Why installation records matter
Many compressor problems that appear in the first year are installation problems: hot rooms, recirculating exhaust air, undersized cables, water in a header with no drain legs, or a dryer piped in without a bypass. When a plant engineer can see exactly what was installed and tested, these problems are found faster and responsibility is clear. A good record also makes later service, relocation and spares identification far easier.
We use the record to answer four questions:
- What was the agreed duty and scope?
- What equipment was actually installed, and how was it connected?
- What was tested, by whom, and with what result?
- What did the customer accept, and what was left open?
Agree the scope before work starts
The scope document controls the job. It should list:
- The required free air delivery (FAD) and working pressure, in bar and psig, and the air quality class needed at the users.
- The equipment to be supplied: compressors, dryers, filters, receivers, drains, controls.
- Who provides what: foundations, cabling, isolators, piping, ventilation ducts, lifting.
- Interfaces with existing plant, such as tie-ins to a header or a sequencer.
- Tests to be done at commissioning and who will witness them.
- Exclusions, stated plainly.
Most disputes after installation trace back to an interface no one owned, such as the cable from the plant panel or the ventilation duct. Writing those down at the start avoids them.
Installation milestones
| Milestone | What it means | Typical evidence |
|---|---|---|
| Delivery | Equipment arrived complete and undamaged | Delivery documents, packing list check, photos of condition on arrival |
| Mechanical installation | Equipment placed, levelled and connected | Placement check against layout, pipework and drain connections inspected |
| Pre-commissioning | Ready for safe first start | Electrical checks, rotation check, oil levels, valves set, safety devices in place |
| Commissioning | Equipment run and tested under load | Test sheet with pressures, temperatures, currents, alarms and trips tested |
| Handover | Customer accepts the installation | Signed handover with open points listed, operator briefing recorded |
| Operational check | Performance confirmed in normal use, if agreed | Follow-up readings after a defined period |
If a project is called “commissioned”, the record should show what tests were done. If only a start-up was done, it is described as a start-up.
Equipment identity
Each item is recorded with manufacturer, model, serial number and nameplate details: rated pressure, FAD, motor or engine rating, voltage, and the controller type. Dryers, filters and receivers are listed the same way, with the receiver’s design pressure and its safety valve setting. Any deviation from the agreed equipment list is noted with the reason. Nameplate photos are kept in the file, because they are the quickest way to identify spares years later.
The record also distinguishes the maker’s rated FAD from flow measured on site. Unless a flow test was carried out, the record quotes the rating, not a measured figure.
Site readiness: the compressor room
The compressor room decides much of a machine’s life. In Hyderabad and across Telangana and Andhra Pradesh, summer ambient temperatures of 40–45 °C, dust and occasional voltage swings are the main threats. Before installation we check and record:
- Ventilation: enough cool air in, hot air ducted out, and no recirculation of exhaust air back to the intake. A compressor room that runs well above outside ambient will cause high-temperature trips in summer.
- Intake air: drawn from a clean, shaded area, away from boiler flues, solvent stores and dusty roads.
- Floor and supports: level, strong enough for the package, with any anti-vibration mounts or foundation work the maker requires.
- Service clearances: enough space around the package to change coolers, filters, motors and separator elements.
- Drainage: condensate routed to an oil-water separator rather than an open drain.
- Electrical supply: correct cable size, isolator, protection and earthing, checked against the motor rating and starting method.
Our compressor room installation page covers layout and ventilation in more detail.
Pipework, treatment and controls
Connections to the plant are where many installations fall short. The record shows:
- Discharge piping with an isolation valve and, where needed, a flexible connection to stop vibration reaching the header.
- Receiver position, drain type and safety valve.
- Dryer and filter arrangement in the correct order, with bypass valves for service and differential pressure gauges on filters.
- Header take-offs from the top of the pipe and drain legs at low points.
- Control wiring to a sequencer or plant system, with set pressures recorded.
Set pressures matter for energy: as a rule of thumb, each extra bar of generation pressure costs about 7% more power. The record should note the load and unload or target pressures set at commissioning, and why.
Commissioning tests
A commissioning test sheet should record measured values, not ticks. Typical checks are:
- Rotation, oil level and pre-start checks.
- First start, run unloaded, then load in steps.
- Discharge pressure and temperature at load; an oil-injected screw normally runs at about 75–95 °C discharge temperature.
- Motor current at full load compared with the nameplate.
- Load and unload or modulation behaviour against the set pressures.
- Safety trips and alarms tested where the maker’s procedure allows: emergency stop, high discharge temperature, motor overload.
- Dryer start-up and pressure dew point once stable; a refrigerated dryer typically settles at about +3 °C PDP.
- Drains cycling and leak check on new connections.
