GB 50015-2019Standard for design of building water supply and drainage (English PDF)

1.0.1

This standard is formulated to ensure the design quality of building water supply and drainage engineering and meet the basic requirements of safety, sanitation, applicability, economy, and greenness.

1.0.2

This standard is applicable to the domestic water supply and drainage of civil buildings, industrial buildings and communities, as well as the rainwater drainage engineering design of communities.

1.0.3

When the height of the building exceeds 250m, the design of the water supply and drainage system of the building shall not only comply with the provisions of this standard, but also carry out special research and demonstration.

1.0.4

The water supply and drainage design of buildings shall not only meet the requirements of use, but also provide convenient conditions for construction installation, operation management, maintenance inspection and safety protection.

1.0.5

The design of building water supply and drainage engineering shall not only implement this standard, but also comply with the current relevant national standards.

2.1 Terminology

2.1.1 drinking water

The water quality meets the national sanitary standards for drinking water and is used for daily drinking, washing and other domestic water.

2.1.2 Domestic miscellaneous water non-drinking water

Non-drinking water used for flushing toilets, washing cars, watering roads, watering greenery, replenishing air-conditioning circulating water and landscape water bodies, etc.

2.1.3 secondary water supply

When the water pressure and water volume requirements for domestic drinking water in civil and industrial buildings exceed the capacity of urban public water supply or self-built water supply pipe network, the water supply method is supplied to users or self-use through pipelines through storage, pressurization and other facilities.

2.1.4 hourly variation coefficient

The ratio of the maximum hourly water consumption to the average hourly water consumption.

2.1.5 maximum hourly water consumption

The hourly water consumption during the maximum daily maximum water consumption period.

2.1.6 average hourly water consumption

Average hourly water usage during the period of highest daily water usage.

2.1.7 Backflow pollution

Pollution of domestic water systems by back-pressure backflow or siphon backflow.

2.1.8 Back-pressure back flow

Due to the change of the downstream pressure of the water supply system, the water pressure at the water end is higher than the water pressure at the water supply end.

2.1.9 Siphon back flow siphonage back flow

The negative pressure in the water supply pipeline causes the water or liquid mixture in the sanitary appliance and the water receiving container to flow back into the domestic water supply system.

2.1.10 air gap

In the water supply system, the vertical space distance between the lowest point of the pipe outlet or the outlet of the faucet and the overflow water level of the water-using equipment; in the drainage system, the lowest point of the discharge nozzle of the indirect drainage equipment or container and the overflow water The vertical space distance between bits.

2.1.11 flood-level rim

The upper edge of the appliance overflow.

2.1.12 backflow preventer

A device composed of non-return components that can prevent backflow of water in the water supply pipeline.

2.1.13 vacuum breaker

It is a device that can introduce atmospheric pressure to eliminate the backflow of water flow in the water supply pipe due to siphon.

2.1.14 Introduce service pipe

The pipe section that is introduced from the municipal pipeline to the residential water supply network, or the pipe section that is introduced into the building from the residential water supply pipe.

2.1.15 Take over the inter-building pipe

The water supply and drainage pipes arranged around the building and directly connected with the building inlet pipe or discharge pipe.

2.1.16 Inlet pipe

The section of the domestic water supply pipe that is supplied separately from the water supply system to each household.

2.1.17 Vertical division zone

The building water supply system is divided into several water supply areas at vertical heights.

2.1.18 Parallel water supply

Each vertical water supply zone of the building has an independent pressure increase (decrease) system for water supply.

2.1.19 Series water supply

The method of increasing (decreasing) pressure water supply in series for each vertical water supply zone of a building.

2.1.20 superposed water supply pressure superposed water supply

The water supply equipment directly absorbs water and pressurizes the water supply method from the pressurized water supply pipe network.

2.1.21 Specify exposed installation

The method for the exposed layout of indoor pipes.

2.1.22 concealed installation, embedded installation

Indoor pipes are arranged in wall pipe grooves, pipe wells or pipe trenches, etc., or concealed by architectural decoration.

2.1.23 Manifold

Pipe fittings for multi-branch lines.

2.1.24 Self-provided water source

Water sources other than domestic drinking water provided by the urban water supply network.

2.1.25 plumbing fixture, fixture

A container or device that supplies water and receives and discharges waste water or dirt.

