IS 4894 FOR CENTRIFUGAL FAN PDF
Comments. IS Code. Recent; Popular; Featured. IS – – Pallets for materials. Buy BIS IS (R) SPECIFICATION FOR CENTRIFUGAL FANS from SAI Global. Standard Air. Centrifugal fans for use in mines and hazardous atmospheres may requirt: additional requirements to be met, not covered by this standard.
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Such an addition shall then be regar- ded as a part of the fan. The resistance measurement shall be made with a current of lOA with a dc voltage not exceeding 6V. In the case of indirectly driven fans, the electric motor shall conform to the relevant Indian Standard, 1. The absolute pressure of the ambient atmosphere is the barometric pressure.
Part 1 Methods of testing performance’, issued by the British Stand- ards Institution. Note — In this specification, the term ‘fan’ shall be used to mean centrifugal fan as supplied, without any addition to the inlet or outlet, except where such addition is specified.
IS 4894: Centrifugal fans
Details of conditions under which a licence for the use of the Standard Mark may be granted to manufacturers or producersmay be obtained from the Bureau of Indian Standards.
These are intended to prove general quali- ties and design of given type of fan. This is normally shown in graphical fashion, following performance tests carried out in accordance with This is also commonly known as wheel diameter.
The following additional information in respect of an electric centrifugal fan shall be supplied by the manufacturer on request: Note — The need for specifying limits of noise levels acoustical of the fans is recognized. If the number of defectives found in the first sample is less than the rejection number, take a second sample of size indicated in col 3; and if the total number of defectives in the first and second sample put together is less than the rejection number, accept the lot, otherwise not.
Search the history of over billion web pages on the Internet. This test shall be carried out with the guard if any, in position. Centrifugal fans [ETD 5: For routine and acceptance tests, instruments of class index 2 may be used.
The method of measurement of the speed of fan shall be such that the speed of the fan is not appreci- ably affected. The other limbs of the manometer shall be opened to the ambient atmosphere and the manometer reading shall be taken as equal to the average static pressure in the airway.
Part 1 General requirements second revision. While taking the current and watt read- ings during these tests, however, the voltage shall be maintained at the test voltage.
Such fans shall be specially marked. The following information in respect of an electric centrifugal fan shall be supplied by the purchaser on request: A recommended sampling plan cfntrifugal given in Table 3. Standard marked products are also continuously checked by BIS for conformity to that standard as a further safeguard.
This value shall fall within the range of specified tolerances.
Full text of “IS Centrifugal fans”
Intermediate values of d, may be obtained by linear interpolation. In the case of a double insulated fan, both basically insulated parts and live parts shall not be accessible to the standard test finger.
The stray load loss is assumed to be percent of the shaft power. In the case of inductance type regulator, it is essential that no portion of the inductive winding should remain permanently short-circuited in any of the running positions. In case of doubt, the tests shall be carried out at all voltages. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.
Proper types of bearings should be used to ensure a reasonable amount of silent operation. Part 55 Electric fans. If the fan is specified for two or more distinct rated voltages with three or more supply terminals, the tests shall be carried out at the most unfavourable voltage. The most probable operating point for the fan shall be at the intersection of the fan characteri- stic and the system resistance line. All metallic parts associated with it shall be protected from accidental contact.
Note — The trade name, voltage and the size of the fan shall be marked on associated regulator.