flush type cleanout fitting(door) not allowed in API 620 ?

[inammanj123]

Hello,

In API 620 there is no reference of flush type Clean out door like in API 650, only reference is flush type clean out nozzles, with a limitation on internal design pressure: it says "5.27.1.2 The design pressure for the gas vapor space of the tank shall not exceed 2 lbf/in.2 gauge."

Does this mean we cannot use flush type clean-out door in API 620 tank?

 

[HTURKAK]

I have API 620 11. th ED.




5.27 Flush-type Shell Connection


You can use flush type clean-out door in API 620 tank provided that the conditions described 5.27.1.2 through 5.27.1.4. satisfied.

 

[inammanj123]

HTURKAK,

SECTION 5.27 Pertains only to flush type connections, doors are not addressed here. At the same time see API 650,there it clearly distinguishes "Fitting" from "connection". and has separate section for fittings (door) and nozzles

In API 650 there is a table for sizing of Flush type door, but in api 620 there is no such table.

They have only written the word of "flush type clean-out door" but no detail are given.

I think there is an ambiguity.

What do you guys think??

Thanks

 

[HTURKAK]

I have copied and pasted the relevant section ;

API 620 11th ED. 5.27.2 Dimensions and Details ,
5.27.2.1 The dimensions and details of the connection shall conform to Table 5-10, Figure 5-12, and the rules
specified in this section.
5.27.2.2 The maximum width, b, of the flush-type connection opening in the cylindrical sidewall shall not exceed
36 in.
5.27.2.3 The maximum height, h, of the opening in the cylindrical sidewall shall not exceed 12 in.
5.27.2.4 The thickness of the sidewall plate in the clean-out opening assembly shall be at least as thick as the
adjacent sidewall plate in the lowest sidewall course......

and this snap from Figure 5-12—Part 1—Flush-type Sidewall Connection,

 

[inammanj123]

MY friend door and connections are different. Door is like a rat hole all the way to flange. connection has rat hole shape but at the end converge to standard nozzle size, with flange