In a new facility, as opposed to having to route piping through an array of poorly located existing pipe and equipment, field fabrication of buttwelded pipe is not as efficient and cost effective as shop fabrication.

When welding has to be done in conditions that are not environmentally controlled then pre-heating will be required if the ambient temperature (not the metal surface temperature) is 0° F or below.

If the facility under construction is not enclosed then protection from the elements will have to be provided. Weather is arguably the biggest deterrent.The field routing installation of pipe through an array of insufficiently documented locations of existing pipe and equipment, on a retrofit project, is quite frequently more effective than attempting to pre-fabricate pipe based on dimensional assumptions.Fabricate-as-you-install reduces the rework risk assumed when pre-fabricating spools, or the cost related to field verification prior to shop fabrication.More efficient opportunity to fab around unexpected obstacles (structural steel, duct, cable tray, etc.).Reduced risk of damage to spool pieces.No time-consuming need to carefully crib, tie-down and chock pre-fabricated *spool pieces for transport to the job site.This is much easier to handle and store than multi-plane configurations of pre-fabricated pipe. Only raw material (pipe, fittings, valves, etc.) need to be shipped to the site location.

Type of project, size and scope of the project, pipe size and material, accessibility of the equipment, surface treatment after fabrication, weather conditions, availability of qualified personnel, time available to do the job, etc. The pipe is fabricated on-site, either directly at the place where it is mounted, or in a temporary accommodation in the field.Ī number of factors will determine whether it is profitable to fabricate pipe on site. Some contractors prefer to do most, if not all fabrication in the shop, others prefer to set up at the job-site, while others are flexible enough to utilize the best of both methods.įield fabrication and installation is exactly what it means. The installation of pipe can be accomplished in the following two primary ways, or combinations thereof. The installation of pipe systems follows its fabrication and is very frequently a part of it.

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