2.1.26 Equivalent fixture unit of sanitary ware

Based on the flow rate (water supply flow or drainage flow) value of a certain sanitary appliance, the ratio of the flow rate (water supply flow or drainage flow) value of other sanitary appliances to it.

2.1.27 rated flow nominal flow

The volume of water flowing out of the water distribution outlet of sanitary ware per unit time under the specified working pressure.

2.1.28 design peak flow

In the design of the domestic water supply pipeline system of a building, the maximum instantaneous water supply flow rate during the peak water consumption period according to the water supply equivalent of the sanitary ware supplied by it, the number of users, and the water consumption law is taken as the design flow rate of the pipe section, which is called the water supply design second flow rate, and its measurement unit is usually Expressed in L/s.

When designing the drainage pipeline inside the building, the instantaneous maximum drainage flow generated in the drainage pipe section according to the number of indoor sanitary appliances, drainage equivalent and drainage law is taken as the design flow of the pipe section, which is called the drainage design second flow rate, and its measurement unit is usually L /s said.

2.1.29 head loss

Energy consumption caused by water passing through pipes, equipment, structures, etc.

2.1.30 Pneumatic water supply

It consists of a water pump, a pressure tank and some accessories. The water pump presses water into the pressure tank, and relies on the compressed air pressure in the tank to automatically adjust the water supply flow and maintain the water supply pressure.

2.1.31 points of distribution

A water point in a water supply system.

2.1.32 Circulating period

The ratio of the effective water volume in the structures and pipelines of the circulating water system to the circulation volume per unit time.

2.1.33 backwash

When the filter material layer intercepts the dirt to a certain extent, use a strong water flow to reversely wash the filter material.

2.1.34 Stabilization treatment of water quality-ity

It is a water treatment process used to keep the concentration of calcium carbonate and carbon dioxide in the circulating cooling water in a balanced state (neither scaling due to calcium carbonate precipitation nor corrosion due to its dissolution), and to inhibit the growth of microorganisms.

2.1.35 cycle of concentration

The ratio of the salinity concentration of circulating cooling water to the salinity concentration of make-up water.

2.1.36 Self-priming

When the pump is started, the water is filled into the pump body by gravity.

2.1.37 Waterscape, fountain

Man-made water landscape.

2.1.38 Hydrophilic waterscape

The dynamic waterscape that produces floating particles and water mist will contact organs and be inhaled into the human body.

2.1.39 domestic sewage

Fecal sewage excreted in people's daily life.

2.1.40 domestic wastewater

Washing water discharged from people's daily life.

2.1.41 Sanitary wastewater

The general term for domestic sewage and domestic wastewater discharged by people in daily life.

2.1.42 discharge pipe building drain, outlet pipe

The drainage horizontal pipe section from the inside of the building to the outdoor manhole or drainage ditch.

2.1.43 Vertical pipe, riser, stack

Water supply and drainage pipes that are vertical or have an angle of less than 45° with the vertical.

2.1.44 Horizontal pipe

Pipes that are horizontal or have an angle of less than 45° with the horizontal. Among them, the pipe section connecting the appliance drain pipe to the drainage standpipe is called the horizontal branch pipe, and the pipe section connecting several drainage standpipes to the discharge pipe is called the horizontal main pipe.

2.1.45 Appliance drainage pipe fixture drainage

The drainage pipe section from the outlet of the sanitary ware trap to the joint of the horizontal branch pipe of the drainage.

2.1.46 Cleanout

Fittings for clearing the drainpipe on the horizontal drainpipe.

2.1.47 check hole, check pipe

A fitting with an openable inspection cover installed on the drain standpipe for inspection and clearing.

2.1.48 Water trap

A fitting with a water seal inside a sanitary appliance or on the outlet of the appliance.

2.1.49 water seal

There is a certain height of water column in the appliance or pipe section to prevent the gas in the drainage pipe system from entering the room.

2.1.50 H pipe

A special fitting for connecting the drain standpipe and the vent standpipe in the shape of an H.

2.1.51 air admission valves

Vent pipe attachments that allow only air to enter the drain system and not allow odors to escape from the drain system.

2.1.52 vent pipe, vent

The pipeline connected with the atmosphere is set up to make the air circulate in the drainage system, stabilize the pressure and prevent the damage of the water seal.

2.1.53 stack vent

The connection between the drainage standpipe and the uppermost horizontal drainage pipe extends upwards to the pipe section for outdoor ventilation.

