c.
Liquid Penetrant - Inspection shall conform to the applicable
provisions of ASTM E 165.
2.1.4.2
Acceptance and Repair Criteria
Acceptance and repair criteria shall be in accordance with Section 05055A
METALWORK FABRICATION, MACHINE WORK, MISCELLANEOUS PROVISIONS.
2.2
VERTICAL PUMPS
2.2.1
Speed
**************************************************************************
NOTE: Select appropriate alternate paragraph.
Alternate 1 is used when cavitation testing is part
of the contract. Alternate 2 is used when the pump
will not be tested to determine the cavitation
characteristics and the designer has determined the
maximum speed to be specified based on the NPSHA.
The following criteria should be used by the
designer in determining the maximum rotative speed:
(SS) x (NPSHA)3/4
Nss = --------------------
Q1/2
where:
Nss = pump rotative speed, in revolutions per minute
SS = suction-specific speed
Q = flow, in gallons per minute
NPSHA = net positive suction head available
Maximum value of SS to be used in the formula:
SS
= 8,500
A more conservative value of suction specific speed
may be used when operating for extended periods of
time above or below optimum efficiency point.
**************************************************************************
[Rotative speed of pump shall be no greater than [_____] r/min rpm. Verify
that rotative speed of pump at which the NPSH is produced is no less than
required, as determined by cavitation tests specified in paragraph FACTORY
TESTS (Alternate 2).]
[Rotative speed of pump shall be no greater than [_____] r/min rpm.]
2.2.2
Reverse [Rotation] [Flow]
**************************************************************************
NOTE: Select appropriate alternate paragraph:
Reverse Rotation (Alternate 1) and Reverse Flow
(Alternate 2). Alternate 1 is used when the pumping
unit does not have a non-reverse device. Alternate
2 is used when the pumping unit is equipped with a
non-reverse device.
SECTION 15131A
Page 21
Previous Page
