1 scope
The standard is suitable for civil and
industrial buildings hot water temperature does not exceed 150 ° c heating
piping installation works.
2 construction preparation
2.1 materials requirements:
2.1.1 tubes: carbon steel pipe, seamless
steel pipe. Pipes shall not be bent and rusted, no fin, double skin and rugged.
2.1.2 tubing: no offset clasp, square
buckle, buckle, breaking point and inaccuracies.
2.1.3 valves: casting rules, without burrs,
cracks, flexible tight thread damage-free, straight and correct, strength meets
the requirements, handle without damage. Factory certification, installation
should be in accordance with the relevant provisions of the strength and
tightness test.
2.1.4 other materials: steel, round steel,
Guan Kazi, bolts, nuts, oils, linen, cushions, electric welding rod. Selection
should comply with the design requirements.
2.2 the main tools:
2.2.1 equipment: wheel saws, pipe threader,
bench drill, electric welding machines, such as simmering bending.
2.2.2 tools: pressure, bench vise, welding
tools, pipe wrench, hammer, hand saw, wrench, etc.
2.2.3 other: steel tape measure, level,
wire pendant, chalk, small lines.
2.3 operating conditions
2.3.1 dry tube installed: located inside
the gutter pipes, gutter debris should be cleaned up elevator has been
installed, without gaigou the cover before installation. Located under the
floor and the top of the pipe should be Cap structure or structures installed
after the installation of more than one layer.
2.3.2 pipe installation must be carried out
after determining accurate ground elevation.
2.3.3 pipe installation must be carried out
after plastering the walls.
3 operational processes
3.1 process:
Installation preparation – operations → card
installation standpipe installation → → → dry tube installed
pipe installation →
Test → washing →
anti-corrosion → heat → debug
3.2 installation preparation:
3.2.1 earnestly familiarity with drawing
paper, with the construction progress, reserve tank and installation of
embedded parts of the cave.
3.2.2 design drawings to draw the lines of
position, pipe diameter and variable diameter, provision, direction, location
sketches such as card, including pipe start point, and at the end turn, nodes.
Provision, coordinates, and so on.
3.3 pipe installation:
3.3.1 according to the construction plan,
prefabricated pipe machining, including: broken pipe, threading, parts,
straightening, check size, grouped by loop number neatly.
3.3.2 Installing the card, spacing in
accordance with design requirements or installation. Elevator installation, the
sticks according to the slope, hanging steel on a stick order, rings on a
spacing position in pipe and bolt screw nut on the lift tube to wear, fixed the
tubes. Pipe on the mounting bracket, put the tube in place on the Bay, u-shaped
section pipes packed card, then install the second tube, pipe sections after
this, good fastening bolts.
3.3.3 pipe installation should begin at
entrance or branch point, tubing before you check the lumen and clean. In silk
head at coated good lead oil wrapped around good Ma, a people in end helped
flat pipeline, a people in interface at put tube relative fixed alignment silk
buckle, slowly turned into buckle, with a put tube clamp bite Qian section
fittings, with another a put tube clamp turned tube to elastic moderate,
alignment adjustable straight Shi of mark, requirements silk buckle exposed 2~3
buckle, and clear off Ma head according to this method loaded finished weizhi
(pipeline through expansion joints or had ditch at, must first dressed steel
casing).
3.3.4 when making a horn bent, two of
around 75 ° elbow should be simmering, sawed a Groove at the joins, sawed the
head duck lips, a good fight after spot, after leveling, alignment, looking for
straight, then weld. Horn bent the calibre of the junction must equal the run
size, and the bending radius should be about 2.5 times the diameter. Tube wall
mounted tap as shown in Figure 1-11.
3.3.5 tap valve tap points should not be
too far away. If the tap is the lowest point of the system, you must prefix in
the tap valve with drain plug. Gas tank inlet and outlet should be open about
tank in lower high 1/3. Get connected with a pipeline installed after
straightening. Let in fresh air pipe should be stable, such as unstable can be
installed two clips, set when the gas tank is located in the system, should be
loaded up, elevator.
3.3.6 used welding pipe, first put pipe
selected good adjustable straight, cleanup good tube bore, will tube shipped to
installation locations, installation program from first section began; put tube
in place find are, alignment tube mouth makes reserved mouth direction
accurate, find straight Hou with gas welding spot fixed (tube diameter ≤ 50mm
following welding 2 points, tube diameter ≥ 70mm above spot 3
points), then Shi welding, welding finished Hou should guarantee pipeline
integrity.