- Operator briefing on start, stop, alarms and daily checks.
Our commissioning, start-up and acceptance page sets out the full method.
Handover and open points
At handover the customer signs to accept the installation, with any open points listed: a missing duct, a drain to be relocated, a reading to be repeated in summer. Each open point has an owner and is closed in writing. The customer receives the test sheet, nameplate photos, the maker’s manuals and a first maintenance schedule.
As an example from our own work, on a temporary air package for a thermal power project in Karnataka our team delivered a 400 cfm electric compressor, commissioned it within one to two days of arrival, trained operators and supplied a preventive maintenance schedule. For a natural-gas development in Andhra Pradesh, our team across Reddy Generators and Reddy Compressors handled erection, commissioning and transport of a combined compressor and generator package.
The documentation pack
A verified installation leaves the customer with a file that a new maintenance engineer could pick up years later and understand. We aim for a pack that contains:
- The agreed scope and any later changes, with dates.
- An equipment list with nameplate photos and serial numbers.
- A simple layout sketch of the room, showing ventilation openings, ducts, drains and the main isolation valves.
- A pipework sketch from compressor discharge to the main header, including the dryer, filters, bypasses and receiver.
- The commissioning test sheet with measured values and set pressures.
- The signed handover, open points and their closure.
- The first maintenance schedule and the spares list for the first service.
Keeping this pack up to date after each service or modification is one of the simplest ways to cut fault-finding time later.
What we will not claim
- Structural adequacy of floors or foundations; that is for a structural engineer.
- Electrical installation compliance beyond the checks we carried out; that rests with the licensed electrical contractor.
- Measured flow or efficiency unless they were actually tested.
- Customer names or results without written permission.
How Reddy Compressors helps
Reddy Compressors, at Tarnaka, Secunderabad, has served industry since 2002. We are an independent multi-brand business and not an authorised dealer of any brand. We have tie-ups with all major and reputed brands. For installations we:
- Supply new and used or refurbished compressors, dryers, filters and receivers from ELGi, Atlas Copco, Ingersoll Rand, KAESER, Chicago Pneumatic and other makers.
- Survey the compressor room and advise on ventilation, layout, pipework and treatment.
- Install, commission and hand over with a recorded test sheet.
- Relocate and recommission existing machines.
- Provide service, AMC and spares afterwards, with over 20 service engineers and technicians covering Telangana and Andhra Pradesh, and supply across India.
- Supply rental compressors to keep air on while a new installation is completed.
What to send us
- Required flow, pressure and air quality, or details of the machine being replaced.
- Photos and dimensions of the compressor room, including openings for ventilation.
- Available electrical supply and the panel location.
- A sketch of the main header and where the new equipment connects.
- Nameplate photos of any existing compressors and dryers.
- Your site location and target date.
Frequently asked questions
What should a compressor commissioning report include?
It should record the equipment identity and nameplate data, pre-start checks, measured discharge pressure and temperature, motor current, load and unload pressures, dryer dew point, safety trips tested, leak checks and the operator briefing. It should list open points with owners and be signed by both parties. Ticks without measured values are not enough.
How much ventilation does a compressor room need?
Enough to carry away almost all of the compressor’s input power as heat without the room temperature rising much above outside ambient. The maker states the cooling air flow for each package. Hot air should be ducted out, and intake air drawn from a cool, clean area, which is especially important in a hot Indian summer.
Can you install a compressor of any brand?
Yes. As an independent multi-brand business we install and commission compressors from ELGi, Atlas Copco, Ingersoll Rand, KAESER, Chicago Pneumatic and others, following the maker’s installation instructions. We are not an authorised dealer, so for warranty-sensitive work we advise you to check the maker’s conditions first.
Why does my new compressor trip on high temperature?
The most common causes after a new installation are poor room ventilation, hot exhaust air recirculating to the intake, blocked coolers, low oil level or a ducting restriction. Ambient heat in summer makes all of these worse. We check room temperature, cooling air paths and oil temperatures to find the cause.
Do I need a dryer bypass when installing a new compressor?
A bypass with isolation valves lets the dryer or filters be serviced without stopping the air supply. It must be kept closed in normal running, because an open bypass sends wet air into the plant. The record should note the bypass valve positions at handover, and the operator briefing should explain its use.
Can you relocate and recommission an existing compressor?
Yes. We dismantle, move, reinstall and recommission existing compressors, dryers and receivers. Before restarting we inspect the machine, change oil and filters where needed, and test it as we would a new installation. A rental compressor can keep the plant supplied during the move.
Related pages
Technical content reviewed by D. Srinivas Reddy, Managing Partner and service engineer, Reddy Compressors. Last updated 17 October 2026. How our engineering content is reviewed.