4.2Piping ST 3000 Transmitter, Continued

Piping Arrangements,

 

Another piping arrangement uses a block-off valve and a tee connector in

continued

 

the process piping to the transmitter as shown in Figure 12.

 

Figure 12

Typical Arrangement for ½” NPT Process Connection Piping

 

 

 

 

 

 

 

 

 

 

Tank Wall

 

 

 

 

 

 

1/2" NPT

 

 

 

 

 

 

 

 

 

 

 

 

Connection

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Block-off Valve

Transmitter location

 

 

 

Table 11 lists the mounting location for the transmitter depending on

 

 

 

 

 

 

the process.

 

 

 

 

 

 

Table 11

Suggested Transmitter Location for Given Process

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Process

Suggested Location

Explanation

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Gases

Above the gas line

The condensate drains away from

 

 

 

 

 

 

 

 

 

the transmitter.

 

 

 

 

 

 

 

Liquids

1. Below but close to the

1. This minimizes the static head

 

 

 

 

 

 

 

 

elevation of the process

effect of the condensate.

 

 

 

 

 

 

 

 

connection.

 

 

 

 

 

 

 

 

 

 

2. Level with or above the

2. This requires a siphon to

 

 

 

 

 

 

 

 

process connection.

protect the transmitter from

 

 

 

 

 

 

 

 

 

process steam. The siphon

 

 

 

 

 

 

 

 

 

retains water as a “fill fluid.”

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

For liquid or steam, the piping should slope a minimum of 25.4 mm

 

ATTENTION

 

 

 

 

 

 

 

 

 

 

(1 inch) per 305 mm (1 foot). Slope the piping down towards the

 

 

 

 

 

 

transmitter if the transmitter is below the process connection so the

 

 

 

 

 

 

bubbles may rise back into the piping through the liquid. If the

 

 

 

 

 

 

transmitter is located above the process connection, the piping should

 

 

 

 

 

 

rise vertically above the transmitter; then slope down towards the

 

 

 

 

 

 

flowline with a vent valve at the high point. For gas measurement, use a

 

 

 

 

 

 

condensate leg and drain at the low point (freeze protection may be

 

 

 

 

 

 

required here).

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Continued on next page

2/05

ST 3000 Release 300 Installation Guide

35