Page 254 - Pipeline Pigging Technology

Pigging and chemical treatment

(2) identify the best chemical for the situation, the most effective
dosage and method of application;
(3) start with a clean pipeline. Remove unwanted liquids, scales, and
wax deposits with the appropriate types of pig;
(4) whenever possible, apply chemicals in periodic batch treatments
using pigs;
(5) establish a well-defined maintenance programme, using low-con-
centration chemical injection between batching, and frequent pig-
ging;
(6) select pig designs that are well suited for the application, and keep
the wear parts in good, usable condition.

REFERENCES

1. G.R.Marshall, 1988. Cleaning of the Valhall offshore oil pipeline, Offshore
Technology Conference paper no.5743.
2. E.E.Sperling, M.Craighead, D.Dunbar, and G .Adams, 1989. Vertiline - a new
pipeline inspection service. Presented at Canadian Western Regional
NACE Conference, Vancouver, Feb.
3. B.D.Comeau and CJ.Marden, 1987. Unexpected field corrosion leads to
new monitoring with revised predictive model. Oil and Gas Journal, June
l,pp.45-48.
4. J.W.Costerton and E.S.Lashen, 1984. Influence of biofilm on efficacy of
biocides on corrosion causing bacteria. CORR'83 paper no. 246, Materials
Performance, NACE, Houston, February, pp. 13-17.
5. N.F.Akram and J.A.C.Butler, 1988. Corrosion monitoring and mitigation in
Sajaa gas condensate field. ProcAth Middle East Corrosion Control Confer-
ence, Bahrain, January, pp.535-550.

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