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In accordance with the requirements of Notice on printing and distributing "the development and revision plan on engineering construction association standards in 2013 (the first batch)" (JIANBIAOXIEZI [2013] No.057) issued by China Association for Engineering Construction Standardization, the preparing group has formulated this specification through the extensive investigation and study, careful summarization of practical experience and reference to relevant international and foreign standards and on the basis of widely soliciting for opinions.
This specification consists of seven clauses, mainly covering: general requirements, terms, sewage-elevating device, design, construction, acceptance, maintenance, etc.
This specification is under the jurisdiction of the Professional Committee of Construction Water Supply and Drainage of the China Association for Engineering Construction Standardization, and is interpreted by the China Institute of Building Standard Design & Research Co., Ltd. (Address: 2# Interwest International Center, 9 Shouti South Road, Haidian District, 100048, Beijing). During use, the opinions and information for modification and supplement, if any, may be passed on to the interpretation organization.
Contents
1 General provisions 1
2 Terms 2
3 Sewage-elevating device 3
3.1 General requirements 3
3.2 Assembly 3
3.3 Storage sewage-elevating device 4
3.4 Draw-off sewage-elevating device 4
4 Design 6
4.1 General requirements 6
4.2 Selection 6
4.3 Pipelines 9
4.4 Power supply and distribution and control 11
5 Construction and installation 12
5.1 General requirements 12
5.2 Device installation 13
5.3 Pipeline installation 13
5.4 Pressure test 14
5.5 Debugging 14
5.6 Safety 15
6 Acceptance 16
7 Maintenance 17
Explanation of wording in this specification 18
List of quoted standards 19
1 General provisions
1.0.1 This specification is formulated to make the sewage-elevating device achieve advanced technology, economic feasibility, safety and hygiene, reliable operation, energy saving, convenient maintenance and quality assurance in the design, construction and acceptance of the project.
1.0.2 This specification is applicable to the projects of using complete sets of sewage-elevating devices in constructed, extended and renovated residential buildings, basements of public buildings and underground structures, and is not applicable to the elevation and elimination of the firefighting drainage and rainwater.
1.0.3 For the design, construction and acceptance of sewage-elevating device project, this specification shall be implemented and the requirements of current relevant standards of the nation shall be met.
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2 Terms
2.0.1 sewage-elevating device
special equipment for sewage elevating integrated by sewage pump, water storage tank (cavity), pipeline, valve, liquid level gauge and electrical controller. According to the regulation and control mode of sewage storage, it may be divided into storage type and draw-off type, and according to the working conditions of sewage pump, it may be divided into dry type and wet type
2.0.2 storage sewage-elevating device
a sewage-elevating device with a certain storage and adjustment capacity of sewage and a sewage pump which has a certain number of start-stop times (within 15 times /h)
2.0.3 draw-off sewage-elevating device
a sewage-elevating device without sewage adjustment capacity or with a small adjustment capacity (sewage flow from several seconds to more than ten seconds), and a sewage pump which is not limited by the number of start-stop times or allowed to start and stop more times (40 times /h to 60 times /h)
2.0.4 dry sewage-elevating device
a sewage-elevating device with the sewage pump and motor installed outside the water storage tank (cavity) without contacting the sewage medium
2.0.5 wet sewage-elevating device
a sewage-elevating device with the sewage pump and motor installed in the sewage medium of water storage tank (cavity)
2.0.6 solid-liquid separation device
a special device which is arranged in the storage sewage-elevating device, separates the sundries in the sewage from the sewage, and temporarily stores the separated sundries
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3 Sewage-elevating device
3.1 General requirements
3.1.1 The sewage-elevating device shall have low running noise, small vibration, closed structure, compact dimension, simple operation, safe and reliable operation, convenient installation and easy maintenance.
3.1.2 The components of the sewage-elevating device shall comply with the requirements of the current relevant national standards, and the device shall have nameplate marks, product certificates or certification marks.
