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what the hell is a "let by" test??? never heard of it,
also, I had no idea there was 3 types of connectons to lpg cylinders!!! i know of POL and QCC but what the hell is the 3rd one?
and what the hell is a thermal nut on a QCC regulator for???
i wont be suprised if i failed this exam as I never studied for this or knew it was going to be in the exam!!!!! bastards!!!
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Hey there
I sat that exam as well, mmm yeh there was a few quirky ones thats for sure. For the let by test I assume that referres to the gate valve or ball valve holding gas pressure. Ie if it were "letting by" loosing pressure this test would confirm this?.
The thermal nut regulator question was I guess for me, I know what it is, but its purpose is tricky.? How did you go on the self igniotion sketch? Full marks lol? I gave it my best shot, but yeh not sure too!
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what the hell is a "let by" test??? never heard of it,
also, I had no idea there was 3 types of connectons to lpg cylinders!!! i know of POL and QCC but what the hell is the 3rd one?
and what the hell is a thermal nut on a QCC regulator for???
i wont be suprised if i failed this exam as I never studied for this or knew it was going to be in the exam!!!!! bastards!!!
let by test = test to check that meter/valving closes properly enabling safe work on metered install - so if rise in pressure no go, drop in pressure ok but may indicate leak else where in system
is the 3rd type of connection the quick connect?
thermal nut melts and disconnects/closes off cylinder when gets too hot and risk of explosion?
if that is all you guys are worried about i am sure you will have done fine in the exam!
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A service valve "Let By" test - the purpose of a service valve let by test is to ensure that the service valve does not pass gas into the installation when in the closed position.
Procedure:
Ensure the service valve is turned off
Fit test piece to the meter test point
Connect apprpriate gauge to the test piece
Slowly open the service vavle to pressurise the pipework tot he working pressure
Close the service valve to isolate the gas supply
Bleed gas from the test piece isolation valve until the pressure drops to 50% of the working pressure
Shutt off the test piece bleed valve
Wait for two minutes (incoudes temperature stablisation)
If the pressure has not risen then the service valve has passed the "let by" test
If the pressure has risen then the sevice valve has failed the "let by" test and the network operator shall be notified. the netowrk operator shallr epair or silate the servive valve and the service valve "let by" test shall be repeated
Remove the test piece
Record test results
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I was on the right track, thanks jaxcat though, if only I could've recited that whole spiel in the exam......... ::)
Can anyone advance on the "sketch and label a self igniting burner" would this have been similar to the bosch califont models that dont require power to operate the ignition??
I dont think I got that one, but let me know what you guys make of that question?
Thanks
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Kozan clip on reg for the third type, let by test proves the integrity of an isolation valve by testing down stream and below inlet pressure of the valve and watch to see if the pressure climbs. Thermal nut melts in a fire and shuts down cylinder.......but hey f**** it I want a pair of those jeans man, bang on suiuan, dem pants are mean