§ 5.144. Hand mixing house.
(a) Floors. The floor of a hand mixing house shall be covered with linoleum, rubberoid or other suitable covering, laid either by lapping joints or by cementing their edges.
(b) Operation. The operation of every hand mixing house shall conform with the following:
(1) The maximum number of employes allowed in a mixing house is three, except when supplies are being received or finished material is being removed, when the number may be increased to five.
(2) Proper precautions shall be taken to prevent the freezing of nitroglycerin.
(3) The amount of nitroglycerin stored in a mixing house may not exceed that necessary for the next two mixes.
(4) The mixing bowl shall be made of wood (wood-lead lined) or some other suitable material.
(5) Shovels and rakes shall be made of wood.
(6) No iron or steel tools of any kind are allowed in or about a mixing house or at platforms or entrances, except in case of repairs when operations cease and explosives are removed. No iron drums shall be rolled or dragged over the floor or platform.
(7) The maximum amount of nitroglycerin in a mixing house at one time shall be 2,000 pounds.
(8) No mixed powder shall regularly remain in a mixing house overnight.
Cross References This section cited in 34 Pa. Code § 5.145 (relating to machine mixing house).
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