Entrained Gas Tester Manual

Thread481-348164 mcm1209 (Petroleum) (OP) 8 Jul 13 9:13 Guys I am working for a pipeline construction company. I have been in the process and pipeline services since 1999. I joined this company to start a hydrotest division. We are being asked by our customer to conduct a pneumatic test of 7 miles of 20\' pipeline. Test pressure is somewhere in the neighborhood of 1300 psi. I am very opposed to this but my company wants to push forward. The customer has given us the green light.

Oh yeah We are doing this test within the week. I need hard facts to stop my company from doing this. I have been looking for info on the net but have not been able to find something concrete. Or facts so i feel better about this. I did find \'437.4.3 Only allowed for piping systems operated at 20% or less of SMYS\' Need help This question is generally followed immediately by something like.

Whether the car is just hesitating when you hit the gas or actually stalling at inappropriate times, the source of the problem is easier to narrow down when you know what the output is. A four-gas analyzer reads emissions for four separate gases: oxygen, carbon dioxide, carbon monoxide, and hydrocarbon.

Thread378-191668 JoeTank (Structural) 9 Jul 07 9:12 My personal practice for an air test is to be at least one zip-code away from the site. Joe Tank Which is pretty funny and quite memorable. That pneumatic tests are irresponsible and anyone who proposes one is a cowboy. While it is right and proper that we have a strong bias in favor of hydrostatic testing over testing with compressed gases, testing with compressed gas testing is far from irresponsible and can be the lower risk alternative in certain specific cases. The risk being talked about here is that pressurized gas contains significantly more potential energy than pressurized incompressible liquid. Rapidly converting this potential energy to kinetic energy can be a violent and destructive event.

Strength Testing for Pipelines When new piping is to be placed in service, various codes and company standards require that it be subjected to a leak test and/or a strength test. Leak tests are generally done at fairly low pressures and are only intended to prove that the pipe will in fact contain the fluids. Risks are generally reasonably low and leak tests are done without much consideration of catastrophic failure.

The strength test is done with elevated pressure at some multiple greater than 1.0 of the system maximum allowable working pressure (MAWP) and held for some length of time. The pressure multiple and time duration vary considerably from one regulatory jurisdiction to another, from one code document to another, and from one company to another. Those details, while liberally sprinkled in posts on this topic are outside the scope of this discussion. The primary kinds of tests are \'Hydrostatic\' or \'pneumatic static\' (sometimes called \'pneumostatic\' but that is just too pretentious). The \'static\' simply means that during a successful test the fluids under pressure have no net movement relative to a pipe end or the pipe centerline. A hydrostatic test is done using a largely incompressible fluid like water (hence the prefix \'hydro\'), oil, glycol, or some mixture (e.g., glycol is often added to hydrostatic-test water to prevent freezing).

Thread481-348164 mcm1209 (Petroleum) (OP) 8 Jul 13 9:13 Guys I am working for a pipeline construction company. I have been in the process and pipeline services since 1999. I joined this company to start a hydrotest division. We are being asked by our customer to conduct a pneumatic test of 7 miles of 20\' pipeline. Test pressure is somewhere in the neighborhood of 1300 psi. I am very opposed to this but my company wants to push forward. The customer has given us the green light.

Oh yeah We are doing this test within the week. I need hard facts to stop my company from doing this. I have been looking for info on the net but have not been able to find something concrete. Or facts so i feel better about this. I did find \'437.4.3 Only allowed for piping systems operated at 20% or less of SMYS\' Need help This question is generally followed immediately by something like.

Whether the car is just hesitating when you hit the gas or actually stalling at inappropriate times, the source of the problem is easier to narrow down when you know what the output is. A four-gas analyzer reads emissions for four separate gases: oxygen, carbon dioxide, carbon monoxide, and hydrocarbon.

Thread378-191668 JoeTank (Structural) 9 Jul 07 9:12 My personal practice for an air test is to be at least one zip-code away from the site. Joe Tank Which is pretty funny and quite memorable. That pneumatic tests are irresponsible and anyone who proposes one is a cowboy. While it is right and proper that we have a strong bias in favor of hydrostatic testing over testing with compressed gases, testing with compressed gas testing is far from irresponsible and can be the lower risk alternative in certain specific cases. The risk being talked about here is that pressurized gas contains significantly more potential energy than pressurized incompressible liquid. Rapidly converting this potential energy to kinetic energy can be a violent and destructive event.

Strength Testing for Pipelines When new piping is to be placed in service, various codes and company standards require that it be subjected to a leak test and/or a strength test. Leak tests are generally done at fairly low pressures and are only intended to prove that the pipe will in fact contain the fluids. Risks are generally reasonably low and leak tests are done without much consideration of catastrophic failure.

The strength test is done with elevated pressure at some multiple greater than 1.0 of the system maximum allowable working pressure (MAWP) and held for some length of time. The pressure multiple and time duration vary considerably from one regulatory jurisdiction to another, from one code document to another, and from one company to another. Those details, while liberally sprinkled in posts on this topic are outside the scope of this discussion. The primary kinds of tests are \'Hydrostatic\' or \'pneumatic static\' (sometimes called \'pneumostatic\' but that is just too pretentious). The \'static\' simply means that during a successful test the fluids under pressure have no net movement relative to a pipe end or the pipe centerline. A hydrostatic test is done using a largely incompressible fluid like water (hence the prefix \'hydro\'), oil, glycol, or some mixture (e.g., glycol is often added to hydrostatic-test water to prevent freezing).