GB 50275-2010 PDF English
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GB 50275-2010: PDF in English GB 50275-2010
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
UDC
P GB 50275-2010
Code for Construction and Acceptance of Fan, Compressor and
Pump Installation
ISSUED ON: JULY 15, 2010
IMPLEMENTED ON: FEBRUARY 1, 2011
Issued by: Ministry of Housing and Urban-Rural Construction of the People’s Republic
of China;
General Administration of Quality Supervision, Inspection and Quarantine
of the People’s Republic of China.
Table of Contents
Foreword ... 4
1 General Provisions ... 7
2 Fan... 8
2.1 Basic Requirements ... 8
2.2 Centrifugal Fan ... 11
2.3 Axial Fan ... 13
2.4 Roots and Jaeger Blower ... 16
2.5 Centrifugal Blower ... 16
2.6 Axial Blower ... 23
2.7 Anti-explosion Fan and Firefighting Smoke Extractor Fan ... 27
3 Compressor ... 29
3.1 Basic Requirements ... 29
3.2 Factory Assembled Compressor ... 30
3.3 Site Assembled Reciprocating Compressor ... 30
3.4 Attached Equipment ... 35
3.5 Test run ... 36
3.6 Non-lubricated Compressor ... 38
3.7 Screw Type Compressors ... 39
3.8 Centrifugal Compressor and Axial Flow Compressor ... 40
4 Pump ... 42
4.1 Basic Requirements ... 42
4.2 Centrifugal Pump ... 45
4.3 Well Pump ... 49
4.4 Mixed-flow Pump, Axial Pump and Vortex Pump ... 55
4.5 Reciprocating Pump ... 58
4.6 Membrane Pump and Metering Pump ... 61
4.7 Screw Pump, Gear Pump and Rotor Pump ... 63
4.8 Water-ring Vacuum Pump ... 65
5 Engineering Acceptance... 67
Appendix A Vibration Testing and Limits of Fan, Compressor and Pump ... 68
Appendix B Cleanness Testing and Limits of Compressor and Pump ... 71
Appendix C Requirements on Configuration of Pump Suction and Discharge Line ... 74
Explanation of Wording in This Code ... 78
List of Quoted Standards ... 79
1 General Provisions
1.0.1 This standard is formulated with a view to guaranteeing quality and safe operation of fan,
compressor and pump installation engineering, and promoting technological advances of fan,
compressor and pump installation.
1.0.2 This standard is applicable to the construction and acceptance for installation engineering of
the following fans, compressors and pumps:
1 Centrifugal fan, centrifugal blower, axial fan, axial blower, Roots and Jaeger blower, anti-
explosion fan and firefighting smoke extractor fan;
2 Displacement reciprocating type, screw type, sliding blade type and membrane type
compressor, axial flow compressor and centrifugal compressor;
3 Centrifugal pump, well pump, membrane pump, metering pump, mixed-flow pump, axial
pump, vortex pump, screw pump, gear pump, rotor pump, submersible water pump, turbine pump,
water ring pump, and reciprocating pump.
1.0.3 The construction and acceptance of fan, compressor and pump installation engineering shall
not only comply with this standard, but also the requirements specified in the relevant current
standards of the country.
oxygen, the parts, component, pipes as well as the accessories shall be de-oiled, and the oil residue
level after de-oiling shall not be larger than 125mg/m2; they shall be blown dry with dry air or
nitrogen after de-oiling, and treated with oil-free sealing;
3 Oil pump, filter, oil cooler, safety valve, etc., equipped in lubricating system and sealing
system shall be dismantled and cleaned;
4 The tightness test shall be conducted for oil cooler at maximum working pressure, and the oil
cooler shall have no leakage, 10min after pressure maintaining;
5 In the site assembly, mating surfaces and machining surface of the machine, surface of
rotatable parts, as well as attached equipment of the components, shall be washed and cleaned; the
rust, if have, shall be removed, and the rust-proofing measures shall be taken to prevent rusting during
installation period;
6 The regulating mechanism shall be washed and cleaned, and it shall rotate smoothly.
2.1.4 Centering for shafts (axes) of fan units shall meet the following requirements:
1 The machine located in shafting or with large mass or great installation difficulty shall be
selected as reference machine for centering.
