Let’s review the basic knowledge of installation engineering

Basic knowledge

1. Water supply engineering

(1) Classification of outdoor water supply systems

1 .Water supply system using surface water as water source System

2. Water supply system with groundwater as the water source

(2) Outdoor water supply system form: direct flow water supply system, circulating water supply system, sequential water supply system

(3) Indoor water supply system classification: living, production, fire protection

(4) Indoor water supply system composition: introduction pipe, water meter, pipeline, water supply accessories, boosted water storage equipment, indoor fire protection equipment

(5) Indoor water supply system pressure composition: H＝ H1+H2+H3+H4

H1＝Introduction tube Elevation difference from the most unfavorable loop and the most unfavorable point

H2=along and local resistance

H3=water meter resistance

H4=water head (heating The circulation pump only overcomes the resistance along the way and the local resistance, and the lift is 35-40m)

(6) Indoor water supply method

1. Simple water supply method

2. Set up water tank water supply method

3. Set up water pump water supply method

4. Set up water supply methods for pools, water pumps and water tanks

5. Zoned water supply method

6. Pneumatic water supply method

7. Frequency conversion water supply method

(7) Indoor water supply system piping diagram: upper part, Middle points, bottom points

(8) Indoor water supply laying method: surface installation, installation (Note: Galvanized steel pipes buried in walls should be anti-corrosion)

2. Drainage project

(1) Sewage and classification: domestic, production, rainwater Snow water

(2) Drainage system: confluence and diversion

(3) Drainage system components: outdoor and indoor

3. Heating engineering

(1) Heating system classification

1. Different heating media are used: hot water, steam, heatWind

2. According to the circulation power: mechanical, natural

3. According to the water supply and return method: single pipe, double pipe

4. According to heating Scope: local, concentrated, regional

(2) Hot water heating The basic form of the system

1. Double pipes for upper supply and lower return

2. Double pipes for lower supply and upper return

3. Vertical single pipe: sequential type, Leap type, adjustable sequential type, reverse flow type

4. Single double pipe system System

5. Horizontal single-pipe system

6. Zone heating

7 Same process and different process

(3) Heating system Main equipment

1. Expansion water tank: (circulating pump suction port included) Constant pressure, exhaust, accommodating expansion water, signaling function

2. Gas tank

3. Expansion device: (for high-rise buildings) corrugated expansion device, sleeve expansion device, natural Expansion telescopic device

4. Ventilation and air conditioning

(1) Air conditioning classification

1. According to the setting of air treatment equipment:

Centralized system: direct supply from air conditioning units Each room

Semi-centralized system: water cooling unit-fresh air unit/fan coil unit

Full decentralized system: water-cooled unit-fan coil unit

2. According to the type of medium used to bear the indoor load:

Full air system, full water system , air-water system, refrigerant system

3. According to the source of air processed by centralized air conditioning: Closed type, DC type, hybrid type

4. According to the sub-sections:

Air conditioning air system, air conditioning water system, purification air conditioning system, refrigeration equipment system, water cooling unit, cooling tower

(2) Main equipment: air conditioning unit, fresh air unit, fan coil unit

(3) Ventilation system:

1. Air supply and exhaust system: civil air defense, basement, garage (steel plate, fiberglass reinforced plastic)

2. Smoke prevention and exhaust system (steel plate, fiberglass reinforced plastic) , structural air duct)

3. Dust removal system

5. Boiler classification and model representation

(1) Classification

1. According to use: industry, heating, power station, locomotive

2. According to the heat-carrying medium provided: steam, hot water

3. According to the structure: fire tube, water pipe, water-fire tube mixture

4. According to the fuel: coal, oil, Gas

5. According to the burning method: hand burning and mechanical