Spirax Sarco MST21 Series Manuel utilisateur

INSTALLATION AND MAINTENANCE INSTRUCTIONS

IM-2-00021-US April 2014

MST21 Series Thermostatic Steam Trap

Maximum Working Conditions

305 psig @572º F (21 barg @300º C)

Installation

1. Install strainer optional and isolation valve upstream of trap if draining to grade and both sides if

discharging into return system.

2. Never weld pipe connections to the trap, damage to the thermostatic capsule could result.

3. For freeze protection all drain lines must be pitched toward the trap for gravity ow. Trap must be

installed vertically discharging downward and discharge piping must be self-draining.

4. When used as a thermostatic air vent, the arrow pointed upwards. Locate at high point of main or

equipment, where air can collect and pipe discharge to a drain.

5. Always drain to a safe place.

Maintenance

1. Make sure all steam is turned off and pressure has been

dissipated before doing any work.

2. Remove cap (2) using a wrench.

3. Lift out the strainer screen (6), Spring (4), thermostat cap-

sule (3), and spacer plate (5).

4. Replace with new internals in the correct order. Make sure

the conical spring (4) is positioned with the narrow end in

contact with the capsule.

5. Fit a new gasket (7)

6. Ret the cap (2) using a little anti-seize compound on the

threads and tighten to the recommended torque (see table).

Size Lbf ft Nm

1/4” 73-80 100-110

3/8” 73-80 100-110

1/2” 73-80 100-110

3/4” 73-80 100-110

1” 73-80 100-110

Recommended Tightening Torques

Recommended for critical applications,

such as draining steam mains, tracing

lines, sterilizers and steam air venting.

Make sure trap is mounted in direction

of ow.

Spare Parts

• Complete internal set 3,4,5,6,7.

• Gasket Kit (set of 3) 7.

Note: Must choose either STD, NTS, or

Sub capsule.

Steam Supply

Valve

Strainer

(Optional)

MST21 Trap

Steam Supply

Valve

Strainer MST21 Trap

VERTICAL PIPING

INSTALLATION

HORIZONTAL PIPING

INSTALLATION

For any additional information you may require, contact: Spirax Sarco

Applications Engineering Department

Toll Free 1-800-883-4411

SPIRAX SARCO, INC. • 1150 NORTHPOINT BLVD. • BLYTHEWOOD, SC 29016

1-800-883-4411

WWW.SPIRAXSARCO.COM/GLOBAL/US

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