3.2 Assembly
3.2.1 The storage regulating sewage-elevating device shall be composed of the following assembly:
1 Water storage tank (cavity);
2 Solid-liquid separation device (optional);
3 Sewage pump;
4 Inlet and outlet pipes and accessories;
5 Vent pipe;
6 Liquid level monitoring instrument;
7 Controller (panel).
3.2.2 The draw-off sewage-elevating device shall be composed of the following assembly:
1 Water storage tank (cavity);
2 Inlet separator (optional);
3 Sewage pump;
4 Inlet and outlet pipe connectors;
5 Vent pipe;
6 Liquid level controller;
7 Controller (panel).
3.3 Storage sewage-elevating device
3.3.1 The storage sewage-elevating device shall comply with the relevant requirements of the current industry standard CJ/T 380 Technical conditions of sewage-elevating device.
3.3.2 The effective volume of the water storage tank (cavity) of the storage sewage-elevating device shall comply with the requirements of 4.2.3 of this specification.
3.3.3 If the storage sewage-elevating device is equipped with a manual diaphragm pump, a diaphragm pump interface shall be reserved at the top of the water storage tank (cavity).
3.3.4 The storage sewage-elevating device shall be equipped with a standby pump with the water supply capacity not less than the maximum water supply flow and head of one sewage pump in operation.
3.4 Draw-off sewage-elevating device
3.4.1 The sewage pumps should be impeller pumps with large flow channel or vortex form, automatically agitating submersible sewage pumps and cutting sewage pumps which are not easy to block.
3.4.2 The water storage tank (cavity) shall be firm, durable, impact-resistant, corrosion-resistant, airtight and leak-proof, and shall be made of glass fiber reinforced plastics or plastic materials. The tank (cavity) body shall be made into such a shape that it is easy to discharge dirt without being deposited. The effective volume of the water storage tank (cavity) shall comply with the requirements of 4.2.3 of this specification.
3.4.3 If the draw-off discharge sewage-elevating device is provided with an inlet filter and a rotating blade is attached at the bottom, it is advisable to adopt a common sewage elevating pump.
3.4.4 The top of water storage tank (cavity) shall be provided with a vent pipe interface.
3.4.5 The controller (panel) shall realize unattended full-automatic operation mode, and have the functions of starting and stopping the sewage pump manually on site and through remote control, and should have communication interface and network intelligent management capability.
3.4.6 The design of the controller (panel) shall comply with the current national standard GB 50055 Code for design of electric distribution of general-purpose utilization equipment.
3.4.7 The controller (panel) shall have the functions of local display and remote display. The display function shall include the operation or alarm status of sewage pump, power supply status, current and voltage of motor and other parameters.
3.4.8 The controller (panel) shall have anti-interference ability, and shall comply with the relevant requirements of the current national standard GB/T 3797 Electrical control assemblies.
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4 Design
4.1 General requirements
4.1.1 The engineering design of sewage-elevating device shall meet the requirements of safety and hygiene of drainage of buildings and structures, and convenient construction and easy maintenance.
4.1.2 The performance of sewage-elevating device shall meet the needs of users for drainage flow and head.
4.1.3 Buildings (structures) using sewage-elevating devices shall have passages or hoisting holes to ensure that the devices enter the installation position.
4.1.4 A sump should be set at the lower part near the sewage-elevating device. The effective volume of the sump shall be greater than or equal to 0.1m3, and the depth shall be greater than or equal to 0.3m.
When the submersible sewage pump is used to drain the accumulated water in the sump, a liquid level switch shall be set in the sump, and the start and stop of the pump shall be controlled by a controller (panel).
4.1.5 A manual diaphragm pump should be set outside the water storage tank (cavity). When the sewage pump breaks down and needs maintenance, the sewage in the water storage tank (cavity) shall be removed by manual operation. The outlet water from manual diaphragm pump shall be discharged into the outlet pipe of the device, and a gooseneck shall be set before connection.
4.1.6 Installation and maintenance space of not less than 600mm shall be reserved around and above the sewage-elevating device; when installing in the pit, the distance from sewage-elevating device to surrounding pit wall and pit cover plate should not be less than 200mm.
4.1.7 Ventilation facilities shall be set up in the places where the sewage-elevating device is set, and the ventilation frequency shall not be less than 3 ~ 5 times/h.
