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International Standard for Centrifugal Pumps

Quiz Questions

1. Unless otherwise specified, the pump vendor
shall have unit responsibility.
Is not responsible for sub-vendors not complying with the requirements of the International Standards.
2. The foot mounted, single-stage overhung pump type OH1, in Figure 1 (according to table 3):
Is the most suitable pump for International
Does not meet all the requirements of this International Standard
3. In Figure 20 , typical gusset design shall be located at or near the connection end of the piping and fitted to the closest convenient location on the casing to provide:
Maximum rigidity
Flexibility on the structure.
4. The coordinate systems (s) shown in Figure 21 through 25 shall be used to apply the forces and moments in
Table 5
Table 3
5. Pumps shall be equipped with mechanical seals and sealing systems in accordance with ISO 21049. Pump and seal interface dimensions shall be in accordance with table 7 and Figure 26 of this International Standards. The purchaser shall specify the category of seal required. The purchaser should use the data sheets in ISO 21049 for this purpose.
6. Which one of the torsional analysis below is generally performed on pumps.
Undamped natural frequency analysis
Steady-state damped response analysis
Transient torsional analysis
All of the above
7. For horizontal pumps at any speed greater than the maximum continues speed, up to and including the trip speed of the driver, the vibration shall not exceed 150% of the maximum value recorded at the maximum continues speed.
8. Variable-speed pumps shall operate over their specified speed range
Without exceeding the vibration limits of this International Standards
Regardless of the vibration range or limits.
9. Impellers, balancing drums and similar major rotating components shall be dynamically balanced to ISO 1940-1, grade G2.5 The mass of the arbour used for balancing shall not exceed the mass of the component being balanced. Shafts are
Not required to be balanced
Also required to be balanced
10. According to Table 11 the Non-pressure-retaining structural welding, such as baseplates or supports should be performed based on:
ISO 10721-2
ASME BPVC VIII, Division 1, UG-93(d)(34)
11. In testing at least 6 weeks before the first scheduled running test, the vendor shall submit to the purchaser, for his review and comments, detailed procedures for all running tests and all specified optional tests
12. The intent of a hydrostatic test of a centrifugal pump casing is to;
Ensure that the construction of the pump are leak free from ambient pressure to maximum allowable pressure
Ensure that the pump does not do cavitation.
13. All pressure casing components shall be hydrostatically tested as assemblies. The test conducted with a liquid at a maximum
2 times the Max allowable working pressure
3 times the Max allowable working pressure
1.5 times the Max allowable working pressure
14. The vendor shall forward the original proposal and the specified number of copies to the addressee specified in the inquiry documents. As a minimum, the proposal shall include the data specified in 10.2.2 through 10.2.5, as well as a specific statement that the system and all its components are in strict accordance with this International Standards.
15. Figure 2 is
Pump type OH2
Pump type OH3
16. Fig 4 is a type OH4. This type of pumps
Meets all the requirements of international Standard, Table 3
Does not meet all the requirements of international Standard, Table 3
17. The purchaser and the vendor shall mutually determine the measures necessary to comply with any governmental codes, regulations, ordinances, or rules that are applicable to the equipment, its packaging and preservation.
18. The equipment (including auxiliaries) covered by this International Standard shall be designed and constructed for minimum service life of 20 years ( excluding normal-wear parts as identified in table 20) and at least 3 years of uninterrupted operation.
19. The purchaser does not have to specify any operating condition, pressure, or liquid property
20. The pumps that handle liquids more viscous than water do not have to correct their water performance in accordance with ISO/TR 17766