Gas > Tightness Testing And Puging Section E > Flashcards

Tightness Testing And Puging Section E Flashcards

(66 cards)

Study These Flashcards
1
Q

What does IGEM/UP/1B provide guidance on?

A

Tightness Testing and Purging

This document outlines procedures and standards for testing gas installations.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is the significance of ‘No Perceptible Movement’ in tightness testing?

A

Indicates that there should be no detectable movement in the system during testing

This is a key criterion for determining the integrity of gas installations.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Define Permissible Pressure Drop in the context of tightness testing.

A

The maximum allowable decrease in pressure during a test

This ensures that the installation is safe and leak-free.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What are the two flowcharts mentioned for tightness testing procedures?

A
  • Flowchart 1 - Tightness Testing Procedure for New and Existing Installations
  • Flowchart 2 - Testing Medium Pressure Installations with No Test Valve Fitted

These flowcharts guide the testing process for different installation scenarios.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is the maximum permissible pressure drop in mbar for existing installations with appliances connected?

A

Specific value defined in the guidelines

This value is critical for ensuring safety in gas installations.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is involved in the purging process?

A
  • Calculation of Purge Volume
  • Specific Pipe Volumes
  • Purging Procedure
  • Purge Volume of Larger Systems

Purging is essential for removing air or other gases from the system before gas is introduced.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What does IVm stand for in the context of meter installation?

A

Meter Installation Volumes

This is important for calculating the volume of gas that can be safely handled by the installation.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What are the examples provided for calculations in the document?

A
  • Examples of IV and PV Calculations

These examples help in understanding how to perform necessary calculations for gas installations.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is the purpose of the flowchart for selecting appropriate standards when testing natural gas installations?

A

To guide users in choosing the correct testing standards

This ensures compliance with safety regulations.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Tightness Testing & Purging

A

The GSIUR’s say that when a gas pipe is installed, or where work has been carried out that could affect its integrity, the pipe should immediately be tested for tightness, at least as far as the nearest upstream and downstream valves.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Testing for tightness

A

Simply testing the pipe with leak detector fluid does not constitute ‘testing for tightness’, since leak detector fluid on joints will not show up a pinhole in a pipe somewhere between joints.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Tightness test

A

A tightness test is a ‘pressure decay test’ which involves taking the pipework up to a set pressure and testing for any loss of pressure over a specified period.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

New pipework pressure drop

A

For new pipework there should be no perceptible pressure drop over the specified time.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Existing installations pressure drop

A

For existing installations with appliances connected, the standard allows a maximum pressure drop over the specified period provided there is no smell of gas.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

AECV

A

Additional Emergency Control Valve a valve typically sited downstream of the meter where the meter is remotely sited.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

ECV

A

Emergency Control Valve (may be the MIV or a separate valve for example where the MIV is at a secondary meter the ECV will be sited at the primary meter).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

ESP

A

Emergency Services provider.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

GT

A

Gas Transporter.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

IVm

A

Installation Volume (volume of pipework and meter) may also mean Isolation Valve (usually at the appliance).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

LDF

A

Leak Detection Fluid.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

MAM

A

Meter Asset Manager.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

MIP

A

Maximum Incidental Pressure (max pressure under fault).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

MIV

A

Meter Inlet Valve (the inlet valve of any meter if primary meter may also be the ECV).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

