Pipeline Replacement Through Existing Gas Corridor

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Project

Dubuque Pipeline Replacement
Location

Northern Illinois

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Background

A large natural gas distribution company required detailed engineering and design for a 30-inch, 8-mile pipeline replacement project located in northern Illinois.

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Challenges

The project posed a number of challenges. First, the pipeline was routed through an existing gas corridor in a heavily populated area. In addition, the existing 22” pipeline was replaced with a 30” pipeline, so a workaround had to be designed to accommodate this change.

Solutions

Because the pipeline was in a heavily populated area, the team worked closely with the client’s real estate group to ensure all landowner concerns were mitigated prior to construction. Additionally, proposed pipeline installation methods were adjusted to place equipment in less populated areas. The proposed pipeline was to be installed mainly within the existing local gas distribution company’s easement.

To accommodate the new 30” pipeline, the design had to take into account the existing 22” pipeline that was required to stay in service throughout construction. The designers developed a way to locate the proposed 30” pipeline within the existing easement. The replacement required precision locating by the survey and subsurface utility consultants to ensure the existing pipeline was accurately located both horizontally and vertically. Once the designers received this information, locating the proposed 30” pipeline in the easement was crucial to maintain sufficient clearances between the existing 22” pipeline and other third party utilities, while still maintaining the construction limits within the existing easement. Every effort was made to obtain additional temporary workspace where available to allow the contractors flexibility in construction for safety and cost effectiveness. The challenging 6-month project was completed on time and on budget.

“The replacement project required precision locating by the survey and subsurface utility consultants to ensure the existing pipeline was accurately located both horizontally and vertically.”

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Ohio Accelerated Main Replacement Program

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Project

Ohio Accelerated Main Replacement Program

 

Location

Cincinnati, Ohio

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Background

Our client, a large gas energy holding company, enlisted the services of EN Engineering to undertake a long-term, large-scale main replacement program in its Ohio service territory in order to improve the reliability, efficiency, and safety of their gas distribution system.

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Challenges

The long-term project included field noting to build a base map of existing conditions, and the creation of construction drawings that illustrated tie-ins and line of lay for the new gas mains.  Many of the replacements were in congested urban areas with a large number of existing utilities, which created design challenges.

Solutions

As part of an Accelerated Main Replacement Program (AMRP), the client replaced nearly 1,200 miles of 12-inch and smaller cast iron/bare steel gas main over 15 years. EN Engineering worked on the AMRP from 2007 through 2015, successfully completing the design and permitting for more than 400 miles within the aggressive schedule.

Each year throughout the project, the client requested that EN Engineering design additional footage based on the valuable experience, dependability, and the high quality work product provided. In addition, due to new efficiencies created by the team, EN Engineering dropped its fixed fee prices each year.

Based on the success of this program, EN Engineering earned a multi-year contract to submit permit applications for the renewal of 60,000 services throughout the client’s Ohio and Kentucky service territories as part of their Accelerated Service Replacement Program (ASRP) over the next ten years.

Within an extremely aggressive time frame, EN Engineering successfully completed the design and permitting of more than 400 miles of main replacement.

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Pipeline Expansion Project

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Project

Pipeline Expansion Project

Location

Northeastern Pennsylvania

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Background

A $143 million pipeline expansion project in northeastern Pennsylvania will allow the company to transport up to 135,000 dekatherms per day of additional firm natural gas capacity on its pipeline system. The pipeline expansion project will include installation of approximately 13 miles of 36-inch pipeline loop and associated facilities including a launcher, receiver, crossover valves, mainline valve with bypass and suction, and discharge connections at an existing compressor station.

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Challenges

The pipeline loop crosses the Lackawaxen River in northeastern Pennsylvania, a state which is highly focused on protecting their natural resources. The design had to meet the challenges presented by the river, and also receive approval from the state. The EN Engineering team worked alongside a number of federal and state agencies who were involved with the approval and oversight of the project, including the Federal Energy Regulatory Commission (FERC), U.S. Environmental Protection Agency (EPA), U.S. Army Corps of Engineers, and the Pennsylvania Department of Environmental Protection (PADEP) to develop a solution for this challenging environment.

Solutions

EN Engineering engineered, designed, drafted, procured, and created the necessary documents to install an 8.2 mile loop west of an existing compressor station, and a 4.71 mile loop east of the same compressor station. The new loop will tie into two existing pipelines on both sides of the compressor station. A mainline valve with a bypass and suction and discharge connections will be installed in the compressor station yard to allow compression by existing units. Working closely with the client, surveyor, and environmental firm, the EN Engineering team developed the necessary drawings for the pipeline loop crossing the Lackawaxen River. To meet federal, state, and local requirements, a more conservative crossing method – a dry open cut with a coffer dam – was required. By installing a coffer dam, the design team created a dry spot for construction. EN Engineering prepared a detailed analysis, including the advantages and disadvantages of the different crossing methods and demonstrated that a dry open cut, utilizing a coffer dam, was the most practical and preferred choice.

In addition, the team developed a detailed project schedule to ensure all parties were working towards the same goals for the FERC submittal date. The EN Engineering team collaborated with the ROW/land personnel to develop drawings to aid in negotiations with landowners impacted by the construction. EN Engineering also assisted the client with the procurement process by preparing purchase requisitions and Requests for Quotations (RFQ) segregated by category, to enable the client to submit requests for quotation in an orderly format.

Despite the challenges, the EN Engineering team successfully met deadlines for FERC submissions and bid drawings for potential contractors.

The new design and installation of the 13-mile pipeline expansion required approval from a number of federal and state agencies.

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