This standard specifies the requirements, test methods, inspection rules, marking, packaging, transportation and storage of centrifugal and vortex pumps of ship (hereinafter referred to as: pumps).
This standard is applicable to the design, manufacture and delivery of various sea water pumps, fresh water pumps and oily water pumps used in ship cooling system, bilge ballast system, circulating water system, fire fighting system, auxiliary boiler water supply system, daily water supply system, etc.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments to (excluding corrections) to, or revisions of, any of these publications do not apply. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. For undated references, the latest edition applies.
GB/T 191-2000 Packaging - Pictorial marking for handling of goods (eqv ISO 780: 1997)
GB/T 569-1965 Marine pipe flanges - Connection dimensions and mating face
GB/T 699-1999 Quality carbon structure steel
GB/T 1176-1987 Specification for cast copper alloys (neq ISO 1338: 1977)
GB/T 1220-2007 Stainless steel bars
GB/T 1348-1988 Spheroidal graphite iron castings
GB/T 2501-1989 Marine pepe flanges-Connection dimensions and mating face (neq ISO 2084: 1974)
GB/T 3214-2007 Methods for measurement of capacity of pump
GB/T 3216-2005 Rotodynamic pumps - Hydraulic performance acceptance tests - Grades 1 and 2 (ISO 9906:1999, MOD)
GB/T 4423-2007 Copper and copper-alloy cold-drawn rod and bar
GB/T 5661-2004 End-suction centrifugal pumps - Dimensions of cavities for mechanical seals and for soft packing (ISO 3069: 2000, MOD)
GB/T 9239.1-2006 Mechanical vibration - Balance quality requirements for rotors in a constant (rigid) state - Part 1: Specification and verification of balance tolerances (ISO 1940-1: 2003, IDT)
GB/T 9439-1988 Grey iron castings
GB/T 13306-1991 Plates
GB/T 13384-1992 General specifications for packing of mechanical and electrical product
GB/T 16301-2008 Measurement and evaluation of vibration severity for marine engine-room auxiliaries
CB/T 43 Marine cast iron flanges
CB/T 44 Marine cast steel flanges
CB/T 45 Marine cast copper flanges
CB/T 46 Marine lap welded steel flanges
JB/T 8097-1999 Methods of measuring and evaluating vibration of pumps
JB/T 8098-1999 Methods of measuring and evaluating noise of pumps
3 Symbols and abbreviations
3.1 The symbols and meanings used in this standard are as follows:
1: inlet
2: outlet
a: apparatus
C: critical
r: required
rms: root-mean-square limit value
SP: rated
3.2 The abbreviations used in this standard are as follows:
NPSH: net positive suction head
(NPSH)a: net positive suction head of apparatus
(NPSH)C: critical net positive suction head
(NPSH)r: required net positive suction head
4 Design and structure
4.1 Minimum operating clearance
For bronze, 11%~13% hardened chrome steel and materials with similar low occlusal tendency, the minimum operating clearance shall meet those specified in Table 1. For the diameter above 150mm, the minimum operating clearance shall be 0.43mm+0.025mm, of which 0.025mm is the clearance increment for each 25mm increase in diameter. For materials with larger occlusal tendency and working temperature higher than 260℃, the above-mentioned diameter clearance shall be added by 0.125 mm.
When bronze materials are used to transport clean fluid with a temperature below 50℃, the manufacturer/supplier can adopt a clearance smaller than the value specified in Table 1.