2 Non-reference machine shall be centered and leveled on the base of reference machine, and
the shafting of the unit in work shall be made continuous smooth curve equivalent to the lift on both
ends;
3 The final centering of the unit shafting shall be conducted by practical rotor passing through
the coupling, and it shall meet the requirements of items 1 and 2 in this article.
2.1.5 The end clearance, radial displacement and axial slope of the coupling shall meet the provisions
of the accompanying technical documents; if no provisions related are available, the relevant
provisions stated in the current national standard “General Code for Construction and Acceptance of
Mechanical Equipment Installation Engineering” GB 50231 shall apply.
2.1.6 Besides the relevant requirements in the current national standards “Code for Construction and
Acceptance of Industrial Metallic Piping” GB 50235 and “Code of Acceptance for Construction
Quality of Ventilation and Air Conditioning Works” GB 50243, the air inlet, gas exhaust piping and
other pipelines of fans shall meet the following requirements:
1 The pipeline, large valve, regulating device, cooling device and lubricating oil system, etc. of
fan air inlet and gas exhaust systems, shall be provided with independent support. Such supports shall
be connected firmly with the base or other buildings; for connecting with the fan casting, the external
force shall not be applied on the fan casting. After the connection, the installation level and main
clearance of the units shall be re-measured, and they shall meet the requirements of the accompanying
technical documents;
2 There shall be no permanent support, affecting thermal expansion and contraction, on the
straight pipe segment connected with fan air inlet and outlet (exhaust) flange;
3 For connecting the pipeline and the fan, the flange face shall be centered and parallel;
4 The installation of the compensators in the gas circuit system shall meet the requirements of
the accompanying technical documents.
2.1.7 Between the flange jointing surfaces on the fan casting shall be applied with a layer of sealing
gum; the bolt threaded portion shall be coated with binding gum, and the bolt shall be tightened up
according to the specified moment or the nut rotation angle.
2.1.8 If the fan driver is a rotor-through motor, the clearance between the shaft shoulder and the
bearing bush of the sliding bearing hereof, as well as the axial displacement and clearance of the
coupling, shall be determined according to the magnetic center location of the motor.
2.1.9 The lubricating, sealing and hydraulic control systems of fans shall be washed and cleaned; the
compression parts of the lubrication, sealing, hydraulic control, cooling and gas circuit systems of the
funs after assembling shall be applied with tightness test at the maximum working pressure, and they
shall have no leakage, 10min after pressure maintaining; the test pressure for a fan cooling system
shall not be less than 0.4MPa.
2.1.10 The installation of the cable and pipelines for testing and control instruments of the fan shall
not disturb dismantling bearings, sealing and fan internals.
2.1.11 The fan vibration isolator shall be located on correct position, and the compression amount of
all vibration isolators (groups) shall be uniform. The deviation hereof shall meet the requirements of
the accompanying technical documents.
2.1.12 The fans before test run shall meet the following requirements:
1 The bearing box and oil tank shall be filled with lubricating oil upon being washed, cleaned
and inspected; the specification and amount of the filled lubricating oil shall meet the requirements of
the accompanying technical documents;
2 The rotation direction or the drivers like motor, steam turbine and tail gas turbine shall meet
the requirements of the accompanying technical documents;
3 The rolling fan shall be free from friction or impacting;
4 The lubricating system and the hydraulic control system shall run normally;
5 The cooling water system shall have normal water supply;
6 The safety/interlock alarm and the stop control system of fans shall be applied with
simulation test, and they shall meet the following requirements:
1) The pressure of the cooling system shall not be less than the specified minimum value;
2) The oil level and pressure of the lubricating oil shall not be less than the specified
minimum value;
3) The temperature and temperature rise of the bearings shall be higher than the specified
maximum value;
4) The effective value or the peak to peak of the bearing vibration velocity shall not exceed
the specified value;
5) The surging alarm and gas release apparatuses shall be sensitive, correct and reliable;
and the deviation hereof shall not be larger than 1/1000;
2 The fan installing surface shall be flat, and contact well with the base or the platform;
3 The motor shaft center and the casing center of a direct-coupling fan shall keep uniform; the
adjustable gaskets under the motor support shall not exceed two layers.
