3
Penberthy
SerieS N2/K2 Tubular gagecocKS
InstallatIon, operatIon and maIntenance InstructIons
3 aVaIlable MOdels
Tubular gagecock standard features are listed in
the table below:
3.1 design ratings at maximum and minimum
operating temperatures (see table 2)
To determine the maximum allowable working
pressure for a specific temperature within
the design limits stated below, the user must
refer to relevant technical data sheets or, when
provided, the specifically stated design limits on
a product proposal.
table 1
Model
n2
K2
offset pattern
X
X
integral bonnet
X
union bonnet
X
Stuffing box connection
X
X
Screwed in seat
X
integral seat
X
table 2 - desIGn ratInGs at MaxIMuM and MInIMuM OPeratInG teMPeratures
Gagecock series
Material of construction
Maximum allowable working pressure
PtFe packing
Grafoil
®
packing
N2a
K2a
carbon
675 psig [4650 kPa] at -20°F [-29°c] to 100°F [38°c]
675 psig [4650 kPa] at -20°F [-29°c] to 100°F [38°c]
steel
555 psig [3830 kPa] at 500°F [260°c]
400 psig [2760 kPa] at 750°F [399°c]
316 STS
675 psig [4650 kPa] at -300°F [-184°c] to 100°F [38°c] 675 psig [4650 kPa] at -300°F [-184°c] to 100°F [38°c]
555 psig [3830 kPa] at 500°F [260°c]
400 psig [2760 kPa] at 750°F [399°c]
N2b
N2c
K2b
K2c
carbon
750 psig [5170 kPa] at -20°F [-29°c] to 100°F [38°c]
750 psig [5170 kPa] at -20°F [-29°c] to 100°F [38°c]
steel
610 psig [4210 kPa] at 500°F [260°c]
450 psig [3100 kPa] at 750°F [399°c]
316 STS
750 psig [5170 kPa] at -300°F [-184°c] to 100°F [38°c] 750 psig [5170 kPa] at -300°F [-184°c] to 100°F [38°c]
610 psig [4210 kPa] at 500°F [260°c]
450 psig [3100 kPa] at 750°F [399°c]
Pressure/temperature ranges in the table above are subject to the limitations of the tubular glass.
See Table 3 below.
table 3 - tubular glass - ratings ⅝" (16 mm) and ¾" (19 mm) Od
Center to center distance for vessel
connections
Inches [mm]
no corrosion up to 150°F [66°C]
steam boiler service up to 425°F [218°C]
high pressure
heavy wall
red line
high pressure
heavy wall
red line
psig (kPa)
psig (kPa)
10 [254]
410 [2830]
600 [4140]
340 [2340]
310 [2140]
345 [2380]
275 [1900]
15 [381]
385 [2650]
600 [4140]
310 [2140]
280 [1930]
325 [2240]
265 [1830]
20 [508]
355 [2450]
600 [4140]
285 [1960]
265 [1830]
315 [2170]
260 [1790]
25 [635]
300 [2070]
580 [4000]
260 [1790]
250 [1720]
300 [2070]
250 [1720]
30 [762]
275 [1900]
550 [3790]
230 [1590]
35 [889]
240 [1650]
500 [3450]
200 [1380]
40 [1016]
210 [1450]
420 [2890]
180 [1240]
45 [1143]
200 [1380]
360 [2480]
170 [1170]
50 [1270]
180 [1240]
340 [2340]
160 [1100]
Not recommended
55 [1397]
150 [1030]
N/a
140 [970]
60 [1524]
140 [970]
N/a
120 [830]
65 [1651]
125 [860]
N/a
100 [690]
70 [1778]
100 [690]
N/a
90 [620]
N/a - Not available
warnInG
NEVER exceed these design ratings or application
data. Exceeding design ratings or
application data may result in mechanical failure
of gagecock components resulting in serious
personal injury or property damage.
3.2 steam application
Penberthy series N2 and K2 gagecocks are
designed for process conditions. in low pressure
steam/water applications (< 350 psig [2410 kPa]
at 434°F [223°c], the use of N2 and K2 series
gagecocks is allowed because the potential
mechanical stress imposed on the gagecock
assembly by the thermodynamic steam
environment is relatively small.
