Once an engineering work package is issued for construction its scope is frozen, and every change to it runs through a controlled process with an auditable record. The reason is downstream. Each EWP drives procurement sequencing and installation work packages, so a quiet drawing revision moves material, crews and the schedule.
Five Kinds of Change
The procedure sorts changes into five categories, and the category decides the paperwork.
Changes before IFC are internal. Drawing revisions, model updates, vendor data integration and the addition or voiding of a drawing are incorporated before release with no change notice, as long as controlled documents follow the contractor's management of change. Deleting a planned EWP at this stage still goes through the AWP lead, because the AWP Matrix is updated before anyone touches the schedule, the register or the AWP software.
Changes after IFC that stay inside the existing scope, such as a drawing revision, a model update, a vendor document revision or an added drawing, require an EWP change notice and a revised package.
Changes that grow or re-baseline scope, meaning new EWPs, scope moved between EWPs, or packages combined or split, are requested through the AWP lead, land in the matrix first, and then flow to the Level 3 schedule, material planning, the change notice, the new package, the review and the release.
Changes driven by safety or regulation, anything touching P&IDs, plot plans, process safety data, cause and effect diagrams, interlock logic or hazardous area classification, go through the full management of change workflow and process safety approval before any EWP is updated.
Changes raised from the field, through an RFI, a deviation notice or a variance, trigger a change notice whenever the engineering answer revises a drawing after IFC, along with updated IWPs and schedule and procurement adjustments. Every RFI names the affected EWP at submission, and the RFI log sits in the AWP software so each one is visible as a constraint on its CWPs and IWPs.
The Sequence After Approval
Every change gets an impact assessment covering scope, safety, engineering effort, construction, procurement, fabrication, schedule, cost, model and data changes, and alignment with the path of construction. Significant changes after IFC, taken as more than 25 hours of craft, need the owner's approval.
The change notice goes out before any revised drawing is published, through the document system, to construction management, superintendents, workface planners, procurement, fabrication, the owner's engineering team and project controls. The revised EWP is then transmitted as a complete package under a new revision number, every current document included, with a cover page that states the revision, the reason and each document that changed, was added, was removed or was placed on HOLD.
Transmittal is not the end of the revision. Workface planners revise the affected IWPs, and procurement and fabrication update their plans. The 3D model, the MTO, the piping files and the structural models are regenerated and reconciled against the revised drawings, and the master document register, the schedule, the data warehouse and the reporting all reflect the new revision. The AWP lead records the change in the EWP change log and updates the EWP Skyline. Only when all of that has been verified does the revision count as complete.
Running this process with an engineering contractor, from the categories to the log, is part of AWP consulting. The change log, the notices and the revised packages are the project's record of what changed and why, and they remain with the owner.