【 Weak current College 】 pipeline construction drawings to read and do the installation budget basics (1)

The first chapter of the pipeline construction chart reading

1. the design specification, warm air pipes must not be less than the DN20.

2. insulation general practices – water: anti-Dewing insulation, thermal insulation, fire protection with hot water:: without insulation, frozen water: even the valves are required insulation, cooling water: according to the design requirements, did not request can not be. General ceiling of pipe insulation is required.

Water supply: concealed condensation heat preservation; downlead across the hallway, bedroom and living room looking the Department must make dew insulation. Drainage: concealed condensation heat preservation do; downlead public toilet toilet seat on reverse bending must do.

Well, in addition to the fire, spraying pipeline pipelines are doing insulation.

3. galvanized pipe connections: the DN100 silk, > DN100 weldable (preservative), flange welding (secondary zinc plating), a small amount can be threaded flange connection.

4. the distance from the wall pipe jacketing is 25-50mm.

5. heating dry pipe risers, when the standpipe straight pipe < 15m, 2 x 90. Elbow pipe when linear > 15m with three 90. Elbow.

6. construction, pipe leak-Gao do not low, high low not Ning.

7. elevation: indoor plumbing generally tube, outdoor pipe drainage for water supply tube to tube end.

8. radiator should form a coaxial.

9. valve: switch function, resistance coefficient 0.5; globe valve: dip switch functions, drag coefficient of 19.

10. compensation is divided into: natural compensation, square type expansion force, elbow, bellows, telescopic compensators, spherical bulge, horny expansion force.

11. the gas tank: dry pipe ends, its the end of the pipe diameter of the caliber is 4-6 times. Expansion tank: voltage, exhaust, to accommodate the expanding role of water, signal. Pressure tank: voltage, exhaust.

Expansion tank total five pipeline: expansion pipe, circular tube, the overflow of water pipes, sewage pipes, signal pipe.

Gas tank installation location: pipeline interface from the gas tank top 2/3 from the bottom 1/3.

12. in accordance with the standard Atlas, mastering the htm entry.

13.PP-R tube can form aluminum-plastic composite pipe or water supply pipe fixed U-PVC.

14. (1) rigid waterproof casing: I type waterproof jackets, waterproof casing type II, type ⅲ waterproof casing

I type waterproof casing suitable for cast iron pipe and non-metallic tube; II type waterproof casing suitable for steel pipe; ⅲ waterproof casing suitable for pipe-to-wing ring directly included in the tube.

(2) General flexible waterproof casing suitable for pipe through the walls of the Office by a vibration or have strict requirements of the structure is waterproof.

General pipeline wear waterproof exterior wall of the pipe and casing. Put the pipe used pool flexible waterproof casing.

If outdoor water level high with flexible waterproof casing, outdoor water use rigid waterproof casing.

15. General water meter tube diameter pipe diameter smaller size.

16. the water-supply pipes on those who received two or more water points, branch pipes are live connector and flanges. If the branch pipe except received water meter.

17. requirements: washbasin (wash dishes) and the top edge of the margin 800mm.

Water nozzle spacing between the top edge of the basin of 200mm.

MOP water nozzle and the top edge of the pool from the MOP 300mm

Toilet seat water margin to 250mm

Basin water margin to 450mm

18. the risers to the surface must be combined with the valve and fittings.

19. the fire hydrant: single bolt specification: DN65, for fire protection design to should not be installed in the door shaft side

Double bolt DN50 hydrant box DN65 or thickness of 240mm, for fire protection Design Center to

Single bolt + self-help reel 1.1m

20. water meter installation: residential: valve + meter

Public building: valve + water + valve

Outdoor: valve + water + valve + damping valves +, etc.

21. the sweeping mouth: coming to two and more than two pieces, health apparatus should be sweeping mouth on, if a leak can not.

Standpipe inspection openings: the lowest and highest level must be set, every one to two layer settings.

Dry pipe length across several rooms every 8-12m sweeping mouth or when you should check the mouth.

22. the vertical pipe diameter size header must be used, pipes can be used to fill the heart, if the meter RADIUS.

Size head bushing

23. drainage pipe elbow tee's selection:

Cross tube and riser tilted 90 degrees should be used in three or four way

Cross tube and cross tube should be 45 ° tee or stone

Risers and drainage pipes (such as a household management) application 2 45 degree elbow or RADIUS greater than 4 times the d 90 ° elbow

24. the water bends: P-type — squatting is s-type — the washbasin, urinal

Chapter II basics

First, the water supply project

(A) the classification of outdoor water supply system

1. surface water as water-supply system

2. groundwater for water-supply system

(2) forms of outdoor water supply system: DC-supply systems, circulating water system, water supply system in an orderly

(Iii) classification of indoor water supply system: life, production, fire fighting

(4) indoor water supply system: introduction of pipes, water meter, pipe, water supply and water storage device attachment, step-up, indoor firefighting equipment

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

H1 = service pipe and the most negative loop, the most negative point of elevation difference

H2 = along and local resistance

H3 = water meter resistance

H4 = water head (heating circulation pump only overcome along and local resistance, head 35-40m)

(6) indoor water supply mode

1. simple water way

2. set the tank water way

3. set the pump water way

4. setting the water tank, water pumps, water tank and water ways

5. partition water-supply mode

6. pressure water way

7. frequency conversion water supply mode

(VII) indoor water system piping schematic: on, in, the following points

(8) indoor water supply system of laying: Ming Pack, install (Note: buried walls of galvanized steel anticorrosive should do)