We are about to carry out tightness
We are about to carry out tightness
(OP)
We are about to carry out tightness test of a Diesel Hydrotreater reaction section for newly constructed plant. The op.pr. is 125 kg/cm2 range.
To carry out tightness test of this system with NITROGEN, Make-up gas and Recycle gas compressors can provide max upto 42 kg/cm2 g pressure because of constraint on discharge temp with higher disch. pr. The valves on compressor for nitrogen service are also not designed for higher pressure.
We are planning to carry out tightness test with Nitrogen upto 42 kg/cm2 g pr. and then inject Hydrogen to carry out tightness test upto about 100 kg/cm2 g pressure.
However, our client is asking us to carry out tightness test with NITROGEN up to 100 kg/cm2 g pressure which is not possible with the compressor in the plant.
I would like to know if someone has an exp for carrying out tightness test with Nitrogen under these conditions. Is it really required to carry out tightness test above 42kg/cm2g pr with nitrogen?
Thnx in adv.
Nirav
To carry out tightness test of this system with NITROGEN, Make-up gas and Recycle gas compressors can provide max upto 42 kg/cm2 g pressure because of constraint on discharge temp with higher disch. pr. The valves on compressor for nitrogen service are also not designed for higher pressure.
We are planning to carry out tightness test with Nitrogen upto 42 kg/cm2 g pr. and then inject Hydrogen to carry out tightness test upto about 100 kg/cm2 g pressure.
However, our client is asking us to carry out tightness test with NITROGEN up to 100 kg/cm2 g pressure which is not possible with the compressor in the plant.
I would like to know if someone has an exp for carrying out tightness test with Nitrogen under these conditions. Is it really required to carry out tightness test above 42kg/cm2g pr with nitrogen?
Thnx in adv.
Nirav





RE: We are about to carry out tightness
I think you are talking about the leak test, correct me if I am wrong. For leak tightness, its a usual practice to test with a gas, say nitrogen with available pressure to find major leakages. Once the hydrocarbon gas is available at operating pressure, the test is repeated to find out any leak missed out in the first test. In your case, I don't think it is required to leak test with nitrogen at 100 kg/cm2g, as most of the leaks will be detected at 42 kg since gas has low viscosity and can escape easily.
Regards,
RE: We are about to carry out tightness
If you check the pressure drop at the operating pressure, you can exactly quantify the leakage. You can also extrapolate the values at lower pressure but tesing at higher pressure is a good idea.
Regards,
Believe it or not : A Neutrino is so mass less(and electrically neutral) that, a conservative estimate states, it can pass through a 50 light year thick lead block.
RE: We are about to carry out tightness
Yes, ixchawla. I'm talking about the leak test. In our other hydrotreater units also tht we supplied, the leak test was not carried out beyond compressor capacity.
The test by using cylinders is not feasible because of huge volume of the entire plant.
thnx again.
Nirav Kholiya
nirav-kholiya@enc.ltindia.com
www.lntenc.com
RE: We are about to carry out tightness
Regards ,
RE: We are about to carry out tightness
RE: We are about to carry out tightness
Fore safety, make sure that the pressure testing (say hydrotest) has been performed before putting such high pressure gas into the system.