For more than 50 years penetrant inspection has been a
major nondestructive testing method and chlorinated
solvents have been widely used in the technique. Industrial
applications of MCF as a favourable chlorinated
solvent have proven to be a significant concern to our
environment and will be eliminated over the next seven
years under the Montreal Protocol.
In order to qualify suitable materials for the replacement
of MCF a systematic approach was developed by identifying
the requirements for the MCF. One of the main
requirements for the replacement material is rise capability
in the discontinuities especially for liquid penetrant
applications. Today an important alternative
substance is HCFC-123, but from the discussion of
Table 2, the capillary rise factor for the HCFC- 123 is less
than the half value of the MCFs. It may be thought that
this characteristic will cause an undesirable situation.
However, if the Figure 5 is evaluated, it can be said that
HCFC-123 may be suitable in applications of liquid
penetrant testing for cracks. However, HCFC- 123 would
have shortcomings for shallow discontinuities, according
to the capillarity effect.
HCFC-123 has a low boiling point, and so evaporates
rapidly. This causes some difficulties in using a spray
form, because after being emitted from a spray can, it can
vapourize before contact with the surface. Its low boiling
point is also an undesirable property as a developer
substance because it does not leave enough time for
capillarity effect on the surface of the part. So, HCFC-
123 is not especially appropriate as a non-aqueous
developer carrier. Moreover, according to MCF, HCFC-
123 has a high toxicity rate. Lastly, it can be said that
HCFC-123 is an alternative substance for MCF, but with
some reservations.
For more than 50 years penetrant inspection has been a
major nondestructive testing method and chlorinated
solvents have been widely used in the technique. Industrial
applications of MCF as a favourable chlorinated
solvent have proven to be a significant concern to our
environment and will be eliminated over the next seven
years under the Montreal Protocol.
In order to qualify suitable materials for the replacement
of MCF a systematic approach was developed by identifying
the requirements for the MCF. One of the main
requirements for the replacement material is rise capability
in the discontinuities especially for liquid penetrant
applications. Today an important alternative
substance is HCFC-123, but from the discussion of
Table 2, the capillary rise factor for the HCFC- 123 is less
than the half value of the MCFs. It may be thought that
this characteristic will cause an undesirable situation.
However, if the Figure 5 is evaluated, it can be said that
HCFC-123 may be suitable in applications of liquid
penetrant testing for cracks. However, HCFC- 123 would
have shortcomings for shallow discontinuities, according
to the capillarity effect.
HCFC-123 has a low boiling point, and so evaporates
rapidly. This causes some difficulties in using a spray
form, because after being emitted from a spray can, it can
vapourize before contact with the surface. Its low boiling
point is also an undesirable property as a developer
substance because it does not leave enough time for
capillarity effect on the surface of the part. So, HCFC-
123 is not especially appropriate as a non-aqueous
developer carrier. Moreover, according to MCF, HCFC-
123 has a high toxicity rate. Lastly, it can be said that
HCFC-123 is an alternative substance for MCF, but with
some reservations.
การแปล กรุณารอสักครู่..

For more than 50 years penetrant inspection has been a
major nondestructive testing method and chlorinated
solvents have been widely used in the technique. Industrial
applications of MCF as a favourable chlorinated
solvent have proven to be a significant concern to our
environment and will be eliminated over the next seven
years under the Montreal Protocol.
เพื่อที่จะรับวัสดุที่เหมาะสมสำหรับการทดแทน
ของ MCF วิธีที่เป็นระบบที่ถูกพัฒนาขึ้นโดยการระบุข้อกำหนดสำหรับ MCF
. หนึ่งในความต้องการหลักสำหรับวัสดุทดแทน
เพิ่มขึ้นความสามารถในความไม่ต่อเนื่อง โดยเฉพาะของเหลวแทรกซึม
โปรแกรม วันนี้มีสาระสำคัญคือ hcfc-123 ทางเลือก
แต่จากการสนทนาของโต๊ะ 2 the capillary rise factor for the HCFC- 123 is less
than the half value of the MCFs. It may be thought that
this characteristic will cause an undesirable situation.
However, if the Figure 5 is evaluated, it can be said that
HCFC-123 may be suitable in applications of liquid
penetrant testing for cracks. However, HCFC- 123 would
have shortcomings for shallow discontinuities, according
to the capillarity effect.
HCFC-123 has a low boiling point, and so evaporates
rapidly. This causes some difficulties in using a spray
form, because after being emitted from a spray can, it can
vapourize before contact with the surface. Its low boiling
point is also an undesirable property as a developer
substance because it does not leave enough time for
capillarity effect on the surface of the part. So, HCFC-
123 is not especially appropriate as a non-aqueous
developer carrier. Moreover, according to MCF, HCFC-
123 has a high toxicity rate. Lastly, it can be said that
HCFC-123 is an alternative substance for MCF, but with
some reservations.
การแปล กรุณารอสักครู่..
