It is mounted on the roof of the tank under the measuring hatch and ventilation pipe — the connecting link between the roof and this equipment.

The PZL pipe is installed on the roof of a vertical or horizontal tank and is used for mounting a measuring hatch of the LZ, through which level measurement and sampling are carried out, as well as for installing a ventilation pipe.
It consists of a pipe, connecting flanges on both sides and a reinforcing lining at the point of embedding in the roof. The main standard size is ПЗЛ-150 for the LZ hatch; a separate version is available for DN 50 for the ventilation duct.
| Type | Measuring hatch pipe |
|---|---|
| Purpose | Installation of the measuring valve hatch and ventilation pipe on the tank |
| Standard sizes | ПЗЛ-150 (under the LZ hatch), DN 50 (under the vent channel) |
| Composition | Pipe, connecting flanges, reinforcement plate |
| Installation location | Tank roof |
| Version | U/UHL, placement category 1 for ГОСТ 15150-69 |
| Material | Steel |
| Compatibility | Hatches measuring LZ ruler OnePROM |
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