What is the difference between a trenchless project for potable water, sewerage, stormwater, power or gas (on site practice)?

Q: What is the difference between a trenchless project for potable water, sewerage, stormwater, power or gas (on site practice)?

In practice, a trenchless project changes depending on the type of service because the requirements for safety, final testing, coordination with operators and commissioning risk change. In potable water, hygiene, disinfection and sampling protocols before commissioning are usually important. In sanitation, continuity of operation and flow management/compatibility with the existing network. In stormwater, hydraulic capacity and scheduling to avoid heavy rain windows and validate drainage performance. In energy and gas (and also telecom), the operator's permits and protocols are usually stricter, with supervision, work windows and traceability and documentation requirements. Therefore, in addition to the method, it is advisable to define from the beginning who approves, what tests are required and how the commissioning will be carried out.

In construction practice, a project NO trench changes significantly depending on the type of service because they change the safety requirements, final examinations, coordination with operators and the commissioning risk. These are the most common differences by type:

Drinking water

PriorityHygiene and sanitary protection (avoid contamination).
On siteGreater control of cleaning, pipe handling and connections to the existing network; close coordination with the operator for maneuvers and shutdowns.
Closing / commissioningusually requires disinfection, rinsing and sampling before going into service (according to the operator's standard). A widely used reference in the industry is the standard AWWA C651 on pipeline disinfection.
For context of water applications, you can see Urban supply systems.

Sanitation (wastewater)

PriorityHydraulic operation and continuity of service.
On siteThe following are the main focus of the flow management (if there are bypasses or temporary detours) and coordination so as not to compromise the operation.
ClosingThe following criteria are usually more important for acceptance criteria, such as inspection/validation of the section and compatibility with the existing network.
Related: Urban sewage systems.

Pluvial / drainage

PriorityEvacuation capacity and behavior in rainy episodes.
On siteThe programming usually avoids times/windows of risk (storms, heavy rains) and attention is paid to integration with spillways, wells and existing elements.
ClosingFunctional validation of the drain (that it “swallows” and connects as intended).
Related: Drainage works.

Energy and gas (and also telecom/fiber)

Priority: security, continuity of supply and operator's permits.
On sitemore weight of owner's protocols (supervision, work windows, traceability, signaling), and coordination to coexist with other services.
Closingdocumentation and operator acceptance are usually more “procedural” (traceability control, system testing according to internal standards).
When the service is linear and minimal disruption is sought, it usually fits well. Horizontal directional drilling (HDD) in many scenarios.

Key idea for purchasing/engineering

It is not only “trenchless method”: the service defines the work “package” (permits, final tests, operating windows and documentation). For this reason, before bidding/ awarding, it is advisable to establish who approves, what evidence is required y how it is put into service.