Missouri Code of State Regulations › Title 2 - DEPARTMENT OF AGRICULTURE › Division 90 - Weights, Measures and Consumer Protection › Chapter 21 - Weighing and Measuring Devices › Section 2 CSR 90-21.030 - Requirements for Pit

Current through Register Vol. 49, No. 14, July 15, 2024
Type Scales
PURPOSE: This rule covers installation requirements
				  for pit type scales.
(1) The
				minimum pit depth, measured from the bottom of the weighbridge main beams to
				the floor of the pit, shall be twenty-four inches (24") for load cell or two
				(2) section lever-type vehicle and axle-load scales, thirty-two inches (32")
				for three (3) or more section lever-type vehicle scales, and forty-eight inches
				(48") for scales used for weighing livestock.
(2) The pit floor shall be of concrete sloped
				to a drain or sump, or both, located in close proximity to the entrance of the
				pit.
(3) One (1) opening shall be
				provided in the scale platform, pit neck covering or pit wall to provide access
				to the pit, except that two (2) openings shall be provided in the platform for
				scales with platforms longer than forty feet (40') for axle-load and vehicle
				scales.
(4) Openings in the scale
				platform or pit neck cover shall be either a circle of not less than
				twenty-four inches (24") in diameter or a square with at least twenty-two inch
				(22") sides.
(5) An entrance
				through a pit wall shall be a minimum of three feet (3') wide. The top of the
				opening shall not be lower than the bottom of the main girders and the bottom
				of the opening shall be approximately even with the floor. The center line of
				any lever extending through a pit wall opening shall be at least twenty-seven
				inches (27") from one (1) side of the opening.
(6) Main load bearing piers shall be of
				concrete poured to a depth lower than the local frost line. They shall be of
				monolithic construction with the walls or tied to the walls or floor with
				reinforcing steel. Steel perimeter coping shall be installed around the inside
				edge of the top of the pit walls. Adequate provisions shall be included in the
				pit wall to prevent damage by platform restraint devices.
(7) Approaches to Pit Type Scales.
(A) Vehicle Scales. On the entrance and exit
				ends of a vehicles scale there shall be a straight approach a) the width at
				least the width of the platform, b) the length at least one-half (1/2) the
				length of the platform, but not required to be more than forty feet (40') and
				c) not less than ten feet (10') of any approach adjacent to the platform shall
				be constructed of concrete or similar durable material to insure that this
				portion remains smooth and level and in the same plane as the platform.
				However, grating of sufficient strength to withstand all loads equal to the
				concentrated load capacity of the scale may be installed in this portion. Any
				slope in the remaining portion of the approach shall ensure ease of vehicle
				access, ease for testing purposes, and drainage away from the scale.
(B) Axle-Load Scales. At each end of an
				axle-load scale there shall be a straight paved approach in the same plane as
				the platform. The approaches shall be the same width as the platform and of
				sufficient length to insure the level positioning of vehicles during weight
				determinations.
(C) Livestock
				Scales. Approaches shall be of reinforced concrete. On at least one (1)
				entrance there shall be a ten-foot (10') approach at least as wide as the gate
				with a minimum gate width of four and one-half feet (4 1/2'), accessible for
				movement of test weights to the scale platform. This approach may be on an
				incline from the scale platform, but not such that would hamper the movement of
				test weights onto the scale platform.
1.
				Livestock scales installed prior to July 1, 1998, shall be exempt from the
				requirements of subsection (7)(C) of this rule.
(D) Railroad Track Scales. Approach rails
				must be installed in accordance with the requirements as outlined in the
AAR Scale Handbook.