by Lev Nelik, Pumping Machinery, LLC
April 24, 2012

The standards for repair will begin with a standard for vertical turbine pumps.

The pump industry is undergoing renewed interest in the technical aspects and quality of repairs. Pump users’ expectations of quality repairs must be matched by a well-defined set of specifications, to clearly state the extent and details of a repair job. The first specification has been initiated by a working group of the Pump Magazine Online, with the cooperation of Pumps & Systems magazine.

The reviewers are in process of working on the second draft. Users, manufacturers and repair shop facilities’ input is encouraged, to provide an inclusive and well-rounded basis for the final document to serve pump industry needs in quality repairs and overhauls of pumps.

The original draft was reviewed in September 2011 by the Pump Magazine Online Advisory Committee, and a working group is now being put together to get the Vertical Turbine Pump (VTP) Pump Repair Standard (VPRS) draft to the next step. For those interested, we can review your level of interest and background and include you in this group (see the list of group members at the end of this article). 

The initial draft documents are the result of ongoing development, some of which has been published and featured in my Pumps & Systems’ columns:

These articles can be found on

Table of Contents

The committee outlined several initial sections of the VPRS Standard, which are now being developed in detail. Additional sections will likely be added and/or modified. The initial table of contents is below:

Section 1: Vertical pump and driver condition monitoring prior to removal for service

1.1 Predictive versus proactive maintenance and monitoring

1.2 Catastrophic failures

1.3 Possible root causes of failures and RCA (root cause analysis)

1.4 Site inspection and system issues potentially affecting pump performance and reliability

Section 2: Pump and driver pre-removal planning

2.1 Site access and selection of lifting and transportation option

2.2 End user versus contractor responsibilities

2.3 Turnkey versus partial approach

2.4 The anticipated extent of the repair, overhaul and upgrade (with definitions)

2.5 Quotation process

2.5.1 Level 1 (basic repair)—with definitions

2.5.2 Level 2 (extended repair)—with definitions

2.5.3 Level 3 (complete overhaul)—with definitions

2.5.4 Upgrade options: materials, hydraulics, controls, monitoring

Section 3: Driver handling

Section 4: Open versus enclosed shaft design options

Section 5: Complete pump removal versus sectional removal

Section 6: Materials of construction

6.1 Cavitation protection

6.2 Abrasion resistant

6.3 Corrosion resistant

6.4 Combined

Section 7: Sump, piping and system effects

7.1 Anti-vortex methods

7.2 Air entrainment and minimum submergence required

Section 8: Repair shop inspection procedures

8.1 Disassembly and visual inspection

8.2 Shaft runout

8.3 Bushing clearances

8.4 Non-destructive examination if/when required 

8.4.1 Magnetic particle

8.4.2 Liquid penetration

8.4.3 Radiography

8.5 Witness inspection

Section 9: Re-installation in the field and start-up

Section 10: Documentation and record keeping