2.3.3 The assembling and installation of site assembled axial fan shall meet the following requirements:
1 The installation level of the fan shall be tested longitudinally and transversally on the fan
base, or on the base and bearing seat on the fane support, and the deviation hereof shall not be larger
than 1/1000;
2 The coaxiality of the rotor axis and the casing axis shall not be larger than ø2mm;
3 The fan shall be assembled according to the order and the exit-factory marks specified in the
accompanying technical documents;
4 The permissible deviation between the installing angel and the nominal value of guide blade
and rotor blade is ±2°; the radial clearance between the impeller and the casing shall be uniform; the
radial clearance between the impeller and the casing shall be 1.5‰~3.5‰ the impeller diameter; the
manual and automatic regulation range of the impeller shall meet the requirements of the accompanying
technical documents; the radial clearance between the casing and the maneuverable blade under
closed position shall meet the requirements of the accompanying technical documents; if there is no
requirement relevant, the radial clearance should be 1‰~2‰ the rotor diameter; in a static state, the
regulating function, regulating angular region and safety limit of adjustable blade and regulating
device shall be inspected. The permissible deviation between the blade angle indicating scale and the
actual angle is ±1°;
5 The casing connection shall be aligned and jointed tight, and the joint surface shall be coated
with a layer of sealing gum, the blade fixed bolt and casing flange bolt shall be fastened up and locked
according to the moment specified in the accompanying technical documents;
6 The connection between inlet chamber/diffusor and the casing, and between the inlet
chamber/diffuser and the fan drum fore and after shall be aligned and jointed flat. The connection of
all parts shall not cause deformation to the casing (main fan drum), or affect the change of the blade
tip clearance.
2.3.4 The centering (alignment) of the axial fan unit with tween drive spindle shall meet the
following requirements:
1 If the driver is a rotor-through motor, the magnetic center location shall be determined, and
the distance between two shafts shall be determined upon the thermal expansion of the middle shaft
and the axial clearance of the coupling shall be worked out and reserved;
2 The shafting of the unit shall be rotated in the coaxiality test, the clearance difference on the
four positions between the both ends of the middle shaft and between both end planes of the half-
coupling shall be tested respectively every 90°, and the difference hereof shall be controlled within
the range specified in Figure 2.3.4.
G—Interference of the horizontal guide key in the key fixing slot
2.5.3 The centering and leveling of the reference equipment in the unit shall meet the following
requirements:
1 The elevation and location of the equipment center shall meet the design requirements, and
the permissible deviation hereof is ± 2mm;
2 If a blower is adopted as reference, the longitudinal installation level hereof shall be tested
on the major axis, and the deviation hereof shall not be larger than 0.05/1000; the horizontal
installation level shall be tested on the casing split plane, and the deviation hereof shall not be larger
than 0.10/1000;
3 If a speed increasing gear is used as reference, the horizontal installation level shall be tested
on the casing split plane, the longitudinal installation level shall be tested on the master gear axle, and
the deviation hereof shall not be larger than 0.05/1000.
2.5.4 The centering and leveling of the non-reference equipment in the unit shall meet the following
requirements:
1 The longitudinal installation level hereof shall be centered and leveled subject to the reference
equipment; the horizontal installation level shall meet the requirements Article 2.5.3 in this code; the
direction hereof shall be consistent with horizontal installation level direction of the reference
equipment;
2 The end clearance, radial displacement and axial slope of the coupling shall meet the
requirements of the accompanying technical documents.
2.5.5 In the centering and leveling between motor/steam turbine/combustion turbine and speed
increasing gear/centrifugal blower, the coaxiality hereof shall meet the requirements of the accompanying
technical documents.
