Products
Mixers
Technology
Resources
miltonroy-logo.jpg

Drag Reducing Agents (DRAs) are chemical additives injected into liquid pipelines to increase flow throughput by reducing frictional pressure losses. With decades of experience in severe‑duty chemical injection and a field‑proven design philosophy, Milton Roy has become the industry standard for pumping drag reducing agents in crude oil pipelines.

Milton Roy DRA pumping solutions deliver accurate, repeatable injection at critical points along the pipeline, ensuring optimal DRA performance while protecting the integrity of shear‑sensitive polymers. Our dosing systems are engineered to provide consistent control over injection rates, helping operators reduce turbulence, maximize hydraulic efficiency, and safely increase throughput under existing operating pressure limits.

The PRIMEROYAL and MILROYAL series positive displacement metering pumps are specifically suited for DRA service. Built to strict API 675 requirements, these pumps support a wide range of flow rates and discharge pressures to meet the demands of crude oil, refined products, and multiphase pipeline applications. Their robust construction, low‑shear hydraulic design, and exceptional metering accuracy make them a trusted choice for DRA injection worldwide.

To support customers throughout the entire lifecycle of their DRA systems, Milton Roy’s global service network provides local technical expertise, installation support, commissioning, and aftermarket service. Wherever your pipeline operates, Milton Roy ensures reliable performance and responsive support when and where it is needed.

Benefits of Drag Reducing Agents in Crude Oil Pipelines

Drag reducing agents provide an effective way to increase the capacity and efficiency of crude oil pipelines without requiring physical modifications to existing infrastructure. By reducing frictional pressure losses, DRAs allow higher flow rates to be achieved within the same operating pressure limits. Depending on pipeline design and operating conditions, throughput increases of 10 to 40 percent or more are commonly achieved, enabling operators to fully utilize installed assets.

Another major benefit is reduced energy consumption. Lower friction in the pipeline results in lower pump discharge pressures and reduced power demand at pumping stations. This leads to measurable operating cost savings, reduced fuel or electricity consumption, and lower mechanical stress on pumps and motors. Over time, these benefits also contribute to improved equipment reliability and longer maintenance intervals.

DRAs help operators defer or avoid capital‑intensive expansion projects. Instead of investing in new pipelines, additional pump stations, or looping infrastructure, operators can unlock latent hydraulic capacity within existing systems. Because DRA systems can be engineered and commissioned relatively quickly, they provide a faster and more economical path to capacity increases compared with large‑scale construction projects.

Operational flexibility is another key advantage of DRA usage. Injection rates can be adjusted in real time to accommodate changes in crude oil viscosity, seasonal temperature variations, or fluctuating throughput demands. DRAs can be injected continuously or selectively during peak periods, allowing operators to optimize performance while maintaining full control over operating costs. At typical ppm‑level dosages, DRAs do not materially affect crude oil quality or downstream refinery operations.

Drag Reducing Agents vs. Pipeline Looping

Drag reducing agents and pipeline looping are two common methods used to increase pipeline capacity, but they address different operational and economic objectives. DRAs provide a low‑capital, rapidly deployable solution that improves hydraulic performance by reducing internal friction losses. Pipeline looping, by contrast, increases capacity by constructing parallel sections of pipe, creating permanent physical expansion.

DRAs are generally preferred when capacity increases are required quickly or when future demand growth is uncertain. They involve minimal upfront capital investment and can be implemented in a matter of weeks or months rather than years. Because DRA injection is fully reversible, operators retain the ability to reduce or discontinue usage if market conditions change, making DRAs particularly well‑suited for brownfield pipelines that are mechanically sound but hydraulically constrained.

Pipeline looping is a long‑term infrastructure solution designed to deliver permanent capacity increases. While looping can exceed the ultimate capacity gains achievable with DRAs alone, it requires significant capital expenditure, extensive permitting, regulatory approvals, and right‑of‑way acquisition. Once commissioned, looped pipelines typically have lower incremental operating costs but lack the operational flexibility offered by chemical drag reduction.

In practice, many operators adopt a phased strategy by deploying DRAs to meet immediate or intermediate demand while evaluating or planning looping projects for long‑term growth. This approach enables rapid response to market conditions, earlier revenue realization, and improved capital discipline.

FAQ

A drag reducing agent (DRA) is a chemical additive—typically a high‑molecular‑weight polymer—that is injected at very low concentrations into flowing liquids such as crude oil, refined fuels, water, or multiphase streams to reduce frictional pressure losses inside pipelines. By lowering turbulence at the pipe wall, a DRA enables operators to increase throughput without increasing operating pressure, reduce pumping power and energy consumption, and extend the effective capacity of existing pipeline systems. DRAs deliver these benefits at parts‑per‑million dosage levels without changing the chemical composition of the transported product.

Milton Roy Solutions for Drag Reducing Agent Injection

Milton Roy offers a complete portfolio of pumping technologies engineered specifically for DRA injection service. Our PRIMEROYAL diaphragm metering pumps are ideal for applications requiring precise flow control, high reliability, and minimal shear exposure. For higher‑pressure or heavy‑duty applications, MILROYAL mechanically actuated diaphragm pumps provide exceptional durability and consistent metering performance under demanding pipeline conditions.

Both pump families are fully compliant with API 675, ensuring safe, repeatable, and accurate chemical injection. Their low‑shear hydraulic design helps preserve polymer integrity, maximizing DRA effectiveness and extending chemical life. Combined with Milton Roy’s expertise in system engineering, controls integration, and global aftermarket support, these solutions provide pipeline operators with confidence, efficiency, and long‑term value.