RECOMMENDED SERVICE: When piping stress is critical and pipe is subject to vertical movement in excess of 1/2 inch due to thermal expansion, and also at locations where it is necessary to avoid any transfer of stress from support to support or onto critical terminals or connecting equipment.

APPROVALS: Complies with Federal Specification WW-H-1 71 E (Types 52, 58 and 59) and Manufacturers Standardization Society SP-69 (Types 54, 55 and 56). FEATURES:

- Because of exclusive geometric design, mathematically perfect constancy of support is maintained throughout the full range of load adjustment.

- Compactness - new design provides smaller and more versatile units.

• Increased load and travel capacity.

• Each hanger is individually calibrated before shipment to support the exact load specified.

• All model R Constant Supports have a wide range of load adjustability. No less than 10% of this adjustability is provided either side of the calibrated load for plus or minus field load adjustment.

• White button marked "C" denotes cold setting of hanger; red button marked "H" denotes hot or operating setting.

• Field load adjustment is made by turning the single load adjustment bolt.

• Covered spring provides protection and good appearance.

• J-rod swings at least 4' from vertical.

• Non-resonant to all vertical vibrations.

SIZE RANGE: Grinnell Model R Constant Support Hangers are made in two basic designs - the 80-V (vertical design) and the 81 -H (horizontal design). Combined, the 80-V and 81 -H Constant Supports are made in nine different frame sizes and one hundred and ten spring sizes to accommodate travels from 1 1/2" to 20" and loads from 27 pounds to 87,500 pounds.

SINGLE ROD SUSPENSION: Available in types A, B and C, Fig. 80-V (pages ph-123-125 and Fig. 81-H (pages ph-1 31-133).

HOW TO SELECT HANGER SIZE: Determine the total load to be supported by the hanger as well as the actual travel -that is, the actual vertical movement of the pipe at the point of hanger location. Refer to the Load-Travel table for Constant Support hangers (ph-1 19 to 122) and select a size hanger which will accommodate the known load and actual travel. It must be noted that the travel shown in the table is a total travel - that is, the maximum vertical movement which the hanger will accommodate. The total travel of the hanger should always be greater than the calculated travel of the pipe line to allow for some discrepancy between calculated travel and actual travel. It is suggested that the total travel for Constant Supports should be equal to ''actual travel" plus 20% and in no case less than 1 inch.

HOW TO DETERMINE DESIGN: After the size of the Constant Support is determined, consideration of available room for suspending the pipe and hanger will indicate whether a vertical ( series, see pages ph123 through 130) or horizontal (81 -H series, see pages (ph-1 31 through 136) hanger is desirable.

HOW TO DETERMINE TYPE: After the hanger size and design are determined, the type of constant support to be used depends upon the physical installation required by the suspension problem, i.e., whether the hanger is to be installed above, between or below steel members (see line cuts referring to Types A, B, C, etc.). It will be noted that the Types F and G are made in the vertical design only. Special Constant Support Hangers can be fabricated for unusual conditions.

( AND (K-HOLE DIAMETER: Tapping or drilling for standard rod size will be furnished as shown in the ( and K-hole selection charts unless otherwise specified. Upper attachments, turnbuckles and clamps should be tapped to agree with the rod as shown in the selection chart. Standard rod diameters are based on the load to be carried by the upper rod which includes the weight of the hanger assembly as well as the pipe line. Standard diameters conform to the ANSI Code for pressure piping. Other than standard sizes can be furnished when so specified. Tapped connections for hanger rod sizes 3 inch and smaller are National Coarse-Thread Series, Class 2 Fit. 31/4 inch and larger rod tappings are 8UN Series Threads.