Table of Contents
Advertisement
Preaction 346d
The Viking Corporation, 210 N Industrial Park Drive, Hastings MI 49058
Telephone: 269-945-9501 Technical services: 877-384-5464 Fax: 269-818-1680 Email: techsvcs@vikingcorp.com
Figure 2 - Alarm Pressure switch wiring
(Al�r� ��ressure S�i��� s��ul�� be se� �� 5 ��SI (�.34 b�r)
single Interlock
Figure 3 - Air supervisory switch wiring
2. Ni�r�gen Cylin��er ��s Supply (See Figure 1.)
Nitrogen may be used in �lace of air com�ressors. Nitrogen is su��lied in �ressurized cylinders in various sizes and �ressures.
S��e �f ��e ��s� �����n �re 122 Cu. F�. �� 1��9�� ��SI (3455 L�rs. �� 131 b�r)�� 225 Cu. F�. �� 2��1�� ��SI (���372 L�rs. �� 145
b�r)�� �n�� 28� Cu. F�. �� 2��3�� ��SI (7��93� L�rs. �� 159 b�r).
When nitrogen cylinders are used as a �rimary air su��ly, s�are cylinders should be furnished and located at the valve location.
To determine the a��roximate amount of nitrogen to be furnished, the following formula may be used:
English Units
where:
�s x ��
��= ��lu�e �f Cylin��er (f�
�� =
100
�� = Require�� Ni�r�gen ��ressure (��SI)
� = ��lu�e �f Sys�e� (g�l)
Spe�i�l ���en�i�n �us� be gi�en �� sys�e�s e�pl�ying � b���le���g�s supply. Be��use �nly � li�i�e�� ���un� �f g�s is ���il�ble��
small leaks that normally would go unnoticed in systems being su��lied by mechanical com�ressors, can become critical to
��e sys�e�'s ��er�ll perf�r��n�e. If ��e sys�e� is �� fun��i�n �� �e�per��ures �s l�� �s �4� °F (�4� °C)�� �n���� if b���le�� ni�r�gen
is the gas su��ly, the system is �articularly susce�tible to leakage, and s�ecial care should be taken to ensure against leaks
throughout the entire system.
C. Air supply Installation
1. Ins��ll ��e require�� �ir supply �s ��es�ribe�� in se��i�n 4.B. ��e size �f ��e ���press�r �n�� ���un� �f �ir require�� s��ul�� be ��e-
termined in accordance with Tables 1 - 3. The air or nitrogen su��ly to the �reaction system must be clean, dry, and oil free.
2. Au�����i� �ir supplies �us� be regul��e���� res�ri��e���� �n�� fr�� � ��n�inu�us s�ur�e. A �iking �ir ��in�en�n�e ��e�i�e s��ul��
be installed on each system equi��ed with a tank-mounted com�ressor, �lant air, or nitrogen. For com�ressors with a ca�ac-
i�y less ���n 5.5 f�
an air maintenance device should not be used with riser mounted com�ressors as this can lead to com�ressor "short cycling".
�iking re����en��s ���� � ��nk���un�e�� ���press�r �i�� �ir ��in�en�n�e ��e�i�e be use��. ��is ��n be���e �ri�i��l ��en
accelerators are installed on the system.
D. Pressure switch wiring;
Wire ��e Al�r� ��ressure S�i��� (��S1�) �n�� Air Super�is�ry S�i��� (��S4�)�� �n�� ���jus� pressure se��ings �s s���n in Figures 2 � 4.
TECHNICAL DATA
Double Interlock
3
)
3
3
/�in �� 1� ��SI (�.154 �
/�in �� �.�9 b�r)�� NF��A 13 ���es n�� require �n �ir ��in�en�n�e ��e�i�e. In �����i�i�n��
6" MoDEL G-6000P PrEACTIoN
wITH ELECTrIC rELEAsE
FIELD ADJUsTMENTs:
Alarm Pressure switch: The o�erating �oint of the switch can be
���jus�e�� �� �ny p�in� be��een 4 ��SI (�.27 b�r) �n�� 8 ��SI (�.55 b�r)
by �urning ��e ���jus��en� kn�b(s) �l��k�ise �� r�ise ��e ���u��i�n
�oint or counter-clockwise to lower the actuation �oint.
Air supervisory switch: The o�erating �oint of the switches can
be ���jus�e�� �� �ny p�in� be��een 1� ��SI (�.7 b�r) �n�� �� ��SI
(4.1 b�r) by �urning ��e ���jus��en� kn�b(s) �l��k�ise �� r�ise ��e
actuation �oint or counter-clockwise to lower the actuation �oint.
��e �ig� �n�� l�� s�i���es �re ���jus�e�� in��epen��en�ly.
Figure 4 - Pressure Adjustment
Metric Units
where:
�s x ��
��= ��lu�e �f Cylin��er (L)
�� =
108
�� = Require�� Ni�r�gen ��ressure (b�r)
� = ��lu�e �f Sys�e� (L)
June 1, 2011
This can become critical when
Advertisement
Table of Contents
