Equipment Clearance

Are you keeping two motor pump sets in a line ?

The clearance should be governed by

Vibration isolation (we have faced a lot of problem in this aspect), and in you case it will be on a single rail.

Effective cooling of the motor since the path of the motor fan air is likely to be blocked by the pump as well as its associated circuits. And if it forced air cooled fan then it will draw in the hotter air (from the hot pump as weel as pipe lines which are also likely to be quite a bit hotter than ambient)

BTW - I have not much used this configuration, even in radial fanned motors. The motors are a bit spaced apart for the first point. Even if the two are working in tandem. Since there is a bit of overlap when one of the pump is turned off and the other turned on to ensure continuous fluid supply (oil for our lubrication systems and there can not be any interruption and the machine trips automatically if the lube supply interrupts)

And, if possible, give a good clearance for pump installation and removal, with access to hoists and lifting devices (if equipment is heavy). Take care of your back and your collaborator's, avoid carrying heavy equipment in tight spaces.

What are standard codes that specifies the equipment clearance?

Need to know where in the world your application will be used before we can give you an answer on the "local" codes. Good practices will allow enough room for maintenance and access. Ambient temperature of space and confinement makes space requirements change. Is this application on a ship or in a stationary environment? Please supply a little more information. Additionally when I design a pump head I usually put the pumps together back to back. Allowing the motors to draw air from the ends blowing over th pumps to cool. This allows the pumps to be plumbed in with the minimal pipe runs. One motor will run in the opposite direction so the in and out of the pumps will be on the same side. (I work with 3 phase systems)

the application is of cooling water circulation motors in a cooling tower .the motors are 6.6KV motors.i am working in a refienry in india.