In the rooms of supply ventilation chambers,

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under the ceiling, in the walls and in the floor of living rooms, sleeping quarters of children's institutions, hospital wards, treatment rooms, dining halls, workrooms, administrative buildings, meeting rooms, auditoriums, libraries, classrooms, electrical panels and transformer rooms, control panels for automation, supply ventilation chambers and production facilities requiring special sanitary conditions;

under the ceiling (open or hidden) of kitchens, premises of public catering establishments, sales areas, warehouses of food products and valuable goods, lobbies, premises with valuable artistic design, production premises in places where industrial furnaces are installed, which are not allowed to be exposed to moisture, premises where valuable goods and materials are produced, the quality of which is reduced by exposure to moisture.

Note: it is permissible to skip drain risers if they are placed outside the air intake zone.

17.11. The sewer network should be connected with a flow break of at least 20 mm from the top of the receiving funnel:

technological equipment for the preparation and processing of food products;

equipment and sanitary appliances for washing dishes installed in public and industrial buildings;

pool drain pipes.

17.12. Domestic sewer risers located on the upper floors of buildings passing through public catering establishments should be provided in plastered boxes without the installation of inspection hatches.

17.13. The laying of pipelines for industrial wastewater in production and storage facilities of public catering establishments, in premises for receiving, storing and preparing goods for sale and in utility rooms of stores may be permitted to be placed in boxes without installing inspection hatches.

It is permitted to connect two separate outlets from industrial and domestic sewerage networks of stores and public catering establishments to one well of the external sewerage network.

17.14. To prevent inspections on risers with hidden installation, hatches of at least 30x40 cm in size should be provided.

17.15. The laying of drain pipes from devices installed in toilets of administrative and residential buildings, sinks and washbasins in kitchens, washbasins in medical offices, hospital wards and other utility rooms should be provided above the floor; in this case, it is necessary to provide for the installation of cladding and waterproofing.

17.16. The laying of pipelines under the floor that transport aggressive and toxic wastewater should be provided in channels that extend to the floor level and are covered with removable slabs or, if appropriately justified, in passage tunnels.

17.17. For explosion and fire hazardous workshops, a separate chinese student data sewer system with independent outlets, ventilation risers and hydraulic seals on each of them should be provided, taking into account the requirements of safety regulations specified in departmental standards.

Ventilation of the network must be provided through ventilation risers connected to the highest points of the pipelines.

It is not permitted to connect industrial sewerage systems transporting wastewater containing flammable and combustible liquids to the domestic sewerage system and drains.

17.18. Domestic and industrial sewerage networks that discharge wastewater into the external sewerage network must be ventilated through risers, the exhaust part of which is discharged through the roof or the building’s prefabricated ventilation shaft.