Descaling of Old Pipelines

Perfect elimination of very hard and tough scales and deposits formed in existing pipelines provides energy saving by recovery of flow-rate and pump pressure to design values.

PURPOSE OF DESCALING

  • Elimination of very hard and tough deposit formed in old pipelines
  • Energy conservation by returning flow-rate and pressure to the design values
  •  Control of fluid purity

Before and after descaling

BEFORE

AFTER

BEFORE

AFTER

APRO DESCALING PIGS

DISCHARGED SCALE

EXAMPLE OF HEAVY SCALE DEPOSIT

Classification of Piggable Pipeline Features

Note 1) Unpiggable pipe features should be replaced with pipe pups or spools

Note 2) Reducers may be removed depending on the actual pipeline figure

Piggable pipe features

  1.   VENT
  2.   90˚ LONG OR SHORT ELBOW
  3.   45˚ ELBOW
  4.   GATE, BALL VALVES
  5.   SAFETY-RELIEF VALVE
  6.   DRAIN
  7.   PRESSURE GAUGE
  8.   TEE
  9.   FLANGE

Unpiggable pipe features

10.   ORIFICE (INSTRUMENT)
11.   FLOW-METER
12.   CONTROL VALVE
13.   EXPANSION JOINT, FLEXIBLE JOINT
14.   STRAINER
15.   SPECTACLE BLIND FLANGE
16.   THERMOMETER
17.   CHECK, GLOBE, BUTTERFLY VALVES