NSF ANSI 41 pdf free download
NSF ANSI 41 pdf free download.Non-liquid saturated treatment systems.
4.1 Interior surfaces
Interior surfaces shall show no visible signs of structural change following performance testing and evaluation including, but not limited to, flaking, pitting, or the formation of structurally significant cracks.
4.2 Exposed surfaces
Exposed surfaces shall show no visible signs of structural change following performance testing and evaluation including, but not limited to. flaking or pitting of exposed surfaces or the formation of structurally significant cracks.
NOTE — Small surface cracks exhibited by concrete tanks are normally expected in some circumstances and shall not be considered structural deterioration.
4.3 Maintenance tools
Systems shall be supplied with all of the specialized tools required for emptying and maintaining the normal operation of the system.
4.4 Dissimilar metals
Dissimilar metal materials, considered noncompatible at the electromotive level, shall not be in direct contact with each other. An electrically nonconductive insulating fitting shall be provided at the junction between such dissimilar metal parts or components.
4.5 Impact resistance
Containers used for treatment or storage shall not break, display structurally significant cracks, or, other than cosmetic damage. display visible signs of permanent deformation when tested in accordance with 4.5.1 and
4.5.2.
All impact resistance testing shall be conducted at 23 ± 2 C (73 ± 3.5 F).
4.5.1 Impact test for horizontal surfaces of containers
A 38 mm (1.5 in) diameter steel ball weighing 0.225 kg (0.5 lb) shall be dropped from a height of 600 mm (24 in) to strike all horizontal and subhorizontal surfaces of all treatment and storage containers.6
4.5.2 Impact test for vertical surfaces of containers
All vertical surfaces of treatment and storage containers shall be subjected to a blow from a pendulum having an arm 75 cm (30 in) in length and released from an angle of 45 from the test surface. The bob shall be 11 ± 1 cm (4.3 ± 0.4 in) in diameter, be constructed of steel, and weigh 3 kg (6.6 lb).7
4.6 Burn resistance
The burn resistance test shall be conducted on each surface or sample of each surface (including all treatment and storage containers) that can hold a lighted cigarette. All test surfaces shall not ignite. progressively glow, smolder. or show evidence of being functionally impaired during or after testing in accordance with the following method.
4.7 Additives
Non-liquid saturated treatment systems shall not necessitate the use of bulking agents or chemical additives in a manner that is considered harmful to public health or the environment. The manufacturer shall provide documentation to owners and authorized representatives explaining any hazards, proper use, and proper handling of all additives.
5 Design and construction
5.1 Exposed surfaces
All exposed surfaces shall be free from nonfunctional rough or sharp edges that may cause injury to persons using, installing, maintaining, or servicing the system.
5.2 Structural integrity
After the system is installed according to the manufacturer’s instructions, all components of the system shall not break, crack or show evidence of permanent deformation during or after testing in accordance with methods described in 5.
5.2.1 Static load test
An ordinary 2 x 4 in wooden board (nominal size) shall be positioned across the center of the stool with 12 mm (0.5 in) of protective sponge rubber between the stool and the board. A weight of 136 ±2 kg (300 ±5 Ib) shall be applied equally about the centerline of the board and maintained for 15 mm. The weight and board shall then be removed, and the system shall be inspected.NSF ANSI 41 pdf download.
