Pipe Prefabrication

Our pipe fabrication shop is run by skilled union pipefitters using state of the art tools. We provide prefabrication of pipe assemblies from 2” to 16” diameter for:

  • Western Allied’s in-house projects
  • prefabrication services for local and out-of-state customers

Our typical fabrication is for hydronic steel piping 2” to 16” diameter, however larger sizes are possible. We specialize in welded and grooved systems. Our shop houses computerized CNC cutting machines, hydraulic positioners, grooving tools, and welding machines. Our highly trained and experienced personnel has created many reusable fixtures which not only save in set up time, but help ensure uniform quality.

If you are looking for quality prefabrication of pipe assemblies, give us a call. We will provide a quote based on detailed spool sheets which you will provide to us.

Why Choose Us.

Western Allied Corporation has been an industry leader in HVAC for over 60 years. Headquartered in Santa Fe Springs, CA, Western Allied is owned and operated by the industry’s most highly trained and qualifed personnel. Our facilities include in-house sheet metal and piping fabrication as well as proficiencies in stainless steel, black iron, galvanized, copper, PVC and other piping systems. We have a long and successful history of direct digital control (DDC) installation and support. We were the frst mechanical contractor to achieve LonWorks System Integrator status in Southern California.

Our mission is to foster a culture of knowledge, trust, and dependability within our company and implement those principles in our valued customer relationships. In addition, we strive to provide exceptional service through design, installation, and maintenance of HVAC systems.

Each of the partners at Western Allied is the head of a project team. Each team works with the company’s clients in order to see a project from inception to completion. This means that each team is responsible for; conceptual design, estimating, project management and project closeout and turnover. We feel that this structure is advantageous because it provides our clients with consistent points of contact throughout a project and ensures that an owner of Western Allied has direct involvement in and oversight of every project that the company is involved with.


We have been building HVAC systems for over 60 years. Nobody does it better.


Great technicians and by far the highest ratio of degreed engineers to field techs in the industry.


The leader in both generic and integrated LonWorks & BACnet controls in Southern California.


An art as much as it is a science. Proven engineering judgment produces value by expertly blending old with new.