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GB 50273-2022: Standard for construction and acceptance of boiler installation engineering
GB 50273-2022
UDC GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
P GB 50273-2022
Standard for construction and acceptance of boiler
installation engineering
ISSUED ON: JANUARY 05, 2022
IMPLEMENTED ON: MAY 01, 2022
Issued by: Ministry of Housing and Urban-Rural Development of the People’s
Republic of China;
State Administration for Market Regulation.
Table of Contents
1 General provisions ... 7
2 Foundation recheck and surveying ... 8
3 Steel racks ... 9
4 Drum, header and tubes on heated side ... 12
4.1 Drum and header ... 12
4.2 Tubes on heated side ... 15
4.3 Welding of pressure components ... 19
4.4 Economizer, superheater and air preheating piping ... 22
5 Pressure test ... 25
6 Tap, instrumentation, valves, soot blower and auxiliaries ... 29
6.1 Tap... 29
6.2 Instrumentation ... 31
6.3 Valves, soot blower and auxiliaries ... 34
7 Burning equipment ... 38
7.1 Stroker ... 38
7.2 Spreader ... 41
7.3 Burner ... 42
8 Furnace wall building and insulation ... 45
8.1 Furnace wall building ... 45
8.2 Insulation ... 46
9 Air leakage test, furnace drying, boiling out, tightness test and test run ... 47
9.1 Air leakage test ... 47
9.2 Furnace drying ... 48
9.3 Boiling out ... 50
9.4 Tightness test and test run ... 51
10 Acceptance ... 53
Explanation of wording in this standard ... 56
List of quoted standards ... 57
Addition: Explanation of provisions ... Error! Bookmark not defined.
1 General provisions
1.0.1 This Standard is formulated to improve the construction level of boiler installation
engineering, promote technological progress, ensure project quality and safety, and
improve economic benefits.
1.0.2 This Standard applies to the construction and acceptance of fixed steam boilers
with a rated working pressure less than or equal to 3.82 MPa for industrial, civil and
district heating, fixed hot water boilers with a rated water outlet pressure greater than
0.1 MPa, and organic heat carrier furnace installation engineering. It is not applicable
to the construction and acceptance of cast iron boilers, boilers for transportation vehicle
and ship, nuclear power boilers, and power station boilers installation engineering.
1.0.3 Boilers whose engineering acceptance procedures have not been completed
are strictly prohibited from putting into use.
1.0.4 Before and during the installation of boilers, if any quality problems are
found in the pressure-bearing parts that affect safe use, the installation must be
stopped and it must be reported to the construction unit.
1.0.5 In addition to complying with this Standard, the construction and acceptance of
boiler installation engineering shall also comply with the provisions of relevant national
standards in force.
Where: Hn – tube expansion rate of inner diameter control method;
Hw – tube expansion rate of outer diameter control method;
d1 – actual inner diameter of the tube after expansion (mm);
d2 – measured inner diameter of the tube when not expanded (mm);
d3 – actual diameter of the tube hole when not expanded (mm);
d4 – measured outer diameter of the tube close to the outer wall of the drum
after expansion (mm);
δ – difference between the tube hole and the actual outer diameter of the tube
when not expanded (mm).
2) The control of the expansion rate of boilers with a rated working pressure
greater than 2.5 MPa shall comply with the provisions of the accompanying
technical documents.
5 The expansion end and starting point should be expanded repeatedly with a distance
of 10 mm ~ 20 mm.
6 The tube mouth shall be beveled; the starting point of the bevel shall be flush with the
surface of the boiler drum (tube sheet). There shall be no obvious cuts or extrusion, and
the bevel angle should be 12° ~ 15°.
7 After expansion, the tube ends shall not have defects such as peeling, wrinkles, cracks,
cuts and extrusion.
8 The number of expander rollers should not be less than 4; the effective length of the
expander cylindrical straight section shall be the drum wall thickness plus 15 mm. The
expansion tube shall be measured using special tools. The surface of the expansion rod
and roller shall be free of defects such as bumps, pits, and scratches. The speed of
electric and pneumatic tube expanders shall not be greater than 60 r/min.
4.2.8 After the expansion work is completed, a water pressure test shall be carried out,
and the tightness of the expansion joints shall be checked and the expansion joints that
need to be expanded shall be determined. The expansion shall be carried out
immediately after the water is released, and the number of expansions should not exceed
2 times.
4.2.9 Before expansion filling, the inner diameter of the expansion mouth shall be
remeasured and the expansion filling value shall be determined. The expansion filling
value shall be calculated based on the change in the measured inner diameter of the
expansion mouth before and after the expansion filling. After the expansion filling, the
cumulative expansion rate of the expansion mouth shall be the sum of the expansion
rate before the expansion and the expansion filling rate. The cumulative expansion rate
3 The quality of the radiographic testing of the welds of the butt joints of the tubes on
heated side of the organic heat carrier furnace shall not be lower than Grade II, and the
quality of the ultrasonic testing shall not be lower than Grade I.
4.3.12 When adopting radiographic testing or ultrasonic testing, the number of non-
destructive tests shall comply with the following provisions:
1 When the rated working pressure of the steam boiler is equal to 3.82 MPa and the
nominal outer diameter is less than or equal to 159 mm, the number of non-destructive
tests shall not be less than 25% of the number of welded joints; when the rated working
pressure of the steam boiler is greater than 0.8 MPa and less than 3.82 MPa, and the
nominal outer diameter is less than or equal to 159 mm, the number of radiographic
tests shall not be less than 10% of the number of welded joints. When the rated working
pressure of the steam boiler is greater than 0.8 MPa, the nominal outer diameter is
greater than 159 mm or the nominal wall thickness is greater than or equal to 20 mm,
the welded joints shall be subjected to 100% non-destructive testing. When the rated
working pressure of the steam boiler is less than or equal to 0.8 MPa, non-destructive
testing is not required.
2 When the rated outlet water temperature of the hot water boiler is greater than or equal
to 120 ℃ and the nominal outer diameter is less than or equal to 159 mm, the number
of radiographic testing shall not be less than 10% of the total number of circumferential
seams; when the nominal outer diameter is greater than 159 mm or the wall thickness
is greater than or equal to 20 mm, each weld shall be 100% non-destructively inspected;
when the rated outlet water temperature of the hot water boiler is less than 120 ℃, non-
destructive testing is not required.
3 For the butt joints of the pressurized organic heat carrier furnace with an outer
diameter greater than or equal to 159 mm, 20% of the number of joints shall be
subjected to radiographic testing; for the butt joints of the tubes with an outer diameter
less than 159 mm, 10% of the number of joints shall be subjected to radiographic testing;
for the condensate tank, expansion tank and storage tank, 20% of each weld shall be
subjected to r...