FMVSS 303 PDF

The interior of the cabinet is mm long, mm deep and mm high. It has a glass observation window in the front, a closable opening to permit insertion of the specimen holder and a hole to accommodate tubing for a gas burner. For ventilation, it has a 13mm clearance space around the top of the cabinet, ten holes in the base of the cabinet, each hole 19mm in diameter and legs to elevate the bottom of the cabinet by 10mm, all located as shown in Figure 1. The interior dimensions of the U-shaped frames are 51mm wide by mm long. A specimen that softens and bends at the flaming end so as to cause erratic burning is kept horizontal by supports consisting of thin, heat resistant wires, spanning the width of the U-shaped frame under the specimen at 25mm intervals.

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Section Standard No. This standard specifies requirements for the integrity of motor vehicle fuel systems using compressed natural gas CNG , including the CNG fuel systems of bi-fuel, dedicated, and dual fuel CNG vehicles. The purpose of this standard is to reduce deaths and injuries occurring from fires that result from fuel leakage during and after motor vehicle crashes.

This standard applies to passenger cars, multipurpose passenger vehicles , trucks and buses that have a gross vehicle weight rating GVWR of 10, pounds or less and use CNG as a motor fuel. This standard also applies to school buses regardless of weight that use CNG as a motor fuel. High pressure portion of a fuel system means all the components from and including each CNG fuel container up to, but not including, the first pressure regulator.

General requirements. Each passenger car , multipurpose passenger vehicle , truck , and bus with a GVWR of 10, pounds or less that uses CNG as a motor fuel and that is manufactured on or after September 1, shall meet the requirements of S6, except S6. Each schoolbus with a GVWR greater than 10, pounds that uses CNG as a motor fuel and that is manufactured on or after September 1, shall meet the requirements of S6. The information shall be visible to a person standing next to the vehicle during refueling, in English, and in letters and numbers that are not less than 4.

The information shall be in English and in not less than 10 point type. Test requirements: fuel system integrity. Each vehicle with a GVWR of 10, pounds or less shall meet the requirements of any applicable barrier crash test. A particular vehicle need not meet further requirements after having been subjected to a single barrier crash test.

When the vehicle traveling longitudinally forward at any speed up to and including 30 mph impacts a fixed collision barrier that is perpendicular to the line of travel of the vehicle, or at any angle up to 30 degrees in either direction from the perpendicular to the line of travel of the vehicle, with 50th percentile test dummies as specified in part of this chapter at each front outboard designated seating position and at any other position whose protection system is required to be tested by a dummy under the provisions of Standard No.

When the vehicle is impacted from the rear by a barrier moving at any speed up to and including 30 mph, with test dummies as specified in part of this chapter at each front outboard designated seating position , under the applicable conditions of S7, the fuel pressure drop shall not exceed the limits of S5.

When the vehicle is impacted laterally on either side by a barrier moving at any speed up to and including 20 mph with 50th percentile test dummies as specified in part of this chapter at positions required for testing to Standard No. When the moving contoured barrier assembly traveling longitudinally forward at any speed up to and including 30 mph impacts the test vehicle schoolbus with a GVWR exceeding 10, pounds at any point and angle, under the applicable conditions of S7, the fuel pressure drop shall not exceed the limits of S5.

Test conditions. The requirements of S5 and S6 shall be met under the following conditions. Where a range of conditions is specified, the vehicle must be capable of meeting the requirements at all points within the range. The following conditions apply to all tests.

The gas pressure shall stabilize to ambient temperature before testing may be conducted. All manual shutoff valves are to be in the open position. If the vehicle has any high pressure electric shutoff valve that is normally open when the electrical system is activated, it is open at the time of the barrier crash.

Furthermore, if any electric shutoff valve prevents sensing of system pressure by the pressure transducer when closed, it must be open for both the initial pressure measurement and the pressure measurement 60 minutes after the vehicle ceases motion from impact. Any valve shall be open for a period of one minute to equalize the system pressure. Each dummy shall be restrained only by means that are installed in the vehicle for protection at its seating position.

The lateral moving barrier crash test conditions are those specified in S8. The rear moving barrier test conditions are those specified in S8. The barrier and test vehicle are positioned so that at impact - a The vehicle is at rest in its normal attitude; b The barrier is traveling at any speed up to and including 30 mph with its face perpendicular to the longitudinal centerline of the vehicle; and c A vertical plane through the geometric center of the barrier impact surface and perpendicular to that surface coincides with the longitudinal centerline of the vehicle.

The moving contoured barrier crash test conditions are those specified in S7.

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Federal Motor Vehicle Safety Standards

Section Standard No. This standard specifies requirements for the integrity of motor vehicle fuel systems using compressed natural gas CNG , including the CNG fuel systems of bi-fuel, dedicated, and dual fuel CNG vehicles. The purpose of this standard is to reduce deaths and injuries occurring from fires that result from fuel leakage during and after motor vehicle crashes. This standard applies to passenger cars, multipurpose passenger vehicles , trucks and buses that have a gross vehicle weight rating GVWR of 10, pounds or less and use CNG as a motor fuel. This standard also applies to school buses regardless of weight that use CNG as a motor fuel.

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