2.1.54 Specific vent stack

A vertical ventilation duct that is connected only to the drain riser and provided for air circulation in the drain riser.

2.1.55 Confluence vent headers

Connect several ventilation standpipes or the ventilation part at the top of the drainage standpipe, and extend to the outdoor ventilation pipe section connected to the atmosphere.

2.1.56 Main vent stack

It is arranged on the same side of the drainage riser, connecting the circular ventilation pipe and the drainage riser, and is a vertical pipe set for the air circulation in the drainage horizontal branch and the drainage riser.

2.1.57 Secondary vent stack, assistant vent stack

It is installed on different sides of the drainage standpipe and is only connected to the circular ventilation pipe. It is a ventilation riser set up for the air circulation in the drainage horizontal branch pipe.

2.1.58 oop vent

The ventilation pipe section connected from the first two sanitary appliances on the drainage horizontal branch pipe of multiple sanitary appliances to the main ventilation riser or auxiliary ventilation riser, or connecting the appliance ventilation pipe to the main ventilation riser or auxiliary ventilation riser vent pipe section.

2.1.59 Appliance ventilation pipe fixturevent

The pipe section where the outlet of the plumbing fixture trap is terminated to the annular vent pipe.

2.1.60 yoke vent

The connecting pipe section between the drainage riser and the ventilation riser.

2.1.61 Self-circulation ventilation self-circulation venting

The ventilation standpipe is connected to the drainage standpipe at the top and between layers, and connected to the discharge pipe at the bottom. The positive and negative pressures generated in the pipeline during the drainage process are detoured through the connected ventilation pipes to achieve a balanced ventilation method.

2.1.62 Indirect drainage indirect drain

Drain pipes from equipment or containers are not directly connected to the drainage system with an air gap in between.

2.1.63 same-floor drainage

The drainage horizontal branch pipe is arranged on this floor, and the appliance drainage pipe does not pass through the floor drainage method.

2.1.64 Covered depth

The vertical distance from the top of the buried pipeline to the ground surface.

2.1.65 buried depth

The vertical distance from the inner bottom of the buried drainage pipe to the ground surface.

2.1.66 angle of turning flow

The angle between the original flow direction of the water flow and its changed flow direction.

2.1.67 Fullness depth ratio

The fullness of the water flow in the pipe channel is expressed by the ratio of water depth to pipe diameter for pipes, and the ratio of water depth to channel height for channels.

2.1.68 Grease tank

A small treatment structure that separates and traps grease in domestic wastewater.

2.1.69 Grease interceptor

A finished device for separating and trapping grease in domestic wastewater.

2.1.70 cooling tank

Small treatment structures that reduce the temperature of the effluent.

2.1.71 septic tank

A small treatment structure that separates and settles domestic sewage and performs anaerobic digestion of sludge.

2.1.72 reclaimed water

All kinds of domestic drainage are treated to meet the specified water quality standards and reused water.

2.1.73 medical organization sewage

Diagnosis and treatment, domestic and fecal sewage discharged from outpatient clinics, wards, operating rooms, various inspection rooms, pathological anatomy rooms, radiation rooms, laundry rooms, mortuaries, etc. of medical institutions.

2.1.74 sewage lifting device

It integrates sewage pump, water collection tank, pipeline, valve, liquid level gauge and electrical control, and is a finished device for sewage lifting.

2.1.75 time of air change

The ratio of the air supply or exhaust volume of the ventilation system to the volume of the indoor space per unit time.

2.1.76 Rainfall intensity

The amount of rainfall per unit time. It is commonly used in engineering to measure the rainfall volume per unit area per unit time, and its measurement unit is usually expressed in L/(s·hm2).

2.1.77 recurrence interval

After statistical analysis of rainfall observation data for a certain period of time, the average interval time between occurrences of rainfall greater than or equal to a certain rainstorm intensity, and its unit is usually expressed in a.

2.1.78 duration of rainfall

Any continuous period in the rainfall process.

2.1.79 surface water collection time inlet time

The time for rainwater to flow from the surface of the furthest point of the corresponding catchment area to the entrance of the rainwater pipe canal is referred to as the catchment time.

2.1.80 time of flow

The time when rainwater is popular in the pipe canal, referred to as the popular time.

2.1.81 catchment area

The area where rainwater pipes collect rainfall.

2.1.82 gravity rain drainage system

Roof rainwater drainage system with pipes designed for gravity unpressurized flow.

