DN-07c – Test & purge MP service (≤ 2”/ 63mm)

• Site conducted

• Conducted on

  Date

• Prepared by

• Location
  Address

• Operative being assessed

  Yes

  No

  N/A

• Testing MP service from the gas main to the open but capped inlet valve of the boundary
  service regulator or alternatively the ECV if the MP regulator is part of the meter installation

• Fits the test equipment onto the mains connection

  Yes

  No

  N/A

• Slowly introduces air using either a foot or hand pump

  Yes

  No

  N/A

• Carries out a test at 3 bar in accordance with current SGN procedure

  Yes

  No

  N/A

• Question - How long is the stabilisation period, how long must the test be applied for and how much pressure loss is permissible?

• Answer - No stabilisation period is required and be applied for 5 minutes with no pressure loss

• Tests all exposed joints using SGN approved leak detection fluid

  Yes

  No

  N/A

• Closes the inlet valve on the boundary service regulator or ECV on completion of a satisfactory test

  Yes

  No

  N/A

• Releases the test pressure from the opposite end from the test apparatus ensuring there is no danger <br>of injury to themselves and any member of the public

  Yes

  No

  N/A

• Question - Why is it necessary to release the pressure from the opposite end from the test apparatus?

  Yes

  No

  N/A

• Answer - To ensure the whole length of the service has been tested and free from blockage
  

• Records the test result immediately in the test record book, Tablet or service job card

  Yes

  No

  N/A

Purge and commission MP service

• Attaches a flexible purge hose with a flame trap to the inlet valve of the boundary service regulator or <br>ECV and ensures the flame trap is away from any openings into the premise and away from any <br>potential sources of ignition

  Yes

  No

  N/A

• Ensures there is a means of communication between both operatives during the purge process

  Yes

  No

  N/A

• <br>Ensures the inlet valve of the boundary service regulator or ECV is fully open

  Yes

  No

  N/A

• Commissions the service by either:-<br>1. PE connection – drills the main with the integral cutter and withdraws it into the top of the <br>tapping tee<br>2. Metallic connection – withdraws the integral plug into the top of the service tee

  Yes

  No

  N/A

• Purges the service to atmosphere as per current SGN procedures

  Yes

  No

  N/A

• Question - At what point can the purge be stopped?

• Answer - Two successful tests confirming 90% gas in air at the outlet of the purge hose using a Gascoseeker or by purging
  with natural gas at a rate of one second per metre for a service pipe <32mm or four seconds per metre for up
  to 63mm diameter

• Closes the inlet valve of the service boundary regulator or ECV once the purge is complete allowing the <br>service to pressurise

  Yes

  No

  N/A

• Checks the operation of the service excess flow valve (SEFV) by quickly opening the inlet valve of the <br>boundary service regulator or ECV allowing to vent through the purge hose

  Yes

  No

  N/A

• Question - How will it be confirmed that the SEFV is operating correctly and what action should be taken if it fails?

• Answer - The gas flow will decrease. The SEFV must be replaced and a further pressure test must be undertaken on the
  service

• Closes the inlet valve or ECV to allow the SEFV to reset automatically

  Yes

  No

  N/A

• Closes the ECV and fits cap to the ECV and checks with SGN approved leak detection fluid. Or, caps off <br>the inlet valve of the boundary service governor and checks with SGN approved leak detection fluid

  Yes

  No

  N/A

• Completes the service information label and attaches to the ECV, if required

  Yes

  No

  N/A

Sign off

• Name of assessor

  Yes

  No

  N/A

• Pass or refer for additional training

  Pass

  Fail

  N/A