Purpose: Designed to compensate for small to medium vertical displacements of pipelines (typically up to 50–75 mm) caused by thermal expansion or contraction, while carrying the pipe load.
Working principle: Contains a helical coil spring housed in a steel canister. The supporting force varies linearly with spring compression or extension.
Design models (according to PIHASA):
CVC – displacement ≤ 12 mm
CV – 12 mm < Δy ≤ 25 mm
CVL – 25 mm < Δy ≤ 50 mm
CVLL – 50 mm < Δy ≤ 80 mm
Allowable load variation: According to MSS SP-58, the load variation between cold (installation) and hot (operating) positions must not exceed 25%.
Main components:
Coil spring (single or multiple)
Canister with corrosion protection
Adjustment & locking device (e.g., turnbuckle)
Travel scale and load indicator
Nameplate with design data
Installation types:
As hangers (top-mounted, suspending the pipe)
As supports (bottom-mounted, pipe rests on the unit)
Several types (A–H) are available depending on the mounting conditions.
Commissioning requirements: Cold load must be preset; travel stops must be removed after installation; locking nuts properly tightened.
Ensures safe support of piping while allowing controlled vertical movements.
Reduces stress on nozzles, flanges, and equipment.
Used where vertical displacement is relatively small and load variation ≤ 25% — common in thermal power plants, chemical plants, refineries, and pipelines around turbines, pumps, and compressors.
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