3.3.7 have expansion joints should be in
the prefabrication according to the specification to pretension and make
records. Fixed by location, connected with a pipe. Bellows expansion joints
should be installed according to the requirements-driven scaffolds and
fixation. And installation of valves, gas cans and other ancillary equipment.
3.3.8 the piping is installed, check the
coordinates, elevation, reserved outlet position and pipeline diameter is
correct, and then look for straight, level proof check slopes, after passing
the adjustment, then adjust the elevator bolts u-card, making it tight
moderately, laying, welding firm card of the last stop plate.
3.3.9 straighten or installing pipes
structure at the bushing, ring gaskets pipe entrance, reserved outlet pipe
should be temporary blocked.
3.4 vertical installation:
3.4.1 reserved hole locations on each floor
if vertical, hanging, pick eyes, kind of clamp. Prefabricated piping in numerical
order delivered to the installation site.
3.4.2 installation before removing the
valve cover and put steel casing to the tube, according to numbers from the
first section to begin the installation. Applying lead round Mahjong riser at
the interface of oil turned into ring, a bit pipe pipe clamp, screwed pipe pipe
clamp, screwed to the elasticity moderate, when aimed at straightening the
marking requirements, threads exposed 2~3 buckle provision until the fair and
pure hemp.
Each provision 3.4.3 check riser height,
direction, half bent, are accurate and fair. Previously planted pipe clamp
release, put the tube into the tightening bolts, hangers, and looking for a
vertical line starting from the first tube, strengthening of the steel casing,
and finally the ring gaskets holes, provision must be a good temporary plug.
3.5 branch pipe installation:
3.5.1 Check radiator installation location
and riser provision was accurate. Fork bending tube and lamp sizes. (Radiator
Centre away from the wall and the standpipe reserve Center differential from
the wall).
3.5.2 distribution pipes, according to the
volume of the branch pipe size, minus the amount of light fork bent and broken
pipes, wires, and simmering light fork-bending and straightening. Lead oil fork
bending both ends around the lamp, oil-packed, connected radiators, clean
linen.
3.5.3 a concealed or half-concealed
radiators (as described in the sixth chapter) light fork bending must be
commensurate with the furnace slot corner, good appearance.
3.5.4 the use of tools, horizontal ruler,
line proof pipe from the wall parallel to the slope and dimensions, and review
the risers and radiators without moving. According to the design or system
pressure testing and washing under pressure, after passing the acceptance formalities,
net and water discharge.
3.5.5 stand tube diameter, should not use
cast iron bushing, welding or reducer coupling should be used.
3.6 heating:
3.6.1 first contact a good heat source,
pass the warm range according to the heating area, development of Tong warming
personnel Division, check whether the heating system drain valve closed, dry,
State, control of the valve is turned on.
3.6.2 to system filled with softened water,
began to turn on the highest point of the system to test the waters first
valve, arrange for someone to look after. Slowly open the system of backwater
dry pipe valve, see you in the highest point of the blow down valve closes
after water out valve. Then open the water supply valves total, high blow down
valve to repeatedly open a few times, so that cold air drain on the system so
far.
3.6.3 running half an hour later, started
checking all systems, in the event of no heat should first identify the cause,
flush when you want, close the valve outlet supply and return water, and successively
switching valve water supply and return water rinse, rinse again in accordance
with the above mentioned programs run warm, until normal.
3.6.4 pass warm in winter, temporary
heating measures must be taken, can only be + 5 ° c above room temperature. In
case of uneven heat, adjust the tap pipe, tube, valve, making it after
achieving a balance, an official inspection and acceptance, and the acceptance
formalities.
4 quality criteria
4.1 project:
4.1.1 test results for plumbing and heating
the water pressure of the system as a whole, must conform to the design and
construction specifications.
Inspection method: check the system or
partition (above) records.
4.1.2 pipe fixation position and must
comply with the design requirements and construction specifications.
Inspection method: observation and checked
against the design drawings.
4.1.3 installation location must comply
with the design requirements for the expansion, and should be in accordance
with the relevant provisions of the pretension.
Inspection method: checked against the
design drawings and records check the pretension.
4.1.4 the lip of the pipe welds and bent
parts non-welded pipe, interface welds from the bending points, branch, the
hanger side must be greater than 50mm.
Inspection method: observation and standard
checks.
4.1.5 strainer filter materials,
specifications and dressing method must conform to the design and construction
specifications.
