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Pipe Support Calculator

Run length and spacing give bracket count and steel weight.

Quick answer

With the default inputs: Pipe run 60 · Maximum spacing 3 · Weight per bracket 6.5 etc.Bracket count 21 pcs

Edit the inputs below to recalculate.
Spacing sRun L
Brackets sit at equal spacing with one at each end, so the count is the spans plus one.

Inputs

Length of one pipe run at one level and direction
3 m insulated, up to 6 m for bare DN100 steel, 1-1.5 m for plastic
Arm, post, clamp and fasteners included
pcs
How many pipes share one bracket
%
Cutting, drilling and rework — usually 3-8%

Result

Bracket count
21pcs
Pipe run60.0m
Spans20bays
Brackets21pcs
Actual spacing3.00m
Net bracket weight136.5kg
Weight with waste143.3kg
Steel per metre of pipe2.39kg/m
At 6 m spacing11pcs
At 1.5 m spacing41pcs

Bracket count = spans + 1, not length ÷ spacing rounded. Both ends need support: 60 m at 3 m is 21 brackets over 20 spans, and 20 brackets would leave one end hanging. Always round up then add one, or the last span exceeds the limit. Spacing follows material and size: bare steel 2 m below DN25 and about 6 m at DN100; insulated pipe never more than 3 m or the insulation crushes; copper and stainless need closer spacing for thermal movement; plastic 1-1.5 m. Add a fixed anchor every 15-20 m on horizontal runs.

Formula

SpansN = ⌈run ÷ spacing⌉
Bracket countn = N + 1 (both ends supported)
Actual spacingd = run ÷ (n − 1)
Net weightG = n × weight per bracket × pipes
With wasteG = G × (1 + waste)
60 m of pipe at 3 m spacing with 6.5 kg per bracket, one pipe and 5% waste: 20 spans need 21 brackets at 3.00 m actual spacing, 136.5 kg net, 143.3 kg with waste, or 2.39 kg per metre of pipe.

How to work it out

  1. Spans N = ⌈run ÷ maximum spacing⌉, rounded up because a partial span still needs a support.
  2. Bracket count n = N + 1 — both ends are supported. Omitting the plus one is the commonest undercount.
  3. Actual spacing d = run ÷ (n − 1); after rounding, recheck that it does not exceed the code limit, otherwise add brackets.
  4. Net weight = n × weight per bracket × pipes sharing the bracket, multiplying for multi-pipe supports.
  5. With waste, total = net × (1 + waste rate), allowing 5-8% for cutting, drilling and offcuts.
  6. Check thermal movement: steam and hot-water lines need a sliding support roughly every 10 m with an expansion compensator. Making everything a fixed support buckles the pipe or tears the welds.

Where it goes wrong

Material and cost

Pipe supports fabricated and installed run 8-15 CNY/kg, proprietary clamps 3-15 CNY each by diameter. Section steel is about 4-5 CNY/kg. Supports are typically 10-15% of a piping installation, and insulated lines need timber or PU saddles on top.

On site

Basis

FAQ

Why one extra bracket?
Both ends must sit on a support. A 60 m run at 3 m needs 20 spans, and 20 spans need 21 supports with one at each end. Placing only 20 gives 19 spans and an average of 3.16 m, over the limit, or leaves a 3 m cantilever whose self-weight and contents bend the joint open. Hence round the span count up and add one.
Why must insulated pipe stay within 3 m?
Because the insulation — mineral wool, elastomeric, PU — is weak and a bracket is a point load. Too wide a span flattens it, killing the insulation value and creating a thermal bridge (condensate dripping from chilled lines, extra heat loss from hot). The cladding then cracks, lets water in and performance drops further. Codes cap insulated spacing at 3 m, with chilled water often at 2.5 m. Wood or high-density inserts at the bracket allow wider spacing.
How are anchors and slides arranged?
Slides carry weight and allow axial movement, using U-bolts or pipe shoes; anchors lock the pipe and take the thermal thrust from both sides. Place an anchor every 15-20 m of straight run, with guides and slides between, and let an expansion loop, bellows or sleeve absorb the movement in the middle. Anchors see large forces and must land on structural beams or a dedicated frame — never on masonry or lightweight partitions.

Cite this page

Use this format in reports, method statements or coursework. The link is permanent.

Building Calculator. Pipe Support Calculator. 2026-10-25. https://jianzhujisuan.com/en/pipe-support

Results are estimating aids only and are not a design basis. Construction and final accounts must follow the drawings, the applicable standards and an approved method statement. Anything affecting structural safety, shoring or falsework must be checked by a suitably qualified engineer.