Vendor Drawing - Pumps and Compressors

Mounting information very important. Foundation, distances, positions

same for compressors

"Mounting information very important" per phoenix911

Relative location of inlet/outlet to mounting surface, if designing your piping with CAD.

I'm going to be a bit more specific than the previous posts. These vendor drawings are commonly referred to as "elevation drawings" Location information in three coordinates is required.

With regard to pumps (compressors are not part of my game):

Dimensional locations (with tolerances) of all liquid connections to the liquid end. With respect to the type of connection a description of the type and size and applicable standard specification. With respect to bolted flange connections a drawing detail showing the orientation of bolt holes is required unless the pipe fitting connection standard spec contains this information. This orientation information is neither needed nor appropriate for threaded pipe or tube fitting connections

Location and sizes of mounting bolt holes or other features with respect to piping connections. Bolt holes if threaded should have size and thread depth given. In the case of simple round mounting bolt holes the thickness of the foot or other feature must be given. All dimensions should have tolerances given unless controlled by applicable standards which are specified.

If a prime mover such as an electric motor, turbine or combustion engine is provided by the pump manufacturer the location and size/spec of connections for energy input and exhaust, control and instrumentation connections and maintenance access (in the case of engines and turbines) locations should be shown.

Motor controllers and other control and auxiliary equipment for prime movers if provided but not actually mounted integrally to the pump or base plate should have mounting and connection dimensions presented. Unless specifically required by the customer order their location relative to the pump are not shown.

Overall envelope dimensions including base plate or mounting foot sizes as well as location of principal rotating centerlines of pump, prime mover and any intermediary power transmission devices should be shown.

The images of both pump and prime movers should be considered to be approximate and should not be scaled or used for system design unless specifically required by the sales contract. A note to this effect should appear on the elevation drawing.

The elevation drawing should contain specific information on the manufacturer and model designation of the pump and the make and model designation of the prime mover. Also rated power and rpm of the prime mover is appropriate.

If possible actual serial number of the pump and any additional specifications or instructions required by construction personnel to complete the installation of the pump and prime mover should be referenced on the final submission of the elevation drawing for each specific order.

Additional to the elevation drawing is the performance curve for the pump. This is typically an estimated (or guaranteed) performance capacity (flow rate) versus head (pressure), power required and efficiency with a specified liquid and at a specified RPM. A curve of NPSH vs. capacity may also be provided. The RPM will normally be the speed of the prime mover to be used with the pump. For variable speed prime movers the RPM on which the performance curve is based will have to be specified and agreed upon. If an additional test curve is part of the contract that should be so specified and will include reference to the pump serial number.

If you need an actual 3d solid model of the pump and prime mover for your engineering work best to verify that the manufacturer is able to provide you with that kind of information before you make serious commitments. Many pump types still in active production were designed before 3d CAD was in common use. It is reasonable to expect that pump manufacturers may not have accurate information on the complex external shapes of their products, especially the ones with large complex castings.

Hope this is helpful to you.......

Ed Weldon

Yeah it was really very useful information.

But my question is what r the diffeent things which a layout engineer should take care...

I mean there r thing whihc will be taken care by mechanical department, what r the specific thing which will be taken care by piping layout engineer while locating the Pump or compressor on plot plan.

I think the piping engineers are going to be interested in the location dimensions and the exact specs for all external pipe connections to the pump. That's what I mentioned in the first paragraph of my reply.

I can tell you more if you tell me what kinds and sizes of pumps you are working with.

Ed Weldon

Pipe size, elevation from intake/discharge, size (occupancy), controls (valves), seal flush system, electrical system, cooling, heating, and clearance for maintenance personnel.

Do the guys who maintain the equipment a favor and look at accessibility for maintenance purposes...