General Description; Specifications; Installation - Sentry Saf-T-Vise STV-LP1 Installation, Operation & Maintenance Manual

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

weight
materials
insertion pressure
750 psi at 100°F
(MOP)
52 bar at 38°C
pressure rating 2000 psi at 100°F
(MAP)
138 bar at 38°C
PTFE:
temperature rating
min/max (seals)
process connection
11, 17, 23, or 29 in
insertion depth
28, 43, 58, or 74 cm
rod/shaft OD
holder types

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 .
6
STV-LP1 STV-LP2
4 to 7 lb 10 to 35 lb
1 .8 to 3 .2 kg 4 .5 to 16 kg
316 SS;
316 SS
other alloys available
1/4 in: 1000 psi at 100°F
3/8 in: 750 psi at 100°F
1/2 in: 420 psi at 100°F
4000 psi at 100°F
275 bar at 38°C
PTFE:
0°F / 450°F
graphoil:
-18°C / 232°C
½, ¾, 1, 1½ or 2 in NPT
1 in NPT
or flange
up to 6 ft
up to 1 .8 m
3/8 in 1/4, 3/8 or 1/2 in
corrosion coupon, atomizer,
sample or injection quill
lock bolt
Upper body
assembly
69 bar at 38°C
Lower body
52 bar at 38°C
assembly
29 bar at 38°C
0°F / 450°F
-18°C / 232°C
0°F / 1000°F
-18°C / 538°C
Collet
Rod/shaft
Manual
insertion knob
Safety
chain
Upper body
set screw
Bleeder
valve
NPT pipeline
connection
Welded Stop
Sentry Equipment Corp