Page 148 - Trenchless Technology Piping Installation and Inspection

114 Cha pte r T h ree

3.17 Installation Procedures
Table 3.9 presents the steps for installation of spray-on coatings and
linings. Figure 3.12 presents the schematic view of lining-installation
process.

Steps Tasks Objectives & Considerations
1 Project Planning • Evaluate surface and subsurface conditions:
A. As-built drawings
B. Crossing and nearby utilities
C. Job site access and restrictions
D. Traffic management
E. Storage and laydown area
F. Soil conditions
2 Locating • Evaluate number of valves, bends and fittings
Appurtenances • Locate the entry and exit pits
3 Excavating Pits • Excavate and protect entry and exit pits
4 Pre-cleaning • Check the level of cleaning required
Inspection
5 Cleaning • Remove corrosion, sediments, debris and
standing water
6 Post-cleaning • Check for leaking joints, valves, fittings,
Inspection pinholes and missing pipe sections, if any
7 Lining • Verify lining mix ratio, material temperature, and
Preparation pump output as required by liner manufacturer
8 Lining • Monitor the flow rate and the retrieval
Installation speed of the spray head
• The speed of the spray head must be
slow-enough to produce a uniform liner as
required per specifications
9 Capping Lined • Prevent the contamination of and/or water
Pipe from entering the pipe by capping the ends
of the lined pipe
10 Curing • Cure lining as required per specifications
11 Testing • New fixture valves are installed and the
system is tested to ensure no water leaks
remain and that water pressure has been
restored
12 Post-lining • Verify quality of the lining work and inspect
Inspection the lined pipe
13 Disinfecting • Disinfect the lined pipe with one of the
Lined Pipe methods described in Sec. 3.9
14 Restoring Water • Establish connections, appurtenances, and
Service job closeout

∗ Refer to Sec. 3.16.1 for detailed installation procedure of cement-mortar lining.
TABLE 3.9 Installation Steps for Spray on Coatings and Linings ∗