Recent content by LJthien

@HVAC-Novice, Very professional and helpful. Thanks a lot.

Thanks HVAC-Novice, That is what I am talking about: Block off to split duct line into several portions. Can you advise some tools which can go inside and block off ducts?

We are going to do the final leak test of HVAC system after installing and connecting all portions together. I only know I can do it using a blower or a fan and measuring airflow and pressure differentials. Can someone advises me if there are tools for testing portions of the duct separately...

@0707 Really helpful and clear. I note it down. Thanks a lot.

Hi brothers, I need to repair some hot dip galvanized items and I understand that 95% Zinc paints are normally used. Just to consult you if I can apply an Acrylic resin paint to the galvanized steels since I have the paint available. Please advise if Acrylic resin paints stick to galvanized...

I am considering to apply laser cleaning method for touch-up painting of some special items which are long galvanized bars of 2mm thickness. I have never done it before and I worry that the heat of the laser beam may cause a deformation on the thin bar items. Can anyone advise me the temperature...

@geesaman.d (Mechanical) Thanks David.

@MintJulep, Thanks, I get your point. It should have been blasted to have the best service life.

Hello guys! I receive some metal products which are coated by electrostatic powder and I try to figure out if the service life of electrostatic powder coat is equal to conventional painting methods or not. My point is, items are coated by electrostatic powder are not blasted and therefore no...

@ crshears, Do you mean levels of authorization for operating electric equipment? I imply that and I think it could be. Thanks a lot.

Hi, We are reviewing documents of our new project, which say "Contact protection protocol for the plant is required". I am not sure what it exactly is as this is the first time I see the requirement for electrical work. Can someone help explain me what "Contact protection protocol for the plant"...

@ Pierreick, "what is important is that the supplier for this material is qualified by FDA". That is what I am not experienced and want to learn. Can you elaborate how a supplier is qualified by the FDA? Does it mean supplier is registered in the FDA 's web. Thanks.

@3DDave What do you mean contact the FDA? I thought FDA just approve safe materials only, not brand name of any products. Thanks.

Thank you Pierreick and EdStainless, I have inquired the supplier and what I will receive is a Certificate of Quality (2.1 type certificate) from the manufacturer for self declaration of FDA conformity, and the sealing material itself is PTFE type which is approved by FDA in 21CFR177.1550. But I...

Hi all, I am purchasing some gasket and sealing materials from a manufacturer based in Europe, which should be FDA compliance. My understanding is that if the sealing material is the type approved and listed by FDA then we can accept it without any addition FDA compliance certificate. Please...