4.2 Selection
4.2.1 The storage sewage-elevating device is suitable for occasions where the drainage is uneven, storage regulation is required, and there is installation space on site; the draw-off sewage-elevating device is suitable for the occasions where the drainage is relatively uniform, the sewage is discharged timely, and the on-site installation space is relatively narrow.
The wet sewage-elevating device is suitable for the occasions where the temperature of transported sewage is low (less than or equal to 40℃), non-corrosive or the installation space is narrow; the dry sewage-elevating device is suitable for the occasions where the sewage of various properties can be transported, there is installation space on site and the inspection and maintenance is convenient.
4.2.2 The performance parameters of sewage pump shall be determined by the following methods:
1 The drainage flow qt of the sewage-elevating device shall be determined by the design peak flow of sanitary wastewater which is calculated in accordance with the relevant requirements of the current national standard GB 50015 Code for design of building water supply and drainage. When the sewage-elevating device is equipped with two or more sewage pumps to operate at the same time, the flow qb of each sewage pump shall be calculated using the following formula:
(4.2.2-1)
where,
qb——the flow of each sewage pump, m3/h;
qt——the drainage flow of the sewage-elevating device, m3/h;
n——the number of sewage pumps to be started simultaneously.
2 The head of sewage pump shall meet the requirements of the following formula, and be checked according to the vertical height from the highest point of outlet pipe to the lowest liquid level of sewage-elevating device as the static head:
Hb≥10(H1+H2+H3) (4.2.2-2)
where,
Hb——the head of the sewage pump, kPa;
H1——the height difference of sewage elevating, m, that is, the height difference between the outdoor outlet center of the sewage outlet pipe and the lowest water level of the water storage tank (cavity);
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H2——the sum of the on-way and local resistance losses of the suction pipe and outlet pipe of sewage pump, m. When there is no solid-liquid separation device and filter at the inlet end, the local resistance loss shall be 20% of the on-way resistance loss. When there is a solid-liquid separator and a filter at the inlet end, the local resistance loss shall be 20% of the on-way resistance loss by more than 0.5m ~ 1.0m;
H3——the additional outflow water head of sewage pump outlet pipe, m. When the total head is less than or equal to 20m, it should be 1m ~ 2m; when the total head is greater than 20m, it should be 2m ~ 3m.
3 When selecting sewage pump, check the Q-H characteristic curve of sewage pump, and the pump flow corresponding to Hb shall be greater than or equal to the calculated drainage flow qb.
4.2.3 The water storage tank (cavity) shall be selected according to the following requirements:
1 The volume of water storage tank (cavity) of storage sewage-elevating device shall be calculated using the following formula:
V=V1+V2+V3 (4.2.3)
where,
V——the total volume of the water storage tank (cavity), m3;
V1——the effective volume of the water storage tank (cavity), m3. The drainage flow of the device within 2.0min ~ 2.5min should be taken. This volume shall be greater than or equal to the volume of outlet pipe between outlet pipe check valve and gooseneck;
V2——the volume of sewage left in the water storage tank (cavity) when the sewage pump is stopped, m3; in case of wet installation, the level when the pump is stopped shall be half of the motor height of submersible sewage pump, and shall meet the suction requirements for sewage pump;
V3——the volume of the space above the maximum liquid level of pump starting in the water storage tank (cavity), m3; the height of space above the maximum liquid level may be 0.1m~0.15m
2 The effective volume of the water storage tank (cavity) of the draw-off sewage-elevating device should be the product of the sewage pump flow and its minimum operating time.
1 General provisions
2 Terms
3 Sewage-elevating device
3.1 General requirements
3.2 Assembly
3.3 Storage sewage-elevating device
3.4 Draw-off sewage-elevating device
4 Design
4.1 General requirements
4.2 Selection
4.3 Pipelines
4.4 Power supply and distribution and control
5 Construction and installation
5.1 General requirements
5.2 Device installation
5.3 Pipeline installation
5.4 Pressure test
5.5 Debugging
5.6 Safety
6 Acceptance
7 Maintenance
Explanation of wording in this specification
List of quoted standards
