Welding codes do not specify the shape of the annotation used in weld mapping. It is advisable to follow a company standard that helps the project team distinguish between weld numbers and item numbers. The weld number annotation style must also consider what shapes have already been utilized by the drawing to communicate item numbers and other such things. Most situations involving manual mapping utilize common shapes found on drawing stencils, the hexagon, circle, or square being the most common. The styles of annotations used for the weld numbering can vary between companies. In most cases, many data fields must be documented, which requires the standard two document, “map + log” approach. The disadvantage of this convenience is the ability to effectively track the progress of welds and maintain the cleanliness of documentation used to turnover to the client. This situation primarily exists in pipe spool fab shops or some structural shops. Embedding the log on the map can create a confusing situation for terminology, but this is still referred to as the weld map. In these cases, there may be a small table applied directly to the weld map, often in the area of the bill of materials. In these situations, the project requirements are minimal and may only require one or two properties to be associated with the weld. In some limited cases, weld details are included on the map, and no separate log is generated. The advantage of the weld log is that it documents the who, what, when, and how of the weld. The benefit of the weld map is that it creates the weld’s visual position on the map. Using both documents in tandem provides the most value. The numbered joints on a weld map correspond to the numbered rows of the weld log. The weld map is the foundational document for creating a weld log.

Pipeline isometric drawing pdf