6
Sentry Equipment Corp
General Description
The Sentry® Saf-T-Vise STV-LP1 and Saf-T-Vise STV-LP2 Series insertable tool holders are multi-functional tools that
can be equipped to monitor pipeline corrosion, inject chemical into the process, or sample the pipeline medium . The
holders are engineered to specific site applications with a variety of materials and connection styles and sizes . Design
pressure and temperature requirements determine the model series and sealing technology of the holder .
The holders are designed with a patented locking collet which secures the rod/shaft within the process stream until
released by the operator . A process bleeder valve is standard on holders to allow depressurization of the holder after
closure of the process isolation valve . The ability to fully retract the rod/shaft out of the pipeline while under pressure
allows for pigging without bringing the line down .
The standard Saf-T-Vise STV-LP1 and Saf-T-Vise STV-LP2 Series models are designed to be inserted and retracted by
hand, without the need for a separate tool . However, the Saf-T-Vise STV-LP2 series holder comes standard with tool
threads, allowing the use of a tool for the retraction of a bent or stuck rod .
Specifications
STV-LP1
STV-LP2
weight
4 to 7 lb
1 .8 to 3 .2 kg
10 to 35 lb
4 .5 to 16 kg
materials
316 SS
316 SS;
other alloys available
insertion pressure
(MOP)
750 psi at 100°F
52 bar at 38°C
1/4 in:
1000 psi at 100°F
69 bar at 38°C
3/8 in: 750 psi at 100°F
52 bar at 38°C
1/2 in: 420 psi at 100°F
29 bar at 38°C
pressure rating
(MAP)
2000 psi at 100°F
138 bar at 38°C
4000 psi at 100°F
275 bar at 38°C
temperature rating
min/max (seals)
PTFE:
0°F / 450°F
-18°C / 232°C
PTFE:
0°F / 450°F
-18°C / 232°C
graphoil:
0°F / 1000°F
-18°C / 538°C
process connection
1 in NPT
½, ¾, 1, 1½ or 2 in NPT
or flange
insertion depth
11, 17, 23, or 29 in
28, 43, 58, or 74 cm
up to 6 ft
up to 1 .8 m
rod/shaft OD
3/8 in
1/4, 3/8 or 1/2 in
holder types
corrosion coupon, atomizer,
sample or injection quill
Installation
The Saf-T-Vise STV-LP1 and Saf-T-Vise STV-LP2 tool holders attach to a pipeline isolation valve by means of either a
flanged or NPT threaded connection . A holder is installed or removed during the operation and maintenance of the
equipment as detailed in the following sections .
Welded Stop
Rod/shaft
Lower body
assembly
Upper body
assembly
Collet
lock bolt
Manual
insertion knob
Safety
chain
Upper body
set screw
Bleeder
valve
NPT pipeline
connection
PDF Created on 7/28/2015 1:25:34 PM