slide1 n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
WHAT IS MASTITE NON-ASBESTOS ? PowerPoint Presentation
Download Presentation
WHAT IS MASTITE NON-ASBESTOS ?

Loading in 2 Seconds...

play fullscreen
1 / 30

WHAT IS MASTITE NON-ASBESTOS ? - PowerPoint PPT Presentation


  • 209 Views
  • Uploaded on

WHAT IS MASTITE NON-ASBESTOS ?. MASTITE NON-ASBESTOS ARE MATERIALS THAT HAVE BEEN SPECIALLY DEVELOPED TO COMBAT THE DANGERS OF ASBESTOSIS. WHAT IS MASTITE NON-ASBESTOS ?. PLEASE LET ME INTRODUCE MYSELF MY NAME IS MR. MASTITE I WILL BE TALKING TO YOU ABOUT: HEALTH & SAFETY

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

WHAT IS MASTITE NON-ASBESTOS ?


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
slide2

WHAT IS

MASTITE

NON-ASBESTOS ?

slide3

MASTITE NON-ASBESTOS

ARE MATERIALS

THAT HAVE BEEN

SPECIALLY DEVELOPED

TO COMBAT THE

DANGERS OF

ASBESTOSIS

WHAT IS

MASTITE

NON-ASBESTOS ?

slide4

PLEASE LET ME INTRODUCE MYSELF

MY NAME IS

MR. MASTITE

I WILL BE TALKING TO

YOU ABOUT:

HEALTH & SAFETY

ASBESTOS ‘V’ NON-ASBESTOS

MATERIAL PROPERTIES

slide5

DID YOU

KNOW

FOR MORE THAN 20 YEARS

IT HAS BEEN KNOWN

ASBESTOS CAN SERIOUSLY

DAMAGE YOUR HEALTH

slide6

DID YOU

KNOW

IT IS ESTIMATED

3,500 PEOPLE

DIE EACH YEAR

FROM ASBESTOSIS

slide7

ALSO

BY THE YEAR 2000

ALL ASBESTOS

WILL BE PROHIBITED

IN EUROPE & AMERICA

slide10

WHAT ARE THE

DIFFERENCES

BETWEEN ASBESTOS

AND NON-ASBESTOS

slide11

WHAT ARE THE

DIFFERENCES

BETWEEN ASBESTOS

AND NON-ASBESTOS

GOOD

QUESTION

slide12

ASBESTOSNON- ASBESTOS

TEMPERATURE:approx.500 apprx.300

FIBRE CONTENT up to 70% up to 40%

COMPRESSION approx.10% approx. 15%

SAFETY DANGEROUSsafer alternative

COST appox. X 2

slide13

Non-Asbestos

There is no one fibre that can replace

the asbestos fibre at present. Most

manufacturers use a combination of:

Aramid, Glass, Mineral and Carbon.

It is also know that there are many

more compositions used when

producing Non-asbestos sheeting than

when producing asbestos.

slide14

WHAT PROPERTIES

MAKE

A

GOOD SEAL ?

slide15

TYPICAL FLANGE JOINT

Sealing Properties required :

Good compression

Low creep

Temperature resistance

Chemical resistance

Low permeability

Recovery

slide16

K.M.G. 한국매스타이트㈜

FLANGE JOINT SECTION

External Pressure (Bolt Torque )

IDEAL GASKET:

High Compressibility with a

low creep factor

giving good resistance

to temperature

& chemicals/gases.

It is always better to have the thinnest gasket possible

however consideration of

flange smoothness

& distortion should be made when calculating

the Gasket thickness.

Internal Pressure.

Resistance to Fluid

or Gas being handled.

Resilience to

Flange Movement

slide17

POSSIBLE LEAK PATHS

Permeability through

the Material

Irregularities of the

Flange surface & flange

distortion.

Giving rise to

possible leakage

slide18

GUIDE TO CALCULATING GASKET THICKNESS

X Times 2 x 100

y

Gasket

Thickness

Measure surface finish

& flange distortion.

Take the greater of

the two = x

ASBESTOS

Typical compression

value of Asbestos

9%=y

NON-ASBESTOS

Typical compression

value of Non-Asbestos

13%=y

Eg.

Asbestos

0.135 x 2 x100

y(9)

3mm

Eg.

Non-Asbestos

0.135 x 2 x100

y(13)

2mm

slide19

GASKET CREEP

External Pressure

(Bolt Torque )

Gasket creep occurs when

external stress(pressure)

and temperature is applied

to the gasket.

The effect of gasket creep

is a thickness decrease in

the gasket material coupled

with the gasket spreading

into the inner flange & the

outer.

