JAYDEE23
Materials
- Jun 16, 2009
- 146
Please see code text below.
I have a flow meter welded in line.
It is SA335 P91
24" NPS Sch60 Header (.969" thick)
1/2" NPT Branch Connection used for pressure sensing
750 psig
1085 F
per 114.2.1
this connection is not allowed
unless excluded by 114.2.3
My question is, what exactly is "insertion type
instrument, control, and sampling devices" ?
Does a pressure gage fall under this category?
________________________________________________________
114.2.1
(A) Threaded joints are prohibited where any of the
following conditions is expected to occur:
(A.1) temperatures above 496°C (925°F), except as
permitted by paras. 114.2.2 and 114.2.3
(A.2) severe erosion
(A.3) crevice corrosion
(A.4) shock
(A.5) vibration
(B) The maximum size limitations in Table 114.2.1
apply to threaded joints in the following services:
(B.1) steam and water at temperatures above 105°C
(220°F)
(B.2) flammable gases, toxic gases or liquids, and
nonflammable nontoxic gases [also subject to the exceptions
identified in paras. 122.8(B) and 122.8.2(C.2)]
114.2.2 Threaded access holes with plugs, which
serve as openings for radiographic inspection of welds,
are not subject to the limitations of para. 114.2.1 and
Table 114.2.1, provided their design and installation
meets the requirement of para. 114.1. A representative
type of access hole and plug is shown in PFI ES-16.
114.2.3 Threaded connections for insertion type
instrument, control, and sampling devices are not subject
to the temperature limitation stated in para. 114.2.1 nor
the pressure limitations stated in Table 114.2.1 provided
that design and installation meet the requirements of
paras. 104.3.1 and 114.1. At temperatures greater than
925°F (495°C) or at pressures greater than 1,500 psi
(10 350 kPa), these threaded connections shall be seal
welded in accordance with para. 127.4.5. The design and
installation of insertion type instrument, control, and
sampling devices shall be adequate to withstand the
effects of the fluid characteristics, fluid flow, and
vibration.
I have a flow meter welded in line.
It is SA335 P91
24" NPS Sch60 Header (.969" thick)
1/2" NPT Branch Connection used for pressure sensing
750 psig
1085 F
per 114.2.1
this connection is not allowed
unless excluded by 114.2.3
My question is, what exactly is "insertion type
instrument, control, and sampling devices" ?
Does a pressure gage fall under this category?
________________________________________________________
114.2.1
(A) Threaded joints are prohibited where any of the
following conditions is expected to occur:
(A.1) temperatures above 496°C (925°F), except as
permitted by paras. 114.2.2 and 114.2.3
(A.2) severe erosion
(A.3) crevice corrosion
(A.4) shock
(A.5) vibration
(B) The maximum size limitations in Table 114.2.1
apply to threaded joints in the following services:
(B.1) steam and water at temperatures above 105°C
(220°F)
(B.2) flammable gases, toxic gases or liquids, and
nonflammable nontoxic gases [also subject to the exceptions
identified in paras. 122.8(B) and 122.8.2(C.2)]
114.2.2 Threaded access holes with plugs, which
serve as openings for radiographic inspection of welds,
are not subject to the limitations of para. 114.2.1 and
Table 114.2.1, provided their design and installation
meets the requirement of para. 114.1. A representative
type of access hole and plug is shown in PFI ES-16.
114.2.3 Threaded connections for insertion type
instrument, control, and sampling devices are not subject
to the temperature limitation stated in para. 114.2.1 nor
the pressure limitations stated in Table 114.2.1 provided
that design and installation meet the requirements of
paras. 104.3.1 and 114.1. At temperatures greater than
925°F (495°C) or at pressures greater than 1,500 psi
(10 350 kPa), these threaded connections shall be seal
welded in accordance with para. 127.4.5. The design and
installation of insertion type instrument, control, and
sampling devices shall be adequate to withstand the
effects of the fluid characteristics, fluid flow, and
vibration.