2.5.6 In the centering and leveling for the centrifugal blower, the joining between the bearing
seat/lower cover and the base shall meet the following requirements:
1 The partial clearance between the bearing seat and the base, or between the casing anchor
fluke and the base shall not be larger than 0.05mm;
2 The connecting bolt fixation between the bearing seat (with guide key) or the casing anchor
fluke and the base shall facilitate to thermal expansion of the casing, and the clearance between bolt
and bolt hole, and between nut and the base shall meet the requirements of accompanying technical
documents; if there is no requirement relevant, the clearance between nut and the base should be
0.03mm~0.06mm [Figure 2.5.6 (a)], and the bolt shall be placed in an eccentric way in the bolt hole
[Figure 2.5.6 (b)].
if there is no requirement relevant, it shall meet the following requirements:
1 If the working pressure is less than or equal to 1MPa, the clearance shall not be larger than
0.12mm; if the working pressure is larger than 1MPa, the clearance shall not be larger than 0.10mm;
2 If the clearance exceeds the values specified in Item 1 in this article, the reasons for this shall
be found out, and the interference or partial piling of the build-in component shall be removed; the
over tolerance due to the casing deformation may not be repaired if the clearance can be reduced after
tightening the bolt up and it has no effect on the machine assembly accuracy;
3 Between the joint surfaces, not specially required, shall be coated with sealing gum uniformly,
and no stuffing or cushion layer shall be added between the joint surfaces.
2.5.12 The assembling of the speed increasing gear shall meet the following requirements:
1 The assembling of the speed increasing gear with planetary wheel shall meet the requirements
of the accompanying technical documents;
2 The speed increasing gear bottom surface shall fit closely with the base; before tightening
the bolts up, they shall be inspected with a feeler gauge, and the partial clearance hereof shall not be
larger than 0.04mm;
3 The top clearance, side clearance and contacting of the bearing bush fitting the axle neck, as
well as the interference between the bearing bush and the bearing cover shall meet the requirements of
the accompanying technical documents; otherwise, they shall be adjusted;
4 The center distance, parallelism, tooth side clearance and tooth surface contact between the
axles in the gear set shall meet the requirements of the accompanying technical documents;
5 The partial clearance of the acceleration box split plane shall not be larger than 0.06mm;
6 The inspection and adjustment of the contact trace and pattern on gear pair shall meet the
following requirements:
1) Tooth surfaces on the master gear shall be coated with color uniformly, the pinion gear
shall be wiped up, and a certain resisting force shall be applied on the pinion gear. The
master gear is rotated for several times, the color trace coated on the pinion gear shall be
stuck with a rubber belt, and the color trace length shall meet the requirements of the
accompanying technical documents;
2) Before the test run, several tooth surfaces of the master gear shall be coated with a layer
of color non-dissoluble to oil; after the test run, the dynamic contact pattern shall be
tested according to the color shedding condition, and it shall meet the requirements of
the accompanying technical documents;
3) The gear contact pattern shall exceed 60% the gear effective width, and it shall concentrated
on the center of the meshing;
4) For high-speed circular arc speed increasing gear with cylindrical gear, the static contact
trace length hereof shall not be less than 70% the gear length, and the dynamic contact
pattern length shall not be less than 90%; the height from the contact position to the
tooth top, for raised tooth, shall be (0.45±0.2) times the normal modulus; for dished
tooth, it shall be (0.75±0.2) times the normal modulus; for speed increasing gear with
involute gear, the contact pattern length shall not be less than 70% the gear length, and
the height shall not be less than 50% the tooth depth;
5) If there is difficulty on simultaneous adjustment on both gear tooth contact and gear
wheel shaft line parallelism, the quality requirement on the gear contact shall be satisfied,
and the parallelism may not be adjusted.
2.5.13 The pipeline and the centrifugal blower shall not be connected in force; in the connection, the
movement of the fan coupling shall be monitored with a dial gauge. For re-inspecting the centering
and leveling accuracy of the centrifugal blower, the accuracy shall keep under the state or within the
allowable range before connecting.
2.5.14 The cycle flushing shall be conducted for oil pipe lubrication points, sealing and control of
oil pipe, as well as machine parts and component exposed to oil in a centrifugal blower, and it shall
meet the following requirements:
1 Flush with the lubricating oil specified by the accompanying technical document;
2 Open all throttling valves at the upstream of the lubrication points and keep the maximum
rate, before flushing;
3 Make the flushing oil temperature same as the unit working temperature, or apply cold or hot
oil alternately;
4 Frequently clean the oil filter and tap the oil pipe regularly during the flushing;
5 The flush time shall not be shorter than 24h;
6 The oil filter screen shall not leave hard particle; the pressure difference of the oil filter
before and after the flushing shall remain stable for 5 hours, under condition of same oil temperature.