In extreme cases gasket

creep can result in a complete

breakdown of the material.

External Pressure

(Bolt Torque )

slide20

GASKET CREEP

External Pressure

(Bolt Torque )

Gasket creep occurs when

external stress(pressure)

and temperature is applied

to the gasket.

The effect of gasket creep

is a thickness decrease in

the gasket material coupled

with the gasket spreading

into the inner flange & the

outer.

In extreme cases gasket

creep can result in a complete

breakdown of the material.

External Pressure

& temperature

cause gasket

thickness decrease

& creep

External Pressure

(Bolt Torque )

slide21

GASKET CREEP

External Pressure

(Bolt Torque )

Gasket creep occurs when

external stress(pressure)

and temperature is applied

to the gasket.

The effect of gasket creep

is a thickness decrease in

the gasket material coupled

with the gasket spreading

into the inner flange & the

outer.

In extreme cases gasket

creep can result in a complete

breakdown of the material.

This then reduces

the external

downward pressure

creating potential

leak paths

External Pressure

(Bolt Torque )

slide22

GASKET CREEP

Generally the higher the

compressibility of a material

the better the initial sealing

properties.

However high compressibility

can sometimes give high levels

of GASKET CREEP which will

cause the gasket to leak or

in some cases fail completely.

So far we can conclude that

material with good

compressibility and low creep

is desirable.

GOOD COMPRESSIBILITY

& LOW CREEP

= GOOD SEALABILITY

slide23

GASKET RECOVERY

External Pressure

Gasket Recovery is very

important when the material

is under cyclic loading.

For example when a flange

is heated expansion occurs

causing increased pressure

on the gasket resulting in the

gasket reducing in thickness.

When the loading (pressure)

is reduced the gasket should

recover its thickness

sufficiently enough as to not

impair its sealing abilities.

External Pressure

slide24

GASKET RECOVERY

Increased

External Pressure

Gasket Recovery is very

important when the material

is under cyclic loading.

For example when a flange

is heated expansion occurs

causing increased pressure

on the gasket resulting in the

gasket reducing in thickness.

When the loading (pressure)

is reduced the gasket should

recover its thickness

sufficiently enough as to not

impair its sealing abilities.

The flange expands

causing increased

pressure on the

gasket

Increased

External Pressure

slide25

GASKET RECOVERY

External Pressure

Gasket Recovery is very

important when the material

is under cyclic loading.

For example when a flange

is heated expansion occurs

causing increased pressure

on the gasket resulting in the

gasket reducing in thickness.

When the loading (pressure)

is reduced the gasket should

recover its thickness

sufficiently enough as to not

impair its sealing abilities.

Gasket

recovery

External Pressure

slide26

HOT CREEP TEST

STANDARD: DIN 28090-1 (Modified)

MATERIAL : MASTITE NASB 9 2.0mm NON-ASBESTOS

TEST : 5 HOUR HOT CREEP @ 50MPa 300 C

RESULT : 8.5% CREEP 22% COLD COMPRESSION

TEMPERATURE °C

THICKNESS DECREASE mm

30 60 90 120 150 180 210 240 270 300

TOTAL TIME 5 HOURS ( SEGMENTS 30 MINUTES )

slide27

HOT CREEP TEST

STANDARD: DIN 28090-1 (Modified)

MATERIAL : MASTITE NASB 9 2.0mm NON-ASBESTOS

TEST : 5 HOUR HOT CREEP @ 50MPa 300 C

RESULT : 8.5% CREEP 22% COLD COMPRESSION

TEMPERATURE °C

THICKNESS DECREASE mm

30 60 90 120 150 180 210 240 270 300

TOTAL TIME 5 HOURS ( SEGMENTS 30 MINUTES )

slide28

STANDARD: DIN 28090-1 (Modified)

COLD COMPRESSION

MATERIAL : MASTITE NASB 9 2.0mm NON-ASBESTOS

TEST : 30 MINUTES COLD COMPRESSION @ 50MP

RESULT : 8.5% CREEP 22% COLD COMPRESSION

TEMPERATURE °C

THICKNESS DECREASE mm

Decrease in

Material

Thickness

equals 0.44mm

equals 22%

30 mins

slide29

CHECKLIST

Remember !!

Reduce thickness

when using

non - asbestos

1) What temperature is required ?

2) What internal/external pressure ?

3) Flange irregularities ? Decide on

compressibility & thickness of material

4) Does the material have a low creep value ?

5) Is the material resistant to the medium being

sealed?

6) Will the gasket be under cyclic loading ?

Check stress relaxation & recovery

slide30

FINALLY

Mr

Mastite