Expansion Joint Reaction & Anchor Load

The total load an anchor sees from pressure thrust and spring force, and what a tied joint changes.

Unit system

Inputs

Pipe sizeDesign pressure (absolute)

The thrust comes from GAUGE pressure — there is atmosphere outside. Enter absolute here; the calculation takes the difference.Effective area of the bellows

Comes from the manufacturer. Leave at zero for an order-of-magnitude estimate from 1.25× the pipe OD — the catalogue figure is required for the final selection.Spring rate (N/m)

From the manufacturer; the force to compress the bellows by one metre.Joint movement

The stroke from the Thermal Expansion calculation.Joint typeGuide friction force (N)

Sliding-support friction also lands on the anchor. Roughly 30–50 % of the pipe weight.

Total anchor load (N)

65,942

Total load (kN)

65.94

Details

Pressure thrust (N)	52,942
Spring force (N)	8,000
Friction (N)	5,000
Effective area used	0.05891 m²
Load in tonnes-force	6.72
Dominant term	Pressure thrust dominates — the anchor is set by pressure, not by the bellows. A softer bellows does NOT reduce this load.

Assumptions

The thrust is computed on GAUGE pressure; atmosphere acts on the outside and pushes back.
Effective area and spring rate are MANUFACTURER data. The estimate here gives the order of magnitude; the anchor’s structural design must use catalogue figures.

Calculation report

A PDF carrying the inputs, results, assumptions and the source. A one-time code is sent to your address.

Source

EJMA · Kompansatör reaksiyon kuvvetleri
EN 14917 · Basınçlı metal körüklü kompansatörler

Results are for engineering pre-assessment and are not a product selection commitment. Final responsibility rests with the user.