2.5.15 In the test run for centrifugal blower, the driver shall be tested firstly, and the complete
machine later. For the complete machine, the air inlet restriction gate shall be opened to 10°~15° for
small load test run before normal load test run.
2.5.16 Besides the requirements of Article 2.1.12 in this code, the centrifugal fan before the test run
shall meet the following requirements:
1 The lubricating system, sealing system and hydraulic control system shall be washed and
cleaned according to the requirements of the accompanying technical documents, and the cycle
cleaning shall be conducted;
2 The specification and amount of the filled lubricating oil shall meet the requirements of the
accompanying technical documents;
3 The interlocking device for the lubrication, sealing and control systems, the anti-surge device
for the unit, as well as regulating device, valve and instrument for waterway system, shall be sensitive
and reliable; and they shall meet the requirements of the accompanying technical documents;
4 The valve and control device shall be under the initiating position specified by the
accompanying technical document to make the fan under the minimum load;
3 The installation position of snort valve and bypass valve shall meet the requirements of the
accompanying technical documents;
4 The horizontal oil return pipe lead to the oil tank shall have a slope of 1:25; oil piping made
of carbon steel shall be treated with pickling and passivating.
2.6.13 Besides the requirements of Article 2.1.12 in this code, the axial blower test run shall meet
the following requirements:
1 Before initiating, the air outlet valve shall be shut down, the emptying valve is opened, and
the stator blade angle shall be set to the minimum operating angle or closed starting state;
2 As for the turbine driven main engine, the speed shall be raised in stages according to the
climb curve, and the main engine shall not run at the nearby critical speeds of the shafting;
3 When the main engine initiates and reaches the normal speed, the stator blade should be
adjusted to the minimum working angle; the main engine shall not stay under closed starting state of
the stator blade for a long time;
4 The following inspections shall be carried out in the test run, and the machine shall meet the
technical requirements in test run:
1) The flow-rate and pressure of the cooling water shall not be less than the minimum
value;
2) The outlet temperature of the cooler shall be higher than the specified highest temperature
value;
3) The oil pressure before the bearing throttle shall not be less than the minimum value;
4) The inlet and outlet pressure difference of the lubricating oil filter shall not exceed the
specified value;
5) The snort valve and bypass valve shall be opened timely and correctly before surging;
the machine shall not run close to the surging area in the performance curve before the
surging curve is not tested and calibrated;
6) The bearing temperature and the bearing oil drain temperature shall meet the requirements
of Table 2.5.17-1;
7) The bear vibration velocity effective value shall not be larger than 6.3mm/s;
8) The running speed of the fan shall not exceed the specified highest speed.
5 The inspected and measured values in the test run shall be recorded clearly.
2.6.14 The closing-down of the unit shall meet the following requirements:
1 Before closing down, the stator blade angle shall be adjusted to the minimum working angle
or under closed position, and the emptying valve shall be opened and the air outlet valve shall be shut
down;
2 After closing down, the rotor shall be rolled slowly, and the lubrication pump shall be
stopped when the temperature of the major axis between the bearing and the main exhaust side is
3 Compressor
3.1 Basic Requirements
3.1.1 Before assembling, the cleaning and inspection of the compressor unit equipment shall meet
the following requirements:
1 Parts, components and attached equipment shall be free of damage and rust;
2 Parts, components and attached equipment shall be washed and cleaned, and the cleanliness
testing and its limits shall meet the requirements of the accompanying technical documents; if there is
no requirement relevant, they shall meet the requirements of Appendix B in this code; the cleaning
agent and water shall be removed completely after cleaning, and the machined surface shall be coated
with a layer of lubricating oil. Non-lubricated compressor and their parts and components exposed to
the media shall not be coated with oil; and gas valve, stuffing and other sealing elements shall not be
cleaned with vapor;
3 As for the compressor with the compression media of oxygen and combustible/explosive
gases, all parts, components, attached equipment and pipelines exposed to the media shall be de-oiled
according to the relevant requirements of “General Code for Construction and Acceptance of
Mechanical Equipment Installation Engineering” GB 50231; the oil residue content of the spare parts
exposed to oxygen shall not be larger than 125 mg/m2; after de-oiling, the spare parts shall be blown
dry with oil-free dry air or nitrogen, and the parts, components and pipeline ends shall be treated with
oil-free sealing;
4 In the cleaning inspection, the safety measures like labor protection , fire prevention, gas
defense and explosion protection, shall be taken;
