FM200™ SYSTEM | Pipework Pressure & Puff Test Template

Last Updated: August 13, 2023, by

Upon completion of any new FM200 pipework installation or modifications to an existing system, there will be a requirement to complete a pressure [40 psi for 10 minutes] and puff/flow test to ensure the system’s integrity before being put into permanent operation.

Below we will run through the following items using NFPA 2001, Standard on Clean Agent Fire Extinguishing Systems as a reference, the specific manufacturer’s information including any local codes/regulations should also be reviewed to ensure everything is captured.

  • Visual Inspections
  • General Information
  • Required Documentation
  • Tolerances and system details
  • Pneumatic Pressure Test Method
  • Puff / Flow Test Method
If want to read more on the FM-200 system, see our article 'FM200 SYSTEM | What is it?'

Who will complete and validate the FM200 pressure testing?

Due to the criticality of the system and method of test, pneumatic, possibly having significant health and safety implications, only engineers who are qualified and experienced in the works should conduct the testing.

Witnessing, where required would be the responsibility of clients representative, usually the Commissioning Provider or Facility Management Department, and they should make themselves available when needed.

Health & Safety

Health and safety should be a concern during these works due to the pressure and tasks being conducted.

Areas to consider would be:

  • Qualifications of operative
  • Installation/removal/filling and manual handling of FM200 cylinders
  • Installaiton and connection of system valves and controls
  • Working at height
  • Working with pressurized gas
  • Pneumatic pressure testing

Permit to work

Permit to work documents should be detailed and included to ensure that the relevant requirements to allow testing the equipment and pipework are met, items to include would be:

  • General access to site
  • Access to specific space equipment and pipework is located and,
  • Life safety system isolations

[see testing procedure at end of this article for example]

Documentation required

Prior to any testing starting, there will be a need for certain documentation to be available such as:

  • Completed and approved checklists
  • Approved material submission
  • Approved construction drawings showing installation
  • Completed and approved pre-functional testing checklist
  • Approved method statement or functional testing procedure
  • Self testing records [if system being witnessed by a third party]

Delivery Inspection Checks

Evidence should be obtained that prior to the pipework and/or FM200 system being accepted from the delivery company/supplier, a full check should be completed to ensure that the delivery meets the order and that the pipework and equipment are not damaged or anything missing.

Any damage or missing items should be notified to the supplier and delivery company immediately, with photographic evidence.

[see testing procedure at end of this article for example]

FM-200 Pneumatic Pressure & Puff Testing Method Statement Template [MS Word]


OPEN TEMPLATE of our PNEUMATIC PRESSURE & PUFF TESTING Method Statement including INSTRUCTIONS, that can be downloaded allowing editing and clean exporting for your project/company use.

All as per the format and layout shown in the sample document, at the end of this article.

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Storage Inspection Checks

If pipework is to be placed into storage after delivery then there will usually be a project requirement to complete a storage inspection checklist. This will evaluate the space/area where the pipework will be kept and how stacked and stored to ensure it is clean, safe, and protected from damage prior to installation.

[see testing procedure at end of this article for example]

Installation and Pre-Commissioning Inspection Checks

Through the construction process and prior to any testing there is usually a requirement to conduct various installation and pre-commissioning checks covering:

  • Pre-Installation
  • Maintenance and access
  • Pre-commissioning

These can be quite detailed and especially for this type of work and criticality of the FM-200 system.

[see testing procedure at end of this article for example]

Approved material submission

Although it seems a bit excessive, the approved material submission is useful and should be provided at the test to allow verification to prove that the materials and equipment used in the installation match and the client is getting what is paying for.

Approved construction drawings

Approved construction drawings should be provided and marked up with the testing area.

This is 1. to show where the testing will take place and, 2. to document the overall system testing for tracking purposes.

Self test records

If the pressure/puff/flow testing is being witnessed by a third party [commissioning provider, designer, facilities engineer], it should be fully self-tested prior to the witnessing.

This is to ensure that there are no issues and will reduce problems and return visits that could be claimed for.

Acceptance criteria & tolerances

A section in the testing documentation should be included to explain and describe any specific testing information such as system pressures, testing pressures, tolerances and testing times, etc.

