H.4.1.7 manhole cover shall be provided with a suitable vent
H.4.1.7 manhole cover shall be provided with a suitable vent
(OP)
Hi, everybody
I have a question about the API 650 H.4.1.7.
If we want to design the metallic pontoon floating roof, annular closed flotation compartment, due to H.4.1.7 the manhole cover shall have suitable vent.
What is suitable vent? is it free vent?
And I still confuse about "closed compartments shall be capable of being reseal in field after inspection(to prevent liquid or vapor entry)",
meanwhile the manhole cover with vent.
so, what is the purpose of the vent on the manhole cover?
I have a question about the API 650 H.4.1.7.
If we want to design the metallic pontoon floating roof, annular closed flotation compartment, due to H.4.1.7 the manhole cover shall have suitable vent.
What is suitable vent? is it free vent?
And I still confuse about "closed compartments shall be capable of being reseal in field after inspection(to prevent liquid or vapor entry)",
meanwhile the manhole cover with vent.
so, what is the purpose of the vent on the manhole cover?
RE: H.4.1.7 manhole cover shall be provided with a suitable vent
RE: H.4.1.7 manhole cover shall be provided with a suitable vent
"Reseal in the field" sounds like they just don't want you having to cut holes to access the interior. This may apply to the floats on skin-and-pontoon aluminum roofs more than anything.
RE: H.4.1.7 manhole cover shall be provided with a suitable vent
Finally, I read Annex C, EFR and it talks about the vent on pontoon.
I think both are in the similar concern between EFR and IFR. In Annex C, it says "vent" is to protect against internal or external pressure for compartment.
Also, the requirement of manhole neck height is to protect the condition of punctured pontoons and broken center deck so that it causes liquid flows in to compartment.
This is my point of view... share with you