5 Compressor or pressure vessel inside must not be checked with open fire.
3.1.2 The pipelines for a compressor and its attached equipment shall be applied with tightness test
at the maximum working pressure, and they shall have no leakage after pressure maintaining for
10min.
3.1.3 The engine body oil pool of a large compressor shall be applied with leakage test (with
kerosene), and the testing time shall not be shorter than 4h, the oil pool shall have no leakage.
3.1.4 The safety valve shall be installed on the position free of disturbance like vibration, and its
full-flow discharge pressure shall not exceed 1.1 times the maximum working pressure. if the rated
pressure is less than or equal to 10MPa, the set pressure shall be 1.1 times the rated pressure; if the
rated pressure is larger than 10MPa, the set pressure shall be 1.05 times~1.10 times the rated pressure.
The safety valve or interlock safety device, at all stages, of an oxygen compressor, shall ensure that
the inter-stage pressure does not exceed 25% the nominal value hereof, and the pressure at the last
stage does not exceed 10% the nominal value.
3.1.5 Connecting pipeline, joint and connection of the compressor shall be sealed free of leakage.
the discharged gas and liquid shall be recycled or led to a safe handling place.
3.1.6 When the compressor runs stably under the specified operating environment and at the rated
the cross pin shall meet the requirements of the accompanying technical documents;
5 Connecting rod bolt and nut shall be tightened up and locked firmly by the pre-tightening
force specified in the accompanying technical document.
3.3.6 The assembling of cross head shall meet the following requirements:
1 The contact surface area of the cross head slide foot and the slide track shall not be less than
60% the foot area;
2 The clearance between the cross head slide foot and the slide track on stroke positions shall
meet the requirements of the accompanying technical documents;
3 The assembling of the cross head for symmetrical balance compressor shall be conducted
according to the marks made by the manufacturer, and the piston rod axial line shall superpose with
the slide track axial line;
4 The connecting bolt and lock device for wrist pin shall be tightened up and locked firmly.
3.3.7 The assembling of piston and piston rod shall meet the following requirements:
1 The piston ring surface shall free of crack, inclusion and burrs;
2 The piston ring except nonmetal ring shall be applied with light leakage inspection in the
cylinder. the light leakage on the whole circle shall not exceed 2 points; the corresponding arc length
on each point shall not be larger than 36°; and the distance to the piston ring opening shall be larger
than corresponding 15° arc length;
3 The clearance between the piston ring and the piston ring groove end face, as well as the
opening clearance of piston ring put into the cylinder shall meet the requirements of the accompanying
technical documents;
4 The piston ring shall free run in the piston ring groove; pressed with hand, the piston ring can
sink into the groove; the location of the adjacent piston ring openings shall mutually staggered;
5 The radial clearance between piston and cylinder face, as well as the clearance from the
piston to the inside and outside dead points in the cylinder shall meet the requirements of the
accompanying technical documents;
6 The contact surface area of the bearing alloy piston supporting surface and the cylinder face
shall not be less than 60% the piston supporting cambered surface;
7 The piston rod, with piston, and piston rod, with cross head shall connected firmly, and
locked firmly.
3.3.8 The assembling of stuffing and oil wiper shall meet the following requirements:
1 Oil, water and air opening/line shall be clean and smooth;
2 The assembly sequence of stuffing ring shall not be changed;
3 The stuffing shall uniformly contact with the stuffing ring end face and the stuffing box end
face, and the contact surface area shall not be less than 70% the end face area;
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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