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Pipe hangers: spacing, quantity, rod size
Choose the pipe size and straight run length. Get maximum spacing, number of hangers, rod size and load per hanger.
Quick answer
A 30 m run of DN100 pipe needs hangers at most 4.6 m apart: 7 hangers, M10 (3/8") rod, design load about 595 kg each.
Preliminary results
Max spacing4.6m
Hangers7pcs
RodM10(3/8")
Design load per hanger595kg
| Step | Result | Basis |
|---|---|---|
| Pipe + water12.18 + 8.71 | 20.89 kg/m | — |
| Number of hangers⌈30/4.6⌉ | 7 pcs | NFPA 13 ⚠ |
| Design load5 × 20.89 × 4.6 + 114 | 595 kg | NFPA 13 ⚠ |
Sources and assumptions. NFPA 13: steel pipe hanger spacing (DN25–DN32: 3.7 m; DN40 and up: 4.6 m), rod size by pipe size, hangers rated for 5 × water-filled pipe weight plus 114 kg ⚠. Every branch needs at least one hanger; add at ends and changes of direction. ⚠ = code table value to be checked against the original standard. Preliminary results for material selection and budgeting; not a substitute for an approved fire protection design.
Suggested materials
Pipe hanger DN100 (clamp + M10 (3/8") rod)7 pcs
Threaded rod M10 (3/8")per drawing
Steel pipe hanger spacing
| Size | Max spacing | Rod | Pipe + water (kg/m) |
|---|---|---|---|
| DN25 (1") | 3.7 m | M10 (3/8") | 2.99 |
| DN32 (1-1/4") | 3.7 m | M10 (3/8") | 4.11 |
| DN40 (1-1/2") | 4.6 m | M10 (3/8") | 4.94 |
| DN50 (2") | 4.6 m | M10 (3/8") | 7.25 |
| DN65 (2-1/2") | 4.6 m | M10 (3/8") | 10.16 |
| DN80 (3") | 4.6 m | M10 (3/8") | 13.51 |
| DN100 (4") | 4.6 m | M10 (3/8") | 20.89 |
| DN125 (5") | 4.6 m | M12 (1/2") | 29.82 |
| DN150 (6") | 4.6 m | M12 (1/2") | 38.63 |
Frequently asked questions
How far apart are sprinkler pipe hangers?
Steel DN25–DN32 at most 3.7 m, DN40 to DN200 at most 4.6 m (NFPA 13). Short branches still need at least one hanger.
What rod size?
Pipe up to DN100: M10 (3/8") rod; DN125–DN200: M12 (1/2").