Heat shrink sleeves installation :How do you pretreat the surface of steel pipes?

2026,08,12

The coating application sequence should be as follows:

a) The exposed steel area and adjacent pipe coating shall be cleaned of all dust dirt, moisture, salts, grease or other contaminants, if necessary using a non-contaminant solvent, Xylene or equal.

b) Weld area shall be thoroughly abraded to a near white metal finish, SIS SA 2 ½ to yield an anchor pattern of 50-100 microns. Anchor pattern shall be checked using Testex Press-o-film tape. Blasting material shall be either industrial grade grit or copper slag, approved by the Engineer prior to its use at site. Sand shall not be used for blast cleaning of joints. No blasting shall be carried out if Relative Humidity is above 80 %. The line coating adjacent to the weld area shall also be sweep blasted and should be bevelled to less than a 30° angle. The exposed steel and coated areas should be wiped clear of all foreign materials. Grit/slag used shall be free of any slat contaminants and shall be sieved to give the required anchor pattern.

c) Adjacent line coating over which the shrink sleeve shall be shrunk, shall be sweep blasted to give it a rough finish. The sweep blasting shall extend 25 mm beyond the edge of the shrink sleeve.

d) Just prior to sleeve shrinking, the surface of the blast cleaned joint steel area shall be tested for salt contamination using an Elcometer Salt contamination test instrument. The level of salt contamination on the joint steel shall not exceed 4 microgram/sq.cm. If the contamination level exceeds this value, the joint shall be cleaned with clean stilled water and re-blasted. Contamination of the blasting medium may also have to check to ensure that the 4 microgram/sq.cm level is not exceeded.

e) After blasting and as soon as possible (within ½ hour of blasting), joint area shall be pre-heated to the manufacturer’s recommended minimum temperature. A pyrometer shall be used to ensure that correct temperature is reached on steel and the line coating. As a minimum, pre-heating of the steel surface 5 degC above dew points is required.

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