For the FM-200 pipework pressure testing and puff/flow test we would include the below:

Code DocumentCode SectionTest InformationTolerance Allowed
NFPA 2001Chapter 10 []Using 40 psi / 276 kPa / 2.7 bar for a period of 10 minutesDrop not to exceed 80% of the initial test pressure
NFPA 2001Chapter 10 [10.4.15]Using nitrogen or inert gas conduct a Flow/Puff Test for a short durationn/a

Note: Inline with NFPA 2001 Chapter 10 [] – Pressure testing is not required if the pipework installation contains only one change of direction between the FM200 cylinder and discharge nozzle, as long as a fully comprehensive inspection has been completed for tightness.

Testing equipment

We should detail any equipment and instruments that are to be used during the testing, especially if they are to be calibrated.

For calibration, all equipment and instruments used will need a certificate that is in date matching the serial number.

Equipment TypeCalibration Certificate expiry dateModelSerial Number
Pressure Gauge
Temporary Pressure Rated Hoses
Caps for blanking heads
Nitrogen or Inert Gas
Temperature & Humidity Handheld Sensor
Ribbon for Puff Test
Hand Tools

Pneumatic pressure test method

Note: the below is provided as an example, its a very common method of testing but be aware that projects can be different

To complete the pneumatic pressure testing of the FM-200 pipework system, the following steps should be completed using Nitrogen Gas:

1Ensure all pre-requisites and pre-functional testing checks have been completed.
2Remove all discharge nozzles and replace with blanking caps.
3Connect the nitrogen bottle via the temporary hoses, valves, and pressure gauge, at the system lowest point, to the valve assembly/connection point.
4Introduce pressure into the system slowly until the pressure gauge reads 40 psi / 276 kPa / 2.7 bar.
5Once at the required pressure, and with the nitrogen still attached and isolating valve closed, wait 2 minutes for the system to settle.

If there is a drop-in pressure and no obvious leaks increase pressure via the nitrogen bottle until test pressure is reached.
6Isolate the nitrogen bottle via the temporary valve to ensure no additional pressure can be put into the system.
7Take air temperature readings in the spaces and document them on the pressure test certificate.
8Note the testing start time and date on the pressure testing certificate for the record, photographing the test gauges for evidence [if required].
9Walk the system checking for any leaks for the period of the test and checking the pressure gauge(s) for signs of any movement.
10The test should be aborted and investigations made with remedial action taken if the test pressure moves outside of the required tolerance.
11If no issues are noted then continue the test until the period of 10 minutes has been completed from the documented testing start time.
12Review the pressure gauges for the final time, to see if there is any drop in pressure and ensure inline with the allowed tolerances.
13Once the time has elapsed for the required test and it is deemed to be accepted by the relevant parties in attendance, the testing will be complete.
14Photographic evidence should be taken with all information entered the pressure test certificate.
15Release the pressure from the system safely and disconnect the pressure gauge etc.
16Move to the puff/flow testing stage.

Puff/flow testing method

The reason for conducting a ‘puff/flow’ test is to ensure that there is a continuous flow through the pipework and to ensure all valves are installed correctly and in the correct direction.

To conduct this test the following steps should be followed.

1Re-install all FM-200 discharge nozzles/heads
2At each discharge nozzle, tie a piece of ribbon, so that it can ‘flutter’ when the air is passing through the nozzle, providing a visual indication.
3Ensure a bottle of nitrogen/temporary hoses are connected at the cylinder connection to the system.
4Once ready open the valve on the nitrogen bottle to allow it slowly through the pipework system.
5As the nitrogen passes through the system the ribbon tied to the discharge heads should ‘flutter’, proving the flow is continuous and that all system valves are in the correct direction.
6Once the test is deemed to be accepted by the relevant parties in attendance, close off the valve stopping the nitrogen from flowing.
7Disconnect the temporary hoses and remove the ribbons from the discharge nozzles.
8Complete all documentation/certificates to prove the testing was successful and take photographic evidence [if required]

FM200 Pneumatic Pressure & Puff/Flow Testing Method Statement Download [PDF]

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