valve clean for isocynate services

[kali_0142]

HI friends and respectable sirs.
i am kalidass mechanical engineering and i am working in valve companies.
today i got mail from my customer.that was cleaning the valve for isocynate services.
please help me to how will clean the valves.
and which solvent and lubricant is good.and also steps please.
thank you.

 

[Danlap]

Hi kalidass,

there are several ways to do that, and for sure it will not be free:
One thing for sure, clean is something that is needed to be defined and measured or verified by certified company. Passivation might be done internally, but even this should be assessed by certified QA/QC personnel.
a. Ask your local and certified cleaning company. This company normally do degreasing, passivation, etc. on regular basis. And most importantly they have calibrated measurement level of any (measurable) components that required to be measured e.g. pH meter, VOC meter (in air), humidity, etc. The simplest method to verify clean is by wiping method, but even this have to be done under certain condition e.g. what parts need to be wiped, using black-light, etc.
b. Do your own due diligence, what do isocynate reacts with and at what level? Water, etc. and then find applicable standard
Since you are asking this question, I assume your company don't have specific cleaning procedure, dedicated cleaning room and clean packaging standard as minimum. Having said that, to comply with the "procedure" you have to fulfill all the cleaning equipment criteria and have it certified. Is it worth for one time project to invest such??

Also, what is the material? For example, de-greasing carbon steel in comparison with stainless or alloy material will have different end result and valve performance.
Some example for cleaning method and quality control:
G93 − 03 Cleaning Methods and Cleanliness Levels for Material and Equipment Used in Oxygen-Enriched Environment
A380 Practice for Cleaning, Descaling, and Passivation of Stainless Steel Parts, Equipment, and Systems
D6345-10 Standard Guide for Selection of Methods for Active, Integrative Sampling of VOC in Air,
etc.

Suggest to sub-contract this as per point a.
PS: most of us spend valuable hours to write procedure refer to equipment or facilities that what we (as individual/employee) have or about to invest. Don't expect free lunch, plus it is really not advisable to copy paste procedure without in depth knowledge.

Kind regards,
MR

https://nosuchvalve.com

All valves will last for years, except the ones that were poorly manufactured; are still wrongly operated and or were wrongly selected

http://www.eng-tips.com/faqs.cfm?&rat1=2&fid=376

 

[kali_0142]

thank you so much sir. DANLAP