How to use a 100 litre air compressor
Updated: 21.10.2026
The first hour with a 100 litre compressor is mostly about where it stands and what you plug it into. If you have just unboxed a 230 V receiver for a UK garage, this is how to use a 100 litre air compressor without treating the tank as a step, a workbench, or a reason to run a long extension reel. The procedure is the same shape for the four machines in the [100 L air compressor comparison](/hub/compressors/100l-air-compressor): level stance, a proper socket, one pressure cycle, the regulator set to the tool, then a drain. Steps below follow the manufacturer notes and HSE guidance in the sources. This is not a lab test. A qualifying purchase can earn a commission at no extra cost to you.
The first hour with a 100 litre compressor is mostly about where it stands and what you plug it into.
The first hour with a 100 litre compressor is mostly about where it stands and what you plug it into. If you have just unboxed a 230 V receiver for a UK garage, this is how to use a 100 litre air compressor without treating the tank as a step, a workbench, or a reason to run a long extension reel. The procedure is the same shape for the four machines in the 100 L air compressor comparison: level stance, a proper socket, one pressure cycle, the regulator set to the tool, then a drain. Steps below follow the manufacturer notes and HSE guidance in the sources. This is not a lab test. A qualifying purchase can earn a commission at no extra cost to you.
Our top picks
| Badge | Product | Oil on first start | Supply | Drain after use | Note | Price | Offer |
|---|---|---|---|---|---|---|---|
| Best overall |  Sealey Sealey SAC10030VA 100L | 350 ml in the instructions | 13 A, no extension lead | Yes, water may carry oil | 4.7 | about £351.23 | View offer |
| Preis-Tipp |  TIGREN TIGREN V100DD 100L | Splash, capacity not on Amazon | 230 V stated | Yes, water may carry oil | 6.7 | about £347.99 | View offer |
 SIP SIP Airmate 100L vertical | None, oil-free | 1.3 m lead, 13 A plug | Yes, water still collects | 7.2 | about £479.98 | View offer |
On this page
Before you switch it on
Put the compressor on a firm, level floor, with the wheels or feet it was built with, and leave the pump upright. A 100 litre receiver is a pressure vessel of about 50 to 60 kg in this set. It is a poor thing to tip so that you can paint behind it, and a worse thing to use as a hop-up. If you have moved a lubricated machine on its side in the car, stand it level and leave it before you start, so oil can return to the sump.
Check oil only if the pump has a sump. Both SIP Airmate listings in this set are oil-free, so there is no oil to add on first start. The TIGREN is splash-lubricated. Amazon does not state an oil capacity, so you use the sight glass or the manual that arrived with that model. Sealey’s instructions for the SAC10030VA list 350 ml. That figure is the manufacturer manual, not the Amazon page. Which pump needs oil is decided on the oil-free or oil page.
Feed the pump from a 13 A wall socket on a 230 V circuit. The vertical SIP includes a 1.3 m cable with a 13 A plug. Sealey’s instructions for the SAC10030VA say extension leads are not recommended. A long reel drops voltage, the motor works hotter, and a cheap reel can be the part that fails. Close the outlet, check that the drain cock is shut, and stay with the machine for the first run. If the plug, the cable, or the breaker becomes hot, switch off and unplug.
First pressure cycle and the regulator
Switch on and let the pump fill the receiver. On the listings that state a maximum, cut-out is about 8 bar, which is 116 psi. You are listening for the motor to stop when the tank reaches that region, and to start again after you use some air. A safety valve that lifts and keeps blowing, a leak you can hear at a fitting, or a motor that never cuts out is a reason to switch off, not a reason to turn the regulator up.
The tank gauge shows what is stored. The regulator sets what leaves in the hose. Turn the regulator down before you connect a tool, then raise it to the pressure that tool’s own manual asks for. Follow the pressure this machine’s manual gives, and keep your face away from the outlet while you set it. A regulator does not raise the 8 bar cut-out, and it does not increase free air delivery. If a spray gun or a grinder fades while the trigger is held, the pump is delivering less than the tool is using. That limit is on the buying guide. This page does not rank the four models.
Connect the hose to the regulated outlet, check the coupling is fully home, and start with a short burst. Nailers and tyre inflators use air in clicks, so the pump should spend part of the job stopped. A motor that runs without pause for a long spraying session is telling you the demand is at the edge of what this pump can do.
Draining condensate
Compression heats moist air, and the tank cools it, so water collects in the receiver. An oil-free pump does not stop that. Both SIP Airmate machines still need a drain after use, even though you never add oil. Air Supply’s UK note describes the habit as daily, or after every use: switch off, release the pressure, open the drain, and close it again.
