Operating Temperature


                                                              Permissible Operating Conditions


Typical External Heat Transfer Co-efficient.

 

LocationInstallationaa (W/m²K)  
Door Insulated2.3  
Protected by screens5.8  
Exposed to draught 11.6 
Outdoor Insulated2.3  
Protected by screens 11.6  
Exposed to draught58.0  

  

 

                                            
Buttress Ends

The glass process plant and pipeline components detailed in this catalogue have either standard flat buttress ends (Type A + B from DN 25  to  DN  450)

The following table provides dimensional information on standard flat buttress ends form for the range of glass components detailed in this catalogue.

Nominal Bore

DN

mm

25

40

50

80

100

150

225

300

450

Diameter

D1

mm

26.5

38.5

50

76

104

154

229

308

462

Diameter

D2

mm

42

57

69

99

132.5

185

258

340

535

         Type

A        +        B

 
 
Ti10.jpg (2035 bytes)

Maximum Working Pressures

Depending on shape and working conditions, glass components can be used, under certain circumstances, at higher internal pressures.

Although bar is a measure of absolute pressure, throughout these pages the figures given for maximum recommended working pressure represent pressures above atmospheric; i.e., "gauge" pressure.

Please Note:

Because of the potential energy of gases under pressure, we recommend you specify and provide safeguards for equipment and personnel in the unlikely event of a systems failure. For the same reason, pressurized as should not be used to test a system.

All sizes are safe for use under full vacuum.

DN

Bar

PSI

 

 

 

25

7.0

100

40

4.5

65

50

4.0

58

80

3.0

43.5

100

2.5

36.2

150

2.0

29

225

1.0

14.5

300

0.7

10.2

450

0.5

7.3

 

  

 

Working Temperatures

Borosilicate glass retains its mechanical strength and will deform only at temperatures which approach its strain point. The practical upper limit for operating temperatures Is much lower and is controlled by the temperature differentials in the glass, which depend on the relative temperatures of the contents of the equipment and the external surroundings.

provided borosilicate glass is not subjected to rapid change in temperature, creating undue thermal shock, it can be operated safely at temperatures up to 4500F (2320C). The normal limiting factor is actually the gasket material. The degree of thermal shock (usually defined as sudden chilling) which it can withstand depends on many factors, for example: stresses due to operating conditions; stresses imposed in supporting the equipment; the wall thickness of the glass, etc. It is therefore undesirable to give an overall figure but, as a general guide, sudden temperature changes of up to about 2160F (1200C) can be accommodated

At sub-zero temperatures, the tensile strength of borosilicate glass tends to increase and equipment can be used with safety at cryogenic temperatures It is always advisable to discuss any difficult applications with our engineers.

  

   

Jacketed Components

Jacketed components are designed to complement the standard range of glass process plant and pipeline equipment's detailed in this catalogue by extending the range of applications for which glass can be used. Jacketed components, as their name implies, are standard glass components with a glass jacket around them. The jacket is sealed onto the glass component with silicone rubber.

Jacketed components are not only used to avoid heat loss for the purpose of saving energy, but also where the product characteristics have to be maintained to prevent crystallizing or unwanted reactions from occurring. A further area of application is thermal insulation where the ability to still monitor the process visually is a major advantage.

Jacketed versions of all the major glass components detailed in this catalogue are available. The range therefore includes pipeline components, valves and vessels as well as a wide variety of column components and heat exchangers.

Permissible Operating Conditions

For the inner part of jacketed components, the permissible operating pressure are identical to those for their non-jacketed counterparts. These pressures are detailed in the previous pages of this section.

However, deviations will arise in the permissible operating temperature for the inner component and the permissible operating conditions in the jacket itself. These are due to permanently flexible silicone seal, which absorbs the different expansion levels of the inner component and jacket.

Permissible Operating Temperature  

The permissible operating temperature for the inner component is -40°C to +_150°C. For  the jacket it is -40°C to +130°C.

In special circumstances, the operating temperature can be increased to +170°C for the inner component and +150°C in the jacket.

Permissible Operating Pressure

The  permissible  operating  pressure in the jacket is –0.2bar.g to + 0.1bar.g, unless lower values are derived from Figure 3 to 8 on the previous pages.

Please Note:

If there is a vacuum in the jacket, care must be taken to ensure that the pressure difference between the inner component and the jacket does not exceed the permissible operating pressure for given Figure 3 to 8 on the previous pages.