MOP

A

Maximum Operating Pressure (the outlet pressure of the meter).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
МОРи
Maximum Operating Pressure Upstream.
22
OP
Operating Pressure (e.g. burner pressure).
23
PVf
Purge Volume of Fittings.
24
PVm
Purge Volume of Meter.
25
PVp
Purge Volume of Pipe.
26
PVt
Total Purge Volume.
27
SSOV
Safety Shut-off valve (e.g. cooker lid).
28
Scope and Guidance
The standard covering domestic tightness testing and purging is IGEMUP/B. OR IGEMLiP/i.
29
Requirements for IGEM/UP/1B
Operating pressure is normally equal to 21mbar, Pipe diameter of installation pipework up to but not exceeding 35mm, Meter designation of U16/G10 or less, A maximum supply operating pressure (MOPU) of 2bar, An installation volume not exceeding 0.035m°.
30
Tightness testing procedure
The tightness testing procedure detailed in IGEM/UP/1B should be used for: New installations, Alterations to, or re-use of existing installations, New extensions to existing pipework, Prior to any work on existing installations, Where there is a known or suspected gas escape, Where there has been a complete loss of pressure upstream of the ECV or of installation pressure, Routine testing of existing installations, Immediately before purging.
31
Purge procedure
The purge procedure detailed in IGEM/UP/1B should be used for: New installations, Alterations to, or re-use of existing installations, New extensions to existing pipework, Where there has been a complete loss of pressure upstream of the ECV or of installation pressure, Where there is a possibility of air being present in the installation.
32
No Perceptible Movement
No perceptible movement on a pressure gauge means the human eye cannot detect any movement. This is defined as less than 0.25 mbar on a water gauge and less than 0.2 mbar on a 1 decimal place electronic gauge.
33
Permissible Pressure Drop
The size of any pressure drop over the test period gives an indication to the size of any leak or leaks on the installation.
34
Testing after installation work
When extending or altering an installation it must be tested before and after any work has been carried out.
35
Maximum pressure drop
The size of the permissible pressure drop depends on the volume of the installation.
36
37
Tightness Testing & purging
water level rising • possible let by
38
TIGHTNESS TESTING PROCEDURE FOR NEW AND EXISTING INSTALLATIONS
WATER level Drop
39
Open appliance isolation valves and as applicable close
• Possible Galleak control taps, extinguish pilot lights, isolate call for heat and open SSOV. Raise any fold down cooker lid.
40
isolate all appliances
And Test AGAIN
41
Connect pressure gauge.
• IF STIll DrOPS = Pipework
42
Carry out let-by test of the ECV, AECV or MIV as applicable to the installation
by slowly raising the pressure to between 7 and 10mb and then closing the valve. Test for 1 minute with no perceptible rise. (See note to Box A)
43
IF NO DrOP =
Appliance - Locate with LDF or Gas sniffer Rise in gauge pressure.
44
Check the barrel of the valve under test with LDF.
If let-by is confirmed contact the gas supplier.
45
Raise the pressure to between 20 and 21mb
and allow 1 minute for temperature stabilisation.
46
Adjust the pressure back to between 20 and 21mb if necessary
and test for 2 minutes.
47
BOX A
For Tightness testing installations with a MOPy exceeding 75mbar where a test valve is not fitted refer to FLOWCHART 2.
48
The installation has passed the test.
NO - Gauge shows perceptible movement.
49
YES → New installation.
YES Use Table E1 Permissible Pressure Loss and if the pressure drop is > NO → within allowances and there is no smell of gas the installation is deemed to have passed.
50
Remove gauge, reseal the test point, turn on the gas and LDF the test point.
The installation has failed the test. Trace, repair and retest or cap supply.
51
New appliances
Remove gauge, reseal the test point, turn on the gas and LDF the test point.
52
The installation has failed the test.
Trace, repair and retest or cap supply.
53
Medium pressure installations
Where a medium pressure installation has a Meter Inlet Valve (MIV sometimes known as a Test Valve (TV) fitted the tightness test procedure shown in Flowchart 1 should be applied.
54
Where a test valve is not fitted
the Gas Transporter or ESP should be informed, but the engineer may still need to complete a tightness test.
55
Where this is the case
the procedure in Flowchart 2 should be followed., Air test in accordance with up/IB
56
TESTING MEDIUM PRESSURE INSTALLATIONS WITH NO TEST VALVE FITTED
Appendix 4
57
Open appliance isolation valves
and as applicable close control taps, extinguish pilot lights, isolate call for heat and open SSOV.
58
Turn off gas supply at ECV allowing pressure in system to release fully,
connect pressure gauge.
59
Carry out a let-by test of the ECV.
In order to do this raise the pressure to between 7 and 10mb and hold the release mechanism open for 1 minute (or operate mechanism at beginning and end of let-by test).
60
Rise in gauge pressure.
YES → Report to the ESP or gas transporter, do not attempt to expose the barrel of the valve.
61
Release any pressure and adjust the gauge to between 18 and 19mb
turn off the supply.
62
Continue from BOX A
FLOWCHART 1.
Gas
flashcards
Decks in class (1)
# Cards
Brainscape helps you reach your goals faster, through stronger study habits.
© 2026 Bold Learning Solutions. Terms and Conditions