Efektivitas Metode Dual Shift Terhadap Percepatan Proyek Pemasangan Gate Valve Dalam Kondisi Online Service (Hot Tapping)

Abstract

Construction project planning requires close attention to time, cost, and quality as key
success factors. This study examines the installation of a gate valve and a bypass pipeline under online
service conditions using the hot tapping method on the Zamrud–Minas shipping line in Pekanbaru,
Riau. The project experienced delays due to design changes in the bypass route and technical
challenges during construction. To address these issues, the bypass was redesigned to improve fluid
distribution. A Work Breakdown Structure (WBS) was prepared to support structured management,
and rescheduling was conducted using the Precedence Diagram Method (PDM) to identify the critical
path. Crashing techniques were applied through a dual shift scenario. The analysis showed that the
normal schedule had the lowest direct cost of IDR 4,329,000,000, while dual shift required IDR
4,536,550,000 due to additional labor and material expenses. Indirect costs such as home and field
offices, temporary facilities, and insurance remained constant, but project tax increased with total
cost—IDR 476,190,000 (normal) and IDR 499,020,500 (dual shift). If project acceleration is highly
urgent, dual shift becomes the most suitable option, reducing the project duration from 170 days to 97
days, although with higher expenditure compared to the normal schedule.