Inspection method: check the dissolution.
4.1.6 completion of heating supply system,
you must check the washing quality.
Inspection method: check the purge records.
4.2 Basic project
4.2.1 the slope of the pipe shall conform
to the design requirements.
Inspection method: level (level), cable and
standard checks or check the measurements recorded.
4.2.2 carbon steel pipe thread connection
thread should be clean, neat, no broken or missing wire firmly attached, pipe
thread roots exposed 2~3 buckles, interface is not exposed in Yau Ma Tei and
other defects.
Inspection method: observation or check the
dissolution.
4.2.3 welding welding of carbon steel pipe
straightness, reinforcement of weld surfaces in accordance with design
specifications, burn, crack-free weld surface and apparent nodule, inclusions
and holes and other defects, soldering wave uniform.
Inspection method: observation or using a
welding inspection-scale inspection.
4.2.4 valve installation type,
specification compressive strength and tightness test results in accordance
with the design and construction specifications. Installation location, import
and export right directions, securely close, opening and close flexibly, ease
of use, clean the surface.
Inspection method: hand checking and
inspection of factory certification.
4.2.5 pipe support (hanging up) and socket
(Tun) installation shall conform to the following requirements: constructed
correctly, laying laying strong, neat, frame and pipe in close contact.
Inspection method: observation and hand
checks.
4.2.6 installed in the walls and floor of
the casing should satisfy the following requirements: the top of the casing in
the floor above the ground not less than 20mm. Bottom flush with the ceiling
surface, both ends of the wall sleeve and flat finishes. Fixation, flush
nozzle, girth evenly.
Inspection method: observation and standard
checks.
4.2.7 pipes, boxes and metal stent coating
shall meet the following requirements: paint type and brushing a few times to
meet design requirements, good, no peeling, blistering and missing coating,
coating thickness uniformity, consistent color, flow and pollution-free.
Inspection method: Visual check.
4.3 allowable deviation:
Indoor heating pipe installation tolerances
and inspection methods are given in table 1-12.
Indoor heating pipe installation tolerances
and inspection methods (mm) table 1-12
Allowed deviation of the project method
Horizontal in horizontal pipe 1M pipe
diameters less than or equal to 100
Pipe diameter larger than 100 0.5
1
Horizontal ruler, Straightedge
1 direction bending (mm) total length
(25m) diameter less than or equal to 100
Pipe diameter greater than 100 less than 13
Not more than 25 cable and check
The ellipticity
Dmax-Dmin diameter is less than or equal to
100
2 pipe diameter Dmax greater than 100 8/100
with a caliper and ruler
Tube diameter is less than or equal to 100
Pipe diameter larger than 100 4
5
5 finished product protection
5.1 installed pipe shall not be used as
hanging load and supporting, nor does the pedal stepped on.
5.2 when transporting material, machine and
welding, with specific protective measures shall not have walls and floors get
dirty, damaged.
5.3 pipe after installation, valve
handwheel should be removed, keep, upon the completion of a unified install.
6 quality problems to be noticed
6.1 pipe slope is not uniform. Is caused by
installing pipes and open interface does not straighten or elevator tension is
inconsistent, riser clamp is not tightened, fork bending the light rough, and
tap pipeline prefabrication, did not join the investigation.
6.2 pipe is not perpendicular, largely due
to the size allowed, push, Lali pipe caused. Tiered risers and not from the
wall is inconsistent, mainly picking holes, do not wait and garrison.
6.3 lamp fork bent and inconsistent, mainly
due to a simmering bending of different size, angle, long and short causes.
6.4 casing at the bottom on both sides of
the wall or precast exposed, because the casing caused by too long no soldering
iron or steel casing.
6.5 Ma head cleaning dirty, caused because
the operator is not clear in time.
6.6 pressure and General warming, pipe is
blocked. Primarily installation, provision did not install temporary plugging
into the debris caused.
Quality of 7 records
7.1 there should be material equipment
factory certificate.
7.2 entering inspection records of
materials and equipment.
7.3 radiator pressure test set of records.
7.4 heating pipe of inspection records.
7.5 heating pipe inspection records.
7.6 heating pipeline compensator
pre-stretching records.
7.7 supporting pipes, radiators for heating
inspection records.
7.8 single pressure test of heating pipe
records.
7.9 hidden heating pipeline inspection
records.
7.10 floor heating system pressure test
records.
7.11 wash the heating system records.
7.12 try adjusting the heating system
records.
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