What is a bump test on a motor?
A: A bump test is a functional test of a gas monitor. Sensors and alarm indicators are tested, ensuring acceptable performance of sensors and monitor before use. All sensors are challenged with a known quantity of gas, and instrument response is compared to the actual quantity of gas present.
What is a bump test?
So What’s a Bump Test? The ISEA defines a bump test as a. “qualitative function check where a challenge gas is passed over the sensor(s) at a concentration and exposure time sufficient to activate all alarm indicators to present at least their lower alarm setting.
How bump test is done?
To do this, put the gas detector into bump test mode, then apply the gas. The gas detector will either cycle through each individual sensor or do them all at once, depending on the gas detector’s settings. After the test is complete, the monitor will display results, showing whether it passed or failed the bump test.
What is compressor bump test?
In this test, usually performed after an electric motor has been replaced and reconnected, the motor’s motor starter is quickly started to observe the direction of rotation of the electric motor output shaft to be sure it is running in the proper direction.
What is bump test in vibration?
A bump or rap test is a simple repeated impact test applied to a machine or product to excite the structure. This allows you to measure its natural frequencies. A bump test is carried out to determine if resonance is responsible for high noise or vibration levels.
Is bump testing required?
In a written letter to Major Safety, RKI says: We do not feel that daily bump testing of our portable instruments is necessary or useful in most situations if the instrument is calibrated once per month. For those customers that might insist on doing a bump test, we recommend no more frequently than once per week.
How often should you do a bump test?
Calibration is only necessary if bump testing indicates the sensor is out of specification. Electrochemical sensors tend to drift over time and require bump testing every 3 to 6 months. Calibration is recommended annually or if bump testing indicates an out of spec sensor.
How often should you perform a bump test?
Electrochemical sensors tend to drift over time and require bump testing every 3 to 6 months. Calibration is recommended annually or if bump testing indicates an out of spec sensor. Due to the technology of electrochemical sensors, they will deplete over time and more rapidly if exposed to the target gas.
What is trip speed compressor?
The trip speed is 115% of MCS speed, and MCS speed is the highest rotor speed which designed and tested and capable of continuous operation. After this 15 min, the rotor speed is reduced to the 100 MCS and compressor runs for 4 hours.
What is vibration test?
In vibration testing, the vibration environment to which products will be exposed to in real use is reproduced. Products are tested in this environment to judge their durability or check for improvements.
What is the frequency of pump check?
Mid- to High-Frequency Monitoring Many pump vibrations are directly related to the running speed of the pump (or multiples of the running speed) and the motor drive system. These vibrations occur in the mid- to high-frequency range of 450 to 60,000 cpm (7.5 to 1,000 Hz).
How long does a bump test take?
How long does a bump test take? Most tests take 15-20 seconds per instrument.
What is the difference between a bump test and calibration?
A: A bump test is a very brief exposure of a monitor to a gas to help verify that the sensors respond and the alarms are functioning. A calibration is performed by exposing the monitor to a certified concentration of gas for a given time to help verify it provides an accurate reading.
What is POR and AOR in vibration?
POR = Preferred Operating Region. AOR = Allowable Operating Region. Figure 32 – Locations for taking vibration readings on vertically suspended (VS) pumps.
How often should you bump test?
What is K in vibration?
The constant of proportionality k is the spring constant or stiffness. Mass. A mass is a rigid body (Fig. 2.2) whose. acceleration ¨x according to Newton’s second law is.
What is the bump test value of your motors?
We often find different bump test values across our motors in respect to inboard (belt tension increasing stiffness) and outboard end. The thing is, is the bump value within 10 to 20% of a forcing frequency. I am not sure of what you mean by the bump value within 10 to 20% of a forcing frequency?
What is a bump test on a gas meter?
A bump test, also known as a function check, is a routine test used to confirm that a direct-reading portable gas-monitoring (DRPGM) device is able to detect and alarm when its sensor is exposed to a sufficient amount of the gas the device is built to detect.
Should motor be ready for service before bump test?
The bump test is generally done to ensure you got phase rotation on the motor correct ie motor turns the right direction. After this we generally put it on line and if ran OK put it in service. SO the answer is yes you should have the thing ready to go in all respects before bump test. Barry1961 is right.
What is the point of a bump test?
Generally the point of the “bump test” is to insure that all of the motors are working. I typically bump one at a time, because it is very difficult to catch one not running in such a quick span.