API 16C Oil Transfer Hose Performance Specifications and Application Instructions
1. Overview of Petroleum Hose Grades
Petroleum transfer hoses are divided into three grades: Grade A, Grade C and Grade E based on pressure resistance standards. Each grade features differentiated core indicators including working pressure, minimum burst pressure and minimum bending radius, suitable for various working conditions such as oil and gas extraction, oil product transportation, dock loading and unloading, and factory oil transmission. The hose nominal sizes cover mainstream specifications from 2 inches to 6 inches, meeting the demands of small and medium-flow short-distance delivery as well as large-flow long-distance oil transmission.
The hoses adopt oil-resistant rubber composite structure, compatible with crude oil, refined oil, chemical oil and other media. Pressure gradients are clearly distinguished among grades: Grade A is a conventional low-pressure delivery type; Grade C is a medium-high pressure heavy-duty model; Grade E is an ultra-high-strength ultra-high-pressure petroleum hose designed for high-pressure oil transmission in oilfields. All specifications list inner diameter, outer diameter, rated working pressure, minimum burst pressure, minimum bending radius and reference weight per meter, facilitating pipeline selection, equipment layout and assembly matching.
2. Complete Specification & Performance Parameter Table
The table integrates all diameter sizes, pressure and bending performance data of Grade A, C and E. Pressure unit: PSI; dimension unit: inch/mm; bending radius unit: mm; weight unit: kg/m.
| Hose Grade | Nominal Size (in) | Inner Diameter (mm) | Outer Diameter (mm) | Working Pressure W.P. (PSI) | Test Pressure (PSI) | Min. Burst Pressure Min.B.P. (PSI) | Min. Bending Radius Min.B.R. (mm) | Reference Weight (kg/m) |
|---|---|---|---|---|---|---|---|---|
| Grade A | 2 | - | - | 3000 | - | 5000 | 800 | 4.3 |
| Grade A | 2 1/2 | 84 | - | 2000, 3000 | - | - | 950 | 5.6 |
| Grade A | 3 1/2 | 113 | - | 3000 | - | - | - | - |
| Grade A | 3 1/2 | 127 | - | 2000, 3000 | - | 5000 | 1200 | 14.0, 18.0 |
| Grade C | 3 | 119 | - | 4000, 6000 | - | 10000 | 1000 | - |
| Grade C | 6 | 162 | - | 4000 | - | 10000 | 1400 | - |
| Grade C | 5 | 164 | - | 7500 | - | 12500 | 1400 | 6.4 |
| Grade C | 6 | - | - | 7500, 5000 | - | 12500 | 1600 | 14.4 |
| Grade E | 3 | - | - | - | - | 11250 | - | 8.5 |
| Grade E | 3 1/2 | 185 | - | - | - | 18750 | 1600 | 20, 30 |
3. Working Condition Adaptation Features of Each Grade
3.1 Grade A Conventional Petroleum Hose
Grade A hoses have a maximum working pressure of 3000 PSI and a minimum burst pressure of 5000 PSI with sufficient safety margin. Nominal sizes range from 2 inches to 3.5 inches. With a small minimum bending radius, they allow flexible pipeline layout and lightweight structure. They are suitable for low-pressure scenarios including small dock loading/unloading, gas station oil pipelines and short-distance refined oil transmission in factories, and resist damage under frequent bending and equipment movement.
3.2 Grade C Medium-High Pressure Petroleum Hose
Grade C provides two working pressure options: 4000 PSI and 7500 PSI, with maximum minimum burst pressure up to 12500 PSI. A full range of large-diameter specifications from 3 inches to 6 inches are available. Large-diameter models match main transmission pipelines of large oil tank trucks and oil depots. With stronger pressure resistance than Grade A, they withstand instantaneous pressure surges during high-speed oil delivery, widely applied to ground gathering pipelines in oilfields and pipeline systems of large storage and transportation bases.
3.3 Grade E Ultra-High Pressure Petroleum Hose
Grade E is a special high-pressure model with minimum burst pressure ranging from 11250 PSI to 18750 PSI, far exceeding Grade A and C in burst strength. It adapts to harsh high-pressure conditions such as downhole oil outlet pipelines, high-pressure crude oil transmission and offshore platform oil transfer. Featuring higher structural strength, outstanding pulse and impact resistance, it serves long-term continuous high-pressure operation.
4. Core Key Points for Selection & Application
Pressure Matching: Select the corresponding grade according to actual pipeline working pressure. The actual operating pressure shall never exceed the rated working pressure of the hose to reserve sufficient burst safety margin.
Bending Control: The bending radius during pipeline installation shall not be smaller than the minimum value marked in the parameter table. Excessive bending will damage the internal reinforcement layer rapidly and shorten service life.
Diameter Matching: Small sizes (2~3.5 inches) are used for branch pipelines of medium and small equipment; sizes 5 and 6 inches act as main transmission pipelines to guarantee oil delivery flow.
Environmental Adaptability: The full series of petroleum hoses feature excellent oil resistance for long-term contact with various petroleum media, and resist conventional weather aging under outdoor open-air service.
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