / ISO 4427-2
Outer diameter DN(mm)	Nominal pressure (PN) bar
	PE802.5PE1003.2	PE803.2PE1004	PE804PE1005	PE805PE1006	PE806PE1008	PE808PE10010	PE8010PE10012.5	PE8012.5PE10016	PE8016PE10020	PE8020PE10025	PE8025PE100—
	SDR51	SDR41	SDR33	SDR26	SDR21	SDR17	SDR13.6	SDR11	SDR9	SDR7.4	SDR6
16	—	—	—	—	—	—	—	—	2	2.3	3
20	—	—	—	—	—	—	—	2	2.3	3	3.4
25	—	—	—	—	—	—	2	2.3	3	3.5	4.2
32	—	—	—	—	—	2	2.4	3	3.6	4.4	5.4
40	—	—	—	1.8	2	2.4	3	3.7	4.5	5.5	6.7
50	—	—	1.8	2	2.4	3	3.7	4.6	5.6	6.9	8.3
63	—	1.8	2	2.5	3	3.8	4.7	5.8	7.1	8.6	10.5
75	1.8	2	2.3	2.9	3.6	4.5	5.6	6.8	8.4	10.3	12.5
90	1.8	2.2	2.8	3.5	4.3	5.4	6.7	8.2	10.1	12.3	15
110	2.2	2.7	3.4	4.2	5.3	6.6	8.1	10	12.3	15.1	18.3
125	2.5	3.1	3.9	4.8	6	7.4	9.2	11.4	14	17.1	20.8
140	2.8	3.5	4.3	5.4	6.7	8.3	10.3	12.7	15.7	19.2	23.3
160	3.2	4	4.9	6.2	7.7	9.5	11.8	14.6	17.9	21.9	26.6
180	3.6	4.4	5.5	6.9	8.6	10.7	13.3	16.4	20.1	24.6	29.9
200	3.9	4.9	6.2	7.7	9.6	11.9	14.7	18.2	22.4	27.4	33.2
225	4.4	5.5	6.9	8.6	10.8	13.4	16.6	20.5	25.2	30.8	37.4
250	4.9	6.2	7.7	9.6	11.9	14.8	18.4	22.7	27.9	34.2	41.6
280	5.5	6.9	8.6	10.7	13.4	16.6	20.6	25.4	31.3	38.3	46.5
315	6.2	7.7	9.7	12.1	15	18.7	23.2	28.6	35.2	43.1	52.3
355	7	8.7	10.9	13.6	16.9	21.1	26.1	32.2	39.7	48.5	59
400	7.9	9.8	12.3	15.3	19.1	23.7	29.4	36.3	44.7	54.7	66.5
450	8.8	11	13.8	17.2	21.5	26.7	33.1	40.9	50.3	61.5	—
500	9.8	12.3	15.3	19.1	23.9	29.7	36.8	45.4	55.8	68.3	—
560	11	13.7	17.2	21.4	26.7	33.2	41.2	50.8	62.5	—	—
630	12.3	15.4	19.3	24.1	30	37.4	46.3	57.2	—	—	—

SDR is the standard dimension ratio, en the nominal wall thickness in mm and DN the outer diameter in mm. A dash means that diameter is not produced in that SDR.

Gas supply pipe

Gas pipe is produced in SDR 11 and SDR 13.6. The tabulated wall thickness is a minimum; the bracketed figure is the catalogue's plus tolerance.

HDPE gas supply pipe dimensions — INSO 11233
Nominal size(mm)	Max external diameter	Max double width (branch)	Min wall thickness SDR 11	Min wall thickness SDR 13.6	Package	Length (m)
25	25.3	1.2	3 (+0.4)	—	coil	100
32	32.3	1.3	3 (+0.4)	—	coil	100
63	63.4	1.5	5.8 (+0.7)	4.7 (+0.6)	coil	100
90	90.6	1.8	8.2 (+1)	6.7 (+0.8)	branch / coil	12 / 50
110	110.7	2.2	10 (+1.2)	8.1 (+1.1)	branch	12
125	125.8	2.5	11.4 (+1.3)	9.2 (+1.1)	branch	12
160	161	3.2	14.6 (+1.6)	11.8 (+1.3)	branch	12
200	201.2	4	18.2 (+2)	14.7 (+1.6)	branch	12
225	226.4	4.5	20.5 (+2.2)	16.6 (+1.8)	branch	12

Wall thickness is a minimum; the bracketed figure is the catalogue's plus tolerance. Maximum 10% wall thickness.

Drip irrigation pipe

Drip irrigation pipe dimensions — ISO 8779
Nominal size(mm)	S 4SDR 9	S 5SDR 11	S 6.3SDR 13.6	S 8SDR 17	S 10SDR 21	S 12.5SDR 26
Nominal size(mm)	PE32 · PE406 · 8	PE32 · PE40— · 6	PE32 · PE404 · —	PE32 · PE40— · 4	PE32 · PE402.5 · —	PE32 · PE40— · 2.5
12	1.4	1.1	—	—	—	—
16	1.8	1.5	1.2	1	—	—
20	2.3	1.9	1.5	1.2	1	—
25	2.8	2.3	1.9	1.5	1.2	1
32	3.6	2.9	2.4	1.9	1.6	1.3

Wall thickness is the minimum (e min) in mm. The usual outer diameter is 16 mm and the coil length 400 m; other sizes are made to order.

FAQ

What does SDR mean on a polyethylene pipe?: SDR is the standard dimension ratio — the outer diameter divided by the wall thickness (SDR = DN ÷ en). A lower SDR means a thicker wall and a higher pressure rating.
What is the difference between PE80 and PE100 in the chart?: At a given SDR the wall thickness is the same for both grades, but the pressure rating differs. PE100 has the higher long-term strength, so it rates one PN step above PE80 — SDR 11 is PN 12.5 in PE80 and PN 16 in PE100.
Which diameters does Bukan Pipe produce?: The water supply chart covers 16 to 630 mm, gas pipe 25 to 225 mm and drip irrigation pipe 12 to 32 mm. Not every diameter and SDR combination is made; a dash in the chart means that combination is not produced.
Why is there no weight column?: The factory catalogue publishes no kg/m figures. The weight column stays hidden until the technical department confirms those numbers, so that an unverified figure is never presented as a specification.
Can I select a pipe straight from this chart?: The chart is a starting point, not a selection. The SDR has to follow from the design pressure, operating temperature and installation conditions. Use the pipeline design calculator for a first pass and confirm with the technical department.

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