RE: [PipingDesign] Piping connected to machinery equipment

From: <Steve>
Date: Fri Apr 27 2007 - 18:01:00 EDT

Hi Khaled

There is often a fair amount of corrosion around vents and drains. By having the branch in a spool repair, and testing can be done in the workshop, or a rotable spare can be held. Instrument connections often get a fair amount of use and repairs/alterations are not uncommon. So the same can apply. If repair/retest problems are not forseen, its probably not worth the extra cost.

Cheers

Steve

>From: lodilodi <kahabib@yahoo.com>
>Reply-To: PipingDesign@yahoogroups.com
>To: PipingDesign@yahoogroups.com
>Subject: [PipingDesign] Piping connected to machinery equipment
>Date: Fri, 27 Apr 2007 13:32:35 -0700 (PDT)
>
>Dear Friends
>
>API RECOMMENDED PRACTICE 686 in Chapter 6
>(Piping)states in Para. 2.10.2 "Piping vents and
>drains shall be located in breakout spools on the
>inlet and outlet piping to the machine".
>Furthermore,Pressure measurement connections required
>with isolation valves are to be installed in spool as
>shown in Fig B3. My question is why those vents,
>drains or pressure connections have to be in spool and
>not tapped directly in the pipe (by installing boss,
>nipple, isolation valve and then the pressure gauge)
>
>Thanks
>
>Khaled

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