Strange Sulfur Smell in Apartment: Gas Meter, Leak Checks, & Fluctuating Intensity Explained

Hello,

For some time now I have a strange smell in my apartment, it is a sulfur smell (more like matches rather than rotten eggs). The apartment has a gas meter in a cupboard, as it is an old block. Some time ago, there was a gas leak right at the meter, which was sealed and checked twice with a gas detector by professionals. The smell of sulfur is most noticeable around this cabinet. Concerned, I checked all the threads in the system with leak check foam again and nothing happened. I am concerned about the smell and have no idea what could be causing it. The interesting thing is that you can feel it stronger at times, and sometimes almost not at all. Does anyone have any idea what this could be?

From the so-called riser. I live on the 6th floor of a seven-story block of flats. At the front door there is a vertical gas pipe that goes through all floors and each apartment has a meter in the apartment. This smell hovers near the counter cabinet, but you don't smell sulfur in the cabinet itself.

I already had a gas leak in my apartment and the smell was not so obvious. The smell was simply "chemical" and since I have been renting it recently, I initially thought it was the smell of paint, new furniture, etc. The cabinet still had a specific smell inside, although it was checked with a detector and, according to the expert, there is no leakage. During the last review, when I drew the attention of a specialist to this smell, he said that if you smell it, there may be a vertical leak and that without exaggeration such amounts have not hurt anyone yet. In the summer I also had a problem with the backflow of exhaust gases from the chimney, but the draft is good and the ventilation grilles also have good draft, now it's ok.




Added after 16 [minutes]:

I will add that the carbon monoxide and gas sensors do not indicate anything. You only smell the stench. The same specialist sealed the installation for me and said it was ok, but it turned out that there was still a leak and he had to seal again. I do not trust him because he has also had other mishaps and he performs inspections throughout the block. After these transitions, the plans include liquidation of gas in the apartment, i.e. the meter.

Perhaps the cupboard is soaked with this smell? In my case, the gas cylinder also smells like gas, once there was a minimal leakage and the chipboard cabinet was soaked with this smell.

I've been thinking about that too. Today I'm doing a test and I turned off the gas for the day, I'll see if he can feel it. When it comes to the cabinet, when I go on vacation and the gas is closed for a week, for example, when I come back, I don't feel anything.

Then probably the valve needs to be replaced. Such valves do not sin durability.

For me, the description of the thread is somewhat reminiscent of "plumber's revenge" - I have a ventilation shaft at home, into which a sewage venting pipe enters (without aeration valves, etc.). When you do reverse thrust in the vent stack, the sewer stench (a bit like a matchstick) instead of sticking out above the roof wanders straight to my workshop, downstairs. Of course, the thrust in ventilation only "regresses" sometimes ...

The difference is that my friend lives in a block of flats, where probably no one would make such a mistake (inserting a sewage pipe for ventilation) ... However, it is worth considering whether there is a ventilation grille near the gas cabinet ...? Thrust is good ... but is it when it stinks? Does anyone live on the floor above? Maybe something stinks on him too?

There is no ventilation grille nearby, but it is a small studio, so everything is quite close together. I have not asked my neighbors yet, but if the problem persists, I will ask. Thanks for the hint. It's an old block and an old installation, so nothing will surprise me.

The specialist once again checked the gas with the detector and there was no leakage. He said the smell might be the smell of exhaust fumes. You don't feel anything from the stove, so probably from the outside. I live on the penultimate floor and either from the ventilation or through the window what comes out of the chimney comes in: /