Instruction Manual

HAS60E-IM-HW

June 2007

4-8 LEAKAGE TEST

The gas path system should be leak tested at least twice a year and after maintenance, replacement or repair of gas path parts.

a)Required Tools

•Test Medium

•external Manometer

•Swagelok® Blind Unions (2)

N2

External Manometer:

15 psig = 1,000 hPa

or

 

He

 

sourceGas with testmedium

Closed Gas Connections

P

 

NGA 2000 CLD

b)Procedure

To perform aleakage testing, proceed as follows (see figure 4-4):

1.Close sample and ozonator air supply

2.Disconnect the gas connections

3.Close sample inlet and ozonator inlet with blind unions

4.Connect a pressure meter to the exhaust fitting

5.Connect test medium supply (N2 or He) to the pres- sure meter

6.Supply Analyzer Module with the test medium with a pressure of approx. 2,000 hPa (15 psig) and close

supply.

Since CLD internal it comes to equalization of pres- sure, supply is to open and to close repeatedly until manometer doesn’t show pressure changes.

7.Watch the manometer.

Over a period of about 15 minutes the pressure drop may not be higher than 7.5 hPa/min. using Helium (He) or 2.5 hPa/min. using Nitrogen (N2)

If the specifications (see table 4-1) were adhered to, then the test is finished.

Ozonator Air

Sample

CLD Analyzer Module

Exhaust

Figure 4-4: Principle Leakage Test Assembly

Test Medium

 

Nitrogen (N2)

Helium (He)

Test Pressure

 

15 psig / 2,000 hPa / 1 bar

15 psig / 2,000 hPa / 1 bar

Test Time

 

15 min

15 min

permissible

 

2.5 hPa / min

7.5 hPa / min

Drop in Pressure

 

 

 

 

 

Table 4-1: Leakage Test Specifications

Emerson Process Management GmbH & Co.OHG

Maintenance and Service 4 - 7