Do it in this order. Switch off and unplug. Let the stored pressure down through the regulator with a blow gun or the outlet pointed away from you, your face clear of the stream, until the gauge is at the low pressure your manual describes. Do not copy a leftover 10 psi line from a different brand’s American manual. Open the drain at the bottom of the tank and catch the water in a tray. On a lubricated pump that water can carry oil mist, so keep an oily trickle out of a kitchen drain. Close the drain fully before the next job. If you leave it cracked, the pump will run and never store air.
Skipping the drain because the pump is oil-free is how a receiver rusts from the inside. HSE’s HSG39 treats a weakened receiver as a real hazard. The statutory citations inside that priced publication are older than the Pressure Systems Safety Regulations 2000. The hardware point still stands, and the work duty is the one in HSE INDG178.
When to stop
Stop and unplug if the plug or the lead is hot, if you smell hot insulation, or if the breaker trips as soon as the motor starts. That is an electrician’s job, or a return to the seller, not a longer extension lead. Stop if the shell is dented or heavily rusted, if a weld weeps, or if the safety valve lifts during ordinary filling. A relief valve that opens at the right pressure and then seats can be doing its job. A valve that chatters or stays open needs a competent person, not a piece of tape.
At home, with no employees, a written scheme is not the switch-on step. The Pressure Systems Safety Regulations 2000 put that duty on workplace use. A 100 litre receiver at 8 bar is 800 bar litres, above the 250 bar litre example in INDG178, so an employer should have the scheme before staff use the system. You also stop using the airline as a way to blow dust off your skin or your clothes. Compressed air into the skin is an injury.
Changing the oil on a TIGREN or a Sealey, once the manual’s interval arrives, is owner maintenance. The used oil goes through your council’s household or trade oil route. It does not go down the tank drain with the condensate. If the vessel itself looks damaged, a fitter outranks a general page.
Common questions
Where does the compressor have to stand?
On a firm, level floor, pump upright, with space around the fan and the drain cock. Keep it off a slope that lets a splash-lubricated sump run towards the outlet. Do not stand on the tank to reach a shelf. The vertical SIP is about 115 cm tall, so check the shelf above it before you roll it into place.
Should I use an extension reel?
Sealey’s instructions for the SAC10030VA say extension leads are not recommended, and the vertical SIP is supplied with a 1.3 m 13 A lead. Use a wall socket. A long reel is how these 2.2 kW motors see a voltage drop. If the socket is the wrong side of the garage, move the compressor or have a proper outlet fitted.
What pressure do I set for the tool?
Set the regulator to the pressure in that tool’s manual, after the tank has reached cut-out at about 8 bar or 116 psi on the listings that state it. The regulator feeds the hose. It does not change the pump’s cut-out or its free air delivery. Keep your face off the outlet while you adjust it.
How do I drain the tank after a job?
Switch off, unplug, and release the pressure away from your face until the manual’s low figure is on the gauge. Open the bottom drain into a tray, let the water out, and close the cock. Do this after the job, and on a daily-use machine do it each day. Air Supply describes that same order.
Does an oil-free compressor still need draining?
Yes. The SIP Airmate listings are oil-free, and the tank still condenses water from the air you compress. Draining is about the receiver, not about the sump. Leave the drain shut again before you switch on, or the pump will run without storing air.
What do I check if the pump is oil-lubricated?
Level stance, then the oil mark, before the first start and at the interval in the manual. The TIGREN is splash-lubricated and Amazon states no capacity. Sealey’s SAC10030VA manual lists 350 ml. If you tipped the machine in transit, stand it and recheck the level before you run it. Used oil goes to a council oil route.
When do I stop and call someone?
When the shell is dented or rusted through, when the safety valve will not reseat, when the plug or breaker shows an electrical fault, or when employees use the receiver and there is no written scheme. Those are competent-person jobs. A normal cut-out, a regulator adjustment, and a drain are the parts you do yourself.
Related pages
Sources
Public UK sources and manufacturer pages below. amazon.co.uk listings checked on 20 October 2026.
- HSE INDG178: Written schemes of examination (retrieved 20 October 2026)
- Pressure Systems Safety Regulations 2000, regulation 8 (retrieved 20 October 2026)
- HSE: Noise at work, employers (retrieved 20 October 2026)
- Control of Noise at Work Regulations 2005, regulation 4 (retrieved 20 October 2026)
- GOV.UK: Pressure Equipment (Safety) Regulations 2016 (retrieved 20 October 2026)
- BCAS fact sheet 851 (retrieved 20 October 2026)
- Sealey SAC10030VA product page (retrieved 20 October 2026)
- Sealey guide to compressors (retrieved 20 October 2026)