2.1.83 full pressure storm sys-tem

The roof rainwater drainage system is designed according to the negative pressure suction drainage generated by the full pipe flow.

2.1.84 gulley, gutter inlet

A grated catchment that directs surface rainwater into a storm sewer.

2.1.85 linear drainage ditch

Drains that continuously collect ground rainwater along the way.

2.1.86 downspout, leader

Laid on the outside of the building's exterior wall, it is a drainage riser for draining rainwater from the roof.

2.1.87 hanging pipe

Rainwater horizontal pipes suspended under roof trusses, floor slabs and beams or overhead on columns.

2.1.88 Rainwater bucket roof drain

A device that directs rainwater from the roof of a building into a rainwater riser.

2.1.89 runoff coefficient

The ratio of runoff rainfall to rainfall for a certain catchment area.

2.1.90 central hot water supply system

A system that supplies one (excluding a single villa), several buildings, or one or more functional departments in a multi-functional single building.

2.1.91 all day hot water supply system

A system for the uninterrupted supply of hot water throughout the day, work shift or business hours.

2.1.92 fixed time hot water supply system

A system that supplies hot water during a certain period of time throughout the day, work shift or business hours.

2.1.93 local hot water supply system

It is a system for supplying hot water for single villas, single households in houses, single toilets in public buildings, single kitchen restaurants or shower rooms.

2.1.94 open hot water supply system

A hot water supply system in which the hot water pipe system communicates with the atmosphere.

2.1.95 closed hot water supply system

A hot water supply system in which the hot water piping system is not connected to the atmosphere.

2.1.96 single line hot water system, tempered water supply system

A hot water supply system that uses a pipe to directly supply hot water at the temperature required by the water distribution point.

2.1.97 heat pump hot water supply sys-tem

A hot water supply system that uses a heat pump unit to prepare and supply hot water.

2.1.98 water-source heat pump

A heat pump that uses water or an aqueous solution with antifreeze as a low-temperature heat source.

2.1.99 Air-source heat pump

A heat pump that uses ambient air as a low-temperature heat source.

2.1.100 heat source

Energy for producing hot water or heat medium.

2.1.101 heat medium

Heat transfer carrier, usually hot water, steam, flue gas.

2.1.102 Waste heat

The waste heat emitted during the production process, such as the heat emitted by waste steam, high-temperature wastewater (liquid), high-temperature flue gas, etc.

2.1.103 Solar fraction guaranteed rate of solar energy

The ratio of the heat provided by solar energy in the system to the total heat consumption of the system throughout the year.

2.1.104 solar irradiation

The areal density of solar radiation received.

2.1.105 fuel oil (gas) hot water unit fuel oil (gas) hot water device

It is an equipment assembly composed of a burner, a water heating furnace body and a fuel (gas) supply system. The water jacket of the furnace body is connected to the atmosphere and is in a state of normal pressure.

2.1.106 Design heat consumption of maxi-mum hour

The hourly heat consumption of water equipment and appliances in the hot water supply system during the maximum water consumption period.

2.1.107 design heat supply of maximum hour

The hourly heat production of water heating equipment in the hot water supply system during the maximum water consumption period.

2.1.108 reversed return hot water sys-tem

A hot water supply system in which the sum of the lengths of the water supply and return pipes corresponding to each water distribution point is equal or approximately equal.

2.1.109 heat carrier circulation system of the first circulatory system

In the centralized hot water supply system, the heat medium or hot water circulation system formed between the hot water boiler or hot water unit and the water heater or hot water storage tank.

2.1.110 Second circulatory system hot water circulation system

In the centralized hot water supply system, a hot water circulation system composed of a water heater or a hot water storage tank and hot water supply and return pipes.

2.1.111 Uplink downfeed system

The water supply horizontal main pipe is located in the upper part of the water distribution pipe network, and the water is supplied downward through the standpipe.

2.1.112 Downlink upfeed system

The water supply horizontal main pipe is located at the lower part of the water distribution pipe network, and the water is supplied upwards through the standpipe.

2.1.113 return pipe

In the hot water circulation piping system, the pipe section that only passes the circulation flow.

2.1.114 pipe system for fine drinking water

After the raw water reaches the standard after deep purification treatment, it is supplied to the water supply system for people to drink directly through pipelines.

2.1.115 water quality treatment of scale inhibitor and corrosion-delay

Using electric, magnetic, chemical stabilizers and other physical and chemical...