Prefabricated Piping Modules

Prefabrication moves piping work from a congested site into a shop with overhead cranes, controlled welding conditions and a flat floor. The schedule and safety case is well established. What decides whether it actually works is dimensional control.

Meritus sources prefabricated piping modules and skids from Chinese fabricators, with dimensional survey and shop testing treated as release conditions rather than paperwork.

Capabilities

Pipe rack and interconnecting modules
Process and utility skids
Pump, compressor and equipment skids
Spool prefabrication in carbon, alloy and stainless
Integrated E&I and insulation where transport allows
Dimensional survey against the model at hold points
Tie-in point position and orientation verification
Shop hydrostatic testing, flushing and preservation

Scope we cover

Pipe rack and interconnecting modules; process and utility skids; pump, compressor and equipment skids with integrated pipework; spool prefabrication in carbon, alloy and stainless grades; structural steel supporting frames; integrated instrumentation, electrical and insulation where the transport envelope allows.

Dimensional control

A module that is 40 mm out is a module that does not connect. We require dimensional surveys against the model at defined stages, check tie-in point positions and orientation specifically, and review the transport and lifting arrangement before release — including whether the module survives its own journey.

Shop testing

Hydrostatic testing, flushing and cleanliness verification are far cheaper in the shop than on site. We witness pressure testing, check cleanliness and preservation before shipment, and confirm that preservation actually survives the sea voyage — open flanges and missing desiccant are a recurring and avoidable cost. Every order runs through the same quality chain: shop pre-qualification, material traceability against mill certificates, in-process and final inspection, and a documentation pack released before shipment.

Failure modes we inspect for

Dimensional surveys against the drawing rather than the current model revision. Tie-in points at the right coordinates but the wrong orientation. Hydrostatic tests performed before final supports, so the tested configuration is not the shipped one. Flushing certified without cleanliness verification. And preservation adequate for a warehouse but not for a container in the tropics.

How an order runs

Enquiry and specification review; shop shortlisting against the actual scope rather than a general vendor list; quotation with the inspection plan priced in, not added later; kick-off with agreed hold and witness points; in-process inspection at those points; final inspection, document pack release and shipment; arrival support if anything is queried. For modules the release condition is a dimensional survey that reconciles to the current model revision, not to the drawing issued at enquiry.

Standards and certifications referenced

ASME B31.3
ASME Section IX (welding qualification)
AWS D1.1
ISO 8501 / ISO 12944
ISO 9001:2015

Frequently asked questions

What does prefabrication actually save?

Site labour, schedule and safety exposure. Welding and testing happen in a shop with cranes, controlled conditions and a flat floor, which is cheaper and produces more consistent quality than the same work performed in a congested site.

What is the main risk?

Dimensional control. A module that does not connect is expensive in a way that a badly welded spool is not, so tie-in accuracy is the primary deliverable.

How large can modules be?

Constrained by transport and lifting rather than by fabrication. The route, the vessel and the receiving crane determine the practical envelope, and that should be settled before the module is designed.

Is testing done before shipment?

Yes — hydrostatic testing, flushing, cleanliness verification and preservation, all witnessed, with the shipped configuration matching the tested one.

Request a Quote

Contact Meritus Technology's ISO 9001:2015 certified procurement desk in Shanghai for prefabricated piping modules — supplier verification, QA/QC, and global shipping. Request a quote or contact us.