That is just for the presentation purposes but in actual normally there will positive or negative pressure depending on the height of tank and flow condition.
Question sir, if we closed the main isolation valve going to bldg. And also the up & downstream near the flowmeter. There will be a build up of pressure? It is safe? For zero flow
You have to make sure all equipment are rated above the maximum pressure of pump and prior to testing make sure that hydrotest was already conducted to the piping network.
I have a question: where can I find the code that shows "at 0% the pressure should not exceed 140% of the design pressure"? Is it NFPA 25? If it is, which chapter & section shows this regulation? Thanks
Thanks for your videos and appreciate your efforts .. General question how long we have to run for each condition and when we have to take reading while holding time if 0% at flow . & For 100 &150% flow if 10 minutes is a holding time
for Electric pumps at no flow (churn), you may run the pump 10mins. Please don't forget to no monitor the condition of pump e.g. temperature, weird noise, smoke from gland,.
Hi. This is a very strange test. Why is your suction pressure always 0 PSI? Do you have an underground tank and no low zone pump ? Normally, at 150% flow, for split case pumps D 400 mm NPSHR should be about 5 psi, to avoid cavitation. That being said, the suction pressure gauge reads about 4-5 psi. Without flow, the suction pressure should be equal to the liquid column pressure in the tank or the low zone pump pressure. How did you test the pump with no suction head?
This was just made to guide others how to conduct the testing. In actual situation, the suction line pressure will differ depending on the elevation of the tank or if the supply is coming from another pump.
@@adlearningofficialchannel6683 Yes, but colleagues may think that 0 PSI at suction means that the suction valve is closed. Everyone should be more careful and never close the suction valve
@@adlearningofficialchannel6683 Is this really safe? The electric pump has a cooling water flow valve (this valve opens when the pump is running with no water flow) and prevents the pump from overheating. The water flow through this valve is about 60 l/min. After 10 minutes there will be no water left in the suction pipe or in the pump and the pump will overheat. Why close the suction gate valve? What does it do?
@@romanroute7289 My apology for the confusion. Suction valves will be kept open during the testing. Only the isolation valve for the system will be kept closed and test line valve will be opened according to the flow requirement of the testing e.g. 100% or 150%.
@@adlearningofficialchannel6683 Exactly. The isolating valve and the test line valve can be completely closed for example during weekly tests without water flow for as long as you like, but it is imperative that the minimum water flow valve works correctly and is open when the pump is running and then the pump does not overheat. The suction valve must never be closed when the pump is running.
I have a question 1. Is it ok to put emergency generator for the electric fire pump in place of a diesel driven pump? 2. Example scenario "I will install Diesel Driven Fire Pump for the building. Is there any rule in NFPA or other standards that requires another installation of electric driven pump? Answers showing NFPA or other STANDARD provision is much appreciated... Thanks
That will depend on your local AHJ sir. You have to request clarification from them. In some countries it is required to have standby and duty. Standby shall be diesel pump otherwise provided with secondary power supply if electric driven.
@@adlearningofficialchannel6683 thank you for making clear video regarding performance test, however, how can you run a fire pump while your inlet and outlet valvles are totally closed? Is your pump will gonna explode?
@@sanosagara4507 thank you for appreciating my efforts Sir. inlet valves are in open condition and test line valves are opened in accordance with the flow requirement. Only the system valve is closed to isolate the system in the building.
