Page 137 - Trenchless Technology Piping Installation and Inspection

Coatings and Linings for Potable W ater Pipe Distributions 103

Test Method and
Standard Brief Description
Dry film thickness An electronic thickness gauge is used to measure
(ASTM D1186) the dry film thickness and compare with previously
obtained film thicknesses, so that changes due to
swelling and shrinkage can be measured to
+ 0.0254 mm (+ 1 mil) in accuracy.
Knife adhesion Cutting the lining through the existing pipe with a
(ASTM D6677) utility knife to probe adhesion. Adhesion is then rated
on a scale of 1–10 depending on the difficulty of
removal and size of the chips.
10–Lining difficult to remove.
01–Lining can be easily peeled.
Pull-off adhesion This test is also utilized to verify adhesion, cohesive
(ASTM D4541) strength, and pull-off strength of the lining system.
Undercreep holiday To determine the corrosion of the existing pipe when
(ASTM D1654) the lining is peeled off.
Blistering This test is used to evaluate the degree of blistering
(ASTM D714) that may develop when coated sample is subjected
to conditions, which will cause blistering. Blistering is
rated on the size and density of the blisters.
Lining impedance An accelerated procedure for determining
measurement comparative characteristics of lining systems applied
(ASTM G42) to pipe for the purpose of preventing corrosion
that may occur in service where the pipe will be
exposed to high temperatures and is under cathodic
protection. This test measures barrier properties of
the linings and coatings, and its permeability.

TABLE 3.3 Lined Pipe Testing Methods

3.12 Safety
In order to complete the work satisfactorily and accident free, it is the
responsibility of the contractor to be familiar with and follow all the
federal, state, and local regulatory safety requirements. All required
personal protective equipment (PPE) must be fully functional and
follow U.S. Occupational Safety and Health Administration (OSHA)
guidelines. Contractors need to identify all possible work hazards
[traffic management, pit excavation and protection (see Fig. 3.5), safe
disposal of extra lining materials (see Sec. 3.15), worker safety during
the existing pipe cleaning and liner installation, and so on] of lining
and submit a safety management plan to the project owner before
start of the lining operations.